Why Exercise Heals Your Pain (Even When You’re Not Getting Stronger)

PHYSIO MOSMAN: https://www.fitasaphysio.com/

This editorial challenges the traditional belief that muscle strength gains are the primary reason exercise relieves musculoskeletal pain. While physical activity is highly effective for recovery, current research suggests that biomechanical changes often fail to explain why patients feel better. Instead, the authors highlight biopsychosocial factors, such as increased confidence, reduced fear of movement, and improved biochemical balance, as more likely drivers of improvement. They urge clinicians to move beyond simplistic strength-based narratives to avoid demoralizing patients who do not see physical gains. Ultimately, while strength remains vital for general health, the sources emphasize that the mind-body connection and the therapeutic relationship are more central to pain rehabilitation.

READ MORE: https://www.fitasaphysio.com/blog/strength-in-musculoskeletal-pain-rehabilitation

Transcript

SPEAKER_01 0:13

You know, when you stop and think about it, um, how we navigate the world, it is almost entirely through this like lens of engineering.

SPEAKER_00 0:21

Yeah, completely.

SPEAKER_01 0:22

Like we are surrounded by machines and we just inherently understand how they work. It's a worldview based on uh precision.

SPEAKER_00 0:30

Aaron Powell Right, inputs and outputs.

SPEAKER_01 0:32

Exactly. It's like taking your car to the mechanic because there's this strange rhythmic knocking noise under the hood. You don't ask the mechanic to assess the car's emotional state.

SPEAKER_00 0:44

No, you would think they're crazy.

SPEAKER_01 0:45

Right. You don't ask about its relationship with the highway. The mechanic just listens and they say, ah, that is the serpentine belt.

SPEAKER_00 0:52

And then they replace the physical belt.

SPEAKER_01 0:53

Yeah, and the noise is just completely gone. It's incredibly clean. It's a binary system, you know. Broken or not broken, loose or tight.

SPEAKER_00 1:01

Aaron Powell It is deeply comforting, isn't it? I mean, as human beings, we naturally gravitate toward things that are uh visible, physical, and just easily categorized. For sure. And for the last few hundred years, really ever since the Industrial Revolution, we have essentially mapped that exact same mechanical framework onto the human body. We view ourselves as, well, complex meat machines.

SPEAKER_01 1:26

Complex meat machines, yeah. And for a lot of medical interventions, that actually makes perfect sense. Oh, absolutely. Like if you break your arm, a doctor sets the bone. If you have a ruptured appendix, a surgeon goes in and removes it. But then um you step into the world of physical therapy and musculoskeletal pain and rehabilitation, and suddenly that really neat, clean, mechanical worldview just it starts to fracture.

SPEAKER_00 1:51

It really falls apart.

SPEAKER_01 1:52

It does. We enter this diagnostic and treatment landscape that is honestly incredibly murky, yet we still cling to that machine metaphor.

SPEAKER_00 2:00

We do, yeah.

SPEAKER_01 2:01

We are so used to the idea that a joint is just a hinge. If a pulley is loose, you tighten it. If a muscle is weak, you strengthen it, and logically the pain should just go away.

SPEAKER_00 2:09

It is the absolute definition of diagnostic muddy waters. Yeah. And what is so fascinating about this specific corner of medicine is that, well, for decades, the medical community, physical therapists, and patients have all been operating under this shared illusion.

SPEAKER_01 2:26

An illusion that feels completely real.

SPEAKER_00 2:29

Exactly. A very persistent, very logical sounding illusion that feels so right that nobody ever really stopped to question the foundational mechanics of it.

SPEAKER_01 2:38

Which brings us to our mission for this deep dive. We are jumping into a really groundbreaking 2026 editorial published in the British Journal of Sports Medicine.

SPEAKER_00 2:47

It's a fantastic piece of literature.

SPEAKER_01 2:48

It really is. It was spearheaded by Jared Powell and this incredible team of colleagues, including Leanne Wood, Aidan Gregory Cashin, and Jeremy S. Lewis. And I have to tell you, they are essentially taking a sledgehammer to one of the most universally accepted, unquestioned beliefs in all of sports medicine and rehabilitation.

SPEAKER_00 3:05

They really are.

SPEAKER_01 3:06

Okay, let's unpack this. If you, our listener, have ever been to a physical therapist for, say, a bad knee, a cranky shoulder, or an aching lower back, you have unnatedly been told some variation of a very specific phrase, which is you need to get stronger.

SPEAKER_00 3:23

It is the ubiquitous mantra of rehabilitation, isn't it? Yeah. It's the core philosophy that drives literally millions of clinical interactions every single day. Trevor Burrus, Jr.

SPEAKER_01 3:32

Right. It's the uh the colored resistance bands, it's the light dumbbells. The therapist tells you, hey, your rotator cuff is weak, which is why your shoulder hurts. So do these internal and external rotation exercises to get stronger, the joint will be supported and the pain will diminish.

SPEAKER_00 3:46

The logic just feels completely sound.

SPEAKER_01 3:48

Aaron Ross Powell It's such an intuitive assumption. But this editorial, which is titled, It Is Not All About Strength, rethinking mechanistic assumptions and exercise-based rehabilitation for musculoskeletal pain relief, it takes a step back, looks at decades of data, and shows us that there is a massive chasm between what we believe is happening biomechanically and what the scientific data actually proves.

SPEAKER_00 4:08

Aaron Powell A massive chasm.

SPEAKER_01 4:10

The long-held belief that your pain goes away specifically because your muscle got stronger, the data says that is fundamentally flawed.

SPEAKER_00 4:17

It really is a paradigm shifting paper.

SPEAKER_01 4:19

Yeah.

SPEAKER_00 4:20

Because I want to be absolutely clear right from the start here, so we don't cause any undue panic for anyone listening.

SPEAKER_01 4:26

Good idea.

SPEAKER_00 4:27

Exercise does work. The authors are not saying physical therapy is a sham or you know that you should stop going to the gym. Exercise remains the foremost absolute gold standard treatment recommendation for a whole host of musculoskeletal or MSK pain conditions.

SPEAKER_01 4:43

And we are talking about the big ones here, the conditions that sideline millions of people that keep you from picking up your kids or running that 5K, or honestly, just sleeping through the night.

SPEAKER_00 4:53

Right, the everyday debilitating issues.

SPEAKER_01 4:55

Yeah. The paper specifically addresses rotator cuff-related shoulder pain, Achilles tendinopathy, patellar tendinopathy, which most people know as jumpers, knee musculoskeletal, low back pain, and osteoarthritis, specifically of the knee and the hip.

SPEAKER_00 5:09

Exactly. For all of these incredibly common, incredibly frustrating conditions, exercise therapy is consistently proven to be effective. Patients do the exercises, their pain goes down, and their daily function improves. So it works. It does. The treatment on a surface level is a resounding success. But what this editorial brilliantly exposes is that the mechanism of why it works has been entirely misunderstood by almost everyone involved.

SPEAKER_01 5:37

Okay, I want to pause here because we are going to be using the word mechanism a lot today, and it's kind of the crux of this entire deep dive. Yes. When we talk about a mechanism in this context, we're talking about the how and the why, correct? Not just the end result.

SPEAKER_00 5:51

Precisely. The authors use the phrase mechanistic assumption. You know, in science, and particularly in medicine, it is not enough to just know that event A leads to outcome B.

SPEAKER_01 6:01

You need the connecting tissue.

SPEAKER_00 6:02

Right. We have to know the exact pathway of how event A leads to outcome B. But for a very long time, the medical community has relied on implicit, heavily biomechanical beliefs to explain this mechanism.

SPEAKER_01 6:13

Why do you think that is?

SPEAKER_00 6:14

Well, mainly because of what the authors astutely call its intuitive logic and communicative simplicity.

SPEAKER_01 6:21

Oh, that makes sense.

SPEAKER_00 6:22

It is remarkably easy for a busy clinician to explain to a patient, hey, your knee hurts because your quadriceps are weak. We will do squats to make them strong. The knee will be supported and it will stop hurting.

SPEAKER_01 6:34

Right. It's a very clean story. But if we go back to my car analogy for a second, it's like taking your car to the mechanic because of that strange engine knocking noise. The mechanic looks at it and for some reason decides to change your tires.

SPEAKER_00 6:47

Very strange mechanic.

SPEAKER_01 6:49

Yeah. But then you drive away and miraculously the engine knocking is completely gone. Right. For years, the medical community has been like patting itself on the back, assuming the new tires somehow reached up and fixed the engine valves. We got the right outcome. A quiet car. But our explanation for why it happened is just completely detached from reality.

SPEAKER_00 7:09

That's a great way to put it.

SPEAKER_01 7:10

The data is now telling us the tires didn't fix the engine. Something else did entirely.

SPEAKER_00 7:15

What's fascinating here is that um we didn't always have the tools to measure this accurately. But as the evidence base has grown, our ability to track and measure exact isolated changes in the human body has improved exponentially.

SPEAKER_01 7:30

We can see so much more now.

SPEAKER_00 7:31

We can. And when researchers actually look for that targeted increase in strength like, when they measure it, quantify the force output, and map it against the patient's corresponding drop in pain, the connection simply isn't there.

unknown 7:45

Wow.

SPEAKER_00 7:46

The physical strength gains do not mediate the clinical improvements in pain.

SPEAKER_01 7:50

That word mediate is really where the rubber meets the road. I want to really dive into the evidence here because honestly, I was blown away by the sheer volume of data the authors brought to the table to dismantle this strength myth.

SPEAKER_00 8:02

Very comprehensive.

SPEAKER_01 8:03

The paper relies heavily on a statistical method called a causal mediation analysis. Now, before we look at the specific body parts, can you explain the architecture of that kind of analysis? Because it sounds incredibly complex, but it's really the key to unlocking this whole mystery.

SPEAKER_00 8:17

I'd be happy to. And it's actually quite elegant once you break it down. Let's use a geographical analogy.

SPEAKER_01 8:23

Like analogies.

SPEAKER_00 8:23

Imagine you live in City A, which is chronic pain, and you want to travel to City B, which is pain relief. The vehicle you were driving to get there is an exercise program.

SPEAKER_01 8:33

Got it. City A to City B in my exercise car.

SPEAKER_00 8:36

Now, we know for a fact that people get in their cars and successfully drive from City A to City B all the time. But there's a massive river between the two cities. And for decades, the medical community assumed that the only way across that river was a specific bridge called increased muscle strength.

SPEAKER_01 8:54

We just assumed every single car drove over that specific bridge.

SPEAKER_00 8:58

Exactly. Because it's the biggest, most obvious bridge. A causal mediation analysis is basically a highly rigorous mathematical way of checking the traffic cameras on that bridge.

SPEAKER_01 9:08

Oh, it's brilliant.

SPEAKER_00 9:09

It isolates the variables to test whether the vehicle actually took that specific route. It asks, did the exercise program reduce the pain specifically through the pathway of increasing muscle force?

SPEAKER_01 9:20

And what are the traffic cameras showing?

SPEAKER_00 9:21

Well, what these researchers are finding across multiple conditions is that the increased muscle strength bridge is practically empty. The cars are getting to City B, but they are using completely different hidden routes.

SPEAKER_01 9:34

And the findings are just shocking. Let's walk through the specific studies they highlight in the paper and let's group these because it's not just one type of joint.

SPEAKER_00 9:41

Good idea.

SPEAKER_01 9:42

Let's start with the heavy load-bearing tendons like the Achilles. Anyone who runs or plays court sports knows how nagging and persistent Achilles tendinopathy can be.

SPEAKER_00 9:52

It's notoriously difficult to rehab.

SPEAKER_01 9:54

Right. And the standard physical therapy protocol usually involves months of heavy, eccentric calf raises, like loading the tendon with heavy weight. The assumption is that we are changing the actual structure of the tissue. So what did the traffic cameras on that bridge actually show?

SPEAKER_00 10:11

The authors point to a very comprehensive systematic review, looking specifically at Achilles' tendinopathy rehabilitation. And they found absolutely zero evidence linking improvements in a patient's pain or disability scores with actual physical changes in either the structure of the muscle tendon unit or its physical force output.

SPEAKER_01 10:30

Wait, zero evidence.

SPEAKER_00 10:32

Zero. Let that sink in. Patients diligently did their heavy calf raises. They felt significantly better. They got back to running, and their disability scores plummeted.

SPEAKER_01 10:42

Which is great.

SPEAKER_00 10:43

It is. But when the researchers used imaging and force plates to measure the physical structure of the triceps C-rae, the calf muscle, and its maximum strength, there was no statistical relationship to the pain relief. The physical tissue did not have to get measurably stronger or thicker for the pain to disappear.

SPEAKER_01 10:59

Okay, I have to admit, my initial reaction to that is just skepticism. I mean, maybe the Achilles is just this weird vascular piece of tissue that behaves differently than other parts of the body. What about the knee? They looked at patellar tendinopathy as well, right?

SPEAKER_00 11:11

They did. And they found the exact same phenomenon. Another study utilized that specific causal mediation analysis on athletes suffering from patellar tendonopathy who were undergoing a progressive tendon loading regime, you know, heavy squats, leg extensions.

SPEAKER_01 11:26

Standard heavy leg day stuff.

SPEAKER_00 11:27

Right. And the athletes clinically improved. Their pain went down. But the statistical analysis showed that the beneficial effect was not mediated through improvements in quadricep strength.

SPEAKER_01 11:37

Really?

SPEAKER_00 11:38

Yes. The quads, physically generating more force, did not explain why the tendon in the knees stopped hurting. The strength bridge was empty again.

SPEAKER_01 11:46

That is wild. Okay, so that's the heavy load-bearing tendons, but what about the complex stabilizing joints like the shoulder, specifically the rotator cuff?

SPEAKER_00 11:56

Ah, the rotator cuff.

SPEAKER_01 11:57

I mean, rotator cuff physical therapy is practically an entire global industry built entirely on the concept of strengthening. You have a massive shoulder joint held together by these tiny, delicate, stabilizing muscles. The logic is so sound, the muscles are weak, the arm bone rattles around in the socket and pinches a nerve, so you strengthen the tiny muscles to hold the bone in place. How can that possibly be wrong?

SPEAKER_00 12:22

It sounds perfectly logical, I know. But again, the human body isn't just a simple pulley system. The editorial fikes multiple robust studies showing no evidence casually connecting changes in physical strength for rotator cuff-related shoulder pain to improvements in the patient's pain outcomes.

SPEAKER_01 12:37

So I can do those little exercises and get better, but not because I got stronger.

SPEAKER_00 12:41

Exactly. You can do the banded internal rotations every day for 12 weeks. Your pain can entirely go away. But when they isolate and test the actual torque and force production of your supraspinitis or infraspinitis muscles, the increase in their physical strength is not the thing that caused the pain reduction. The mechanism simply isn't there.

SPEAKER_01 13:00

I am genuinely struggling to let go of this biomechanical safety blanket. It just makes so much sense in my head.

SPEAKER_00 13:06

It's hard to unlearn.

SPEAKER_01 13:07

Let's look at one more before we get to the really crazy statistic. Patele femoral pain, that generalized aching pain at the front of the knee, which is super common in runners. The modern cutting-edge protocol there isn't even to treat the knee, it's to strengthen the hips, right?

SPEAKER_00 13:24

Yes, exactly.

SPEAKER_01 13:24

You build up the glutes so your knee doesn't cave inward when you run.

SPEAKER_00 13:28

Right. That's the valgus collapse theory. The biomechanical narrative there is that weak hip abductors allow the femur to internally rotate, which misaligns the kneecap and causes pain. Therefore, you strengthen the hips to fix the knee. Makes total sense. But a secondary mediation analysis examined this exact protocol. They found that while hip resistance exercises did indeed have a beneficial effect on the patient's knee pain, actual measured improvements in hip muscle strength did not explain that benefit. Wow. The patients felt better, but not because their glutes were physically producing more raw wattage.

SPEAKER_01 14:04

Okay, it's really starting to see the pattern here. But the absolute showstopper in this paper, um, the statistic that literally made me stop reading, put my notes down, and just stare at the wall, is the data on knee osteoarthritis.

SPEAKER_00 14:18

It is incredibly striking.

SPEAKER_01 14:19

Osteoarthritis. This is the classic wear and tear disease. We are told our cartilage is wearing away, we are going bone on bone, and we desperately need to build massive, strong muscles to act as shock absorbers to protect the degenerating joint.

SPEAKER_00 14:34

That's the standard narrative, yes.

SPEAKER_01 14:35

If there was ever a condition where pure mechanical strength should be the absolute savior, it's knee osteoarthritis. Break down this specific study for us because the numbers are just staggering.

SPEAKER_00 14:46

I agree. This is really the centerpiece of their argument. The authors cite an individual participant data meta-analysis looking at the effects of exercise on knee osteoarthritis. Now, I want to clarify why this specific type of study is so powerful. Please do. Usually a meta-analysis just aggregates the published summaries of other trials. But an individual participant data meta-analysis means the researchers went back, gathered the raw line-by-line data from thousands of individual patients across multiple different trials, standardized all that raw data, and ran the complex math themselves from scratch.

SPEAKER_01 15:22

Wow. So they went right to the source code. It leaves nowhere for bad data to hide.

SPEAKER_00 15:26

Exactly. It is the absolute gold standard of statistical rigor. And when they ran this massive causal mediation analysis, they found that knee extension strength, meaning the actual physical increase in the force produced by getting the quadriceps stronger, it mediated approximately 2% of the treatment effect of therapeutic exercise.

SPEAKER_01 15:46

2%. Let's just sit with that for a second. 2%.

SPEAKER_00 15:48

It's almost nothing.

SPEAKER_01 15:49

If I am a patient with severe knee osteoarthritis and I commit to a grueling 12-week therapeutic exercise program, and at the end of it, my pain has gone down significantly. The actual physical strengthening of my leg muscles only accounts for 2% of that pain relief.

SPEAKER_00 16:05

That's what the data shows.

SPEAKER_01 16:06

If strength is only doing 2% of the heavy lifting, what on earth is doing the other 98%?

SPEAKER_00 16:12

And that is the exact pivotal question this editorial is forcing the entire medical and rehabilitation community to confront, as the authors state beautifully in the text. Across conditions, the conclusion is similar. Exercise therapy is modestly effective, but rarely because people get stronger.

SPEAKER_01 16:31

They write, the chasm between belief and data warrants attention.

SPEAKER_00 16:36

Right.

SPEAKER_01 16:36

That is such a polite, deeply academic way of saying we have been telling millions of people the wrong story about their own bodies for 50 years, and we desperately need to figure out what is actually happening.

SPEAKER_00 16:47

It's a very polite wake-up call.

SPEAKER_01 16:49

But let me push back here for a minute. I'm gonna play devil's advocate on behalf of the listener because I know exactly what someone driving in their car right now is thinking.

SPEAKER_00 16:56

Go for it.

SPEAKER_01 16:57

Let's say I'm a patient. I go to the clinic with terrible, debilitating back pain. The therapist gives me deadlifts and squats. I do them diligently. Three months later, I can pick up my toddler without wincing, honestly. Why should I, or even the medical field, care if my recovery was because my spinal erector muscles got physically thicker or because of some mysterious 98% unknown factor? The pain is gone. A win is a win, right? Why does the specific mechanism actually matter outside of like a dry academic textbook?

SPEAKER_00 17:30

This raises an important question, and it is a tension that clinicians face in the trenches every single day. You know, why not just embrace the misunderstanding or even a placebo if it gets the patient back to their life?

SPEAKER_01 17:40

Exactly.

SPEAKER_00 17:41

The authors anticipate this exact pragmatic pushback and they systematically deconstruct it. They outline three critical pillars explaining why mechanisms deeply, profoundly matter: scientific rigor, clinical integrity, and responsible research.

SPEAKER_01 17:55

Okay, let's take those one by one, starting with scientific rigor.

SPEAKER_00 17:57

Right. In the health sciences, if you want to make a robust, defensible, causal claim saying treatment X directly causes outcome Y, you need more than just statistical correlation.

SPEAKER_01 18:09

Right. Correlation isn't causation.

SPEAKER_00 18:11

Exactly. You can't just observe that people who lift weights report feeling better and call it a day. You must integrate that probabilistic evidence with concrete mechanistic evidence. You have to prove the pathway.

SPEAKER_01 18:23

You have to find the bridge.

SPEAKER_00 18:25

Yes. Without a valid proven mechanism, your causal claims are, in the exact words of the authors, shallow and unstable. If we build international clinical guidelines on shallow claims, the entire foundation of evidence-based medicine is compromised. We end up prescribing treatments out of tradition and dogma rather than biological truth.

SPEAKER_01 18:45

Okay, I can see why a researcher in a lab cares about that. You don't want the medical establishment built on a house of cards. But what about the second pillar? Clinical integrity. This one feels deeply personal to the actual human being experiencing the pain.

SPEAKER_00 18:57

It is deeply personal and arguably the most vital point in the entire paper. The mechanistic narratives we use, the literal stories that doctors and therapists tell patients about their bodies shape exactly how patients understand their own physical identity.

SPEAKER_01 19:12

Okay, so if a physical therapist tells me your lower back hurts because your core is incredibly withic and you must get stronger to fix it, what is the actual danger there?

SPEAKER_00 19:22

The danger is immense and it happens every day. First, consider the psychological risk of tying their self-worth to a physical metric. If you emphasize strength as the primary pass or fail treatment target, you risk completely demoralizing patients who do not physically improve along that specific metric.

SPEAKER_01 19:40

Oh, I see.

SPEAKER_00 19:40

Imagine a patient who exercises diligently for 12 weeks. Their pain actually improves a bit, they are sleeping better, they can walk further, but when the therapist tests their core strength or their one rep max, the dials haven't moved.

SPEAKER_01 19:53

They haven't added any weight to the bar.

SPEAKER_00 19:55

Right. If that patient firmly believes strength is the only cure, they will view themselves as a catastrophic failure. They will believe their condition is untreatable, even if they are functionally doing better in their daily life.

SPEAKER_01 20:08

Wow. So by setting measurable strength as the ultimate finish line, we are setting up a massive portion of the population to feel fundamentally broken even when the therapy is technically working.

SPEAKER_00 20:18

Exactly.

SPEAKER_01 20:18

And the paper also mentions that this rigid strength narrative constrains the clinician's ability to adapt. What do they mean by that?

SPEAKER_00 20:26

Well, um, if the only medically accepted goal is maximum strength hypertrophy, the clinician might feel obligated to force a patient to do heavy painful weightlifting in a sterile gym environment, which the patient might absolutely hate.

SPEAKER_01 20:39

Yeah. Not everyone is a gym rat.

SPEAKER_00 20:41

But if the goal is something else, which we will get to shortly, the clinician has the professional freedom to say, you hate the gym, no problem, let's go swimming, or do Tai Chi or brisk walking in the park. Because if sheer mechanical strength isn't the magic ingredient for pain relief, the menu of viable, enjoyable exercises expands massively.

SPEAKER_01 21:00

That makes total sense. And there is a darker, almost insidious side to clinical integrity mentioned here too. The authors write that the strength narrative can reinforce inaccurate structural beliefs and protective behaviors about weakness or fragility causing pain. This concept is terrifying to me.

SPEAKER_00 21:18

It should be. It touches on what we call in medicine a nocebo effect, the evil twin of the placebo effect. Right. When a trusted medical professional looks at an MRI or a movement screen and tells a patient your shoulder is weak or your spine lacks structural support, the patient internalizes the belief that they're fundamentally fragile. They picture their spine like a stack of teacups ready to shatter.

SPEAKER_01 21:42

Right. They think they are one bad movement away from a wheelchair.

SPEAKER_00 21:45

Exactly. And what does a human being do when they feel fragile? They start to structurally guard themselves. They move stiffly, they brace their core constantly. They avoid picking up their grandchildren. They stop playing tennis.

SPEAKER_01 21:56

They just shrink their lives.

SPEAKER_00 21:58

They do. They develop an Intense localized fear of their own body. And ironically, beautifully, tragically, that protective muscular guarding, that constant bracing and belief in their own structural deficiency, restricts blood flow, heightens nervous system sensitivity, and actually amplifies their experience of pain.

SPEAKER_01 22:18

Oh my God.

SPEAKER_00 22:19

We create the exact disability we are trying to cure simply through the words we choose.

SPEAKER_01 22:25

That is profound. We are literally talking about the physiological neurological damage caused by a sloppy biomechanical metaphor. Yes. Okay. And the third pillar was responsible research. I assume this means if we are studying the wrong mechanism, we are just throwing grant money into a black hole.

SPEAKER_00 22:40

Precisely. If we don't understand the why, we completely miss out on designing more efficient targeted treatments. If millions of dollars in clinical trials only ever measure two things, did the pain score go down? Yeah and did the muscle get bigger, we remain completely blind to the actual mechanisms driving the recovery. We have to design trials that illuminate the black box of rehabilitation so we can optimize the interventions. If strength is only 2%, we need research dollars finding the 98%.

SPEAKER_01 23:08

Okay, so we've torn down the old house. The biomechanical stronger equals less pain myth has been thoroughly and meticulously deconstructed. We know that the wreckage of that myth is actually dangerous to patients because it makes them feel inherently fragile. The obvious burning question now is what are we building in its place?

SPEAKER_00 23:27

The new paradigm.

SPEAKER_01 23:28

Right. If I have terrible knee arthritis and my quad strength only accounts for a measly 2% of the pain relief I get from doing my exercises, what on earth is the other 98%?

SPEAKER_00 23:39

Here's where we undergo a massive paradigm shift in how we view the human body. The authors introduce us to a constellation of what they call biopsychosocial mechanisms.

SPEAKER_01 23:48

Biopsychosocial, that's a mouthful.

SPEAKER_00 23:50

It is, but it's crucial. And they provide a truly fantastic visual aid in the paper Figure One, which maps out how exercise actually contributes to a reduction in musculoskeletal pain.

SPEAKER_01 24:01

Here's where it gets really interesting. If you picture the current cutting-edge model of pain science presented in this paper, it actually looks like a target or a wheel. Right in the very center, the bullseye is the ultimate goal we all want, which is reduction in pain through exercise.

SPEAKER_00 24:19

The core objective.

SPEAKER_01 24:20

Right. Surrounding that bullseye are five inner wedges. These are the actual mechanisms, the new bridges across the river we were talking about earlier. And encompassing all of this is an outer ring, a vital environment of contextual factors that make the whole system work. That outer ring is made of four things goals, values, preferences, and the therapeutic relationship.

SPEAKER_00 24:41

It's a beautiful, holistic model because it entirely contextualizes the physical act of exercise within the lived human experience. It admits that you cannot separate the biomechanics of a squat or a bicep curl from the psychology of the person doing it, the stress of their environment, or their relationship with the therapist guiding them.

SPEAKER_01 24:58

It's all connected. Let's systematically unpack the inner wedges of this diagram, the alternative mechanisms that these rigorous mediation analyses have actually proven to work. Let's do it. The text highlights four major categories. Let's start with a big one, which sounds purely psychological, but obviously has massive physical ramifications, and that is pain, self-efficacy, beliefs, and catastrophizing.

SPEAKER_00 25:22

This is a monumental shift in how we view rehabilitation. The evidence strongly shows that altering a patient's underlying beliefs about their pain and specifically reducing their tendency to catastrophize is a massive mediator for improving physical function and reducing perceived pain. Wow. This has been validated across highly debilitating conditions like osteoarthritis and chronic low back pain.

SPEAKER_01 25:46

Catastrophizing is such a powerful evocative word. It's that 3.00 AM spiral, right? Like my back twinched today, therefore I have a slip disc, therefore I won't be able to work, therefore I'll lose my house, therefore my life is over.

SPEAKER_00 25:57

Exactly. It is a psychological amplifier for physical pain. And what exercise does, quite brilliantly, is it provides undeniable physical evidence that contradicts the catastrophe. Well, let's imagine a patient with chronic back pain who is terrified of bending over. When a skilled therapist guides them to manage a set of modified deadlifts or picking a kettlebell off the floor, that patient isn't necessarily building new, thicker muscle fibers that day.

SPEAKER_01 26:23

Right. It takes weeks to build muscle.

SPEAKER_00 26:24

Exactly. The structural strength hasn't changed, but they're building massive amounts of pain, self-efficacy. They are proving to their deeply panicked nervous system, look, I can move, I can lube my spine with weight, and my body does not shatter.

SPEAKER_01 26:37

They are rewriting the software of the nervous system rather than upgrading the hardware of the muscle.

SPEAKER_00 26:43

Perfectly said. The internal narrative shifts from I am damaged and fragile to I am robust and capable of recovery. And we know from neurobiology that this psychological shift dramatically turns down the volume dial on the nervous system's pain output. The brain stops sending the alarm signal because it no longer perceives a threat.

SPEAKER_01 27:03

Okay. The next wedge in the diagram is fascinating because it proves we aren't just talking about psychology here. It's not just, you know, think happy thoughts and your knee will heal. This is deeply physiological. The paper lists inflammatory biomarkers.

SPEAKER_00 27:17

Yes, this is the bile in biopsychosocial. The text highlights a fascinating study on knee osteoarthritis. It showed that the improvements in pain and function achieved through a diet and exercise program were heavily mediated by reductions in inflammatory biomarkers circulating in the blood and joint fluid.

SPEAKER_01 27:34

So the chemistry actually changes.

SPEAKER_00 27:35

Yes. We need to stop thinking of exercise as just a mechanical tightening of pulleys and levers and start thinking of it as a systemic biochemical intervention.

SPEAKER_01 27:44

So improved biochemical homeostasis. It's like imagine the knee joint is sitting in a bowl of soup.

SPEAKER_00 27:50

Okay.

SPEAKER_01 27:50

When the knee is severely arthritic and painful, that soup is toxic. It is filled with inflammatory markers, cytokines, and cellular wastes that just constantly irritate and burn the nerve endings.

SPEAKER_00 28:01

A very spicy soup.

SPEAKER_01 28:03

Right. And we used to think exercise was just reinforcing the structural integrity of the bowl holding the soup. But this research suggests exercise is actually changing the recipe of the soup itself.

SPEAKER_00 28:13

That is a fantastic analogy. Mechanical load, the actual muscle contraction, the cardiovascular exertion, the sheer force of cartilage compressing and decompressing it sends powerful cellular signals. It prompts the body to release anti-inflammatory cytokines, it flushes out metabolic waste, and it restores a healthier chemical balance within that joint environment.

SPEAKER_01 28:35

That's incredible.

SPEAKER_00 28:36

The pain goes down because the chemical irritation of the nerves goes down long before the muscle mentally grows in size.

SPEAKER_01 28:42

Mind-blowing. Okay, the third alternative mechanism they list is kinesiophobia.

SPEAKER_00 28:46

Kinesiophobia translates literally from Greek as the fear of movement. And the evidence shows that a targeted reduction in this specific fear strongly explains the benefits of exercise programs for conditions like rotator cuff-related shoulder pain and low back pain.

SPEAKER_01 29:00

Let me make sure I'm fully grasping the clinical reality of this. Are you saying that going to the physical therapy clinic for a bad shoulder isn't just a mechanical tune-up, it's practically a psychological exposure therapy session, heavily mixed with a systemic inflammation flush.

SPEAKER_00 29:17

That is exactly what a world-class physical therapy session is. Think about the person with chronic shoulder pain. Six months ago, reaching for a high shelf caused a sharp blinding pain.

SPEAKER_01 29:28

Right.

SPEAKER_00 29:29

Their brain learned from that event and created a protective fear response. Now they subconsciously stop reaching up entirely. The shoulder castle gets stiff from disuse, the brain gets even more hypervigilant and protective, and the tissue gets starved of blood flow. It's a vicious cycle.

SPEAKER_01 29:44

It just feeds on itself.

SPEAKER_00 29:45

It does. But when a therapist guides them through a gradual, highly controlled exercise program, maybe starting with just sliding their hand up a wall, they are performing graded exposure therapy. They are systematically exposing the patient's nervous system to the feared movement in a safe, controlled environment.

SPEAKER_01 30:02

Just like treating a phobia?

SPEAKER_00 30:03

Exactly. They are teaching the brain that movement does not equal massive tissue damage. As the fear evaporates, the protective muscle guarding relaxes, blood flow returns, and the pain dissipates alongside it.

SPEAKER_01 30:16

We are literally changing our minds and our cellular environment, not just bulking up our muscles, which leads perfectly to the last major mechanism highlighted in the text: trust, motivation, and confidence.

SPEAKER_00 30:28

Ah, yes.

SPEAKER_01 30:29

The paper cites a realist review on persistent low back pain that emphasizes how utterly crucial these human factors are.

SPEAKER_00 30:37

This brings us out to the outer ring of figure one, the therapeutic relationship. In modern highly clinical medicine, we often deeply underestimate the profound physiological impact of feeling heard, understood, and supported by a healthcare professional.

SPEAKER_01 30:51

We just want the pills or the quick fix.

SPEAKER_00 30:53

Right. But the therapeutic alliance, that bond of trust between the patient and the clinician, it does optimize adherence to the exercise program, meaning they actually do their homework. But it also directly impacts the clinical outcomes on a biological level.

SPEAKER_01 31:06

Real just trusting the person helps.

SPEAKER_00 31:08

Absolutely. When a patient genuinely trusts their therapist, their anxiety drops. And their anxiety drops, their sympathetic nervous system, the fight or flight response downregulates, cortisol drops, muscle tension drugs. It is a biological intervention delivered entirely through human connection.

SPEAKER_01 31:24

Aaron Powell So what does this all mean? We have this incredible revelation. We know the old purely biomechanical model is deeply flawed, and we know the biopsychosocial model is vastly more accurate, nuanced, and helpful.

SPEAKER_00 31:37

Yes.

SPEAKER_01 31:37

But how do we translate these high-level scientific findings into actionable takeaways? I mean, let's inject some real world friction here. Okay. How does this change the literal conversation happening in a physical therapy office tomorrow morning, especially in a messy healthcare system where insurance companies only want to pay for a 15-minute appointment where you just like count reps of leg extensions?

SPEAKER_00 31:58

It's a real challenge. But if we connect this to the bigger picture, the authors recognize that friction. They provide five direct actionable implications for clinical practice and research to help turn this huge ship around. And the very first one is a direct command to clinicians on the floor.

SPEAKER_01 32:19

They actually provide an entirely new script, an alternative message for clinicians to use with patients, and I want to read it word for word because it is so radically different from the old way of doing things. Please do. The authors suggest saying exercise can benefit many people with MSK pain, even when underlying mechanisms vary or remain unclear. Through keeping active and gradually challenging your body, exercise can help you adapt in ways that build confidence, reduce pain, and improve function, ultimately helping you get back to doing the things you want and need to do. The key is finding the type of exercise that works for you, your goals, your experience, and your interests.

SPEAKER_00 32:56

Notice what is conspicuously missing from that script.

SPEAKER_01 32:59

The word strength, it's entirely gone.

SPEAKER_00 33:01

Gone. Replaced with words like adapt, build confidence, goals, and interests. This completely empowers the patient. It shifts the focus from a pass-fail physical test, you are weak, we must make you strong, to a personalized journey of neurological adaptation and reclaiming their life.

SPEAKER_01 33:19

I love that.

SPEAKER_00 33:20

It might be harder to build an insurance company for building confidence, but clinically, it is vastly superior.

SPEAKER_01 33:26

Which perfectly aligns with their second implication. Continue to broaden intervention targets. If we aren't just stubbornly targeting muscle hypertrophy, what are we targeting in that 15-minute window?

SPEAKER_00 33:36

Clinicians need to address the whole human psychosocial factors, metabolic health, and movement confidence. A highly effective therapy session might not involve heavy lifting at all.

SPEAKER_01 33:47

What would it look like instead?

SPEAKER_00 33:48

It might involve discussing a patient's sleep quality, analyzing their daily stress levels, or simply experimenting to find a form of movement that brings them joy rather than dread. Because, as we've established, all of those factors mediate pain release more powerfully than purely mechanical loading.

SPEAKER_01 34:05

And the third implication is directed at the researchers out there. Design trials that test mechanisms, not just effects.

SPEAKER_00 34:12

Right. We need to stop publishing shallow studies that only say intervention a reduce pain by three points. That doesn't help us evolve. We need prospectively planned causal mediation analyses that are adequately powered to investigate these multidimensional mediators.

SPEAKER_01 34:28

We need to see under the hood.

SPEAKER_00 34:29

Yes. We need to measure the fear, track the self-efficacy scores, draw blood to measure the biomarkers, and prove exactly how the engine is being fixed, rather than just celebrating that the knocking noise stopped.

SPEAKER_01 34:41

The fourth point is about refining communication. The authors state clearly until sufficient causal evidence accumulates, reconsider saying you need to get stronger to feel better.

SPEAKER_00 34:51

We must fundamentally recategorize how we talk about strength. We must treat strength as a marker of improved physical robustness and overall health rather than a rigid, mechanical prerequisite for being pain-free. It's a subtle linguistic shift, but it is a massive psychological distinction for the patient.

SPEAKER_01 35:09

But, and this is a massive crucial nuance that we absolutely must cover so we don't accidentally send the wrong message to our listener today. The authors include a fifth implication, and it is titled, Boldly, Strength Still Matters. Yes.

SPEAKER_00 35:25

We cannot throw the baby out with the bathwater here. The authors are incredibly careful to ensure that the listener and the broader medical community knows that getting stronger isn't useless. In fact, it is profoundly valuable, just for different reasons than we originally thought.

SPEAKER_01 35:41

It sounds like we need to rebrand strength training. It's not the acute localized painkiller we thought it was, but it's practically the ultimate longevity vitamins.

SPEAKER_00 35:50

That's a great way to look at it.

SPEAKER_01 35:51

The paper outlines several incredible biomotor benefits that have nothing to do with immediate pain relief.

SPEAKER_00 35:56

Exactly. For long-term general health, progressive strength training is essentially non-negotiable. The text cites research like Chen and Garcia Hermoso, showing that getting physically stronger is one of those powerful indicators of healthy biological aging.

SPEAKER_01 36:11

It keeps you young.

SPEAKER_00 36:12

It does. Improved strength and balance support long-term functional independence and dramatically reduce the risk of falls in older adults, which is a massive, often fatal public health issue.

SPEAKER_01 36:23

They even mention it's associated with a lower risk of all-cause mortality. Literally, being physically stronger makes you less likely to die from any cause. That's a pretty decent side effect of lifting weights.

SPEAKER_00 36:36

It is. And there are still highly specific clinical contexts where mechanical strength is paramount.

SPEAKER_01 36:42

Like what?

SPEAKER_00 36:42

The authors highlight anterior cruciate ligament or ACL reconstruction rehabilitation. In those specific surgical recoveries where a new piece of tissue has been literally bolted into the knee, increased mechanical strength of the surrounding musculature is directly associated with better functional outcomes.

SPEAKER_01 36:59

So the biomechanics do matter there.

SPEAKER_00 37:01

Yes. So resistance training remains an absolute cornerstone of human health. Acknowledging these broader benefits allows us to contextualize the limited role of strength gains in acute pain reduction without diminishing its massive clinical importance for overall human thriving.

SPEAKER_01 37:16

So to summarize this incredibly deep journey we've been on today, we started with the universal, highly intuitive assumption that the human body is a machine. When a joint hurts, we assumed we needed to build bigger, thicker muscles around it to fix the broken mechanics.

SPEAKER_00 37:32

The old reliable narrative.

SPEAKER_01 37:33

Right. But we discovered through rigorous causal mediation analysis that this idea that bigger muscles directly equal less pain is largely a myth when it comes to things like tendinopathy, shoulder pain, and osteoarthritis.

SPEAKER_00 37:47

The physical strength bridge simply isn't carrying the pain relief traffic.

SPEAKER_01 37:52

Instead, the reality is a beautiful, deeply complex biopsychosocial web. When we exercise a painful joint, we aren't just tightening a pulley. We are performing an incredible feat of multitasking. We are psychologically reducing our brain's fear of movement.

SPEAKER_00 38:07

We are physically lowering systemic inflammation and altering the biochemical soup of the joint.

SPEAKER_01 38:12

We are neurologically improving our confidence and self-efficacy.

SPEAKER_00 38:15

And we are benefiting from the profound autonomic downregulation of a trusting therapeutic relationship.

SPEAKER_01 38:21

Exercise is an amazing, near miraculous intervention for musculoskeletal pain, but its magic lies in adaptation and confidence, not just hypertrophy. Thank you to you, the listener, for taking this deep dive with us into the hidden mechanics of your own biology and psychology. It really changes how you view your next workout, doesn't it? It's not just reps and sets anymore.

SPEAKER_00 38:43

It changes absolutely everything. And it leaves us with a fascinating, perhaps slightly provocative thought to carry forward.

SPEAKER_01 38:49

Oh, already.

SPEAKER_00 38:50

We've just spent all this time uncovering how our experience of physical joint and muscle pain is heavily mediated by our internal beliefs, our learned fear of movement, our biochemical environment, and our deep trust in our surroundings, rather than just the physical tissue itself.

SPEAKER_01 39:05

Right.

SPEAKER_00 39:06

So if the knee and the shoulder and the spine are so deeply tied to our psychology and systemic health, what other mechanical problems in our bodies are actually profound biopsychosocial experiences, just waiting to be understood?

SPEAKER_01 39:18

What an incredible question to leave off on. We are so much more than meat machines waiting for a mechanic. Keep questioning the intuitive logic of the world around you. Keep moving in ways that build your confidence, and we'll see you on the next deep dive.