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Stem cells are one of the most talked-about frontiers in medicine—but how much of it actually applies to runners dealing with tendon pain?

In this episode, I’m joined by orthopaedic surgeon and researcher Chukwuweike Gwam to break down the latest evidence on stem cells and tendon healing. We unpack what stem cells actually are, how they work in the body, and whether they live up to the hype when it comes to treating tendinopathy.

We also explore the real-world limitations, risks, and costs—alongside what the future might hold for regenerative medicine in running injuries.

If you’ve ever considered injections, biologics, or wondered if stem cells are “the next big thing”… this episode will bring you up to speed.

About Chukwuweike Gwam MD:

•  Orthopaedic surgeon (USA) specialising in hip & knee reconstruction 
•  MD (Howard University), PhD in Molecular Medicine (Wake Forest), MBA 
•  Research focus: regenerative medicine, stem cells, and translational science 
•  Passion for improving healthcare access and bringing lab discoveries into real-world treatment 

Follow him on Instagram:
https://www.instagram.com/chukwuweike_g/

Key Topics & Insights

What Are Stem Cells (In Simple Terms)?

•  Think of stem cells as the body’s “repair reserve”
•  They help regenerate tissue by: 
  •  Creating new cells 
  •  Regulating inflammation 
•  We all have them—but: 
  • Quantity decreases with age
  • Quality declines significantly

Why Do We Heal Slower As We Age?

It’s not just one factor—it’s a combination:

•  Reduced stem cell quality and number 
•  Slower blood vessel formation 
•  Reduced cellular signalling 
•  Increased “senescent” (non-functioning) cells 

In other words: your repair system is still there… just less efficient.

Stem Cells & Tendon Healing — The Theory

The idea is simple:

1.  Harvest stem cells (fat, bone marrow, etc.) 
2.  Process them 
3.  Inject them into the injured tendon 

The goal:

•  Improve collagen structure 
•  Enhance healing response 
•  Accelerate recovery 

But here’s the key point…

👉 They are NOT a magic bullet—they’re an adjunct.

What the Research Actually Shows

From their literature review (2015–2025):

•  ~1,800 papers screened 
•  ~150 relevant studies included 

Findings:

•  Improved collagen alignment (under a microscope) 
•  Increased tensile strength (in animal models) 
•  No consistent improvement in long-term human outcomes 

👉 Especially beyond 6–12 months, results tend to equalise.

The Most Interesting Finding

In rotator cuff studies:

•  Stem cells improved early recovery (first ~6 months)
•  But no long-term difference compared to standard treatment 

Why?

•  Stem cells likely help regulate early inflammation 
•  The body eventually “catches up” on its own 

Why Results Are So Inconsistent

This is the biggest limitation:

No standardisation.

•  Different sources (fat, bone marrow, skin) 
•  Different processing methods 
•  Different patient health profiles 

👉 Your stem cells ≠ someone else’s stem cells

Risks & Limitations

•  Potential for tumour formation (teratomas) with certain stem cell types 
•  High variability in outcomes 
•  Mostly animal-based evidence
•  Difficult to control how cells behave once injected 

Cost vs Benefit (Reality Check)

•  Stem cell injections: ~$3,000–$5,000+ 
•  Cortisone: ~$200 
•  Rehab: far cheaper, highly effective 

In most cases:
 You’re paying a premium for uncertain benefit.

What About PRP?

•  Some benefit for: 
  •  Tennis elbow 
  •  Chronic tendinopathy 
•  But: 
  •  Highly variable 
  •  Not clearly superior to rehab 

Again, works best alongside loading—not instead of it.

Practical Takeaways (For Runners)

•  Stem cells are promising—but not ready for prime time (yet)
•  They may: 
  •  Speed up early recovery 
  •  Improve tissue quality (in theory) 
•  But: 
  •  Don’t outperform rehab long-term 
  •  Are expensive and inconsistent 

The fundamentals still win:

•  Progressive loading 
•  Smart training 
•  Patience 

•  📲 Follow Dr. Gwam: https://www.instagram.com/chukwuweike_g/

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On today’s Q&A episode, Brodie tackles a wide range of listener-submitted questions—covering everything from preparing for mountain races without hills, structuring marathon training in your 50s, and the science of hydration, to managing lateral knee pain, deload weeks, and cardiac drift in ultra events.

The common thread is learning how to train smarter by understanding why your body responds the way it does—and how to adjust accordingly.

Key Questions & Insights

Training for Mountain Events (While Living on the Flats)

•  Prioritise VO₂ max development (e.g. Norwegian 4x4 or 30:30 intervals) 
•  Build strength and power: 
  •  Walking lunges, split squats, calf raises 
•  Prepare for downhill demands with eccentric quad training (e.g. reverse Nordics) 
•  Use incline treadmills and stairs to simulate terrain 
•  Key principle: bridge the gap between your environment and race demands 

Marathon Training at 57 (Sub 3:30 Goal)

•  Current structure (4 runs + 2 strength days) is solid 
•  Ensure 80/20 intensity balance (most running easy) 
•  Strength training should include: 
  •  Squats, deadlifts, lunges, calf raises 
  •  Focus on heavier loads (6–8 reps) for performance gains 
•  Don’t overlook: 
  •  Recovery (sleep, nutrition) 
  •  Deload weeks every 4–5 weeks 

Hydration & Recovery (The Science)

Hydration plays a critical role in recovery through:

•  Nutrient delivery (oxygen, glucose, amino acids via blood plasma) 
•  Muscle repair signaling: 
  •  Hydrated cells promote protein synthesis 
  •  Dehydrated cells increase protein breakdown 
•  Glycogen replenishment efficiency 

Practical takeaway:

•  Measure sweat rate (pre/post run weighing) 
•  Replace both fluids and electrolytes, especially in long or hot runs 

Lateral Knee Pain in Runners

Potential causes discussed:

•  ITB friction syndrome (load/repetition-based irritation) 
•  Patellofemoral pain 
•  Other joint-related issues (requires proper diagnosis) 

Key management strategies:

•  Stay below pain threshold (0–1/10) 
•  Use run-walk strategies to manage load 
•  Address contributing factors: 
  •  Cadence 
  •  Step width 
  •  Downhill running exposure 
•  Strength helps, but load management is the priority 

How to Structure a Deload Week

Purpose: allow accumulated fatigue to recover and adaptations to occur

Options for strength training deload:

•  Reduce frequency 
•  Reduce load (~30%) 
•  Reduce range of motion 
•  Or a combination 

Key goal:
 Start the next training block feeling fresh, strong, and ready to progress

Cardiac Drift in Long Runs & Ultras

What it is:

•  Gradual rise in heart rate despite constant effort 

Main contributors:

•  Dehydration 
•  Heat stress 
•  Glycogen depletion 
•  Neuromuscular fatigue 

Strategies to delay drift:

•  Start conservatively (70–75% HR max) 
•  Prioritise hydration and electrolytes 
•  Maintain carbohydrate intake (60–90g/hr) 
•  Manage heat (cooling strategies, pacing adjustments) 

Key Takeaways

•  Train the physiology required, even if you can’t replicate the exact environment 
•  Recovery (hydration, sleep, nutrition) is just as important as training 
•  Pain management = load management first, not just strengthening 
•  Deload weeks are essential for long-term progression 
•  Cardiac drift is inevitable, but you can delay and manage it

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Returning to running after injury isn’t as simple as waiting until you’re pain-free and heading back out the door.

In this episode, I sit down with Eric Hegedus to break down a structured, evidence-informed approach to returning to running—based on his clinical commentary and years of working with injured runners.

We dive into how to bridge the gap between rehab and performance, why so many runners get re-injured, and how to use simple tools like TRIMP to guide your training decisions.

If you’ve ever felt unsure about when to run, how much to do, or whether you’re progressing too quickly… this episode gives you a clear framework to follow.

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In this month’s Latest Running Research episode, Brodie breaks down three fascinating studies that challenge common beliefs and refine how runners should approach performance and injury prevention. First, a randomized controlled trial on ketone supplementation reveals that while ketones significantly improve cognitive function—helping with reaction time and mental clarity—they do not improve running performance, efficiency, or fuel utilization. Despite feeling better during efforts, runners didn’t run faster, and some even experienced gastrointestinal issues, raising questions about their real-world value for endurance athletes. 

Next, Brodie explores a meta-analysis comparing high-intensity interval training (HIIT) vs moderate continuous running (MICT). The key takeaway: HIIT is more effective at improving running economy (efficiency at submax speeds), particularly at moderate intensities, while steady running is better for improving VO₂ max (your aerobic engine). This reinforces the idea that both training styles serve different physiological purposes—and combining them strategically is the smartest approach for performance gains.

Finally, a newly released review challenges one of the most common rehab narratives: that weak glutes cause poor running mechanics. Across 19 studies, there was no consistent link between hip strength and running biomechanics, and even strengthening programs failed to meaningfully change running form. Instead, Brodie reframes strength training as a way to increase load capacity, not “fix” technique—highlighting the importance of gait retraining and smart load management over blindly strengthening muscles.

🎯 Key Takeaways

•  Ketones may sharpen your brain—but won’t make you run faster
•  HIIT improves efficiency, steady running builds aerobic capacity → you need both
•  Stronger glutes ≠ better running form → focus on capacity, not just mechanics
•  Fatigue, load, and training errors remain the biggest drivers of injury risk

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Episode Summary

In this Q&A episode, Brodie answers listener-submitted questions covering everything from transitioning to zero drop shoes to fixing ITB pain, understanding Zone 2 training accuracy, and safely introducing sprint work.

Along the way, he breaks down common misconceptions, highlights what actually matters, and provides practical, step-by-step strategies you can apply straight away.

If you’ve ever felt confused by conflicting advice or stuck in an injury cycle, this episode will help you cut through the noise and run smarter.

🧠 Questions Covered

• How do you safely transition to zero drop / minimalist shoes (especially with a neuroma)?
• What are the best exercises for ITB syndrome—and are exercises even the priority?
• Do you need a VO2 max test to truly train in Zone 2?
• What’s the safest way to introduce sprint training?
• Why do your calves (soleus) feel like they’re burning early in runs—and what can you do about it?

🔑 Key Takeaways

Zero Drop Transition

• Transition gradually—this is non-negotiable
• Start with walking / strength work before running
• Introduce running in small doses (5–10 minutes per run)
• Build volume slowly (~10% per week)
• Monitor for warning signs: calf tightness, foot pain, Achilles stiffness

ITB Pain (What Actually Matters)

• The cause is usually load + mechanics, not just weakness
• Common triggers:
  • Downhill running
  • Narrow or crossover step width
  • Cambered surfaces
• First line of treatment:
  • Modify training load and mechanics
• Strength work (secondary but helpful):
  • Step-downs
  • Crab walks
  • Hip hikes
  • Single-leg control work

Zone 2 Training (Do You Need Lab Testing?)

• VO2 max testing = gold standard, but not essential
• Most runners can rely on:
  • Effort (RPE)
  • Conversation test
• True Zone 2 should feel:
  • Sustainable for long durations
  • Minimal fatigue buildup
  • “Could do it all over again” effort

Introducing Sprint Training

• Start with strides, not all-out sprints
• Structure:
  • Gradual acceleration (15 sec)
  • Short peak speed (8–10 sec)
  • Full recovery (1–2 min)
• Progression:
  • Start with 4 reps at ~75% effort
  • Build to 6–8 reps at ~90–95% effort
• Keep it controlled and progress gradually

Burning Calves (Soleus Overload vs Something Else)

• The soleus handles very high loads during running
• Common overload factors:
  • High intensity or hills
  • Minimalist footwear
  • Rapid training increases

But… consider another possibility:

👉 Compartment syndrome

Clues it might not be “just tight calves”:

• Burning sensation early in runs
• Bilateral symptoms
• Long-standing issue despite rehab
• Forced to stop rather than push through

Helpful strategies:

• Longer, more gradual warm-ups
• Walk/run approach
• Avoid sudden intensity spikes
• Let symptoms settle before continuing

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This episode is a previously recorded Ask Me Anything (AMA) that was originally released exclusively to podcast patrons. Now that the patron platform has been discontinued, these conversations are being shared on the main feed so the broader Run Smarter audience can benefit from the questions and discussions.

In this AMA, Brodie answers listener questions on several common challenges runners face. The episode begins with a deep dive into a practical training question: Is it better to improve running performance using run-walk intervals or continuous running? Brodie explains that the “best” approach depends on factors such as experience level, recent time off running, current injury status, effort levels, fatigue, and overall training consistency. The key takeaway is that consistent mileage without injury is the biggest driver of improvement, and run-walk strategies can often help runners build volume safely while maintaining proper effort levels. 

The episode then shifts to injury management and race readiness. Brodie discusses how to distinguish between a manageable symptom flare-up and a warning sign that training load is too high. He emphasizes that runners should only race when their training has built enough confidence and tissue capacity to tolerate race demands, rather than rushing into events prematurely. Finally, he addresses a question about persistent knee pain and whether it’s better to consult a physio, doctor, or another professional. His advice: seek a practitioner you trust, someone who explains the problem clearly, provides a long-term plan, and adjusts treatment if progress stalls.

Key Takeaways for Runners

• Consistency beats everything. The best training strategy is the one you can maintain week after week without breaking down.
• Run-walk intervals can be powerful. They help manage fatigue, reduce repetitive loading, and allow runners to safely build mileage.
• Effort matters more than format. Easy runs should stay easy (roughly 2–3/10 effort) to maintain an effective training balance.
• Don’t rush back into racing. Confidence and capacity should be built gradually through training before entering an event.
• If rehab isn’t improving over time, something needs to change. Consider reassessing diagnosis, load management, or the practitioner guiding your rehab.

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Tendon pain is often treated as a purely physical problem. Strengthen the tendon, adjust the load, and eventually things should improve.

But what happens when the pain persists for months… or even years?

In this episode, Brodie speaks with physiotherapist and PhD researcher Jack Mest about a recent systematic review and meta-analysis exploring the psychological profile of people with persistent tendinopathy. The research compared people with chronic tendon pain to healthy controls and uncovered something surprising: fear of movement wasn’t the main psychological factor.

Instead, the research found that pain catastrophizing — a negative outlook toward pain and recovery — appeared more common in people with persistent tendinopathy.

This episode explores how psychological factors may influence tendon pain, why lower limb injuries may carry a greater psychological burden, and why clinicians need to treat the person behind the injury — not just the tendon itself.

If you’re a runner struggling with Achilles pain, plantar fasciopathy, proximal hamstring tendinopathy, or another persistent tendon injury, this conversation will help you understand why recovery can feel so frustrating — and what might help.

In This Episode

Brodie and Jack discuss:

• Why tendinopathy often becomes a chronic condition
• What the biopsychosocial model means for tendon rehab
• The difference between kinesiophobia (fear of movement) and pain catastrophizing
• Why catastrophizing appears more common in persistent tendon pain
• Why lower limb tendinopathies may have greater psychological impact than upper limb injuries
• The role of beliefs, expectations, and past experiences in shaping pain
• Why clinicians should ask about patients’ thoughts and fears about their injury
• Whether psychological traits are pre-existing or develop after chronic pain begins
• Practical advice for runners dealing with long-term tendon pain

About the Guest

Jack Mest is a physiotherapist and PhD researcher whose work focuses on understanding why tendinopathy becomes chronic and how psychological factors influence tendon pain.

His research aims to improve the way clinicians approach tendon rehabilitation by integrating biological, psychological, and social factors into treatment.

Follow Jack's research and updates:
 X (Twitter): @Mest_Jack
Facebook: Jack Mest Physio
Paper summary: https://www.jospt.org/do/10.2519/jospt.blog.2026017/full/ 

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Andy Blow is the founder of Precision Hydration and a former elite triathlete. In today's episode, we delve into the misconceptions around sweat & hydration advice and how to individually tailor a fueling strategy to help your performance.

Andy also answers your questions around cramping, running in cold conditions, gels for a sensitive stomach and if hydrating days before a race is necessary. 

Check out precisionhydration.com for electrolytes and fuelling products.

Click here to book in a free 1 on 1 chat with the precision hydration team.

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In this month’s research roundup, Brodie reviews three new papers examining super shoes (advanced footwear technology) and their impact on running economy and performance.

Across a large review, a meta-analysis, and a randomized crossover trial, the consistent finding was a ~2.5–3% improvement in running economy when using carbon-plated, high-stack, high-rebound foam shoes. Importantly, benefits weren’t limited to elites. Even at slower speeds (7.5–12 km/h), recreational runners showed meaningful reductions in oxygen cost, translating to roughly a 1% improvement in marathon performance — about three minutes for a four-hour runner.

The key insight is that it’s not just the carbon plate doing the work. The performance gains appear to come from a synergy between plate stiffness, PEBA-style high-rebound foams, rocker geometry, and stack height. The shoes don’t “create” energy — they reduce energy loss, particularly around the big toe joint and during stance. Interestingly, comfort didn’t correlate with better economy, and biomechanical changes were smaller than many expected.

From a practical standpoint, super shoes offer real performance advantages, but gradual integration is essential. Altered loading patterns and increased stiffness may raise injury risk if introduced abruptly, with case reports highlighting midfoot stress reactions. Rotate them in carefully, monitor symptoms, and be aware that high-rebound foams can degrade over time, reducing their metabolic benefit.

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In this episode, Brodie dives into a long-awaited research review examining whether active cool downs actually do what we’ve been told they do.

You’ve probably heard that cooling down helps “flush lactic acid,” reduce soreness, prevent injury, and speed up recovery.

But what does the evidence say?

This episode breaks down a comprehensive narrative review titled “Do we need a cool down after exercise?” and explores the physiological, psychological, performance, and injury-related effects of active cool downs compared to passive recovery