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Research Deep-Dive: Hamstring Strength & Running Biomechanics

This episode reviews the study: “Hamstring Strength and Architectural Properties Are Associated with Running Biomechanics”, including findings from ultrasound imaging, EMG analysis, and 3D running mechanics. 

Key Study Questions

• Do stronger hamstrings create better running mechanics?
• Do better mechanics help build stronger, longer hamstrings?
• How do strength, fascicle length, pelvic position, and muscle activation interact?

🔎 Main Findings From the Study

1. Stronger Hamstrings = Better Running Mechanics

Athletes with higher eccentric hamstring strength had:

• Higher stride frequency (cadence)
• Better control of decelerating the swinging leg
• Lower ground contact time (improved efficiency)
• Lower hamstring activation at sub-max speeds → reduced overload 

2. Longer Hamstring Fascicles = Safer, More Efficient Loading

Runners with longer fascicle lengths showed:

• Less anterior pelvic tilt
• Lower hamstring activation
• Better ability to tolerate late-swing loading (a high-irritation phase for PHT) 

3. A Two-Way Relationship Exists

Strength ↔ mechanics influence each other.

• Stronger hamstrings → better running technique
• Better running technique → better hamstring loading → stronger, longer muscle structure over time
   This creates a positive adaptation loop. 

4. Over-Reliance on the Biceps Femoris = Red Flag

Runners with weak or short hamstrings tended to over-activate the biceps femoris long head — the most common site of PHT.
Stronger runners shared load better with the medial hamstrings, reducing tendon stress. 

🏃 Practical Rehab Takeaways

1. Build Eccentric Strength

Eccentric strength is one of the strongest predictors of hamstring injury risk.
 Examples Brodie recommends:

• Hamstring sliders
• Weighted eccentric sliders
• Single-leg sliders
• Assisted → full Nordic drops
• Deadlifts (when tolerated) 

2. Improve Fascicle Length

Eccentric exercises at long muscle lengths help lengthen fascicles naturally — more so than stretching alone.

3. Strengthen the Medial Hamstrings

To prevent overload of the biceps femoris:

• Use toes-in hamstring curls
• Toes-in sliders
• Toes-in deadlift variations
   These help redistribute load more evenly across the tendon. 

4. Slightly Increase Cadence (~5%)

A small increase in stride frequency may reduce late-swing strain and improve running economy.

5. Integrate Running Into Rehab

Before adding speed:

• Build to 30 minutes continuous, easy running → symptom-free
  Then introduce:
• Strides (15–20 sec at ~75% speed, 4 reps)
• Gradual progression based on symptoms the next day 

Final Thoughts

Hamstring strength, muscle architecture, and running technique are deeply interconnected. Improving one helps improve the others — creating a pathway toward better performance and long-term PHT resilience.

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MEDICAL & EDUCATIONAL DISCLAIMER

The information provided in the Overcoming Proximal Hamstring Tendinopathy (PHT) Podcast, YouTube channel, associated websites, social media, and other educational content produced by Brodie Sharpe is provided for general educational and informational purposes only. It is not intended to constitute, and should not be relied upon as, individual medical, physiotherapy, diagnostic or treatment advice.

Although Brodie Sharpe is a qualified physiotherapist, consuming this content does not establish a physiotherapist-patient or other healthcare professional-patient relationship. Any discussion of symptoms, diagnoses, rehabilitation strategies, exercises, loading programs, running modification, medications, supplements, injections, medical procedures or other treatment options is general in nature and may not be appropriate for your individual circumstances.

Musculoskeletal pain can have multiple causes, and symptoms that appear consistent with proximal hamstring tendinopathy or another tendon disorder may arise from other conditions. Appropriate assessment, diagnosis and treatment depend upon an individual's medical history, symptoms, examination findings, medications, health conditions, training history and other factors that cannot be adequately assessed through general online content.

Do not use this content as a substitute for assessment, diagnosis or treatment from an appropriately qualified healthcare professional. 

Before starting, stopping or substantially modifying an exercise or rehabilitation program, medication, supplement, injection, procedure or other treatment discussed in this content, seek advice from an appropriately qualified healthcare professional who can consider your individual circumstances.

Exercise, rehabilitation and medical treatments carry inherent risks. These may include increased pain, symptom flare-ups, aggravation of an existing condition, new injury, adverse reactions or other complications. Individual responses vary and no particular outcome, improvement, recovery timeframe or return to sport can be guaranteed. If an activity or intervention causes significant, unusual or worsening symptoms, stop and seek appropriate professional advice.

References to research, clinical studies, treatment approaches, products or opinions of guests are provided for educational purposes. Scientific evidence evolves over time, may be incomplete or conflicting, and findings from research populations may not apply to every individual. Discussion of a treatment or product does not necessarily constitute an endorsement or recommendation for its use. Views expressed by podcast guests or other contributors are their own and do not necessarily represent the views of Brodie Sharpe.

To the extent permitted by applicable law, Brodie Sharpe and associated businesses, contractors and contributors accept no liability for loss, injury, damage or adverse outcomes arising from reliance upon or use of this general educational content. Nothing in this disclaimer is...