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Built for speed: musculoskeletal structure and sprinting ability.
Sabrina S M Lee1, Stephen J Piazza
1Department of Kinesiology, The Pennsylvania State University, University Park, 16802, USA.
Sprinting speed is enhanced by a smaller Achilles' tendon moment arm and longer toes. These adaptations in sprinters improve the foot's "gear ratio," optimizing muscle function for greater forward impulse during push-off.
Area of Science:
- Biomechanics
- Human locomotion
- Sports science
Background:
- The foot and ankle's musculoskeletal structure significantly impacts sprinting performance.
- Ankle joint mechanics, including the Achilles' tendon moment arm and plantarflexor function, are critical for propulsion.
Purpose of the Study:
- To investigate the relationship between foot and lower leg morphology and sprinting ability.
- To compare biomechanical parameters between collegiate sprinters and non-sprinters.
Main Methods:
- Measurement of Achilles' tendon plantarflexion moment arms.
- Assessment of lateral gastrocnemius fascicle lengths and pennation angles.
- Analysis of foot and lower leg anthropometric characteristics in sprinters and non-sprinters.
Main Results:
- Sprinters exhibited significantly smaller Achilles' tendon moment arms (25% less) and longer fascicles (11% longer) compared to non-sprinters.
- The ratio of fascicle length to moment arm was 50% greater in sprinters.
- Sprinters possessed longer toes and shorter lower legs.
Conclusions:
- Shorter Achilles' tendon moment arms and longer toes enhance forward impulse generation during sprinting.
- These morphological adaptations optimize the foot's 'gear ratio,' improving plantarflexor efficiency and prolonging ground contact time for acceleration.
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