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Leg power and hopping stiffness: relationship with sprint running performance
1Laboratoire de Physiologie-GIP Exercice, Groupe PPeh, Faculté de Médecine, Saint Etienne, France.
Medicine and Science in Sports and Exercise
|February 27, 2001
Summary
Leg power is crucial for sprint acceleration and maximal velocity. However, leg stiffness is a key factor for achieving high running speeds, suggesting a distinct role for each in sprint performance.
Area of Science:
- Biomechanics
- Human Movement Science
- Sports Physiology
Background:
- Sprint performance relies on both muscle power and leg mechanics.
- Previous research has not directly measured leg power, leg stiffness, and sprint performance together in human runners.
Purpose of the Study:
- To investigate the relationship between leg power, leg stiffness, and sprint performance in human runners.
- To determine the specific contributions of leg power and leg stiffness to acceleration and maximal velocity during sprinting.
Main Methods:
- 11 male subjects (16 ± 1 years) performed a 40-m sprint measured by radar.
- Leg muscle volume was estimated anthropometrically.
- Leg power was assessed via an ergometric treadmill test and a hopping test.
- Leg stiffness was calculated from flight and contact times during hopping jumps.
Main Results:
- Treadmill-derived leg power strongly correlated with sprint acceleration (r = 0.80) and maximal velocity (r = 0.73).
- Leg stiffness, calculated from hopping, significantly correlated with maximal running velocity but not with acceleration.
Conclusions:
- Muscle power is essential for both sprint acceleration and maintaining maximal velocity.
- High leg stiffness appears critical for achieving high running speeds during sprinting.
- Future research could explore measuring rebound stiffness during vertical jumps to assess this characteristic.