The influence of Achilles tendon mechanical behaviour on 'apparent' efficiency during running at different speeds
| Autor: | Paola Zamparo, Vasilios Baltzopoulos, Constantinos N. Maganaris, Andrea Monte |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2020 |
| Předmět: |
Tendon mechanics
Gastrocnemius medialis Adult Male Materials science Physiology Net energy Kinematics Kinetic energy Achilles Tendon Running 03 medical and health sciences 0302 clinical medicine Physiology (medical) medicine Humans Orthopedics and Sports Medicine Achilles tendon Work (physics) Public Health Environmental and Occupational Health Elastic energy 030229 sport sciences General Medicine musculoskeletal system Elasticity Tendon Biomechanical Phenomena medicine.anatomical_structure Original Article Energy Metabolism 030217 neurology & neurosurgery Biomedical engineering Running efficiency |
| Zdroj: | European Journal of Applied Physiology |
| ISSN: | 1439-6327 1439-6319 |
| Popis: | Purpose We investigated the role of elastic strain energy on the “apparent” efficiency of locomotion (AE), a parameter that is known to increase as a function of running speed (up to 0.5–0.7) well above the values of “pure” muscle efficiency (about 0.25–0.30). Methods In vivo ultrasound measurements of the gastrocnemius medialis (GM) muscle–tendon unit (MTU) were combined with kinematic, kinetic and metabolic measurements to investigate the possible influence of the Achilles tendon mechanical behaviour on the mechanics (total mechanical work, WTOT) and energetics (net energy cost, Cnet) of running at different speeds (10, 13 and 16 km h−1); AE was calculated as WTOT/Cnet. Results GM fascicles shortened during the entire stance phase, the more so the higher the speed, but the majority of the MTU displacement was accommodated by the Achilles tendon. Tendon strain and recoil increased as a function of running speed (P P −1 m−1). Significant negative correlations (P P Conclusion These results support the notion that the dynamic function of tendons is integral in reducing energy expenditure and increasing the “apparent” efficiency of running. |
| Databáze: | OpenAIRE |
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