Fatigue and soft tissue vibration during prolonged running

•The changes in vibration properties of the gastrocnemius muscle during prolonged running was investigated.•The vibration amplitude of soft tissue increased with fatigue.•The percent increase in vibration amplitude was depended on vibration frequency.•The damping characteristic of soft tissue increa...

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Bibliographic Details
Published in:Human movement science 2015-12, Vol.44, p.157-167
Main Authors: Khassetarash, Arash, Hassannejad, Reza, Ettefagh, Mir Mohammad, Sari-Sarraf, Vahid
Format: Article
Language:English
Subjects:
Accelerometry
Adult
Connective Tissue - physiology
Damping
Exercise Test
Fatigue
Fourier Analysis
Gastrocnemius
Humans
Male
Muscle Fatigue - physiology
Muscle, Skeletal - physiology
Running
Running - physiology
Wavelet
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Summary:•The changes in vibration properties of the gastrocnemius muscle during prolonged running was investigated.•The vibration amplitude of soft tissue increased with fatigue.•The percent increase in vibration amplitude was depended on vibration frequency.•The damping characteristic of soft tissue increased with fatigue. Muscle tuning paradigm proposes that the mechanical properties of soft tissues are tuned in such a way that its vibration amplitude become minimized. Therefore, the vibrations of soft tissue are heavily damped. However, it has been hypothesized that the ability of muscle tuning decreases with fatigue. This study investigated the changes in vibration characteristics of soft tissue with fatigue. Vibrations of the gastrocnemius muscle of 8 runners during a prolonged run protocol on a treadmill at constant velocity (4ms−1) were measured using a tri-axial accelerometer. The vibration amplitude is calculated using the Fourier transform and a wavelet-based method was used to calculate the damping coefficient. The results showed that: (1) the vibration amplitude in longitudinal direction increased with fatigue, which may be interpreted as the decreased muscle function with fatigue. (2) The amplitude increase percent strongly depended on the vibration frequency. (3) The damping coefficient of the gastrocnemius increased with fatigue. A 1-DOF mass-spring-damper model was used in order to validate the wavelet based method and simulate the observed phenomena.
ISSN:0167-9457
1872-7646
DOI:10.1016/j.humov.2015.08.024