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Fatigue and soft tissue vibration during prolonged running.
Arash Khassetarash1, Reza Hassannejad1, Mir Mohammad Ettefagh1
1Department of Mechanical Engineering, University of Tabriz, Tabriz, Iran.
Human Movement Science
|September 12, 2015
Summary
Muscle tuning minimizes soft tissue vibration, but fatigue may impair this. This study found increased vibration amplitude and damping in the gastrocnemius muscle with fatigue during running, indicating reduced muscle function.
Area of Science:
- Biomechanics
- Human Physiology
- Sports Science
Background:
- The muscle tuning paradigm suggests soft tissues minimize vibration amplitude for optimal damping.
- Fatigue is hypothesized to decrease the muscle's tuning ability, altering vibration characteristics.
Purpose of the Study:
- To investigate how muscle vibration characteristics change with fatigue.
- To assess the impact of prolonged running on gastrocnemius muscle vibration and damping.
Main Methods:
- Vibration analysis of the gastrocnemius muscle in 8 runners during a constant velocity treadmill run.
- Utilized a tri-axial accelerometer to measure vibrations.
- Applied Fourier transform for amplitude calculation and a wavelet-based method for damping coefficient determination.
Main Results:
- Longitudinal vibration amplitude of the gastrocnemius muscle increased with fatigue, suggesting decreased muscle function.
- The percentage increase in amplitude was frequency-dependent.
- The damping coefficient of the gastrocnemius muscle also increased with fatigue.
Conclusions:
- Muscle fatigue alters vibration characteristics, specifically increasing amplitude and damping.
- Findings support the hypothesis that muscle tuning ability decreases with fatigue.
- The study provides insights into the physiological changes associated with running fatigue.
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