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Shock Transmission and Fatigue in Human Running
Journal of Applied Biomechanics
|January 26, 2017
Summary
Fatigue increases shock waves during foot strike in runners. This finding suggests a link between fatigue, shock wave transmission, and the development of running injuries.
Area of Science:
- Biomechanics
- Exercise Physiology
Background:
- Running injuries are common, with shock wave transmission implicated in their etiology.
- Understanding factors that influence shock wave generation is crucial for injury prevention.
Purpose of the Study:
- To investigate the impact of fatigue on shock waves produced during the foot strike in runners.
- To determine if fatigue alters the biomechanics of running in a way that affects impact forces.
Main Methods:
- Twenty-two subjects ran on a treadmill for 30 minutes at a speed near their anaerobic threshold.
- Fatigue was assessed by monitoring end-tidal CO2 pressure.
- Accelerometers placed on the tibial tuberosity measured peak acceleration during foot strike.
Main Results:
- Approximately 50% of subjects reached a state of fatigue by the end of the test.
- A significant increase in peak acceleration (shock wave intensity) was observed when fatigue occurred.
- This indicates a direct correlation between the onset of fatigue and heightened impact forces.
Conclusions:
- Fatigue is clearly associated with increased intensity of heel strike-induced shock waves.
- These findings highlight a potential mechanism linking running fatigue to injury risk.
- Interventions aimed at managing fatigue may be important for mitigating running-related injuries.
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