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Neural control of force output during maximal and submaximal exercise
A St Clair Gibson1, M L Lambert, T D Noakes
1The Medical Research Council, Department of Human Biology, University of Cape Town, South Africa. agibson@sports.uct.ac.za
Sports Medicine (Auckland, N.Z.)
|August 18, 2001
Summary
Exercise fatigue may stem from neural commands, not just muscle metabolism changes. This suggests fatigue is a protective sensory response, not a direct physiological breakdown.
Area of Science:
- Exercise Physiology
- Neuroscience
Background:
- Commonly believed peripheral fatigue originates from muscle metabolism (substrate depletion or metabolite accumulation).
- Evidence suggests neither substrate depletion nor metabolite accumulation fully explains fatigue, questioning the peripheral fatigue theory.
Purpose of the Study:
- To review the role of efferent neural command in exercise fatigue.
- To propose that neural strategies regulate exercise to prevent muscle damage.
Main Methods:
- Review of existing literature on neural control of fatigue.
- Examination of concepts like muscle wisdom, unit rotation, and teleoanticipation.
Main Results:
- Central fatigue, driven by neural command, is proposed as a primary fatigue mechanism.
- Neural strategies appear to maintain muscle reserves and inhibit exercise before irreparable damage.
Conclusions:
- Fatigue is likely a sensory manifestation of neural regulatory mechanisms, not solely a physiological state.
- Central fatigue and protective neural strategies are key to understanding exercise limitations.