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Models to Explain Fatigue during Prolonged Endurance Cycling

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Abstract

Much of the previous research into understanding fatigue during prolonged cycling has found that cycling performance may be limited by numerous physiological, biomechanical, environmental, mechanical and psychological factors. From over 2000 manuscripts addressing the topic of fatigue, a number of diverse cause-and-effect models have been developed. These include the following models: (i) cardiovascular/anaerobic; (ii) energy supply/energy depletion; (iii) neuromuscular fatigue; (iv) muscle trauma; (v) biomechanical; (vi) thermoregulatory; (vii) psychological/motivational; and (viii) central governor. More recently, however, a complex systems model of fatigue has been proposed, whereby these aforementioned linear models provide afferent feedback that is integrated by a central governor into our unconscious perception of fatigue. This review outlines the more conventional linear models of fatigue and addresses specifically how these may influence the development of fatigue during cycling. The review concludes by showing how these linear models of fatigue might be integrated into a more recently proposed nonlinear complex systems model of exercise-induced fatigue.

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Acknowledgements

Chris Abbiss is supported by an Australian Postgraduate Award (Department of Education, Science and Training, Australia) and an Edith Cowan Excellence Award (ECU Postgraduate Scholarship Office, Edith Cowan University, Western Australia, Australia).

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    Chris R. Abbiss & Paul B. Laursen

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Abbiss, C.R., Laursen, P.B. Models to Explain Fatigue during Prolonged Endurance Cycling. Sports Med 35, 865–898 (2005). https://doi.org/10.2165/00007256-200535100-00004

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