Logical limitations to the "catastrophe" models of fatigue during exercise in humans

British Journal of Sports Medicine
T D Noakes, A St Clair Gibson

Abstract

A central debate in the exercise sciences is the cause of the fatigue that develops especially during high intensity exercise of short duration. The most popular theory holds that this form of exercise is limited by a peripherally based, metabolite induced failure of skeletal muscle contractile function, independent of reduced muscle activation by the central nervous system; so-called peripheral fatigue. This theory arose originally from studies undertaken by Nobel Laureate Sir Archibald Vivian Hill and colleagues in Manchester, UK in the 1920s. In turn, their interpretations were crucially influenced by the earlier 1907 findings of Sir Frederick Gowland Hopkins, Nobel Laureate for his discovery of the vitamins, and Walter Morley Fletcher. The original model of Hill and his colleagues proposed that performance during exercise of high intensity was limited by skeletal muscle anaerobiosis that developed as the result of a limiting skeletal muscle blood flow, following the onset of myocardial ischaemia. Such skeletal muscle anaerobiosis ultimately prevented the neutralization of the lactic acid that, Hill believed, initiated muscle contraction. The resulting lactic acid accumulation impaired skeletal muscle relaxation, causing the...Continue Reading

Citations

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