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The physiological regulation of pacing strategy during exercise
  1. Ross Tucker (ross.tucker{at}mweb.co.za)
  1. UCT/MRC Research Unit for Exercise Science and Sports Medicine, South Africa
    1. Timothy D Noakes (timothy.noakes{at}uct.ac.za)
    1. UCT/MRC Research Unit for Exercise Science and Sports Medicine, South Africa

      Abstract

      The regulation of the pacing strategy remains poorly understood, since much of classic physiology has focused on the factors that ultimate limit, rather than regulate exercise performance. When exercise is self-paced and work rate free to vary in response to external and internal physiological cues, then a complex system is proposed to be responsible for alterations in exercise intensity, possibly through altered activation of skeletal muscle motor units. The present review evaluates the evidence for such a complex system by investigating studies where interventions such as elevated temperature, altered oxygen content of the air, reduced fuel availability and misinformation about distance covered have resulted in alterations to the pacing strategy. The review further investigates how such a pacing strategy might be regulated for optimal performance, while ensuring that irreversible physiological damage is not incurred.

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