Anaerobic Metabolic Influences on Oxygen Uptake Behavior

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Journal of Strength and Conditioning Research


metabolism, energy production, muscle power output


Both oxygen uptake kinetics at the start of exercise and the plateau of maximal oxygen uptake upon heavy physical exertion are greatly influenced by circulatory lag time, oxygen diffusion limitations, or perfusion of muscle by maximal cardiac output. Local muscle factors may also influence oxygen uptake. It is known that the energetic status of the cell, the ATP/ADP ratio, is a stimulus for both aerobic and anaerobic energy production. Upon activation of the motor unit, anaerobic energy production could explain an immediate energy fulfilling role in working muscle that precedes the exponential increase in oxygen uptake. When a fully activated anaerobic energy system supplies ATP, it could rob muscle mitochondria of an important start-up signal and thereby slow oxygen uptake. Evidence suggests that some anaerobic metabolites then act to stimulate mitochondrial activity. In either case, oxygen uptake would be influenced by the anaerobic metabolic system.


© 1995 National Strength and Conditioning Association