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Abstract
The O2 uptake process at the beginning of exercise in man can be described as a process of an exponential type related to the intensity of the exercise. Its speed constant has the same value both for work performed in aerobic conditions as for very strenuous exercise involving an energy expenditure higher than can be maintained on the O2 consumption (anaerobic conditions). The half reaction time of this process is about 30 sec.
These results support the hypothesis that the intracellular oxidation processes are coupled with the splitting and resynthosis of the high energy phosphate processes in muscle.
The speed of oxidative processes in muscle does not seem to be a limiting factor to the oxygen uptake in muscular exercise. The maximum Os consumption level is presumably set by the capacity of the 02 transport from the lungs to the active tissues.
