Abstract
Oxygen uptake was calculated for the gastrocnemius-plantaris muscle group of the dog from measurement of venous outflow and arterial and venous oxygen concentrations before, during, and after contractions. The contractions were maximal single twitches in response to supramaximal stimuli applied to the distal stump of the cut sciatic nerve. The twitch rate was varied from 0.5 to 10/sec and the contractions were continued for 5, 10, 20, or 60 min. Oxygen uptake increased with twitch rate reaching a maximum of 20–30 times the resting level at 5 twitches/sec. There was no further increase in oxygen uptake at higher twitch rates. The excess oxygen uptake during recovery (oxygen debt) appeared to be directly related to the rate of oxygen uptake at the time the contractions were stopped (terminal oxygen uptake). The maximum oxygen debt observed in these experiments was 186 μ1/g of muscle at a terminal oxygen uptake of 188 μ1/g min.
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