Effect of stretch on O2 consumption of resting and active frog sartorius muscle

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Abstract
Oxygen consumption and resting and developed tension were measured simultaneously while the length of the muscle was increased by known increments. The Qo2 of resting muscle increased about 1% for each 1% extension beyond the relaxed length. Both resting tension and length were directly related to Qo2. In a stimulated muscle, Qo2 and frequency of contraction showed a highly significant correlation. The Qo2 of a stimulated muscle increased as the length and total tension (developed plus resting) increased. Neither Qo2 nor the increment in Qo2 above the resting level correlated significantly with developed tension. These latter findings differ from the results predicted from heat-liberation experiments. The results found here are not markedly different from those we found in heart muscle.