Effect of Training on Oxygen Consumption in Negative Muscular Work

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Abstract
During negative work, bicycling downhill on a motordriven treadmill, it was found in 3 young, male subjects that the oxygen consumption (V̊o2) continued to increase over a 25–50 min exercise period. The increase from the 10th to the last min of exercise was more than 25%. After 3–5 weeks of training with negative work of higher numerical work intensity, a marked decrease in V̊o2 was seen and the continuous increase in V̊o2 during the exercise period was reduced to a minimum, when the subjects worked at the same work intensity as before the training period. The direct employment of energy received by the muscles during negative work in the contraction process is discussed as a possible explanation for the reduced aerobic metabolism. Strengthening of the connective tissue during training and changes in muscle viscosity due to changes in muscle temperature are suggested as other possible factors involved in the decrease in V̊o2.

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