Efficiency of Muscle Work

In addition to changes in SPA, there is also evidence that changes in the efficiency of muscle work also contribute to adaptive changes in energy expenditure. Indeed in experiments of forced changes in weight in which subjects maintained body weight at 10% above or 10% below their habitual body weight, changes in muscle work efficiency could account for a-third of the change in daily energy expended in physical activity. These findings are consistent with other reports of an increase in skeletal muscle work efficiency (i.e., decreased thermo-genesis) after experimentally-induced weight reduction or in chronically undernourished subjects. Instead, changes in muscle work efficiency could account for one-third of the change in daily energy expended performing physical activity. These findings are consistent with other reports of an increase in skeletal muscle work efficiency (i.e., decreased thermogenesis) after experimentally induced weight reduction or in chronically undernourished subjects.

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