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عمومی::
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Because muscle tissue is metabolically active 24 hours a day, the 5-pound-per-decade decrease in muscle mass typically results in a reduction in resting metabolic rate of 3 percent per decade (Keys et al. 1973).
A lower resting metabolic rate means that fewer calories are burned on a daily basis; therefore, more calories are stored as body fat.
Due largely to the reduction in resting metabolic rate, the 5-pound-per-decade muscle loss is accompanied by a 15-pound-per-decade (~7 kg) fat gain.
This large elevation in resting metabolic rate is due to the muscle microtrauma caused by resistance exercise and the resulting muscle remodeling processes that require relatively large amounts of energy for protein synthesis and tissue building.
At a daily energy cost of 9 calories per pound, 3 pounds more muscle increases resting metabolic rate by almost 30 additional calories every day.
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