Does adding a pound of muscle burn the often-quoted number of 50 calories a day? The 50-calorie-a-day number can’t be true if one makes the assumption that the muscle tissue you all ready had before adding that pound of muscle will produce the same calorie burn - i.e. all lean muscle tissue consumes 50 calories a day. A 155 pound man with 62 pounds of skeletal muscle would have to consume 3100 calories each day just to support his muscles.
A more reasonable assumption is that strength training will results in an increase in resting metabolism for existing muscle plus and an additional increase in metabolism for new muscle. From the article examining two studies Why The Confusion on Muscle and Metabolism? Wayne Wescott concludes: