Asked by Erica L


During a workout, a person repeatedly lifts a 13 lb barbell through a distance of 1.5 ft. How many "reps" of this lift are required to burn off 100 Cal?
Answered by drwls
The efficiency for converting energy to work in muscles is not 100%. It is typically in a 18% to 26% range and varies with the individiual and the muscle.

See
http://en.wikipedia.org/wiki/Food_energy

They may expect you to assume 100% efficiency to answer your question. If so, "they" (whoever prepared your course material) are very wrong.
Answered by drwls
Since the body consumes food energy at a "1 MET" level (which also varies with the individual) even when NOT doing work, if you wait long enough, zero reps are necessary to burn 100 Calories
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