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?

2 answers

1. 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.

   Answer ID
   539118

   Created
   April 29, 2011 3:22pm UTC

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   https://questions.llc/answers/539118

2. 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

   Answer ID
   539120

   Created
   April 29, 2011 3:26pm UTC

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   URL
   https://questions.llc/answers/539120