The chin-up is one exercise that can be used to strengthen the biceps muscle. Th

Question

The chin-up is one exercise that can be used to strengthen the biceps muscle. This muscle can exert a force of approximately 800 N as it contracts a distance of 7.5 cm in a 74-kg male. How much work can the biceps muscles (one in each arm) perform in a single contraction? J Compare this amount of work with the energy required to lift a 74-kg person 40 cm in performing a chin-up. How much is required? J Do you think the biceps muscle is the only muscle involved in performing a chin-up? Yes No Explain.

Explanation / Answer

The work done to lift a 74 KG person 40 cm against gravity is similarly calculated, just with one more step:

W = F * D
F = M * A

W=74*9.8*0.4=290.08N

As far as the bicep being the only muscle required to do a chinup, the easiest way to test that is to act like a physicist and perform an experiment.

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