Human missions to Mars is one of the long term objectives of the Space exploration. Long periods of stay in weightlessness produce a series of alterations: loss of bone calcium takes place and produces osteoporosis, as well as there is a decrease in the intramuscular tension and muscular atrophy (Greenleaf, 1989; Lambertz, et al. 2000; Zange, et al. 1997), that require adaptation of the human body (Nicogossian, et al. 1994). The development of the instrument MARES is then a must in order to provide the scientific community with a tool to study muscular atrophy in weightlessness and new countermeasures are being designed. The objective is to evaluate the performance of an ergometer and to report the evaluation results of a population testing carried out with MARES system.
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