Résumé : Muscle aging is characterized by sarcopenia, characterized by reduction of muscle mass and strength. Muscle strength reduction can be explained, in part, by a decrease in muscle mass. Consequently, alternative hypothesis have been propose d based on neuromuscular alterations and their implicated mechanisms in these alterations. As the level of activity diminishes with age, it is important to distinguish changes specific to reduced activity (low muscular activity, bed rest, immobilization,...) from those due to aging. Thus, it seems that sarcopenia could be in part explained by a decreased neuromuscular activity and that physiological muscle stimulation by exercise could be a good way to delay the effects of muscular aging as well the effects of aging in general. © La Revue De Geratrie.