To provide a composition comprising an amino acid source used in combination with electrical muscle stimulation for treatment or prevention of sarcopenia, for reducing the loss of muscle morphology, for increasing the muscle morphology, and/or for improving muscle recovery after muscle atrophy, in elderly humans.SOLUTION : A composition comprises whey protein as an amino acid source, and is combined with at least one fatty acid and at least one antioxidant, where the antioxidant is a polyphenol. The composition is combined with vitamin D.SELECTED DRAWING : None