Sample size has been calculated to detect minimal significant effects on the variable of physical performance (SPPB): accepting an alpha risk of 0.05 and a beta risk of 0.20 in a bilateral contrast, 26 individuals are required in order to detect a difference equal to or greater than 1.5 unit in the SPPB (SD= 1.94). It has been increased the sample size in an additional 20% (losts during follow-up) and 5% (mortality). The resultant sample size is determinate in 32 individuals, who are equally randomized in both experimental and control groups.