The purpose of this study was to determine the effects of a short-term training with elastic resistance on muscle mass
of healthy and untrained older adults. The results suggest no effects of the 8-week training program for upper and
lower body muscle mass in untrained older adults. The first systematic review to analyze treatment affects
for LBM across multiple training dosages and potential mediating variables was the study MD Peterson, A Sen and
PM Gordon [12]. The pooled estimate of LBM change from baseline to post intervention (81 treatment cohorts; 49
studies) was 1.1 Kg (95 % CI = 0.9-1.2 Kg; p < 0.001). By using multiple meta-regression, a strong association was
determined between the volume of training and the magnitude of the LBM change, with higher volume (total number
of sets performed per session) interventions being associated physiological adaptations on muscle mass are also respond
to intensity mode.
with greater LBM increase. Volume ranged from 7 to
39 total sets per session and the majority of included
studies conformed to the American College of Sports
Medicine recommendations (i.e., 8-10 exercises for one to
two sets of full-body exercises). Regarding the volume of
training as a predictor of LBM, the present study performed
14 and 21 total sets on first and second four-week period,
respectively. These two values are within the range of volume
training identified by MD Peterson, A Sen and PM
Gordon [12] as a predictor of changes in LBM, but no
significant effects on muscle mass in the group x time interaction
were show after resistance training. Although the
present study has employed a good volume of training, the