Article

This study investigated the chronic effects of different rest
intervals (RIs) between sets on dynamic and isometric muscle strength and muscle
activity. DESIGN: We used a repeated-measures design (pretraining and
posttraining) with independent groups (different RI). Twenty-one
resistance-trained older women (66.4 +/- 4.4 years) were randomly assigned to
either a 1-minute RI group (G-1 min; n = 10) or 3-minute RI group (G-3 min; n = 11). Both groups completed 3 supervised sessions per week during 8 weeks. In each
session, participants performed 3 sets of 15 repetitions of leg press exercise,
with a load that elicited muscle failure in the third set. Fifteen maximum
repetitions, maximal voluntary contraction, peak rate of force development, and
integrated electromyography activity of the vastus lateralis and vastus medialis
muscles were assessed pretraining and posttraining. RESULTS: There was a
significant increase in load of 15 maximum repetitions posttraining for G-3 min
only (3.6%; P < 0.05). However, posttraining results showed no significant
differences between G-1 min and G-3 min groups for all dependent variables (P > 0.05). CONCLUSIONS: The findings suggest that different RIs between sets did not
influence dynamic and isometric muscle strength and muscle activity in resistance-trained older women.

Langue : ANGLAIS