Age-related decline on rate of force development and the effect of resistance training in older women
DOI:
https://doi.org/10.11606/issn.2317-0190.v16i1a103030Keywords:
Muscle Strength, Aging, weight liftingAbstract
The present study had the following objectives: a) to examine the age-related differences in the rate of force development (RFD) obtained at different instants of time and the peak RFD (PRFD) for the elbow flexors; and b) to verify the effect of weight training (WT) on those variables for elderly women. For the cross-sectional analysis 40 women were separated into an older group (OG; 64.9 ± 5.5 years; n= 20) and a younger group (YG; 20.7 ± 2.3 years; n= 20). To verify the effect of WT the OG was separated into a training group (TG; n=8) and a control group (CG; n= 10). The peak RFD (PRFD) was determined as the steepest slope of the curve for the first 200ms relative to the beginning of the contraction. The RFD values for the time intervals of 0-50; 0-100; 0-150 and 0-200ms were also obtained. The WT protocol was carried out for eight consecutive weeks, with three weekly sessions, with intensity between 10 and 12 repetitions maximum and moderate execution speed. The Older group showed a lower RFD (between -33.2 and -24.3%) and PRFD (-36.3%) when compared to the Younger group. Even though the WT may have resulted in the increase of the different RFDs between 7.5 and 18.5%, a significant interaction between Group vs. Time was observed only for the RFD between 0 and 150ms. In conclusion, the aging process can negatively affect the capacity to rapidly exert muscular force. A WT routine characterized by moderate speed did not result in any significant increase in the different RFDs in older women who were previously active.
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