Article

Objective: To measure lumbar extensor strength in weight (OVW) and nonoverweight (NOVW) elderly before and after resistance exercise training (RX). Design: Descriptive, comparative study. Setting: University-based wellness center and research Participants: Eighty-four adults (age range, 60-83y) placed into 1 of 2 groups based on body mass index control (NOVW; mean BMI, 22.5kg/m(2)) or OVW (mean 29.2k g/m(2)). Subjects were then randomly assigned to either resistance exercise (RX) or nonexercising group. Intervention: Six months of total body RX and lumbar extension exercise. Main Outcome Measures: Body composition, lumbar extension strength, and
1-repetition maximum for of the training exercises. Results: Upper-body strength increased by 18.3% 17.2% for the NOVW-RX and OVW-RX groups, Lower-body strength increased by 12.7% and 19.5% for NOVW-RX and OVW-RX groups, respectively. At the OVW participants had greater total lumbar strength (1067Nm vs 714Nm) compared with the participants (P <.05). When expressed per kilogram of mass, there were no differences in baseline total lumbar sion strength. After RX, lumbar extension strength by 58% and 34% for the NOVW-RX and OVW-RX respectively (P <.05). No changes in lumbar extension, or lower-body strength were noted for the nontraining groups. Conclusions: OVW subjects were found to have absolute and similar relative, upper-body, lower-body, lumbar extension strength at baseline when compared their NOVW counterparts. Also, isolated lumbar exercise was effective in improving lumbar extensor strength OVW and NOVW persons.

Langue : ANGLAIS