Efeito de 12 semanas de treinamento com pesos sobre a força muscular e a composição corporal de mulheres idosas

AUTOR(ES)

Matheus Amarante do Nascimento

FONTE

IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia

DATA DE PUBLICAÇÃO

30/07/2009

RESUMO

Introduction: Reductions in strength and alterations on body composition, observed with normal aging, may compromise the quality of life of older people. Having said that, regular systematic practice of resistance exercises has been recommended, especially for older adults. Objective: To evaluate the effects of 12 weeks of resistance training in strength and body composition of healthy and sedentary older women. Methods: Twenty-two older women (66.3 ± 4.8 years, 60.7 ± 9.1kg, 156.1 ± 5.9cm) were assigned to a resistance training program, during 12 weeks, on three nonsequential days per week, while other twenty-two older women (66.4 ± 4.0 years old, 63.3 ± 7.5kg, 155.5 ± 5.8cm) composed the control group, who undertook a twice-week stretching exercise program, during the same period. One repetition maximum (1-RM) for the vertical press, leg extensors and arm curl exercises was used for strength measurements. Body composition was measured by dual energy xray absorptiometry, determining fat mass, lean body mass and bone mineral content. Repeated-measures analysis of variance (ANOVA two-way) was performed to compare strength and body composition mean differences between groups before and after the intervention. Where appropriate, the Scheffé post-hoc procedure for multiple comparisons was performed to locate the source of significant differences in means. An _-level of 0.05 was considered statistically significant. Results: No significant differences were found for any of the body composition components and none for 1-RM arm curl between and within groups (P>0.05). On the other hand, a time-group interaction was identified, elucidated by a significant strength increase for the training group over the vertical press (~12%) and leg extension exercises (~13%). Conclusion: The results suggest that a 12-week resistance program seems to be enough to improve strength of major muscle groups, regardless with low impact over body composition, in older women.

ASSUNTO(S)

treinamento com peso para idosos massa muscular - avaliação aptidão física em idosos weight training for seniors body composition analysis physical fitness for the aged

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