Resistencia a insulina, composição corporal e força muscular de homens idosos submetidos a treinamento com pesos / Insulin resistance, body composition and muscle strength in elderly men after weight training

AUTOR(ES)
DATA DE PUBLICAÇÃO

2008

RESUMO

With population longevity growth, becomes evident the necessity in establishing ways for physiological losses reduction and also, complications related to limitations and illness resulting from this process. So, this study aimed to evaluate the effect of 16 weeks of weight training (WT) on insulin resistance (IR), body composition (BC) and muscle strength (MS) in healthy over 60 year-men. Eighteen sedentary, healthy men were divided into training group (TG, n=10; 65±4 years old; 82.42±12.32 kg of body mass; 103.43±10.68 cm waist measurement; 27.56±3.31 kg/m2 of IMC) who performed 16 weeks of WT and control group (CG, n=8; 61±2 years old; 84.45±13.10 kg of body mass; 102.88±11.05 cm waist measurement; 28.49±4.32 kg/m2 of IMC) who kept in a sedentary condition during the study. The groups were evaluated at the moments pre and post WT. BC by Dual Energy X-ray Absorptiometry (DEXA) was determined. MS was evaluated by 1 repetition maximum test (1RM). IR was estimated by Homeostasis Model Assesment (HOMA) index. WT program consisted of a 10 exercises with three sets of 15 repetitions in three nonconsecutive days per week. Significant reductions (p<0,05) in percent body fat (%BF) were found for the TG (-4,73%). Significant results (p<0,05) were found in relative group changes related to total body fat (BF) and fat free mass (FFM). Significant increases (p<0,05) were also found for the TG in MS evaluated by 1RM on bench press (+41,95%), leg press (+30,15%) and arm curl (+15,83%). Significant changes on fasting glucose and insulin and on IR in both groups were not found after experimental period. WT showed to be efficient in promoting elderly BC and strength changes, which was not evident when changes on IR were analyzed. So, the results demonstrated WT importance in reducing risks related to IR development in the elderly due to, for example, its effect on body fat and muscle strength. However, the direct influence of WT on IR of this population needs to be more investigated, considering different possibilities of WT intensities and durations, and also different techniques of insulin sensibility determination

ASSUNTO(S)

weight training composição corporal força muscular resistência à insulina insulin resistance body composition elderly treinamento com peso muscle strength idosos

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