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Abstract:   (2061 Views)
Objectives: The loss of muscle mass in older adults is attributed to the impaired ability of skeletal muscle to respond to anabolic stimuli and the increased activation of proteolytic signaling pathway. With age, plasma concentrations of circulating anabolic hormones and growth factors e.g. testosterone, IGF-1 and IGFBP-3 are also diminished. Resistance training (RT) promotes positive adaptations that attenuate the deleterious effects of aging. The aim of this investigation was evaluation the effect of RT with  low (LL) versus highload (HL) that performed until the fatigue on testosterone, IGF-1, IGFBP-3  and functional adaptations  in elderly women.
Methods & Materials: 28 elderly women ( mean age 63.14±2.51) who were eligible to participate in this study were randomly assigned into three groups including: RT group with low load (RT-LL)  (30٪1RM), RT group with high load  (RT-HL)  (80٪ 1RM) and control group. Both training groups performed exercise until the fatigue. The minimum of repeat for the RT-LL  group was 20 repetitions, and for the RT-HL group was 8 repetitions. The RT program was performed for eight weeks and weekly three sessions. Testosterone, IGF-1, IGFBP-3, lower body muscular strength and muscular endurance of the subjects were measured before and after intervention.
Results: No significant changes was observed in testosterone,IGF-1 and IGFBP-3 after 8 weeks of RT (p>0.05). Both training groups significantly increased the lower body muscular strength and muscular endurance (P <0.05), and there was no significant difference between the two groups (P >0.05).
Conclusions: Based on the findings of this study, it is likely that RT-LL until the fatigue may affect performance adaptations resulting from exercise and provide an appropriate  alternative to RT-HL in elderly people.

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Type of Study: Applicable | Subject: General
Received: 2018/03/06 | Accepted: 2018/07/25

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