Abstract
This study aimed to assess the effects of strength training on the levels of IGF1 and of muscle strength in neurogenic and miogenic phases of sedentary older. The sample consisted of 24 elderly, voluntary, randomly divided in two groups: the experimental group (EG, n = 13; 65.62 ± 5.36 years) in the control group (CG, n = 11; 71.45 ± 5.72 years). We used the protocol of maximum repetition (Baechle & Groves, 1992) to evaluate muscle strength and maximum quimiluminescence - IMMULITE - DPC MED LAB for the IGF1. We used the Kruskal-Wallis (EG, three times) followed by multiple comparisons of Dunn; the Wilcoxon test (CG, in relation to two times) and the Mann-Whitney test (comparison inter-group). Results showed significant increase (p <0.05) in IGF1 (CGpost x EGweek20 - Δ = 54.29 ng / ml, p = 0009) and in all variables muscle strength (EGweek4 x EGweek20, Δ = 39.23% and EGpre-test x EGweek20, Δ% = 56.08%, p <0.05). We concluded that training of muscular strength results in significant increase in this variable and serum levels of IGF1, only at the miogenic phase.
Key words:
Muscle Strength; Exercise Therapy; Muscle Development; Aged; Women; IGF1; Neurogenic Phase; Miogenic Phase