Abstract
Background and Objectives Menstrual cycle may affect the training of strength and muscle size. The aim of the present study was to determine the effect of exercise volume distribution in the 2 follicular and luteal phases of the menstrual cycle on serum Insulin-like Growth Factor 1 (IGF-1) and muscle mass in women. Methods in this semi experimental study’ 20 amenorrheic women with a mean age of 22±5 years, without contraceptive use and a history of eight weeks of resistance training were selected. Each subject had 8 training sessions on one leg in the first 14 days of menstruation and 2 training sessions on the second 14 days of menstruation (training in the follicular period) and the other leg had 2 training sessions on the first 14 days of menstruation and 8 training sessions on the second 14 days of menstruation (training in the luteal period). The training protocol was consist of unilateral leg extension. Results the quadriceps Muscle diameter (according to pretest size) in follicular training (FT) (0.67±0.34 (cm)) was higher than luteal training(LT) (0.46, 0.41 cm) (P=0.012). Also, insulin-like growth factor increased in both groups (13%) regardless of the type of exercise schedule (P> 0.001). Conclusion According to this study it is recommended that follicular based training may cause more muscle hypertrophy and maximum strength than luteal based training in young amenorrheic women who do not take birth control pills.
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