The resistance training effects of different weight level during menstrual cycle in female

We examined the different effects of body mass index (BMI) level on resistance training during menstrual cycle. Thirty-six female subjects performed resistance training and subjects were divided into three groups: BMIunder, BMInorm, BMIover. Subjects completed 12 weeks of sub-maximal resistance training with 3 sets of 8–12 repetitions. Maximum isometric force test was measured before and after training in the follicular phase (FP) and the luteal phase (LP). Maximum isometric force of whole groups (BMIunder, BMInorm, BMIover) was significantly increased both FP and LP after 12-week resistance training. Maximum isometric force after training and absolute increase value in BMInorm and BMIover were no significantly different between FP and LP. However, significant different of maximum isometric force after training (FP, 79.08±11.60; LP, 84.05±12.38) and absolute increase value (FP, 9.63±5.47; LP, 15.13±6.06) were found between FP and LP just by BMIunder. We suggest that if muscle strength is measured in the FP (LP) before training and then they should be measured same phase, such as FP and LP after training and BMIunder can be influenced muscle strength in LP.