Background and aim: Resistance exercises are recognized as an important part of women's fitness and fitness programs. But The effect of resistance training with different intensities on damages and muscle growth in girls is completely unclear. So The aim of this study was to investigate the effect of 6 weeks resistance training in two different intensities on selected metabolic parameters in active young girls.
Subjects and Methods: 36 active student girls (mean age 20.7 ± 1.3 years, weight 58.4± 1.3 kg, height 164.1 ± 0/9 cm, and BMI of 23.1 ± 0/5 kg/m2) were divided into three groups: resistance training High intensity (70-90% of one repetition maximum؛ n=12), resistance training Low intensity (40-60% of one repetition maximum؛ n=12) and control group(n=12). Then two experimental groups were exposed to resistance training for six weeks. Blood samples were taken before and 24 hours after the end of the protocol to measure the levels of creatine kinase, growth hormone, testosterone, cortisol and insulin-like growth factor.
Results: One-way ANOVA results showed a significant difference in growth hormone (p≤0.006), testosterone (p≤0.05) and cortisol (p≤0.03), and non-significant differences in keratin kinase (p≤0.17) and growth factor Insulin (p≤ 0.27) between 3 groups. As a result of post hoc test, showed a significant increase in growth hormone levels in resistance training groups with high and low intensity compared to control group (p≤0.007