INTRODUCTION: The Menstrual cycle influences change physical and psychological condition and performance in female athletes. Previous studies have reported that increased stress and anxiety during the luteal and menstrual phases, as well as decreased agility performance, endurance performance, intermittent endurance performance. 8-hydroxy-2-deoxy-guanosine (8OHdG) excreted into the urine is a marker of oxidative stress, and it has been reported to be associated with fatigue, psychological stress, and exercise. It has also been reported that 8OHdG changes with the menstrual cycle. However, it is unclear how the training phase (competitive phase, preparation phase, transition phase) influences 8OHdG with the menstrual cycle in female athletes. Thus, the purpose of this study was to investigate the effect of training phase on the 8OHdG with menstrual cycle in female athletes. METHODS: 17 female competitive collegiate athletes participated in this study. We conducted the measurements during competitive phase and preparation phase of menstrual phase, follicular phase and luteal phase. Subjects were taken their urine on the day of measurement. First morning urine sample was collected. The 8OHdG concentration was measured using enzyme-linked immunosorbent assay. RESULTS: The urinary 8OHdG concentration was significantly higher during competitive phase than during preparation phase (P<0.05). However, the urinary 8OHdG concentration did not show significant change with menstrual cycle. 2-way ANOVA was used to determine the effect of training phase on the urinary 8OHdG changes with menstrual cycle, and no interaction was found, but there was a main effect of training phase (p<0.05). CONCLUSION: The results of this study showed that the urinary 8OHdG level with training phase but not with menstrual cycle. There was also no effect of training phase on the 8OHdG with menstrual cycle in female athletes.
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