Özet:

The effect of the change in estrogen hormone related to the menstrual cycle on bone mineral density was investigated. The study consisted of 23 physically active young women with a mean age of 20.65±1.87 years, 1.62±0.06 height, 55.61±8.805 kg. After the menstrual cycle phases were determined, bone mineral density (BMD) (T score of the vertebrae L1-L4 and femoral neck regions and BMD (g/cm2) values) were measured in each phase. The obtained data was used in the SPSS 21.0 package program, with repeated measures analysis of variance (ANOVA). The confidence interval was chosen as 95% and values below p<0.05 were considered statistically significant. It was determined that the mean of the interphase mean of the T score and BMD (g/cm2) values of the vertebra L1-L4 and femoral neck regions of the participants did not differ according to time. However, when the T score values of the regions were examined, it was determined that the L1-L4 region and the femur length had the lowest mean in the middle luteal phase compared to the other phases. When the BMD (g/cm2) values were compared, it was found that L1-L4 had the lowest mean in the middle luteal, while the femur length had the lowest mean in the ovulation and middle luteal phases compared to the other phases. It is suggested that some phases of the menstrual cycle in young women affect bone mineral density and that calcium supplements should be used during these periods for bone health..