직업 여성발레무용수의 신체조성 및 식욕조절호르몬의 변화

Abstract

This study investigated the changes in body composition, energy metabolism, and appetite-regulating hormones in professional female ballet dancers before and after three days of ballet performances. The subjects were 43 professional female ballet dancers in Korea. For body composition, the body mass index (BMI), percent body fat (%BF), lean body mass (LBM), and total body water (TBW) were evaluated. For blood analysis, the serum levels of ghrelin, leptin, and insulin were examined. The body composition measurements and blood sampling were conducted one day before the start of the performances and then seven days after the end of the performances. The calculations of energy intake (EI) and expenditure (EE) were based on journals that were self-recorded for 14 days by the subjects, using the 24-hour recall method. For statistical analysis, the independent sample t-test was applied (p＜.05). The results showed no significant change in %BF, but the BMI, LBM, and TBW increased significantly in the post-performance measurement. Energy metabolism results showed significant changes in both the EI and the EE. Ghrelin and leptin levels showed significant increases after the performances. In conclusion, the negative energy balance persisted in the subjects even after a significant increase in the EI after the end of the performances. Ballet dancers should address the problem of severe energy imbalance and its negative effects in their health.