Comparison of Association Between Physical Activity and Resting Metabolic Rate on Korean Young and Middle‐Aged Adults

Purpose The purpose of this study was to investigate the correlation of body composition, RMR, and PA between Korean young and middle‐aged adults. Methods The total subjects were fifty‐three [male n=23, female n=30], thirty‐four healthy young adults [male n=18, female n=16] and nineteen middle‐aged adults [male n=5, female n=14]. All participants measured body composition and Resting metabolic rate (RMR) after overnight fasting (≥8h). The investigation of physical activity was using a Korean version of the WHO Global Physical Activity Questionnaire (GPAQ). Results Body composition did not present a significant difference between young adults and middle‐aged adults. The whole‐body bone mineral density (BMD) and bone mineral contents (BMC) was significantly lower in middle‐aged adults. Total blood cholesterol (TC) and blood glucose were significantly higher in middle‐aged adults (TC; 195.21 ± 43.34, Glucose; 103.57 ± 12.61 mg/dL). The RMR was significantly lower in middle‐aged adults (1619.57 ± 290.28 kcal/day) than young adults (1894.37 ± 405.00 kcal/day). In the middle‐aged adults physical activity (PA). PA (METs, min, EE) has inverse correlations with fat mass (FM, kg and %), and blood TG level in young adults. The middle‐aged adults indicate that PA has a significant positive correlation with lean body mass (LBM), FM (%), and RMR. Furthermore, PA EE also shows significant interrelatedness with BMC among the middle‐aged adults. Conclusion These results demonstrate high levels of PA preserve LBM and RMR in middle‐aged adults, furthermore, young adults demanded more PA to induce change in body composition. Support or Funding Information This work i s supported by the Ministry of Education of the Republic of Korea and the National Research Foundation of Korea (NRF‐2019S1A5B8099542).