Comparison of measured basal metabolic rate and estimated basal metabolic rate calculated from body weight or lean body mass among lean young Japanese women (LB429)

[Introduction]In Japan, it is considered as a big problem that more than 20% of women in their 20s have a body mass index (BMI) less than 18.5 and fall into “lean.” In day‐to‐day scenes of nutritional management in Japan, basal metabolic rate (BMR) is indispensable to estimate energy requirements. However, calculation of dietary reference intakes for Japanese (Japan‐DRI) utilizing body weight (BW) is considered to cause estimate errors among lean persons. Previous studies have shown that lean body mass (LBM) are the most important factors among body compositions to determine BMR of lean young Japanese women. [Objective]The objective of this study was to compare Measured BMR with estimated BMR calculated from BW or LBM among lean young Japanese women. [Methods]Measured BMR was measured using the IHC in lean young Japanese women (n=19, 20.5±1.3years, BMI17.7±0.8 kg/m 2 ). Estimated BMR was calculated using predicted equation based on BW (A: Japan‐DIR) or LBM (B: NIHN, C: Taguchi et al.) [Results and Conclusion]Measured BMR was significantly higher than all estimates. In addition, the regression line of B approximated the gradient where measured BMR coincides with estimated BMR. (A: r = 0.621, p < 0.001, y = 0.80x + 362; B: r = 0.680, p < 0.05, y = 1.01x + 35; C: r = 0.678, p < 0.001, y = 0.677x + 462). In conclusion, it was suggested that LBM are more useful than BW to estimate BMR of lean young Japanese women.