Abstract
An implicit assumption, that the post-absorptive resting metabolic rate (RMR) after light physical activity frequently permitted in the determination of basal metabolic rate (BMR) would not differ substantially from that measured upon awakening, was questioned as a possible factor of overestimation in the BMR standards. The supine RMRs measured with 15 overnight fasting subjects (males, aged 20–29) 10 and 20 min after awakening were 0.91 and 0.97 kcal/kg fat-free mass/h, indicating the rise of metabolic rate with time (a 7% increase in 10 minutes). After a 10-min walk, the RMRs increased by 20% as compared to the RMR taken 10-min after awakening and remained constant. The RMRs 1 to 3 h after breakfast were essentially the same as the Japanese BMR standards. All predicted basal energy expenditure from the Japanese BMR standards, Harris-Benedict equation, Robertson-Reid standards and Boothby-Sandiford standards overestimated the post-absorptive resting energy expenditure determined after a 10-min walk by 9 to 18%. Our findings suggest a possibility that the BMRs previously determined have not been rigorously standardized, and raise questions regarding the accuracy of widely used BMR standards in predicting basal energy requirements.
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