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Is There a Chronic Elevation in Organ-Tissue Sleeping Metabolic Rate in Very Fit Runners?

College of Health and Welfare, J.F. Oberlin University, 3758 Tokiwamachi, Machida, Tokyo 194-0294, Japan
Department of Nutritional Science, National Institute of Health and Nutrition, National Institutes of Biomedical Innovation, Health and Nutrition, 1-23-1 Toyama, Shinjuku-ku, Tokyo 162-8636, Japan
Faculty of Sport Sciences, Waseda University, 2-579-15 Mikajima, Tokorozawa, Saitama 359-1192, Japan
School of International Liberal Studies, Chukyo University, 101 Tokodachi, Kaizu-cho, Toyota, Aichi 470-0393, Japan
Author to whom correspondence should be addressed.
Nutrients 2016, 8(4), 196;
Received: 28 November 2015 / Revised: 15 February 2016 / Accepted: 22 March 2016 / Published: 2 April 2016
It is unclear whether the resting metabolic rate of individual organ-tissue in adults with high aerobic fitness is higher than that in untrained adults; in fact, this topic has been debated for years using a two-component model. To address this issue, in the present study, we examined the relationship between the measured sleeping energy expenditure (EE) by using an indirect human calorimeter (IHC) and the calculated resting EE (REE) from organ-tissue mass using magnetic resonance imaging, along with the assumed metabolic rate constants in healthy adults. Seventeen healthy male long-distance runners were recruited and grouped according to the median \(\dot{\text{V}}\)O2peak: very fit group (>60 mL/min/kg; n = 8) and fit group (<60 mL/min/kg; n = 9). Participants performed a graded exercise test for determining \(\dot{\text{V}}\)O2peak; X-ray absorptiometry and magnetic resonance imaging were used to determine organ-tissue mass, and IHC was used to determine sleeping EE. The calculated REE was estimated as the sum of individual organ-tissue masses multiplied by their metabolic rate constants. No significant difference was observed in the measured sleeping EE, calculated REE, and their difference, as well as in the slopes and intercepts of the two regression lines between the groups. Moreover, no significant correlation between \(\dot{\text{V}}\)O2peak and the difference in measured sleeping EE and calculated REE was observed for all subjects. Thus, aerobic endurance training does not result in a chronic elevation in the organ-tissue metabolic rate in cases with \(\dot{\text{V}}\)O2peak of approximately 60 mL/min/kg. View Full-Text
Keywords: sleeping energy expenditure; organ-tissue mass; V̇O2peak sleeping energy expenditure; organ-tissue mass; V̇O2peak
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Midorikawa, T.; Tanaka, S.; Ando, T.; Tanaka, C.; Masayuki, K.; Ohta, M.; Torii, S.; Sakamoto, S. Is There a Chronic Elevation in Organ-Tissue Sleeping Metabolic Rate in Very Fit Runners? Nutrients 2016, 8, 196.

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