期刊
AMERICAN JOURNAL OF PHYSIOLOGY-ENDOCRINOLOGY AND METABOLISM
卷 281, 期 3, 页码 E633-E639出版社
AMER PHYSIOLOGICAL SOC
DOI: 10.1152/ajpendo.2001.281.3.E633
关键词
endurance exercise; aging; resting metabolic rate
资金
- NCRR NIH HHS [5O1 RR-00051] Funding Source: Medline
- NHLBI NIH HHS [HL-39966] Funding Source: Medline
- NIA NIH HHS [AG-05705, AG-00828, AG-06537, AG-13038] Funding Source: Medline
We tested the hypothesis that resting metabolic rate (RMR) declines with age in physically active men (endurance exercise greater than or equal to3 times/wk) and that this decline is related to weekly exercise volume (h/wk) and/or daily energy intake. Accordingly, we studied 137 healthy adult men who had been weight stable for greater than or equal to 6 mo: 32 young [26 +/- I (SE) yr] and 34 older (62 +/- 1 yr) sedentary males (internal controls); and 39 young (27 +/- 1 yr) and 32 older (63 +/- 2 yr) physically active males (regular endurance exercise). RMR was measured by indirect calorimetry (ventilated hood system) after an overnight fast and similar to 24 h after exercise. Because RMR is related to fat-free mass (FFM; r = 0.76, P < 0.001, current study), FFM was covaried to adjust RMR (RMRadj). RMRadj was lower with age in both the sedentary (72.0 +/- 2.0 vs. 64.0 +/- 1.3 kcal/h, P < 0.01) and the physically active (76.6 +/- 1.1 vs. 67.9 +/- 1.2 kcal/h, P < 0.01) males. In the physically active men, RMRadj was related to both exercise volume (no. of h/wk, regardless of intensity; r = 0.56, P < 0.001) and estimated energy intake (r = 0.58, P < 0.001). Consistent with these relations, RMRadj was not significantly different in subgroups of young and older physically active men matched either for exercise volume (h/wk; n = 11 each) or estimated energy intake (kcal/day; n = 6 each). These results indicate that 1) RMR, per unit FFM, declines with age in highly physically active men; and 2) this decline is related to age-associated reductions in exercise volume and energy intake and does not occur in men who maintain exercise volume and/or energy intake at a level similar to that of young physically active men.
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