Smith, D. A., J. Dollman, R. T. Withers, M. Brinkman, J. P. Keeves, and D. G. Clark. Relationship between maximum aerobic power and resting metabolic rate in young adult women.J. Appl. Physiol. 82(1): 156–163, 1997.—The literature is inconclusive as to the chronic effect of aerobic exercise on resting metabolic rate (RMR), and furthermore there is a scarcity of data on young women. Thirty-four young women exhibiting a wide range of aerobic fitness [maximum aerobic power (V˙o 2 max) = 32.3–64.8 ml ⋅ kg−1 ⋅ min−1] were accordingly measured for RMR by the Douglas bag method, treadmillV˙o 2 max, and fat-free mass (FFM) by using Siri’s three-compartment model. The interclass correlation (n = 34) between RMR (kJ/h) and V˙o 2 max(ml ⋅ kg−1 ⋅ min−1) was significant (r = 0.39,P < 0.05). However, this relationship lost statistical significance when RMR was indexed to FFM and when partial correlation analysis was used to control for FFM differences. Furthermore, multiple linear-regression analysis indicated that only FFM emerged as a significant predictor of RMR (kJ/h). When high- (n = 12) and low-fitness (n = 12) groups were extracted from the cohort on the basis ofV˙o 2 max scores, independent t-tests revealed significant between-group differences (P < 0.05) for RMR (kJ ⋅ kg−1 ⋅ h−1) andV˙o 2 max(ml ⋅ kg−1 ⋅ min−1) but not for RMR (kJ/h), RMR (kJ ⋅ kg FFM−1 ⋅ h−1), and FFM. Analysis of covariance of RMR (kJ/h) with FFM as the covariate also showed no significant difference (P = 0.56) between high- and low-fitness groups. Thus the results suggest that1) FFM accounts for most of the differences in RMR between subjects of varyingV˙o 2 max values and2) the RMR per unit of FFM in young healthy women is unrelated toV˙o 2 max.

  • fitness


  • Address for reprint requests: R. T. Withers, Exercise Physiology Laboratory, School of Education, The Flinders University of South Australia, GPO Box 2100, Adelaide 5001, South Australia.

  • Present address of D. G. Clark: Dept. of Medical Biochemistry, School of Medicine, The Flinders University of South Australia, GPO Box 2100, Adelaide 5001, South Australia.

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