Oxygen cost for cycling as related to leg mass in males and females, aged 20 to 80
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2000-05-01
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Neder, J. A.
Nery, L. E.
Andreoni, S.
Sachs, A.
Whipp, B. J.
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In order to evaluate the determinants of the metabolic cost for cycle ergometry, we analyzed the relationship between (V)over dot O-2 and leg mass (LM) and total body mass (TBM) in 71 randomly-selected sedentary subjects (34 men), aged 20 to 80. Participants performed constant work rate (WR) tests at 0, 25, and 50 W (at 60 rpm) for 6 minutes in a randomized sequence: gross (V)over dot O-2, gross efficiency, and work efficiency were related to TBM and LM as assessed by dual energy x-ray absorptiometry. We found that gross (V)over dot O-2, and gross efficiency were more strongly related to LM than TBM but work efficiency values were independent of both (P > 0.05), Significantly higher values of (V)over dot O-2/TBM were found in subjects with large LM/TBM ratios and vice-verse; (V)over dot O-2/LM, however, did not change with anthropometric characteristics. Gross (V)over dot O-2 (mL/min) was predicted by a LM-based equation (10.6 [WR, W] + 16.8 [LM, kg] +75) with a mean error below 5%: this equation predicted the cost more accurately than previous TBM-based formulations (P < 0.01). We conclude that leg mass actually provides the preferred frame of reference for predicting the oxygen cost for cycle ergometry at 60 rpm in sedentary subjects, independent of age or gender.
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International Journal of Sports Medicine. Stuttgart: Georg Thieme Verlag, v. 21, n. 4, p. 263-269, 2000.