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DOI: 10.1055/s-2005-837443
© Georg Thieme Verlag KG Stuttgart · New York
Gender Difference in the Proportionality Factor Between the Mass Specific V·O2max and the Ratio Between HRmax and HRrest
Publication History
Accepted after revision: November 10, 2004
Publication Date:
11 April 2005 (online)
Abstract
The maximal rate of oxygen uptake uptake (V·O2max) is an important determinant of cardiorespiratory fitness and aerobic performance. Estimation of V·O2max from body mass (BM), maximal heart rate (HRmax) and resting heart rate (HRrest) has recently been conducted in a group of well-trained men using the equation: dot VO_{2max} = BM cdot PF cdot {{HR_{max} } over {HR_{rest} }}, where PF denotes the proportionality factor between {{HR_{max} } over {HR_{rest} }} and the mass specific V·O2max. Fick principle calculations show that PF is given as the product of the mass specific resting oxygen uptake (V·O2rest) and the maximum-to-resting ratios for stroke volume and the arterio-venous O2 difference. Due to women's lower mass specific V·O2rest, a gender PF difference was hypothesised. In the present study PF was examined in a sample of 27 trained female subjects, and compared with a similar study conducted in men. Significant gender difference was observed in PF, but there was no gender difference when lean BM replaced BM in the PF calculation. Accordingly, V·O2max could be estimated indirectly by the following equation: dot VO_{2max} = BM cdot PF cdot {{HR_{max} over {HR_{rest} }}, where PF is 14.5 ml · min-1 · kg-1 for women and 15.3 ml · min-1 · kg-1 for men. Cross validation showed that the SEE was 0.22 l/min (∼ 6.8 %).
Key words
Oxygen uptake - gender - heart rate - estimation - cardiorespiratory fitness
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N. Uth
Department of Sport Science, University of Aarhus
Katrinebjergvej 89 C
8200 Aarhus N
Denmark
Fax: + 45 89 42 48 94
Email: nielsuth@idraet.au.dk