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Indexed/Abstracted in: Chemical Abstracts, CINAHL, Current Contents/Clinical Medicine, EMBASE, PubMed/MEDLINE, Science Citation Index Expanded (SciSearch), Scopus
Impact Factor 1,111
Online ISSN 1827-1928
McMurray R. G. 1, Gunion W. K. 1, Ainsworth B. E. 2, Harrell J. S. 3
1 Department of Physical Education, Exercise and Sport Science, University of North Carolina, Chapel Hill, NC, USA;
2 Department of Epidemiology and Biostatistics, University of South Carolina, Columbia, SC, USA;
3 School of Nursing, University of North Carolina, Chapel Hill, NC, USA
Objective. To compare the accuracy of two equations for predicting V.O2max of children using submaximal cycle ergometry.
Experimental design. Repeated measures comparing treadmill measured maximal aerobic power (V.O2max) with two methods of predicting V.O2max using cycle ergometry testing.
Participants. Thirty-three children (15 boys and 18 girls) aged 7-13 years served as subjects.
Measures. Each child completed a treadmill graded exercise test (GXT) to volitional fatigue to assess V.O2max. Each child also completed a progressive 9-min, three-stage, submaximal cycle ergometer test. Heart rates obtained during the last minute of each stage of the ergometer test were used to predict V.O2max. Predictions were based on a gender-specific modification of the PWC170 (PWCGS) and a modification of the PWC195 using a 1.17 correction factor and an age and gender-adjusted estimate of resting metabolic rate.
Results. The correlations between both submaximal tests and the GXT were significant (p<0.001); however, the correlation between the GXT and the PWC195 equation (r=0.807) was higher than the correlation between the GXT and the PWCGS equation (r=0.658). Analysis indicated that the PWCGS equation significantly under-estimated the V.O2max compared to either the GXT or PWC195 (GXT=45.0±7.1, PWC195=44.7±6.2, PWCGS=42.7±5.8 ml/kg/min; p<0.01).
Conclusions. These results suggest that although the gender-specific PWCGS method is easier to compute and may be acceptable, the modified PWC195 method is a more accurate estimate of V.O2max in children.