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01.08.2011 | Original Article | Ausgabe 8/2011

European Journal of Applied Physiology 8/2011

Prediction of oxygen uptake during over-ground walking in people with and without Down syndrome

Zeitschrift:
European Journal of Applied Physiology > Ausgabe 8/2011
Autoren:
Stamatis Agiovlasitis, Robert W. Motl, Sushant M. Ranadive, Christopher A. Fahs, Huimin Yan, George H. Echols, Lindy Rossow, Bo Fernhall
Wichtige Hinweise
Communicated by Susan A. Ward.

Abstract

The reduced gait stability and aerobic fitness of people with Down syndrome (DS) may increase their rate of gross oxygen uptake (gross-VO2) during over-ground walking. If so, the ACSM equation predicting gross-VO2 from speed may not be appropriate and an equation specifically for these individuals may be needed. This study therefore examined whether the relationship between gross-VO2 and speed differs between individuals with and without DS during over-ground walking and attempted to develop a gross-VO2 prediction equation for people with DS. Gross-VO2 was measured in 18 persons with DS (24.7 ± 6.8 years; 8 men) and 22 persons without DS (25.9 ± 4.8 years; 9 men) at rest and during five over-ground walking trials, each lasting 6 min, at 0.5, 0.75, 1.0, 1.25, and 1.5 m/s. Multi-level modeling with random intercepts and slopes demonstrated significant effects of speed, group, group-by-speed interaction, and speed squared (P < 0.001). In each group, actual gross-VO2 did not differ from gross-VO2 predicted by the regression equation across speeds. Bland–Altman plots showed somewhat greater variability in the difference between actual and predicted gross-VO2 for participants with DS. Mean absolute error of prediction was 10.75 and 10.67% for participants with and without DS, respectively. In participants with DS, the ACSM formula under-estimated gross-VO2 across speeds, whereas, in participants without DS, only at 1.5 m/s (P < 0.001). Therefore, individuals with DS show altered curvilinear gross-VO2 to speed relationship during over-ground walking. The present regression equation appears to offer accurate prediction in people with DS and could be used for prescribing over-ground walking intensities.

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