Gas exchange during exercise in obese children |
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Authors: | S. Zanconato E. Baraldi P. Santuz F. Rigon L. Vido L. Da Dalt F. Zacchello |
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Affiliation: | (1) Department of Paediatrics, University of Padova, Via Giustiniani 3, I-35128 Padova, Italy |
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Abstract: | Twenty-three obese children, aged 9 to 14 years, ranging in percentage overweight from 26% to 83% (median 51.6%±16.3%), and 37 normal-weight children, matched for sex, age and height, performed a maximal exercise test on a treadmill. Cardiorespiratory performance was assessed by determination of the ventilatory anaerobic threshold (VAT) expressed in ml O2/min per kg and as a percent of maximal oxygen uptake (% VO2max). VAT and VO2max related to body weight were significantly lower (P<0.01) in the obese than in the normal-weight children. VAT % VO2max was similar in the two groups. A significant correlation was found between VAT and VO2max both in the obese (r=0.85) and in the control groups (r=0.79). The habitual level of physical activity was lower in the obese subjects compared to the control subjects (P<0.001). In conclusion our study shows that physical fitness of overweight children is quantitatively lowered and that it can be assessed by VAT. VAT does not require a maximal test and is particularly useful in the ergometric study of subjects with exercise intolerance.Abbreviations AT anaerobic threshold - HR heart rate - VAT ventilatory anaerobic threshold - VCO2 carbon dioxide output - VE ventilation - VO2 oxygen uptake - VO2max maximal oxygen uptake |
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Keywords: | Obesity Children Exercise test |
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