AbstractAIM:To examine the role of ventilatory constraint on cardiorespiratory fitness in obese adolescents.METHODS:Thirty obese adolescents performed a maximal incremental cycling exercise and were divided into two groups based on maximal oxygen uptake (VO2peak): a group presenting low (L; n=15; VO2peak: 72.9±8.6 % predicted) or normal (N; n=15; VO2peak: 113.6±19.2% predicted) cardiorespiratory fitness. Both were compared with a group of healthy controls (C; n=20; VO2peak: 103.1±11.2% predicted). Ventilatory responses were explored using the flow-volume loop method.RESULTS:Cardiorespiratory fitness (VO2peak, in % predicted) was lower in L compared with C and N and was moderately associated with the % predicted forced vital capacity (FVC) (r=0.52; p<0.05) in L. At peak exercise, end inspiratory point was lower in L compared with N and C (77.4±8.1 , 86.4±7.7 and 89.9±7.6 % FVC in L, N and C respectively; p<0.05), suggesting in L an increased risk of ventilatory constraint although at peak exercise this difference could be attributed to the lower maximal ventilation in L.CONCLUSION:Forced vital capacity and ventilatory strategy to incremental exercise slightly differed between N and L. These results suggest a modest participation of ventilatory factors to exercise intolerance.
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