did not observe any difference of pulmonary functions between lean and obese children, despite a higher prevalence of respiratory symptoms that may occasionally impair cardiorespiratory fitness in obese youth 6. It is only among extremely obese children that the lower CRF can partly result from impaired lung function, with decreased expiratory reserve volume and functional residual capacities due to their lower chest wall and lung compliance 2-5.
This is mainly because of the increased effort required to move their larger body mass and carry an excessive amount of body fat 1. Obese children and adolescents usually have lower overall physical abilities and especially lower cardiorespiratory fitness (CRF) when compared to their normal-weight peers. Cardiorespiratory fitness in obese children and adolescents
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