Changes in operational lung volumes (OLV, i.e., end-inspiratory lung volume, EILV, and end-expiratory lung volume, EELV) from rest to two levels of eucapnic voluntary hyperpnea. * indicates significant difference in EILV when compared with rest for all children; ΒΆ indicates significant difference in EILV when compared with lower level of eucapnic voluntary hyperpnea for all children, # indicates significant group difference between children with and without obesity.