Figure 1: Hypoxic and hypercapnic ventilatory response to the training intervention Changes of the whole sample are shown comprising high intensity interval- (HIT) [□] and Continuous Moderate Exercise Training (CMT) [○]. Mean values and standard errors for the whole sample are presented as bold lines. Hypercapnic Ventilatory Response (HCVR) significantly increased whereas Hypoxic Ventilatory Response (HVR) remained unchanged during the 4-week exercise intervention. *time effect: p<0.05 in comparison to baseline values.