Figure 2

Mean ± standard deviation heart rate (HR) values calculated every minute during moderate-intensity and heavy-intensity exercise, up to volitional exhaustion (or to 40 min for moderate-intensity exercise in CTRL) in the two group of subjects (obese patients, OB; healthy controls, CTRL), in the two experimental conditions (AIR and AIR → HeO2). The horizontal dashed lines indicate the peak HR values determined during the incremental exercise. See text for further details.