Background

High intensity interval exercise (HIIE) improves cardiometabolic health outcomes in the long-term. It remains less clear how obesity influences the acute cardiometabolic adjustments arising from HIIE bouts. To analyze the effect of obesity on the time course of cardiometabolic adaptations after a HIIE session

Methods

Twenty young men, 10 with obesity (OB) (body mass index [BMI]: 34.6 ±4.4 kg / m²; age: 24 ±1yrs) and 10 normal-weight (NW) (age: 23 ± 3 yrs; BMI: 23.1 ±3.9 Kg/m²) were submitted to a single HIIE session on a treadmill composed by 3 series of 6 minutes with 6 sprints of 30 seconds, at 100% of the maximum aerobic velocity (MAV), with active recovery from 30s at 50% MAV, followed by 4 minutes of passive recovery. Blood pressure, heart rate and circulating concentrations of lipids, glucose, aspartate aminotransferase and alanine aminotransferase were measured at baseline, at the end of the session, and also at 2 and 24 hours after the session

Results

It was observed a reduction in total cholesterol after 24 hours in OB (P =0.008) group only. Changes in systolic blood pressure (Group:P <0.001, Time: P <0.001, GroupXTime: P =0.138), diastolic blood pressure (Group: P =0.034, Time: P =0.377, GroupXTime: P =0.018) and rate-pressure product (heart rate x systolic blood pressure) (Group: P =0.019; Time: P <0.001; GroupXTime: P <0.001) were significantly different in Ob compared to NW

Conclusions

Obesity influences the time course of metabolic and cardiovascular adaptations arising from a HIIE session