Figure 4. A and B: HF before (●) and after (■) 8-weeks of HIIE plus strength exercise. a = lower than 30-min post exercise session; b = higher than 10-, 20- and 30-min post exercise session. C and D: LF before (■) and after (●) 8-weeks of HIIE plus strength exercise. a = lower than 10 and 20-min post exercise session. E: Behavior of LF/HF ratio before (■) and after (●) 8-weeks of HIIE plus strength exercise.