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Exercise testing was divided in four phases: warm-up, incremental exercise, active recovery and passive recovery. HRV time series estimated from the RR sequence were averaged in the following 1-minute windows: both minutes of warm-up (WU1 and WU2), first 3 minutes of incremental exercise (EX1, EX2, EX3), last minute of exercise before peak effort (PE), 3 minutes of active recovery (AR1, AR2, AR3) and 3 minutes of passive recovery (PR1, PR2, PR3).
