Withdrawal and compliance to training
Of the 48 subjects randomized to the three training groups, nine withdrew before the interventions started (Figure Representative examples of the three exercise interventions. Dotted line (‐ ‐ ‐) represents heart rate whereas solid line (–) represents oxygen uptake. Notice how the heart rate typically relates to oxygen uptake during the three interval formats. Gray area represents ≥90% of maximum. (A) HIIT 4 × 4 min running at ~95% of maximal aerobic speed (MAS) interspersed by 3 min active recovery. (B) SIT 8 × 20 s exhaustive running at ~150% of MAS interspersed by 10 s passive recovery. (C) SIT 10 × 30 s maximal running (average of ~175% MAS) interspersed by 3.5 min active recovery. During these training sessions, accumulated time ≥90% of V̇O