Study Duration (weeks) Exercise modality HIIT MICT Exercise intensity (%max) (interval: rest) Frequency (days/week) Exercise time per week (min) Attendance rate, dropouts and adverse events Exercise intensity (%max) (interval: rest) Frequency (days/week) Exercise time per week (min) Attendance rate, dropouts and adverse events Benda 12 Cycle Maximal workload: 10 × 2.5 min30% Maximal workload2 70 Attendance NR; (16%); adverse: NR 60-75% Maximal workload 2 60 Attendance NR; (16%); adverse: NR Besnier 3.5 Cycle 80% PPO 5 150 ; ; 60% PPO 5 150 Attendance: 100% ; a Cardozo 16 Running 2 min 90% HRmax : 2 min 60% HRmax 3 120 Attendance: NR; dropouts: NR; 70-75%HRmax 3 120 Attendance: NR; dropouts: NR; Currie 12 Cycle PPO (30s traning, 30 s rest)2 80 Attendance: NR; dropouts: NR 58% PPO 2 80-100 Attendance: NR; dropouts: NR; Currie 24 Cycle 121% PPO 2 120 Attendance: NR; 78% PPO 2 120 Attendance: NR D ; Ellingsen 12 Running or cycle 90-95%HRmax ; 3 min 60-70% HRmax NR NR ; ; 60-70%HRmax NR NR ; ; Freyssin 8 Running or cycle 80% maximal power 5 168 ; ; 50% maximal power 5 360 ; ; Hornikx 12 Running or cycle 80% Wpeak; 40% Wpeak3 99 Attendance: NR; (10%); (10%) 50%Wpeak 3 180 Attendance: NR; (10%); (33%) Jaureguizar 8 Cycle 105-135% VO2peak 3 120 ; ; 65-70% VO2peak 3 120 ; ; Koufaki 24 Cycle 100% VO2peak 3 120 ; (6%); (6%)40-60% VO2peak 3 120 ; ; Rognmo 10 Running 80-90% VO2peak ; 50-60% VO2peak 3 99 ; 50-60% VO2peak 3 123 ; ; Villelabeitia 8 Cycle 105-135% VO2peak 3 120 ; ; 65-70% VO2peak 3 120 ; ; Villelabeitia 8 Cycle 108-126% VO2peak 3 120 ; ; 60-70% VO2peak 3 120 ; Warburton 16 Running or climb stairs 90% heart rate/VO2 reserve 2 60 Attendance: NR; ; adverse: NR 65% heart rate/VO2 Reserve 2 60 Attendance: NR; ; adverse: NR Wisløff 12 Running 90-95% VO2peak; 50-60% VO2peak3 114 ; ; 70-75% VO2peak 3 141 ; ;