Table 2

Red-amber-green system designed to evaluate the three high-intensity interval training protocols

RedAmberGreen
Dose reductionIf ≤50% of the total training duration is completedIf 50%–85% of the training duration is completedIf ≥85% of the training duration is completed
Specific dose reduction for 4×4 minIf HR has been above 85% of max <15% of the time during the intervals (<2:20)If HR has been above 85% of max 15%–24% of the time during intervals (2:20–3:50)If HR has been above 85% of max ≥25% of the time during intervals (≥3:50)
Specific dose reduction for 6×1 minIf the intensity must be downgraded ≥10% in five or more of the intervalsIf the intensity must be downgraded 10% in 3–4 of the intervalsIf the intensity must be downgraded 10% in <3 of the intervals
Specific dose reduction for 10-20-30If HR has been above 85% of max <15% of the time during the intervals (<2:15)If HR has been above 85% of max 15%–24% of the time during intervals (2:15–3:40)If HR has been above 85% of max ≥25% of the time during intervals (≥3:40)
Likert scale
(tolerability)
1–23–45+
Adverse eventsIf the participant experiences angina, must stop the training due to any adverse event or has ST depression or arrhythmia on the post-training ECGIf ≥3 adverse events are registered during the training sessionIf ≤2 adverse events are registered during the training session
  • HR, heart rate .