Fig. 1From: The feasibility of implementing high-intensity interval training in cardiac rehabilitation settings: a retrospective analysisCompliance to the high-intensity intervals of the high-intensity interval training protocol. “Does not comply” refers to a mean HR during classes < 85–95% HRpeak; “Complies” refers to a mean HR during classes with 85–95% HRpeak; “Exceeds” refers to a mean HR > 95% HRpeakBack to article page