From: The effect of an expanded long-term periodization exercise training on physical fitness in patients with coronary artery disease: study protocol for a randomized controlled trial
Intensity
%HRR or %VO2R
%HR max
Edwards method Zone
Very light
<  30
<  57
1
Light
30–< 40
57–< 64
2
Moderate
40–< 60
64–< 76
3
Vigorous
60–< 90
76–< 96
4
Near maximal to maximal
≥ 90
≥ 96
5