Mixed
High-intensity interval training (HIIT) is relatively safe for patients with coronary artery disease or heart failure when administered within supervised cardiac rehabilitation settings, with a major adverse cardiovascular event rate of 1 per 17,083 training sessions.
If you have stable heart disease or heart failure, high-intensity interval training is likely safe when done in a supervised cardiac rehab program. The risk of a serious heart event is extremely low (about 1 in 17,000 sessions). Do not attempt this unsupervised; ensure your condition is stable and you are monitored by cardiac staff.
HIIT has shown a relatively low rate of major adverse cardiovascular events for patients with coronary artery disease or heart failure when applied within CR settings.
Why this rating
Systematic review of 23 studies with 1,117 participants; high-quality evidence for safety profile, though generalizability is limited to stable, supervised populations.
Source
High‐Intensity Interval Training for Patients With Cardiovascular Disease—Is It Safe? A Systematic Review
Michael A. Wewege et al. · Journal of the American Heart Association · 2018
DOI 10.1161/jaha.118.009305
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