Cardiac Rehabilitation

Contents. #Introduction · #Definition · #Key Concepts · #Epidemiology and Access · #Indications and Reimbursement · #Programme Structure and Phases · #Core Components · #Exercise Prescription · #Delivery Models · #Special Populations · #Rehabilitation in Heart Failure · #Rationale and Evidence · #Contradictions / Open Questions · #Connections · #Sources

Detailed pages. concepts/Cardiac-Rehabilitation-HF

Introduction

Cardiac rehabilitation is a supervised, multidisciplinary secondary-prevention service built around exercise training. It is recommended far more widely than it is reimbursed, and reimbursed far more widely than it is delivered.

Definition

Cardiac rehabilitation is a medically supervised, multidisciplinary secondary-prevention programme for patients with cardiovascular disease. The US statutory definition — physician medical director, day-to-day physician or nonphysician practitioner supervision, and all core components delivered through individualised treatment plans updated every 30 days — is narrower than the clinical definition, and it is the one that determines reimbursement. (sources/cardiac-rehab-aha-2024, rating: very high)

The European definition is broader and now unqualified. ESC 2026 defines CR as a multimodal, multidisciplinary, patient-centred intervention delivered across Phases 0–III, and states that the term should no longer carry the qualifiers "exercise-based" or "comprehensive". It elevates functioning and health-related quality of life to independent primary outcomes alongside mortality and morbidity, and applies well beyond the seven Medicare diagnoses — see #Indications and Reimbursement. (sources/CRP-ESC-2026, rating: very high)

Key Concepts

Epidemiology and Access

Indications and Reimbursement

Medicare-defined qualifying diagnoses:

The ESC 2026 list is much broader than the reimbursement list. (sources/CRP-ESC-2026, rating: very high)

Population Class / LOE
ACS and CCS I A (CV mortality, MI); I B1 (hospitalisation, VO2peak, HRQoL)
Chronic HFrEF; HFpEF I B1
Advanced HF with LVAD or after transplantation I B1
Decompensated HF, once safe IIa B1
Aortic stenosis after SAVR or TAVI I B1
ACHD with reduced fitness I B1
After ICD or CRT implantation I B1
Atrial fibrillation, including after ablation IIa B1
PAH with right ventricular dysfunction IIa B1
Cancer, especially at high CTR-CVT risk IIa B1
Frailty I B2
Withholding CR because of frailty or comorbidity III C

Benefit also extends to MINOCA, and several entries rest on functional rather than clinical endpoints. A 2021 meta-analysis of 10 RCTs in valve disease found the impact on mortality, hospitalisation and HRQoL uncertain, yet aortic stenosis after SAVR or TAVI still carries Class I B1. (sources/CRP-ESC-2026)

Programme Structure and Phases

Two conventions are in use and they are not the same. ESC 2026 describes Phases 0–III, beginning with prehabilitation; the US model describes four phases I–IV, ending with indefinite maintenance. (sources/CRP-ESC-2026, rating: very high; sources/crp-jcm-2025, rating: medium)

Phase Setting and timing Content Evidence
Phase 0 — prehabilitation (ESC only) Before a planned intervention such as elective CABG or TAVI Exercise and optimisation while waiting Multimodal prehabilitation improves short-term outcomes before elective transplantation; the evidence base is otherwise thin
Phase I — inpatient During the index admission Sitting up, upper- and lower-limb function tests, short walks, risk-factor education, psychosocial support Exercise from day 3–7 post-PCI reduces remodelling and raises LVEF; early rehabilitation within 3 days shortens stay; Phase I lowers revascularisation −20% and readmission −19% at ~1 year, dose-dependently
Phase II — early post-discharge Begins 1–4 weeks after discharge; 6–12 weeks in Europe, 6–36 visits in the US, minimum 24 sessions Supervised exercise with risk-factor control A 3-month supervised programme plus 9 months of community self-management lowered MACE and improved LVEF and 6MWD versus medical therapy alone (Xiao 2021, n=164)
Phase III — long-term outpatient Reduced supervision Consolidating the Phase II lifestyle change Sparse and inconsistent: an 8-week Phase III programme had no effect on non-fatal MI or HF hospitalisation at 5.6 years (Brawner 2017, n=230), whereas a 3-year multifactorial educational programme did reduce cardiac events (GOSPEL 2008, n=3,241)
Phase IV — maintenance (US only) Indefinite Sustaining heart-healthy behaviour Little literature; patients commonly revert after programme completion

(Table: sources/crp-jcm-2025, rating: medium)

Illness perception drives Phase II adherence. Patients who understand their condition sustain motivation longer; BIPQ scores improve early in Phase II then may fall again as awareness of chronicity raises emotional concerns (Darsin Singh 2023, n=450). (sources/crp-jcm-2025)

Core Components

The 2024 AHA/AACVPR statement defines nine core components. Strength training was separated from aerobic training as its own component, and programme quality was added as a new one. (sources/cardiac-rehab-aha-2024, rating: very high)

Component Key content
Patient assessment Comprehensive medical, functional, social and home-environment evaluation; ITP at entry; outcomes report at completion
Nutritional counselling Validated food-frequency questionnaire; DASH, Mediterranean or plant-based pattern; SMART goals; explicit dietitian referral criteria
Weight and body composition Body fat-to-lean ratio as the primary target; waist circumference the most feasible field measure; programmes have limited effect on weight overall, and HIIT is the strongest exercise lever for body composition
CVD and risk-factor management SBP <130 and DBP <80 mmHg; LDL-C <70 mg/dL, <55 mg/dL at very high risk; HbA1c <7% for most; cessation support for every current or recent smoker
Psychosocial management Validated screening for depression, stress, anxiety, loneliness and substance use; CBT and stress-management techniques; persisting depression at completion predicts higher post-CR mortality
Aerobic exercise training 3–5 days/week, 20–60 min, moderate to vigorous — see the prescription table below
Strength training 2–3 non-consecutive days/week, 40–60% 1-RM, 8–10 exercises, 10–15 reps — aimed at frailty and fall prevention
Physical-activity counselling ≥150 min/week moderate or ≥75 min/week vigorous; step-count monitoring; minimising sedentary time
Programme quality Annual assessment at system, programme and patient level; equity focus; 70% enrolment target

Exercise Prescription

Parameter Aerobic training Resistance training
Frequency 3–5 days/week — 3 supervised plus home exercise on non-CR days, ≥5 total 2–3 non-consecutive days/week
Intensity Moderate 40–59% HRR, RPE 12–13; vigorous 60–89% HRR, RPE 14–17. Do not use resting HR + 20–30 bpm or age-predicted maximum — both are too inaccurate in an individual 40–60% of 1-RM; RPE 11–13
Time and volume 20–60 min per session including warm-up and cool-down 1–3 sets × 8–10 exercises × 10–15 reps, advancing to 3 sets
Progression Lengthen by 1–5 min per session to the goal duration first, then raise intensity in 5–10% steps Add ~5% load for upper-body and 10–20% for lower-body work once the top of the rep range is comfortable
Type Treadmill, cycle, elliptical, rowing, stair climbing, arm or leg ergometry Machines, free weights, elastic bands or body weight; multijoint movements first when time is short
Goals ≥15% rise in peak VO2, ≥40% rise in peak MET, ≥10% rise in 6MWD Lean mass, strength, reduced fall risk

(Table: sources/cardiac-rehab-aha-2024, rating: very high)

ESC 2026 rejects the percentage-of-maximum paradigm. It prefers ventilatory thresholds over %HRpeak, %HRR or %VO2peak, and discourages MET-based classification because MET 4–6 may be supramaximal for many cardiac patients; thresholds can be estimated from resting and peak heart rate when gas exchange is unavailable. Low-capacity or recently decompensated patients start at 40% VO2peak and progress to VT1 (50–60%) then VT2 (65–90%). Sessions are two-thirds endurance, one-third resistance, with a weekly energy target of 1000–2000 kcal in ACS and CCS and >1000 kcal in chronic HF. In chronic HF, IMT is added at 3–5 sessions/week up to daily, 20–30 min, from 30% to 60% of maximal inspiratory pressure. HIIT is superior or more time-efficient for VO2peak but capped at IIb B1 — protocol uncertainty and absent unsupervised safety data confine it to supervised, medically cleared patients. (sources/CRP-ESC-2026, rating: very high)

Delivery Models

Special Populations

Elderly and frail patients. Traditional programmes were designed for younger post-surgical patients; older and frail patients participate less, withdraw earlier, and gain less from conventional intensive protocols. After age 70 aerobic capacity declines by >20% per decade, and the median age in home-based CR studies is ~68 years — well below the elderly post-MI population. (sources/pipeline-mi-nejm-2025, rating: very high)

PIpELINe (NEJM 2025, n=512, median age 80, 2:1 allocation) Result
Primary outcome — CV death or unplanned CV hospitalisation at 1 year HR 0.57 (95% CI 0.36–0.89), P=0.01; NNT ≈12.5
HF hospitalisation HR 0.20 (95% CI 0.07–0.56)
CV death HR 0.69 (NS)
Unplanned CV hospitalisation HR 0.48
Physical performance and QoL (SPPB, gait speed, grip strength, EQ-5D-5L) Improved at 6 and 12 months
Safety and adherence No serious adverse events; 71% compliance

Rehabilitation in Heart Failure

Full detail: concepts/Cardiac-Rehabilitation-HF.

Rationale and Evidence

Training works through central and peripheral adaptations at once: it lowers filling pressures, improves endothelial function, restores sympathovagal balance, blunts the ergoreflex, and reverses skeletal-muscle fibre-type and oxidative-capacity changes. That is why functional capacity improves even when LVEF does not. (sources/CRP-ESC-2026, rating: very high)

Evidence Population Finding
Systematic review of randomised trials Coronary heart disease Little or no effect on all-cause mortality
Meta-analysis 2023 (n=23,172) ACS and CCS Reduced CV mortality, MI and all-cause hospitalisation; no reduction in all-cause mortality or revascularisation
HF-ACTION (n=2,331) HFrEF, NYHA II–IV Supervised training plus usual care: non-significant reductions in all-cause death and hospitalisation; prespecified adjustment showed reductions in CV death and HF hospitalisation
Systematic review (n=8,728) HF Improved functional capacity, QoL and HF hospitalisation; no mortality reduction
SWEDEHEART, Medicare post-PCI registries Post-MI, post-PCI 1–2% mortality reduction per session attended, dose-dependent

(Sources: sources/crp-nejm-2024, rating: high; sources/CRP-ESC-2026, rating: very high)

The gap between the randomised and observational columns is the central interpretive problem here, and is the first contradiction below. Set against it, CR reliably improves functional capacity, psychological health, adherence, risk-factor control and return to work, and appears cost-effective. (sources/CRP-ESC-2026; sources/crp-nejm-2024)

Contradictions / Open Questions

Connections

Sources

US framework

European framework

Access, delivery and epidemiology

Special populations

Heart failure detail page