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February 8, 2026European Heart Journal

Chronotropic incompetence does not affect 6MWD improvement during cardiac rehabilitation despite high prevalence.

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Why the study?

Evidence on chronotropic incompetence is lacking across many cardiovascular disease entities, particularly following cardiac surgery, and its underestimation in clinical practice requires better understanding.

Does chronotropic incompetence affect exercise capacity and the change in exercise capacity during cardiac rehabilitation in patients with cardiovascular disease?

Population

666 inpatient exercise-based cardiac rehabilitation patients with exercise-ECG data

Comparison

Chronotropic incompetent vs non-chronotropic incompetent patients

Design

Retrospective single-center cohort study

Key result

Chronotropic incompetence was prevalent in 79.1% of cardiac rehab patients but did not significantly affect improvement in 6-minute walking distance during rehabilitation.

Authors

MAM AlbusESE Alba SchmidtGPGloria Petrasch

Discussion

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Overview

Supports similar rehab gains despite chronotropic incompetence; leaves open baseline 6MWD effects in observational cohorts.

Key Points

  • The aim was to investigate chronotropic incompetence (CI) and its impact on exercise capacity during cardiac rehabilitation.
  • Retrospective cohort analysis of patients in exercise-based cardiac rehabilitation.
  • Used exercise-ECG data to define the chronotropic index.
  • Calculated changes in 6-minute walking distance (6MWD) between patients with and without CI.
  • Applied logistic regression for CI and linear regression for the chronotropic index.
  • Adjusted for confounding factors such as age, sex, and surgical history.
  • 79.1% of patients were found to be chronotropic incompetent.
  • No significant difference in exercise capacity change between CI and non-CI patients.
  • Patients without CI had a significantly longer 6MWD at discharge (median difference 63m).
  • The chronotropic index had a significant effect on 6MWD at discharge but not on its change.
  • No significant effects were found regarding surgical access type on patient outcomes.

Structured PICO

Does chronotropic incompetence affect exercise capacity and the change in exercise capacity during cardiac rehabilitation in patients with cardiovascular disease?

P
Population
666 patients admitted for inpatient exercise-based cardiac rehabilitation between December 2022 and June 2024 with available exercise-ECG data. Median age 64 years, 76.7% admitted after surgical procedures.
I
Intervention
Chronotropic incompetence (defined as chronotropic index < 0.8)
C
Comparator
No chronotropic incompetence (chronotropic index ≥ 0.8)
O
Outcome
Change in 6-minute walking test distance (6MWD) during cardiac rehabilitation and total 6MWD at dischargesurrogate

Chronotropic incompetence is highly prevalent in patients undergoing cardiac rehabilitation but does not significantly impair the improvement in exercise capacity during the rehabilitation program.

Cite This Study

Albus et al. (2025) studied this question. Chronotropic incompetence was prevalent in 79.1% of cardiac rehab patients but did not significantly affect improvement in 6-minute walking distance during rehabilitation.

synapsesocial.com/papers/698828b90fc35cd7a88486cdhttps://doi.org/10.1093/eurheartj/ehaf784.3921
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Also Consider

Synapse has enriched 5 closely related papers on similar clinical questions. Consider them for comparative context:

  1. 1Impact of Chronotropic Incompetence and Correlation with Exercise Tolerance in Patients with Implantable Cardiac Devices Undergoing a Phase II Cardiac Rehabilitation Program Article Sidebar2024
  2. 2Chronotropic Incompetence2019 · 1 citations
  3. 3Effect of Structured Exercise Training on Chronotropic Incompetence in Patients with Heart Failure with preserved Ejection Fraction2025 · 5 citations
  4. 4Chronotropic incompetence - still on time to make a difference?2024
  5. 5Chronotropic incompetence and coronary artery disease2010 · 11 citations