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Abnormal heart rate recovery after exercise as a reflection of an abnormal chronotropic response

M Y Desai1, E De la Peña-Almaguer, F Mannting

  • 1Division of Nuclear Cardiology, Department of Radiology, Brigham & Women's Hospital, Harvard Medical School, Boston, Massachusetts 02115, USA.

The American Journal of Cardiology
|May 18, 2001
PubMed

Insights

Abnormal heart rate (HR) decline after exercise is linked to cardiac mortality. This study shows chronotropic incompetence significantly impacts HR recovery, with beta blockers playing a key role.

Area of Science:

  • Cardiology
  • Exercise Physiology

Background:

  • Abnormal heart rate (HR) decline post-exercise is associated with increased cardiac mortality.
  • Understanding HR recovery dynamics is crucial for assessing cardiac health.

Purpose of the Study:

  • Compare HR decline in coronary artery disease (CAD), normal, and transplant (Tx) patients.
  • Elucidate the relationship between HR increase/decrease during exercise and recovery.
  • Investigate the influence of beta blockers on post-exercise HR recovery.

Main Methods:

  • Bruce protocol exercise testing was performed on 100 CAD patients, 50 normal subjects, and 21 Tx patients.
  • Peak HR, HR reserve, and HR decline at 1, 3, 5, and 8 minutes were recorded.
  • Analysis included subgroups based on beta blocker use.

Main Results:

  • Significant differences in HR recovery were observed between CAD, normal, and Tx groups.
  • Beta blocker use significantly affected HR recovery within normal and CAD groups.
  • After adjusting for peak HR and HR reserve, group differences in HR recovery diminished.
  • Beta blockers significantly impact HR decline due to their chronotropic effects.

Conclusions:

  • Chronotropic incompetence is the primary factor explaining abnormal post-exercise HR recovery.
  • Beta blockers significantly influence HR recovery by affecting chronotropism.
  • HR recovery rate is highly dependent on the chronotropic response to exercise.

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