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- Title
Exercise‐based cardiac rehabilitation is associated with a normalization of the heart rate performance curve deflection.
- Authors
Heber, Stefan; Sallaberger‐Lehner, Marina; Hausharter, Maria; Volf, Ivo; Ocenasek, Helmuth; Gabriel, Harald; Pokan, Rochus
- Abstract
The heart rate (HR) rises with increased power output, whereby in most healthy individuals, the slope of HR levels off with higher intensity. This corresponds to a downward deflection of the heart rate performance curve (HRPC). Conversely, in patients after myocardial infarction, an upward HRPC deflection is frequently observed that is especially pronounced in patients with compromised left ventricular ejection fraction. To investigate whether regular endurance training during cardiac rehabilitation might normalize HRPC, data of 128 male patients were analyzed. All patients performed three exercise tests: at baseline, after 6 weeks, and after 1 year. Ninety‐six patients exercised regularly according to guidelines for 1 year (training group, TG), and 32 stopped after 6 weeks (control group, CG). Similarly, upward‐deflected HRPCs were observed at baseline and after 6 weeks in both groups. After 1 year, TG patients had less upward‐deflected HRPCs compared with CG ones, corresponding to a partial normalization. Greater changes in HRPC deflection were associated with larger improvements in cardiorespiratory fitness. Our results might indicate improved myocardial function due to long‐term rehabilitation. Further, HRPC alterations over time should be considered when prescribing exercise intensities using a target HR, as deflection flattening might render the intensity of corresponding exercise insufficient.
- Subjects
MYOCARDIUM physiology; ENDURANCE sports training; EXERCISE physiology; EXERCISE tests; CARDIAC rehabilitation; HEART rate monitoring; CARDIOPULMONARY fitness
- Publication
Scandinavian Journal of Medicine & Science in Sports, 2019, Vol 29, Issue 9, p1364
- ISSN
0905-7188
- Publication type
Article
- DOI
10.1111/sms.13462