Impaired Heart Rate Response During Incremental Exercise in Patients With Acute Myocardial Infarction and After Coronary Artery Bypass Grafting - Evaluation of Coefficients With Karvonen’s Formula -

Kazuto Omiya; Haruki Itoh; Naohiko Osada; Makoto Kato; Akira Koike; Koichi Sagara; Kei-ichi Aoki; Long-Tai Fu; Hiroshi Watanabe; Kazuzo Kato; Kazuhiko Tanabe; Masahiro Murayama

doi:10.1253/jcj.64.851

Clinical Investigations

Impaired Heart Rate Response During Incremental Exercise in Patients With Acute Myocardial Infarction and After Coronary Artery Bypass Grafting

- Evaluation of Coefficients With Karvonen’s Formula -

Kazuto Omiya, Haruki Itoh, Naohiko Osada, Makoto Kato, Akira Koike, Koichi Sagara, Kei-ichi Aoki, Long-Tai Fu, Hiroshi Watanabe, Kazuzo Kato, Kazuhiko Tanabe, Masahiro Murayama

Author information

Kazuto Omiya
The Cardiovascular Institute, Tokyo
Haruki Itoh
The Cardiovascular Institute, Tokyo
Naohiko Osada
The Cardiovascular Institute, Tokyo
Makoto Kato
The Cardiovascular Institute, Tokyo
Akira Koike
The Cardiovascular Institute, Tokyo
Koichi Sagara
The Cardiovascular Institute, Tokyo
Kei-ichi Aoki
The Cardiovascular Institute, Tokyo
Long-Tai Fu
The Cardiovascular Institute, Tokyo
Hiroshi Watanabe
The Cardiovascular Institute, Tokyo
Kazuzo Kato
The Cardiovascular Institute, Tokyo
Kazuhiko Tanabe
Division of Cardiology, Department of Internal Medicine, St Marianna University School of Medicine, Kawasaki, Japan
Masahiro Murayama
Division of Cardiology, Department of Internal Medicine, St Marianna University School of Medicine, Kawasaki, Japan

Keywords: Cardiac rehabilitation, Exercise intensity, Heart rate response, Ischemic heart disease, Karvonen’s method

JOURNAL FREE ACCESS

2000 Volume 64 Issue 11 Pages 851-855

DOI https://doi.org/10.1253/jcj.64.851

Details

Abstract

Heart rate (HR) response during exercise in patients with ischemic heart disease was evaluated, and the appropriateness of Karvonen’s method for determining rehabilitation exercise target HR was investigated. The study group comprised 24 patients with acute myocardial infarction (AMI) and 37 patients who had undergone coronary artery bypass grafting (CABG). Cardiopulmonary exercise testing (CPX) was performed with a cycle ergometer and changes in HR (ΔHR)/changes in work rate (ΔWR) and interval changes of the coefficient of Karvonen’s formula were evaluated. In the AMI group and the CABG group, ΔHR/ΔWR were significantly lower than those of age-matched control subjects (p<0.01). Karvonen’s coefficients ranged from 0.37 to 0.54 when calculated from actual peak HR and 0.21 to 0.32 calculated from the predicted peak HR. An impaired HR response was found in patients with AMI and those who had had CABG up to 6 months previously. Because the Karvonen’s coefficient values, which ranged from 0.6 to 0.8, were elevated for these patients, and considering the data from the CPX, increased exercise is recommended for such cases.

Corresponding author

Register with J-STAGE for free!