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Open Access 04-05-2024 | Coronary Heart Disease | Original Article

Is breathing frequency a potential means for monitoring exercise intensity in people with atrial fibrillation and coronary heart disease when heart rate is mitigated?

Authors: John P. Buckley, Tasuku Terada, Anna Lion, Jennifer L. Reed

Published in: European Journal of Applied Physiology

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Abstract

Purpose

Moderate-intensity aerobic exercise is safe and beneficial in atrial fibrillation (AF) and coronary heart disease (CHD). Irregular or rapid heart rates (HR) in AF and other heart conditions create a challenge to using HR to monitor exercise intensity. The purpose of this study was to assess the potential of breathing frequency (BF) to monitor exercise intensity in people with AF and CHD without AF.

Methods

This observational study included 30 AF participants (19 Male, 70.7 ± 8.7 yrs) and 67 non-AF CHD participants (38 Male, 56.9 ± 11.4 yrs). All performed an incremental maximal exercise test with pulmonary gas exchange.

Results

Peak aerobic power in AF (\({\dot{\text{V}}}\)O2peak; 17.8 ± 5.0 ml.kg−1.min−1) was lower than in CHD (26.7 ml.kg−1.min−1) (p < .001). BF responses in AF and CHD were similar (BF peak: AF 34.6 ± 5.4 and CHD 36.5 ± 5.0 breaths.min−1; p = .106); at the 1st ventilatory threshold (BF@VT-1: AF 23.2 ± 4.6; CHD 22.4 ± 4.6 breaths.min−1; p = .240). %\({\dot{\text{V}}}\)O2peak at VT-1 were similar in AF and CHD (AF: 59%; CHD: 57%; p = .656).

Conclusion

With the use of wearable technologies on the rise, that now include BF, this first study provides an encouraging potential for BF to be used in AF and CHD. As the supporting data are based on incremental ramp protocol results, further research is required to assess BF validity to manage exercise intensity during longer bouts of exercise.
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Metadata
Title
Is breathing frequency a potential means for monitoring exercise intensity in people with atrial fibrillation and coronary heart disease when heart rate is mitigated?
Authors
John P. Buckley
Tasuku Terada
Anna Lion
Jennifer L. Reed
Publication date
04-05-2024
Publisher
Springer Berlin Heidelberg
Published in
European Journal of Applied Physiology
Print ISSN: 1439-6319
Electronic ISSN: 1439-6327
DOI
https://doi.org/10.1007/s00421-024-05487-2