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Attenuation of the influence of cardiolocomotor coupling in heart rate variability interpretation during exercise
Insights
Exercise can interfere with heart rate variability (HRV) interpretation by introducing cardiolocomotor coupling. This study developed a method to reduce this interference, improving autonomic nervous system (ANS) analysis during exercise.
Area of Science:
- Exercise Physiology
- Autonomic Nervous System Function
- Heart Rate Variability Analysis
Background:
- Cardiolocomotor coupling during exercise can contaminate heart rate variability (HRV) signals.
- These coupling components may overlap with traditional low-frequency (LF) and high-frequency (HF) HRV bands, complicating autonomic nervous system (ANS) interpretation.
- Understanding these artifacts is crucial for accurate physiological assessment during physical exertion.
Purpose of the Study:
- To investigate cardiolocomotor-related HRV components during maximal treadmill and cycle ergometer tests.
- To propose and evaluate a method for reducing cardiolocomotor coupling's influence on HRV.
- To re-examine the evolution of LF and HF power bands after mitigating cardiolocomotor coupling effects.
Main Methods:
- Maximal exercise tests were conducted on a treadmill and cycle ergometer.
- Analysis focused on cardiolocomotor-related frequency components within HRV.
- A novel method was applied to reduce the impact of cardiolocomotor coupling on HRV data.
Main Results:
- Cardiolocomotor coupling power increased with exercise intensity on a cycle ergometer.
- Treadmill exercise showed consistently higher cardiolocomotor coupling power across intensities.
- Post-method application, LF and HF power bands exhibited more pronounced changes with exercise intensity.
Conclusions:
- Cardiolocomotor coupling significantly impacts HRV interpretation during exercise.
- The proposed method effectively reduces cardiolocomotor coupling artifacts in HRV.
- This approach enhances the sensitivity of HRV analysis to exercise intensity changes for better ANS assessment.
Abstract:
During exercise test, cardiolocomotor coupling related components appear in heart rate variability (HRV), blurring its interpretation as autonomic nervous system (ANS) marker. These cardiolocomotor coupling related components are centered at the pedalling and running stride frequency, as well as at their aliases, and may overlap with the low frequency (LF) and high frequency (HF) components of HRV. In this work cardiolocomotor-related HRV components are studied during maximal exercise test on treadmill and cycle ergometer. Power in the bands related to cardiolocomotor coupling increases with exercise intensity in cycle ergometer but not in treadmill exercise test, where it displays higher values for all exercise intensities. A method is proposed to reduce the effect of this coupling in the interpretation of HRV. Evolution of the power in the low frequency (LF) and high frequency (HF) bands are studied after the proposed reduction of cardiolocomotor coupling, showing more significant changes with exercise intensity than before the method is applied.
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