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Influence of running stride frequency in heart rate variability analysis during treadmill exercise testing
Raquel Bailón1, Nuria Garatachea, Ignacio de la Iglesia
1Aragón Institute of Engineering Research, IIS Aragón, Spain. rbailon@unizar.es
IEEE Transactions on Bio-Medical Engineering
|January 30, 2013
Summary
A new component linked to running stride frequency (SF) appears in heart rate variability (HRV) during maximal exercise. This SF component significantly impacts the interpretation of low-frequency (LF) and high-frequency (HF) HRV data.
Area of Science:
- Exercise Physiology
- Autonomic Nervous System Research
- Biomedical Signal Processing
Background:
- Heart rate variability (HRV) analysis during exercise is complex due to non-stationary physiological signals.
- Existing HRV analysis methods can be confounded by exercise-specific artifacts, such as those related to pedaling frequency in cycling.
- The influence of running stride frequency on HRV during maximal treadmill testing requires further investigation.
Purpose of the Study:
- To test the hypothesis that a component related to running stride frequency (SF) is present in HRV during maximal exercise.
- To determine the impact of this SF component on the interpretation of low-frequency (LF) and high-frequency (HF) HRV components.
- To assess how the SF component's power changes with increasing exercise intensity.
Main Methods:
- Analysis of HRV data from 23 subjects during maximal treadmill exercise tests.
- Computation of instantaneous power of HRV components using the smoothed pseudo-Wigner-Ville distribution.
- Estimation of the autonomic nervous system signal using a time-varying integral pulse frequency modulation model.
Main Results:
- A distinct component centered at the running stride frequency (SF) and its aliases was identified in the HRV.
- The SF component and its aliases accounted for approximately 22±7% of the total HRV power across subjects.
- Normalized LF power decreased with exercise intensity, while normalized HF power increased; SF component power remained stable.
Conclusions:
- The running stride frequency (SF) component is a significant factor in HRV during maximal treadmill exercise.
- SF component aliases can overlap with traditional LF and HF components, potentially confusing HRV interpretation.
- Accurate HRV analysis during running requires accounting for the influence of stride frequency.
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