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Evaluating transient phenomena by wavelet analysis: early recovery to exercise
Lana Kralj1, Nejka Potočnik1, Helena Lenasi1
1Institute of Physiology, Faculty of Medicine, University of Ljubljana, Ljubljana, Slovenia.
Wavelet analysis (WA) effectively analyzes transient microcirculation changes after exercise. Endothelial nitric oxide-dependent and respiratory influences increased, while myogenic influence decreased, particularly in finger pulp.
Area of Science:
- Physiology
- Biomedical Engineering
- Signal Processing
Background:
- Cutaneous microcirculation recovery after exercise is complex and transient.
- Conventional spectral analysis struggles to analyze these dynamic changes.
- Early recovery phase is crucial for thermal homeostasis but poorly understood.
Purpose of the Study:
- To apply wavelet analysis (WA) for time-frequency decomposition of laser-Doppler (LD) signals during early recovery from exercise.
- To investigate the physiological mechanisms controlling microcirculation in glabrous and nonglabrous skin during this transient phase.
- To highlight the utility of WA in analyzing complex, non-stationary biological signals.
Main Methods:
- Developed a custom wavelet analysis (WA) algorithm.
- Measured laser-Doppler (LD) signals from finger pulp and forearm during baseline and early recovery after dynamic exercise.
- Decomposed LD signals into power spectra corresponding to endothelial nitric oxide (NO)-dependent, neurogenic, myogenic, respiratory, and cardiac influences.
- Calculated relative power (RP) for each frequency interval.
Main Results:
- Wavelet analysis revealed significant increases in endothelial NO-dependent and respiratory components, and a decrease in the myogenic component in finger pulp during early recovery.
- The forearm showed a significant increase only in the endothelial NO-dependent component.
- These changes indicate a differential regulation of microcirculation in glabrous versus nonglabrous skin post-exercise.
Conclusions:
- Wavelet analysis is an indispensable tool for assessing transient phenomena in biological signals like cutaneous microcirculation.
- The early recovery phase post-exercise involves distinct shifts in regulatory mechanisms, with a notable role for endothelial NO-dependent influence.
- Microcirculatory responses differ between glabrous and nonglabrous skin during recovery, suggesting site-specific physiological control.
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