Above all, several studies are still looking into how to utilize unpredictable fluctuations in biology ( McDonnell and Abbott, 2009 ), and such comprehension might be significant for the development of biomedical studies. 2 Methods The investigation has been approved by the local ethics committee and is performed in accordance with the Declaration of Helsinki, and the subjects are provided with written informed consent forms. 2.1 Wavelet Analysis In the study of skin blood flow regulation mechanisms, Fourier spectrum analysis and wavelet analysis are employed as two basic methods of spectral analysis ( Stefanovska et al., 1999 ; Shaffer et al., 2014 ).
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