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Effect of Different Local Vibration Frequencies on the Multiscale Regularity of Plantar Skin Blood Flow

Authors :
Fuyuan Liao
Keying Zhang
Lingling Zhou
Yanni Chen
Jeannette Elliott
Yih-Kuen Jan
Source :
Entropy, Vol 22, Iss 11, p 1288 (2020)
Publication Year :
2020
Publisher :
MDPI AG, 2020.

Abstract

Local vibration has shown promise in improving skin blood flow (SBF). However, there is no consensus on the selection of the best vibration frequency. An important reason may be that previous studies utilized time- and frequency-domain parameters to characterize vibration-induced SBF responses. These parameters are unable to characterize the structural features of the SBF response to local vibrations, thus contributing to the inconsistent findings seen in vibration research. The objective of this study was to provide evidence that nonlinear dynamics of SBF responses would be an important aspect for assessing the effect of local vibration on SBF. Local vibrations at 100 Hz, 35 Hz, and 0 Hz (sham vibration) with an amplitude of 1 mm were randomly applied to the right first metatarsal head of 12 healthy participants for 10 min. SBF at the same site was measured for 10 min before and after local vibration. The degree of regularity of SBF was quantified using a multiscale sample entropy algorithm. The results showed that 100 Hz vibration significantly increased multiscale regularity of SBF but 35 Hz and 0 Hz (sham vibration) did not. The significant increase of regularity of SBF after 100 Hz vibration was mainly attributed to increased regularity of SBF oscillations within the frequency interval at 0.0095–0.15 Hz. These findings support the use of multiscale regularity to assess effectiveness of local vibration on improving skin blood flow.

Details

Language :
English
ISSN :
10994300
Volume :
22
Issue :
11
Database :
Directory of Open Access Journals
Journal :
Entropy
Publication Type :
Academic Journal
Accession number :
edsdoj.2db7a337aaa453ca9e7b4f23385709d
Document Type :
article
Full Text :
https://doi.org/10.3390/e22111288