Author: Kuo-Cheng Liu1, Jong-Shyan Wang2,3,4, Chien-Ya Hsu1, Chia-Hao Liu5, Carl Pc Chen1,6, Shu-Chun Huang1,3,5,6
Affiliation: <sup>1</sup> Department of Physical Medicine & Rehabilitation, Chang Gung Memorial Hospital, Linkou, Taiwan. <sup>2</sup> Department of Physical Medicine and Rehabilitation, Chang Gung Memorial Hospital, Keelung, Taiwan. <sup>3</sup> Healthy Aging Research Center, Chang Gung University, Taoyuan City, Taiwan. <sup>4</sup> Research Center for Chinese Herbal Medicine, College of Human Ecology, Chang Gung University of Science and Technology, Taoyuan, Taiwan. <sup>5</sup> Department of Physical Medicine and Rehabilitation, New Taipei Municipal Tucheng Hospital, Chang Gung Memorial Hospital. <sup>6</sup> College of Medicine, Chang Gung University, Kwei-Shan, Taoyuan County, Taiwan.
Conference/Journal: J Sports Sci Med
Date published: 2021 May 25
Other: Volume ID: 20 , Issue ID: 3 , Pages: 431-437 , Special Notes: doi: 10.52082/jssm.2021.431. , Word Count: 296
It is important to use short breaks to accelerate post-exercise recovery in sports. Previous studies have revealed that vibration can reduce post-exercise muscle soreness. However, there is still high heterogeneity in the effects of vibration on cardiovascular autonomic activities, and most studies to date have focused on high-frequency vibration. This study aimed to investigate the effect of low-frequency lower-body vibration (LBV) on post-exercise changes in heart rate variability and peripheral arterial tone. Ten men and 9 women aged 20 to 25 were recruited for this study. Each subject visited the testing room three times with at least 2 days in between. Each time, the subject received one of the three different vibration frequencies (0, 5, and 15 Hz) in a random order in the sitting position for 10 minutes. LBV was performed immediately after a static standing (control) test and 3-min-step test. Heart rate variability and digital volume pulse wave were recorded during the vibration phase (V1: vibration 0-5 minutes; V2: 6-10 minutes) and the recovery phase (Rc1: recovery phase 11-15 minutes; Rc2: 16-20 minutes). The result of digital pulse wave analysis showed that the reflection index (RI) under 15 Hz decreased during V1. Heart rate of the 15-Hz group also decreased during Rc1 and Rc2. According to the analysis of heart rate variability, low-frequency power/high-frequency power (LF/HF) decreased and normalized high-frequency power (nHF) increased during V2, Rc1 and Rc2 under 15 Hz and, during Rc2 under 5 Hz vibration. This study confirmed that the application of low-frequency LBV after exercise can reduce peripheral vascular tone, accelerate heart rate recovery, decrease cardiac sympathetic nerve activity, and promote parasympathetic nerve activity. The effect was more pronounced at 15 Hz than at 5 Hz. The findings provide a method to accelerate cardiovascular autonomic recovery after exercise.
Keywords: Vibration; heart rate variability; pulse wave velocity.
PMID: 34267582 PMCID: PMC8256514 DOI: 10.52082/jssm.2021.431