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Impact-induced soft-tissue vibrations associate with muscle activation in human landing movements: An accelerometry and EMG evaluation

Issue title: Papers from the 3rd International Conference on Biomedical Engineering and Technology (iCBEB 2014), 25–28 September 2014, Beijing, China

Subtitle:

Guest editors: Edward J. Ciaccio

Article type: Research Article

Authors: Fu, Weijiea | Wang, Xib | Liu, Yua; *

Affiliations: [a] Key Laboratory of Exercise and Health Sciences of Ministry of Education, Shanghai University of Sport, Shanghai, China | [b] School of Kinesiology, Shanghai University of Sport, Shanghai, China

Correspondence: [*] Corresponding author: Yu Liu, Key Laboratory of Exercise and Health Sciences of Ministry of Education, Shanghai University of Sport, 200438 Shanghai, China. Tel.: +86 21 5125 3571; Fax: +86 21 5125 3242; E-mail:yuliu@sus.edu.cn

Keywords: Soft tissue vibrations, externally damping, muscle activity, landing

DOI: 10.3233/THC-150952

Journal: Technology and Health Care, vol. 23, no. s2, pp. S179-S187, 2015

Published: 2015
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Abstract

BACKGROUND: Previous studies have not used neurophysiological methodology to explore the damping effects on induced soft-tissue vibrations and muscle responses.

OBJECTIVE: This study aimed to investigate the changes in activation of the musculoskeletal system in response to soft-tissue vibrations with different applied compression conditions in a drop-jump landing task.

METHODS: Twelve trained male participants were instructed to perform drop-jump landings in compression shorts (CS) and regular shorts without compression (control condition, CC). Soft-tissue vibrations and EMG amplitudes of the leg within 50 ms before and after touchdown were collected synchronously.

RESULTS: Peak acceleration of the thigh muscles was significantly lower in CS than in CC during landings from 45 or 60 cm and 30 cm heights (p < 0.05), respectively. However, the damping coefficient was higher in CS than in CC at the thigh muscles during landings from 60 cm height (p < 0.05). Significant decrease in EMG amplitude of the rectus femoris and biceps femoris muscles was also observed in CS (p < 0.05).

CONCLUSION: Externally induced soft-tissue vibration damping was associated with a decrease in muscular activity of the rectus femoris and biceps femoris muscles during drop-jump landings from different heights.

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