Please use this identifier to cite or link to this item: http://hdl.handle.net/10397/70761
Title: The effects of bending speed on the lumbo-pelvic kinematics and movement pattern during forward bending in people with and without low back pain
Authors: Tsang, SMH 
Szeto, GPY 
Li, LMK 
Wong, DCM 
Yip, MMP 
Lee, RYW
Keywords: Low back pain
Lumbo-pelvic movement
Kinematics
Coordination
Forward bending
Issue Date: 2017
Publisher: BioMed Central
Source: BMC musculoskeletal disorders, 2017, v. 18, 157, p. 1-11 How to cite?
Journal: BMC musculoskeletal disorders 
Abstract: Background: Impaired lumbo-pelvic movement in people with low back pain during bending task has been reported previously. However, the regional mobility and the pattern of the lumbo-pelvic movement were found to vary across studies. The inconsistency of the findings may partly be related to variations in the speed at which the task was executed. This study examined the effects of bending speeds on the kinematics and the coordination lumbo-pelvic movement during forward bending, and to compare the performance of individuals with and without low back pain. Methods: The angular displacement, velocity and acceleration of the lumbo-pelvic movement during the repeated forward bending executed at five selected speeds were acquired using the three dimensional motion tracking system in seventeen males with low back pain and eighteen males who were asymptomatic. The regional kinematics and the degree of coordination of the lumbo-pelvic movement during bending was compared and analysed between two groups. Results: Significantly compromised performance in velocity and acceleration of the lumbar spine and hip joint during bending task at various speed levels was shown in back pain group (p < 0.01). Both groups displayed a high degree of coordination of the lumbo-pelvic displacement during forward bending executed across the five levels of speed examined. Significant between-group difference was revealed in the coordination of the lumbo-pelvic velocity and acceleration (p < 0.01). Asymptomatic group moved with a progressively higher degree of lumbo-pelvic coordination for velocity and acceleration while the back pain group adopted a uniform lumbo-pelvic pattern across all the speed levels examined. Conclusions: The present findings show that bending speed imposes different levels of demand on the kinematics and pattern of the lumbo-pelvic movement. The ability to regulate the lumbo- pelvic movement pattern during the bending task that executed at various speed levels was shown only in pain-free individuals but not in those with low back pain. Individuals with low back pain moved with a stereotyped strategy at their lumbar spine and hip joints. This specific aberrant lumbo- pelvic movement pattern may have a crucial role in the maintenance of the chronicity in back pain.
URI: http://hdl.handle.net/10397/70761
ISSN: 1471-2474
DOI: 10.1186/s12891-017-1515-3
Rights: © The Author(s). 2017 Open Access This article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The Creative Commons Public Domain Dedication waiver (http://creativecommons.org/publicdomain/zero/1.0/) applies to the data made available in this article, unless otherwise stated.
The following publication Tsang, S. M. H., Szeto, G. P. Y., Li, L. M. K., Wong, D. C. M., Yip, M. M. P., & Lee, R. Y. W. (2017). The effects of bending speed on the lumbo-pelvic kinematics and movement pattern during forward bending in people with and without low back pain. BMC Musculoskeletal Disorders, 18, 157, 1-11 is available at https://dx.doi.org/10.1186/s12891-017-1515-3
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