The role of trunk muscles in sitting balance control in people with low back pain |
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| Institution: | 1. University of Roehampton, Department of Life Sciences, Whitelands College, Holybourne Avenue, London SW15 SJD, UK;2. London South Bank University, School of Applied Science, 103 Borough Road, London SE1 0AA, UK;1. Department of Rehabilitation, Sagamihara Chuo Hospital, 6-4-20, Fujimi, Chuo-ku, Sagamihara, Kanagawa, Japan;2. Department of Rehabilitation, Toho University Omori Medical Center, 6-11-1, Omori-Nishi, Ota-ku, Tokyo, Japan;3. Department of Exercise Physiology and Biomechanics, Faculty of Medicine, School of Medicine, Toho University, 5-21-16, Omori-Nishi, Ota-ku, Tokyo, Japan;4. Department of Physical Therapy, Tokyo University of Technology, 5-23-22, Nishi-Kamata, Ota-ku, Tokyo, Japan;5. Department of Exercise Physiology, School of Pharmacy, Tokyo University of Pharmacy and Life Sciences, 1432-1, Horinouchi, Hachioji, Tokyo, Japan;6. Department of Rehabilitation, School of Allied Health Science, Kitasato University, 1-15-1, Kitasato, Minami-ku, Sagamihara, Kanagawa, Japan;1. School of Health and Human Sciences, Southern Cross University, Lismore, NSW, Australia;2. Human Performance Laboratory, University of Calgary, Calgary, Alberta, Canada;1. Department of Biomechanics, Medicine and Rehabilitation of the Locomotor System, Ribeirão Preto Medical School, University of São Paulo, Ribeirão Preto, SP, Brazil;2. Faculty of Electrical Engineering, Biomedical Engineering Lab, Federal University of Uberlândia, Uberlândia, MG, Brazil;1. Rehabilitation Science Program, University of Colorado Anschutz Medical Campus, Aurora, CO, USA;2. Physical Therapy Program, University of Colorado Anschutz Medical Campus, Aurora, CO, USA;1. Department of Physical Therapy, The Graduate School, Inje University, Republic of Korea;2. Department of Physical Therapy, College of Biomedical Science and Engineering, Inje University, 607 Obangdong, Gimhae, Gyeongsangnamdo 621-749, Republic of Korea |
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| Abstract: | The purpose of this study was to examine the muscular activities and kinetics of the trunk during unstable sitting in healthy and LBP subjects. Thirty-one healthy subjects and twenty-three LBP subjects were recruited. They were sat on a custom-made chair mounted on a force plate. Each subject was asked to regain balance after the chair was tilted backward at 20°, and then released. The motions of the trunk and trunk muscle activity were examined. The internal muscle moment and power at the hip and lumbar spine joints were calculated using the force plate and motion data. No significant differences were found in muscle moment and power between healthy and LBP subjects (p > 0.05). The duration of contraction of various trunk muscles and co-contraction were significantly longer in the LBP subjects (p < 0.05) when compared to healthy subjects, and the reaction times of the muscles were also significantly reduced in LBP subjects (p < 0.05). LBP subjects altered their muscle strategies to maintain balance during unstable sitting, but these active mechanisms appear to be effective as trunk balance was not compromised and the internal moment pattern remained similar. The changes in muscle strategies may be the causes of LBP or the result of LBP with an attempt to protect the spine. |
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| Keywords: | EMG Lumbar spine Kinetics Low back pain |
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