The immediate effects of postural-adjustment brace for 2 hours on sitting posture and back muscles electromyography
Article Sidebar
Main Article Content
Abstract
The purpose of this study was to study the acute effects of sitting postural-adjustment brace for 2 hours on sitting and electromyography of upper trapezius and erector spinae at T10 and L3. This study was crossover design. Seventeen participants age between 22.00 ± 1.03 years, who have more than 8 hours in sitting posture, were included. Each participant was simple random sampling sequences to 2 patterns, which were group 1 firstly sitting on office chair and group 2 firstly sitting on office chair with sitting postural-adjustment brace. After more than 48 hours, both 2 groups were alternate to another patterns. All 17 participants were sitting on both patterns. Pre and post experiment were tested, the data was divided into 2 groups, which are experiment, data from sitting on office chair with sitting postural-adjustment brace, and control group, data from sitting on office chair. The data of sitting posture and Electromyography were tested the distribution pattern by using Shapiro-Wilk test. The normal distribution data was analyzed by paired t-test (t), whereas the non-normal distribution was analyzed by Wilcoxon sign rank test (z). The significant different was at p<.05. The results showed significant decrease of lean-angle of left and right side (P=0.003 and 0.000 respectively). The lean-angle of post-intervention of experimental group was significant lesser than of control group both left and right side (P=0.006 and 0.002 respectively). Moreover, the electromyography of erector spinae muscle at L3 of experimental group at left side was significantly decrease. Whereas there was no significant different in other data. The conclusion was sitting on office chair with sitting postural-adjustment brace can adjust the sitting posture by decrease the degree of anterior sway significantly, which tend to be ‘good sitting posture’, and decrease the back muscles work, especially at paravertebral muscles at L3 level.
Article Details
This work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.
References
Edmondston SJ, Chan HY, Ngai GCW, Warren MLR, Williams JM. Glennon S, et al. Postural neck pain: an investigation of habitual sitting posture, perception of ‘good’ posture and cervicothoracic kinaesthesia. Manual Ther. 2007;12:363-71.
Hamilton N, Weimar W, Luttgens K. Kinesiology: Scientific basis of human motion. 12th edition. USA: Brown & Benchmark; 2011.
Neumann DA. Kinesiology of the musculoskeletal system: foundations for physical rehabilitation. 3rd edition. USA: Mosby; 2016.
Nordin M, Frankel VH. Basic biomechanics of the musculoskeletal system. 3rd edition. New York: Lippincott William & Wilkins; 2012.
Celenay ST, Kaya DO. An 8-week thoracic spine stabilization exercise program improves postural back pain, spine alignment, postural sway, and core endurance in university student: a randomized controlled study. Turk J Med Sci. 2017;47:504-13.
Barrett E, O’Keeffe M, O’Sullivan K, Lewis J, McCreesh K. Is thoracic spine posture associated with shoulder pain, range of motion and function? a systematic review. Manual Ther. 2016;26: 38-46.
Ball JM, Cagle P, Johnson BE, Lucasey C, Lukert BP. Spinal extension exercise prevent natural progression of kyphosis. Osteoporos Int. 2009; 20: 481-9.
Grondin DE, Triano JJ, Tran S, Soave D. The effect of a lumbar support pillow on lumbar posture and comfort during a prolonged seated task. Chiropr & Manual Ther. 2013;21(21):1-9.
Munoz F, Rouboa AI, Rougier PR. The balance control effects on sitting posture induced by lumbosacral orthosis wear vary depending on the level of stability. Appl Ergon. 2013;44:511-6.
Munoz F, Salmochi JF, Faouen P, Rogier P. Low back pain suffers: is standing postural balance facilitated by a lordotic lumbar brace? Orthop Traumatol-Sur. 2010;96:362-6.
Newcomer K, Laskowski ER, Yu B, Johnson JC, An KN. The effects of a lumbar support on repositioning error in subjects with low back pain. Arch Phys Med Rehab. 2001;82:906-10.
Roelofs PDDM, Bierma-Zeinstra SMA, van Poppel MNM, JellemaP, Willemsen SP, et al. Lumbar supports to prevent recurrent low back pain among home care workers. Ann Intern Med. 2007;147:685-92.
Daffin L, Stuelcken M, Sayers M. Internal and external sagittal craniovertebral alignment: a comparison between radiological and photogrammetric approaches in asymptomatic participants. Musculoskeletal Sci Pract. 2019;43:12-7.
Lewis JS, Wright C, Green A. Subacromial impingement syndrome: the effect of changing posture on shoulder range of movement. JOSPT 2005;35(2):72-87.
Hislop H, Avers D, Brown M. Muscle testing: techniques of manual examination and performance testing. 9th edition. China: Daniels and Worthingham’s; 2013.