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http://dx.doi.org/10.21598/JKPNFA.2021.19.3.375

Effects of the Air-Pressure Asymmetry of Wheelchair Tires on Pelvic Height, Gluteal Pressure, and Muscular Recruitment Pattern in Asymptomatic Participants  

Park, Sang-Yeong (Department of Physical Therapy, Uiduk University)
Park, Se-Yeon (Department of Physical Therapy, Uiduk University)
Publication Information
PNF and Movement / v.19, no.3, 2021 , pp. 375-382 More about this Journal
Abstract
Purpose: The objectives of the present study were to investigate the disadvantages of tire pressure asymmetry of a wheelchair tire and recommend the criterion for appropriate tire pressure without generating negative changes in the musculoskeletal system in asymptomatic participants. Methods: Fourteen asymptomatic participants were asked to sit in pressure-controlled wheelchairs and perform desk work for 20 minutes in each tire condition. The asymmetry of the tire conditions was set as 0% difference, 25% difference, and 50% difference from the recommended pressure. The pelvic alignment and muscular recruitment represented as a flexion-relaxation ratio (FRR) were measured at pre-test, and after each condition of desk work. The displacement of the center of pressure (COP) was measured during the desk work. Results: The tire air pressure condition significantly affected the FRR and COP (P < 0.05). Both sides of the FRR values were significantly higher under the symmetrical tire conditions (0% difference) and pre-test, compared with the asymmetrical tire condition of 50% difference (P < 0.05). The mediolateral COP displacement of the asymmetrical tire conditions (25% and 50% difference) was significantly higher than that of the symmetrical tire conditions (0%) (P < 0.05). Conclusion: Asymmetrical tire conditions could cause changes in the muscle recruitment pattern of the erector spine and mediolateral COP displacement. Tire pressure asymmetry higher than 50% could be a risk factor for prevalence of back pain, so this level of asymmetry in tire pressures should be cautioned against for wheelchair users.
Keywords
Center of pressure; Flexion-relaxation ratio; Neuromuscular;
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1 Cho SH, Park SY. Immediate effects of isometric trunk stabilization exercises with suspension device on flexion extension ratio and strength in chronic low back pain patientss. Journal of Back and Musculoskeletal Rehabilitation. 2019;32(3):431-436.   DOI
2 de Groot S, Vegter RJ, van der Woude LH. Effect of wheelchair mass, tire type and tire pressure on physical strain and wheelchair propulsion technique. Medical Engineering and Physics. 2013;35(10):1476-1482.   DOI
3 Kim Y, Kang HW, Kim SH, et al. Prolonged sitting-induced back pain influences abdominal muscle thickness in a sitting but not a supine position. Scientific Reports. 2021:11(1):163-169.   DOI
4 Kovacs FM, Seco J, Royuela A, et al. Prevalence and factors associated with a higher risk of neck and back pain among permanent wheelchair users: a cross-sectional study. Spinal Cord. 2018;56(4):392-405.   DOI
5 Shin H, Kim J, Kim J J, et al. Pressure relieving effect of adding a pelvic well pad to a wheelchair cushion in individuals with spinal cord injury. Annals of Rehabilitation Medicine. 2018;42(2):270-276.   DOI
6 Todd AI, Bennett AI, Christie CJ. Physical implications of prolonged sitting in a confined posture-a literature review. Ergonomics. 2007;19(2):7-21.
7 Troy BS, Cooper RA, Robertson RN, et al. An analysis of work postures of manual wheelchair users in the office environment. Journal of Rehabilitation Research and Development. 1997;34(2):151-161.
8 Ambroz C, Scott A, Ambroz A, et al. Chronic low back pain assessment using surface electromyography. Journal of Occupational and Environmental Medicine. 2000;42(6):660-669.   DOI
9 Booka M, Yoneda I, Hashizume T, et al. Effect of tire pressure to physical workload at operating a manual wheelchair. Studies in Health Technology and Informatics. 2015;217(1):929-934.
10 Yoo WG, Park SY, Lee MR. Relationship between active cervical range of motion and flexion-relaxation ratio in asymptomatic computer workers. Journal of Physiological Anthropology. 2011;30(5):203-207.   DOI
11 O'Sullivan K, O'Dea P, Dankaerts W, et al. Neutral lumbar spine sitting posture in pain-free subjects. Manual Therapy. 2010;15(6):557-561.   DOI
12 Sawatzky BJ, Kim WO, Denison I. The ergonomics of different tyres and tyre pressure during wheelchair propulsion. Ergonomics. 2004;47(14):1475-83.   DOI
13 Kwon YR, Kim JW, Heo JH, et al. The effect of sitting posture on the loads at cervico-thoracic and lumbosacral joints. Technology and Health Care. 2018;26(S1):409-418.   DOI
14 Lee H. Assessment of the degree of pelvic tilt within a normal asymptomatic population. Manual Therapy. 2011; 16(6):646-648.   DOI
15 Neumann DA. Kinesiology of the musculoskeletal system. St. Louis. Mosby. 2002.
16 O'Sullivan PB, Kendell M, Moller NE. The effect of different standing and sitting postures on trunk muscle activity in a pain-free population. Spine. 2002;27(11):1238- 1244.   DOI
17 Jung KS, Jung JH, In TS. The effects of cross-legged sitting on the trunk and pelvic angles and gluteal pressure in people with and without low back pain. International Journal of Environmental Research and Public Health. 2020;17(13):4621.   DOI
18 Uchiyama T, Kondo G. Relationships among electromyogram, displacement and velocity of the center of pressure, and muscle stiffness of the medial gastrocnemius muscle during quiet standing. Advanced Biomedical Engineering, 2020;9(1):138-145.   DOI
19 Park SY, Yoo WG. Effects of a posture-sensing air seat device (PSASD) on kinematics and trunk muscle activity during continuous computer work. Journal of Physiological Anthropology 2011;30(4):147-151.   DOI
20 Park UJ, Jang SH. The influence of backrest inclination on buttock pressure. Annals of Rehabilitation Medicine. 2011;35(6):897-906.   DOI
21 Pialasse JP, Dubois JD, Choquette MH, et al. Kinematic and electromyographic parameters of the cervical flexion-relaxation phenomenon: the effect of trunk positioning. Annals of Physical and Rehabilitation Medicine. 2009;52(1):49-58   DOI