PNF and Movement

Korea Proprioceptive Neuromuscular Facilitation Association (대한고유수용성신경근촉진법학회)
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Effects of the Air-Pressure Asymmetry of Wheelchair Tires on Pelvic Height, Gluteal Pressure, and Muscular Recruitment Pattern in Asymptomatic Participants

타이어 공기압 비대칭이 무증상 대상자의 골반높이, 둔부압력, 근동원패턴에 미치는 영향

  • 박상영 (위덕대학교 물리치료학과) ;
  • 박세연 (위덕대학교 물리치료학과)
  • Received : 2021.10.28
  • Accepted : 2021.11.09
  • Published : 2021.12.31
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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

Acknowledgement

현 연구는 2019년 정부의 재원으로 한국연구재단의 지원을 받아 수행된 연구입니다(No. 2019R1G1A1007809).

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