Journal of the Ergonomics Society of Korea (대한인간공학회지)

Ergonomics Society of Korea (대한인간공학회)
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Strength and Endurance of the Deep Neck Flexors of Industrial Workers With and Without Neck Pain

경부 통증 유무에 따른 심부 경부 굴곡근의 근력과 지구력 비교

  • Kim, Jae-Cheol (Physical Therapy Section, Yongdong Severance Hospital) ;
  • Yi, Chung-Hwi (Department of Ergonomic Therapy, Graduate School of Health and Environment, Yonsei University) ;
  • Kwon, Oh-Yun (Department of Ergonomic Therapy, Graduate School of Health and Environment, Yonsei University) ;
  • Oh, Duck-Won (Department of) ;
  • Jeon, Hye-Seon
  • 김재철 (영동세브란스 물리치료실) ;
  • 이충휘 (연세대학교 보건환경대학원 인간공학치료학과) ;
  • 권오윤 (연세대학교 보건환경대학원 인간공학치료학과) ;
  • 오덕원 (연세대학교 보건환경대학원 인간공학치료학과) ;
  • 전혜선 (대전대학교 보건스포츠과학대학 물리치료학과)
  • Published : 2007.11.30
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Abstract

The purpose of this study was to investigate the strength and endurance of the deep neck flexor muscles in individuals with work-related neck pain. Subjects consisted of two groups: twenty industrial workers with neck pain and twenty age-matched healthy subjects. To evaluate the strength and endurance of deep cervical flexors, maximum voluntary contractile strength (MVCS) and a sustained time at sub-maximal voluntary contractile strength (SMVCS) (80% and 50% of MVCS) were measured using a pressure biofeedback unit and a stop watch in supine. The MVCS of deep neck flexor muscles was 29.67${\pm}$4.56 in neck pain group and 54.27${\pm}$6.78㎜Hg in normal group. The sustained time at 80% SMVCS was 12.42${\pm}$2.64 seconds and 55.12${\pm}$12.76 seconds in the groups with and without neck pain. The sustained time at 50% SMVCS was 25.40±5.88 seconds and 109.70${\pm}$31.50 seconds in the groups with and without neck pain. The difference of the lower jaw position was 16.75${\pm}$3.57㎜ and 23.03${\pm}$2.51㎜. The MVCS, endurance at the two sub-maximal levels and the difference of the lower jaw position were significantly greater in the group without neck pain than with neck pain (p$<$0.05). The findings indicate that the maximal strength and endurance of the deep neck flexors were decreased in the workers with neck pain compared to those without neck pain. Therefore, it is necessary to include strengthening and endurance exercises of the deep neck flexor muscles in therapeutic program of work-related musculoskeletal disorders involving neck pain.

Keywords

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