앉은 자세에서 글쓰기 작업 시 구부정한 자세와 곧게 세운 자세에 따른 목과 체간 신전근의 근활성도 변화 비교 = Comparison of Postural Changes between Slump and Upright Sitting Posture on Neck and Trunk Motion and Erector Spinae Muscles Activity during Writing Task

다국어 초록 (Multilingual Abstract)

Objective: The purpose of this study was to investigate whether slump and upright posture affect on the neck and trunk range of motion, and these erector muscle activity during writing task.
Method: All participants performed a writing task at the same desk and chair in the upright and slump sitting posture. Motion analysis system and surface electromyogram (EMG) were used to analyzing the neck and trunk motion and spine erector muscles activity. Paired t-tests were used to compare neck and trunk angles and both muscles
activity.
Results: There are significant differences in neck flexion-extension, lateral flexion, and rotation (p<.05). Trunk flexion, rotation was significantly greater in slump posture. In both cervical and lumbar erector muscles, there are significant differences in slump and upright posture (p<.05). Lumbar muscle symmetry ratio was significantly higher in
slump than upright sitting posture (p<.05).
Conclusion: Slump sitting posture may lead to more joint motion and muscle activity in neck and trunk joints and spine erector muscles. These findings suggest that maintain the upright posture would be more effectiveness to joints and muscles for prevent musculoskeletal disorders.

참고문헌 (Reference)

1 O’Sullivan, P. B., "The relationship beween posture and back muscle endurance in industrial workers with flexion-related low back pain" 11 (11): 264-271, 2006

2 Caneiro, J. P., "The influence of different sitting postures on head/neck posture and muscle activity" 15 (15): 54-60, 2010

3 Black, K. M., "The influence of different sitting positions on cervical and lumbar posture" 21 (21): 65-70, 1996

4 Karlsson, J., "The effect of external ankle support in chronic lateral ankle joint instability an electromyographic study" 20 (20): 257-261, 1992

5 Edmondston, S. J., "Postural neck pain : an investigation of habitual sitting posture, perception of ‘good’posture and cervicothoracic kinaesthesia" 12 (12): 363-371, 2007

6 Cholewicki, J., "Postural control of trunk during unstable sitting" 33 (33): 1733-1737, 2000

7 Oddsson, L. I., "Interaction between voluntary and postural motor commands during perturbed lifting" 24 (24): 545-552, 1999

8 Watanabe, S., "Influence of trunk muscle co-contraction on spinal curvature during sitting for desk work" 47 (47): 273-278, 2007

9 Schüldt, K., "Influence of sitting postures on neck and shoulder emg during arm-hand work movements" 2 (2): 126-113, 1987

10 Lee, S., "Head flexion angle while using a smartphone" 58 (58): 220-226, 2015

11 Magnusson, M. L., "European spine society—The acromed prize for spinal research 1995 unexpected load and asymmetric posture as etiologic factors in low back pain" 5 (5): 23-35, 1996

12 Kumar, S., "Electromyography of trunk muscles in isometric graded axial rotation" 12 (12): 317-328, 2002

13 McGill, S. M., "Electromyographic activity of the abdominal and low back musculature during the generation of isometric and dynamic axial trunk torque : implications for lumbar mechanics" 9 (9): 91-103, 1991

14 Falla, D., "Effect of neck exercise on sitting posture in patients with chronic neck pain" 87 (87): 408-417, 2007

15 Dankaerts, W., "Differences in sitting postures are associated with nonspecific chronic low back pain disorders when patients are subclassified" 31 (31): 698-704, 2006

16 Szeto, G. P., "A field comparison of neck and shoulder postures in symptomatic and asymptomatic office workers" 33 (33): 75-84, 2002