• 한국전문물리치료학회지
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• 제13권4호
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• pp.39-46
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• 2006

The purpose of this study was to determine the effects of slump sitting postures on the masticatory, neck, shoulder, and trunk muscles associated with work-related musculoskeletal disorders (WRMD). Eleven healthy adults (age, $23.3{\pm}2.7$ yrs; height, $174.0{\pm}4.1$ cm; weight, $61.4{\pm}6.6$ kg) participated in this study. The participants were free of injury history and neurologic deficits in the masticatory, neck muscles and upper extremities at the time of participation. The subjects were asked to perform erect and slump sitting postures under the guidance of physical therapists. The surface electromyography (EMG) was recorded from the anterior temporalis, masseter, upper trapezius, serratus anterior, middle trapezius, L3 paraspinal, external abdominal oblique, gluteus maximus muscles of 11 adults as they performed visual terminal display work, which are known as the weakened and tightened muscles owing to WRMD. The recorded signals were averaged and normalized to the mean amplitude of the EMG signal obtained during submaximal reference voluntary contractions. The results of study were as follows: The masseter, upper trapezius, serratus anterior, middle trapezius, L3 paraspinal, external abdominal oblique muscles significantly differed in the slump sitting posture (p<.05). The muscle activities of the serratus anterior, middle trapezius muscle, and external abdominal oblique were significantly lower and that of the masseter, upper trapezius, L3 paraspinal muscles were significantly higher. Further research is needed to assess the motor control problems and the function of the deep muscles in posture stability of patients with WRMD.

• 한국산학기술학회논문지
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• 제13권5호
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• pp.2212-2218
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• 2012

본 연구의 목적은 다른 앉기 자세에 따라 목의 관절가동범위, 근력, 위치감각과 힘 감각에 어떠한 영향을 미치는가에 대해 알아보고자 하였다. 본 연구는 15명의 건강한 일반 대학생이 참여하였다. 곧은 앉기 자세와 구부정한 앉기 자세에 따라 관절가동범위와 관절위치감각은 관절각도 측정기를 사용하여 측정하였고, 최대 등척성 근력과 힘감각은 linear force를 사용하여 측정하였다. 그 결과 곧은 자세가 구부정한 자세보다 목의 최대 신전각도, 굴곡시 최대 등척성 근력이 유의하게 컸다(p<0.05). 또한 곧은 자세에서 관절위치감각과 힘감각의 오차가 유의하게 작았다(p<0.05). 이와같은 결과를 통해 다른 앉기자세가 목의 움직임 범위와 근력, 고유수용성감각에 영향을 미치며 곧은 앉기 자세가 구부정한 자세보다 관절가동범위와 근력에 이점이 있으며 고유수용성감각에 대한 인지능력이 향상됨을 알 수 있었다.

• 한국전문물리치료학회지
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• 제16권2호
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• pp.31-39
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• 2009

This study is performed to investigate the difference of the spinal stability system with and without low back pain. There were 9 participants with low back pain and 9 asymptomatic subjects to be recruited, they were measured thoracic and lumbar curvature, trunk muscle activation in upright sitting postures and slump sitting, back muscle endurance, and lumbar proprioception. Spinal curvature and surface electromyography of 4 trunk muscles were measured in an upright sitting postures and slump sitting in 18 subjects. The result of the study was that there were significant differences between the groups in spinal curvature (p<.05), significantly higher external oblique activity and less internal oblique in the low back pain group than the healthy subjects (p<.05), and significantly less proprioception in the low back pain group (p<.05). But there was not a significant difference between the trunk muscle endurance groups. According to the result, the low back pain group had greater thoracic extension and higher global muscle activity in the upright sitting posture and less proprioception. This study was useful to suggest postural training for normal muscle activation, selective muscle strengthening to prevent chronic deterioration, and helpful in making a treatment plan to indicate a synthetic care method that includes increasing proprioception.