컴퓨터 컴퓨터 컴퓨터 컴퓨터 타이핑 타이핑 타이핑 타이핑 작업 작업 작업 작업 시 앞쪽머리자세가 앞쪽머리자세가 앞쪽머리자세가 앞쪽머리자세가 목과 목과 목과 목과 어의 어의 어의 어의 근 활성도에 활성도에 활성도에 활성도에 미치는 미치는 미치는 미치는 영향 영향 영향 영향 연세대학교 연세대학교 연세대학교 연세대학교 보건환경대학원 보건환경대학원 보건환경대학원 보건환경대학원 인간공학치료학 인간공학치료학 인간공학치료학 인간공학치료학전공 전공 전공 전공 박 상 덕
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컴퓨터 타이핑타이핑 작업작업 시시시시 … · 둘째, 한글 워드프로세스 사용 경험이 있으며, 한컴타자연습프로그램1을 사용하 여 키보드를
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ABSTRACTABSTRACTABSTRACTABSTRACT
Electromyographic ActivitElectromyographic ActivitElectromyographic ActivitElectromyographic Activities of Neck and Shoulder Muscle ies of Neck and Shoulder Muscle ies of Neck and Shoulder Muscle ies of Neck and Shoulder Muscle
During the Computer Typing in Forward Head PDuring the Computer Typing in Forward Head PDuring the Computer Typing in Forward Head PDuring the Computer Typing in Forward Head Postureostureostureosture
Park Sang-Deok
Dept. of Ergonomic Therapy
The Graduate School of
Health and Environment
Yonsei University
The aim of this study was to determine the electromyographic activity of
neck and shoulder muscles during computer typing with forward head and
neutral head posture. Twenty healthy students performed typing with
forward head posture (posture 1) and neutral head posture (posture 2).
Electromyographic(EMG) activity of the upper trapezius and splenius capitis
was measured in each posture. The EMG amplitude was normalized using the
reference voluntary contraction (RVC). A paired t-test was used to compare
the difference in the activity of each muscle in posture 1 and posture 2. The
mean %RVC of the upper trapezius was 9.1% (left), 7.0% (right) in posture 1
and 6.9% (left), 6.0% (right) in posture 2. The mean %RVC of the splenius
capitis was 61.9% (left), 38.8% (right) in posture 1 and 56.3% (left), 34.0%
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(right) in posture 2. There was significant difference in the EMG amplitudes
of both upper trapezius and splenius capitis in posture 1 (p<0.05). In
conclusion, muscle activity of both upper trapezius and splenius capitis is
increased in forward head posture. To reduce loading in the neck and
shoulder muscles during computer typing, the head must be maintained in
neutral head posture.
Key Words: Electromyographic activity, Forward head posture, Neutral head