Yotsuya Mamoru, Sato Toru, Kawamura Sadayuki, Furuya Eiji, Saito Fumiaki, Hisanaga Ryuichi, Onodera Kozue
Department of Crown and Bridge Prosthodontics, Tokyo Dental College, Chiba, Japan.
Bull Tokyo Dent Coll. 2009;50(4):191-8. doi: 10.2209/tdcpublication.50.191.
The purpose of this study was to investigate the influence of anteroposterior postural change on electromyography (EMG) activity in the lateral pterygoid muscle. Subjects consisted of 7 patients attending this hospital for close examination. The inferior heads of the lateral pterygoid and masseter muscles were chosen as evaluation sites. For the EMG recordings, the test movement was opening and closing of the mouth; postural conditions were the upright and supine positions. The mean value of EMG activity in the inferior head of the lateral pterygoid muscle was calculated. During mouth-opening in 5 out of the 7 patients, and during mouth-closing in 2 out of the 7 patients, mean value of EMG activity differed significantly with body position. Mean value of EMG activity was reduced in the supine position. The results revealed that anteroposterior postural change affected mean value of EMG activity in this muscle.
本研究的目的是调查前后姿势变化对翼外肌肌电图（EMG）活动的影响。研究对象包括7名到本院进行详细检查的患者。选择翼外肌下头和咬肌作为评估部位。对于肌电图记录，测试动作是张口和闭口；姿势条件是直立位和平卧位。计算翼外肌下头肌电图活动的平均值。在7名患者中，有5名在张口时，2名在闭口时，肌电图活动平均值随体位有显著差异。平卧位时肌电图活动平均值降低。结果表明，前后姿势变化会影响该肌肉的肌电图活动平均值。
