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Influence of Teeth Clenching on Bodily Equilibrium against Striking Weight Impact

咬紧牙关对对抗体重冲击的身体平衡的影响

基本信息

批准号：
18592135
负责人：
HIRAI Toshihiro
金额：
$ 2.05万
依托单位：
Health Sciences University of Hokkaido
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
2006
资助国家：
日本
起止时间：
2006 至 2007
项目状态：
已结题

项目摘要

Objectives : The purpose of this study was to elucidate the influence of teeth clenching on head posture and body sway when making the impact load to the greater trochanter of the femur.Methods : Under the mandibular position at rest, 25%, 50%, 75% and 100% voluntary maximal clenching controlled by use of an audio feedback system, the sternocleidomastoid muscle activities, head posture, total locus length of head movement and body sway with and without the striking weight impact were analyzed and then discussed.Results and Discussion : The results obtained were as follows.1) The sternocleidomastoid muscle activities were increased with clenching force, and the activities with the striking weight impact were greater than that without the striking weight impact.2) The lateral bending, rotation and antero-postero flexion angle of the neck with the striking weight impact were decreased under the teeth clenching condition, compared to the non-clenching condition.3) The total locus length of head movement and body sway were shorter under the teeth clenching condition, compared to the non-clenching condition.4) Contrary to the non-clenching condition, under the teeth clenching condition, the ratio of the total locus length of head movement-body sway with the striking weight impact showed a similar value under the non-clenching condition without the striking weight impact5) There was no statistical significance in the relationship between clenching force and head movement / body sway.From the study, it was suggested that teeth clenching stabilized head in cooperation with the sternocleidomastoid muscle, and prevented the head movement and body sway with the striking weight impact. It was also suggested that the voluntary maximal clenching force was not necessary to prevent the head movement and body sway.

目的：本研究的目的是阐明在对股骨大转子施加冲击载荷时，咬牙对头部姿势和身体摆动的影响。在下颌静息位、25%、50%、75%和100%自主最大紧咬时，通过声音反馈系统控制胸锁乳突肌活动、头位、分析并讨论了有和没有撞击重量影响时头部运动和身体摇摆的总轨迹长度。结果和讨论：结果表明：（1）胸锁乳突肌活动随紧力的增加而增强，有冲击力时的活动量大于无冲击力时的活动量。2）侧屈，在咬牙条件下，颈部随重物冲击的旋转和前后屈角度减小，3）咬紧牙关状态下的头部运动和身体摆动的总轨迹长度较短，4）与非咬牙状态相反，在咬牙状态下，在无冲击力的情况下，头部运动-身体摆动的轨迹长度与冲击力的比值与非紧握状态下的相似。咬牙力与头部运动/身体摇摆的关系无统计学意义，提示咬牙与胸锁乳突肌协同作用稳定头部，防止头部运动和身体摇摆。研究还表明，不一定要有最大的主动握紧力才能防止头部运动和身体摇摆。