Newell K M, Sprague R L, Pain M T, Deutsch K M, Meinhold P
Department of Kinesiology, The Pennsylvania State University, University Park 16802, USA.
Am J Ment Retard. 1999 Jan;104(1):11-21. doi: 10.1352/0895-8017(1999)104<0011:DOSB>2.0.CO;2.
Self-injurious behavior was examined in a case study of head-banging by an 8-year-old girl with profound mental retardation and an autistic disorder. Trajectories of the arm movements and impact forces of the head blows were determined from a dynamic analysis of videotapes. Results revealed a high degree of cycle-to-cycle consistency in the qualitative dynamics of the limb motions, with one hand motions being faster than those with two hands (inphase and antiphase) and the motions with the helmet about 25% faster than those without the helmet. The impact force of SIBs as a percentage of body weights are near the low end of forces generated in boxing blows and karate hits.
在一项针对一名患有严重智力障碍和自闭症的8岁女孩撞头行为的案例研究中，对自我伤害行为进行了考察。通过对录像带的动态分析，确定了手臂运动轨迹和头部撞击的冲击力。结果显示，肢体运动的定性动力学在周期与周期之间具有高度一致性，单手运动比双手运动（同相和反相）更快，戴头盔时的运动比不戴头盔时快约25%。自我伤害行为的冲击力占体重的百分比接近拳击打击和空手道攻击所产生力量的低端。
