Concern about the consequences of head impacts in US football has motivated researchers to investigate and develop instrumentation to measure the severity of these impacts. However, the severity of head impacts in unhelmeted sports is largely unknown as miniaturised sensor technology has only recently made it possible to measure these impacts in vivo. The objective of this study was to measure the linear and angular head accelerations in impacts in mixed martial arts, and correlate these with concussive injuries. Thirteen mixed martial arts fighters were fitted with the Stanford instrumented mouthguard (MiG2.0) participated in this study. The mouthguard recorded linear acceleration and angular velocity in 6 degrees of freedom. Angular acceleration was calculated by differentiation. All events were video recorded, time stamped and reported impacts confirmed. A total of 451 verified head impacts above 10g were recorded during 19 sparring events (n = 298) and 11 competitive events (n = 153). The average resultant linear acceleration was 38.0624.3g while the average resultant angular acceleration was 256761739 rad/s2. The competitive bouts resulted in five concussions being diagnosed by a medical doctor. The average resultant acceleration (of the impact with the highest angular acceleration) in these bouts was 86.7618.7g and 756163438 rad/s2. The average maximum Head Impact Power was 20.6kW in the case of concussion and 7.15kW for the uninjured athletes. In conclusion, the study recorded novel data for sub-concussive and concussive impacts. Events that resulted in a concussion had an average maximum angular acceleration that was 24.7% higher and an average maximum Head Impact Power that was 189% higher than events where there was no injury. The findings are significant in understanding the human tolerance to short-duration, high linear and angular accelerations.

对美国橄榄球头部撞击后果的担忧促使研究人员调查和开发仪器来衡量这些影响的严重程度。然而，在不戴头盔的运动中头部撞击的严重程度在很大程度上尚不清楚，因为微型传感器技术最近才使得在体内测量这些撞击成为可能。本研究的目的是测量混合武术撞击时的线性和角头部加速度，并将其与脑震荡损伤相关联。13 名佩戴斯坦福仪器护齿器 (MiG2.0) 的综合格斗选手参与了这项研究。护齿套记录了 6 个自由度的线性加速度和角速度。通过微分计算角加速度。所有事件均被视频记录，时间戳和报告的影响得到确认。在 19 场陪练比赛（n = 298）和 11 场竞技比赛（n = 153）中，总共记录了 451 次超过 10g 的头部撞击。平均合成线加速度为 38.0624.3g，平均合成角加速度为 256761739 rad/s2。比赛中医生诊断出五人脑震荡。这些比赛中的平均合成加速度（具有最高角加速度的撞击）为 86.7618.7g 和 756163438 rad/s2。脑震荡情况下的平均最大头部冲击功率为 20.6kW，未受伤运动员的平均最大头部冲击功率为 7.15kW。总之，该研究记录了亚震荡和震荡影响的新数据。导致脑震荡的事件的平均最大角加速度为 24。比没有受伤的赛事高 7%，平均最大头部冲击力高 189%。这些发现对于理解人类对短时、高线性和角加速度的耐受性具有重要意义。