Machine-learning-based head impact subtyping based on the spectral densities of the measurable head kinematics  

作　　者：Xianghao Zhan Yiheng Li Yuzhe Liu Nicholas J.Cecchi Samuel J.Raymond Zhou Zhou Hossein Vahid Alizadeh Jesse Ruan Saeed Barbat Stephen Tiernan Olivier Gevaert Michael M.Zeineh Gerald A.Grant David B.Camarillo 

机构地区：[1]Department of Bioengineering,Stanford University,Stanford,CA 94305,USA [2]Department of Biomedical Data Science,Stanford University,Stanford,CA 94305,USA [3]Ford Motor Company,3001 Miller Rd,Dearborn,MI 48120,USA [4]Technological University Dublin,Dublin,D07 EWV4,Ireland [5]Department of Radiology,Stanford University,Stanford,CA 94305,USA [6]Department of Neurosurgery,Stanford University,Stanford,CA 94305,USA

出　　处：《Journal of Sport and Health Science》2023年第5期619-629,F0003,共12页运动与健康科学（英文）

基　　金：supported by the Pac-12 Conference’s Student-Athlete Health and Well-Being Initiative,the National Institutes of Health (R24NS098518);Stanford Department of Bioengineering。

摘　　要：Background:Traumatic brain injury can be caused by head impacts,but many brain injury risk estimation models are not equally accurate across the variety of impacts that patients may undergo,and the characteristics of different types of impacts are not well studied.We investigated the spectral characteristics of different head impact types with kinematics classification.Methods:Data were analyzed from 3262 head impacts from lab reconstruction,American football,mixed martial arts,and publicly available car crash data.A random forest classifier with spectral densities of linear acceleration and angular velocity was built to classify head impact types(e.g.,football,car crash,mixed martial arts).To test the classifier robustness,another 271 lab-reconstructed impacts were obtained from 5 other instrumented mouthguards.Finally,with the classifier,type-specific,nearest-neighbor regression models were built for brain strain.Results:The classifier reached a median accuracy of 96% over 1000 random partitions of training and test sets.The most important features in the classification included both low-and high-frequency features,both linear acceleration features and angular velocity features.Different head impact types had different distributions of spectral densities in low-and high-frequency ranges(e.g.,the spectral densities of mixed martial arts impacts were higher in the high-frequency range than in the low-frequency range).The type-specific regression showed a generally higher R2value than baseline models without classification.Conclusion:The machine-learning-based classifier enables a better understanding of the impact kinematics spectral density in different sports,and it can be applied to evaluate the quality of impact-simulation systems and on-field data augmentation.

关 键 词：Classification Contact sports Head impacts Impact kinematics Traumatic brain injuryTagedAPTARAEnd 

分 类 号：R318.01[医药卫生—生物医学工程]