Department of Mechanical Engineering, École de technologie supérieure, 1100 Notre-Dame Street West, Montreal, QC, H3C 1K3, Canada.
Centre intégré universitaire de santé et de services sociaux du Nord-de-l'Île-de-Montréal, Montreal, Canada.
Ann Biomed Eng. 2024 Aug;52(8):2134-2150. doi: 10.1007/s10439-024-03514-z. Epub 2024 May 17.
Recorded head kinematics from head-impact measurement devices (HIMd) are pivotal for evaluating brain stress and strain through head finite element models (hFEM). The variability in kinematic recording windows across HIMd presents challenges as they yield inconsistent hFEM responses. Despite establishing an ideal recording window for maximum principal strain (MPS) in brain tissue, uncertainties persist about the impact characteristics influencing vulnerability when this window is shortened. This study aimed to scrutinize factors within impact kinematics affecting the reliability of different recording windows on whole-brain peak MPS using a validated hFEM. Utilizing 53 on-field head impacts recorded via an instrumented mouthguard during a Canadian varsity football game, 10 recording windows were investigated with varying pre- and post-impact-trigger durations. Tukey pair-wise comparisons revealed no statistically significant differences in MPS responses for the different recording windows. However, specific impacts showed marked variability up to 40%. It was found, through correlation analyses, that impacts with lower peak linear acceleration exhibited greater response variability across different pre-trigger durations. Signal shape, analyzed through spectral analysis, influenced the time required for MPS development, resulting in specific impacts requiring a prolonged post-trigger duration. This study adds to the existing consensus on standardizing HIMd acquisition time windows and sheds light on impact characteristics leading to peak MPS variation across different head impact kinematic recording windows. Considering impact characteristics in research assessments is crucial, as certain impacts, affected by recording duration, may lead to significant errors in peak MPS responses during cumulative longitudinal exposure assessments.
记录头部冲击测量设备（HIMd）的头部运动学对于通过头部有限元模型（hFEM）评估大脑的应力和应变至关重要。HIMd 中的运动学记录窗口的可变性带来了挑战，因为它们会产生不一致的 hFEM 响应。尽管已经为脑组织中的最大主应变（MPS）确定了理想的记录窗口，但当缩短该窗口时，影响脆弱性的冲击特征仍然存在不确定性。本研究旨在利用经过验证的 hFEM，仔细研究冲击运动学中的因素，这些因素会影响整个大脑峰值 MPS 的不同记录窗口的可靠性。利用在加拿大大学足球比赛中通过仪器化牙套记录的 53 个现场头部冲击，研究了 10 个具有不同预冲击和后冲击触发持续时间的记录窗口。通过 Tukey 成对比较，发现不同记录窗口的 MPS 响应没有统计学上的显著差异。然而，特定的冲击显示出高达 40%的明显变化。通过相关分析发现，峰值线性加速度较低的冲击在不同的预触发持续时间内表现出更大的响应可变性。通过频谱分析分析的信号形状影响 MPS 发展所需的时间，导致特定的冲击需要延长后触发持续时间。这项研究增加了关于 HIMd 采集时间窗口标准化的现有共识，并揭示了导致不同头部冲击运动学记录窗口中峰值 MPS 变化的冲击特征。在研究评估中考虑冲击特征至关重要，因为某些受记录持续时间影响的冲击可能会导致在累积纵向暴露评估中峰值 MPS 响应出现重大误差。
