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The Effect of Muscle Activation on Head Kinematics During Non-injurious Head Impacts in Human Subjects.
Annals of Biomedical Engineering ( IF 3.8 ) Pub Date : 2020-09-14 , DOI: 10.1007/s10439-020-02609-7
Kristen A Reynier 1 , Ahmed Alshareef 1 , Erin J Sanchez 2 , Daniel F Shedd 1 , Samuel R Walton 3 , Nicholas K Erdman 3 , Benjamin T Newman 4 , J Sebastian Giudice 1 , Michael J Higgins 3 , James R Funk 2 , Donna K Broshek 5 , Thomas J Druzgal 4 , Jacob E Resch 3 , Matthew B Panzer 1
Affiliation  

In this study, twenty volunteers were subjected to three, non-injurious lateral head impacts delivered by a 3.7 kg padded impactor at 2 m/s at varying levels of muscle activation (passive, co-contraction, and unilateral contraction). Electromyography was used to quantify muscle activation conditions, and resulting head kinematics were recorded using a custom-fit instrumented mouthpiece. A multi-modal battery of diagnostic tests (evaluated using neurocognitive, balance, symptomatic, and neuroimaging based assessments) was performed on each subject pre- and post-impact. The passive muscle condition resulted in the largest resultant head linear acceleration (12.1 ± 1.8 g) and angular velocity (7.3 ± 0.5 rad/s). Compared to the passive activation, increasing muscle activation decreased both peak resultant linear acceleration and angular velocity in the co-contracted (12.1 ± 1.5 g, 6.8 ± 0.7 rad/s) case and significantly decreased in the unilateral contraction (10.7 ± 1.7 g, 6.5 ± 0.7 rad/s) case. The duration of angular velocity was decreased with an increase in neck muscle activation. No diagnostic metric showed a statistically or clinically significant alteration between baseline and post-impact assessments, confirming these impacts were non-injurious. This study demonstrated that isometric neck muscle activation prior to impact can reduce resulting head kinematics. This study also provides the data necessary to validate computational models of head impact.



中文翻译:

肌肉激活对人类受试者非伤害性头部撞击期间头部运动学的影响。

在这项研究中,20 名志愿者在不同程度的肌肉激活(被动、共同收缩和单侧收缩)下,以 2 m/s 的速度接受了 3.7 kg 衬垫撞击器提供的 3 次非伤害性头部侧面撞击。肌电图用于量化肌肉激活条件,并使用定制的仪器咬嘴记录由此产生的头部运动。对每个受试者在撞击前和撞击后进行了一系列多模式诊断测试(使用基于神经认知、平衡、症状和神经影像学的评估进行评估)。被动肌肉状况导致最大的合成头部线性加速度 (12.1 ± 1.8 g) 和角速度 (7.3 ± 0.5 rad/s)。与被动激活相比,增加肌肉激活降低了共同收缩 (12.1 ± 1.5 g, 6.8 ± 0.7 rad/s) 情况下的峰值合成线性加速度和角速度,并在单侧收缩 (10.7 ± 1.7 g, 6.5 ± 0.7 rad/s) 情况下显着降低) 案件。角速度的持续时间随着颈部肌肉激活的增加而减少。没有诊断指标显示基线和影响后评估之间有统计学或临床上的显着变化,证实这些影响是无害的。该研究表明,撞击前等长颈部肌肉激活可以减少由此产生的头部运动。这项研究还提供了验证头部撞击计算模型所需的数据。7 rad/s) 情况。角速度的持续时间随着颈部肌肉激活的增加而减少。没有诊断指标显示基线和影响后评估之间有统计学或临床上的显着变化,证实这些影响是无害的。该研究表明,撞击前等长颈部肌肉激活可以减少由此产生的头部运动。这项研究还提供了验证头部撞击计算模型所需的数据。7 rad/s) 情况。角速度的持续时间随着颈部肌肉激活的增加而减少。没有诊断指标显示基线和影响后评估之间有统计学或临床上的显着变化,证实这些影响是无害的。该研究表明,撞击前等长颈部肌肉激活可以减少由此产生的头部运动。这项研究还提供了验证头部撞击计算模型所需的数据。这项研究表明,在撞击之前等长颈部肌肉激活可以减少由此产生的头部运动。这项研究还提供了验证头部撞击计算模型所需的数据。该研究表明,撞击前等长颈部肌肉激活可以减少由此产生的头部运动。这项研究还提供了验证头部撞击计算模型所需的数据。

更新日期:2020-09-14
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