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Purpose <p>The goal of this study was to quantify the effect of initial head posture on neck muscle activity and head/neck kinematics during rear impacts.</p> Methods <p>Twelve seated participants experienced rear impacts on a sled with their head in five initial driving postures: left shoulder check, left mirror check, neutral head-forward, rear-view mirror check, or looking at their front-seat passenger. Electromyographic activity in four neck muscles was recorded bilaterally with indwelling electrodes and normalized to maximum voluntary contraction (MVC) levels. Head and torso kinematics were measured.</p> Results <p>Pre-impact muscle activity increased in 6 of the 8 muscles for non-neutral postures compared to the neutral posture (Δ = 0.6–7.5% MVC). During impact, only the peak left multifidus activity significantly changed (Δ = − 12% MVC) during left mirror check compared to neutral posture. Compared to the neutral posture, we observed larger absolute head acceleration (Δ = 0.7–2.6 g) out of the sagittal plane for all non-neutral postures and smaller fore-aft head-torso displacement (Δ = 5.2–7.8 mm) in the left shoulder check and look-at-passenger postures, but only minimal changes in torso kinematics.</p> Conclusion <p>Despite minimal changes to peak neck muscle activity during impact, we observed widespread changes in the head kinematics in non-neutral postures. This work provides data to inform injury prevention methods and simulate drivers with non-neutral head postures in computational models.</p>

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Initial Head Posture Affects the Neck Muscle and Head/Neck Kinematic Responses During Low-Speed Rear Impacts

  • 期刊论文

  • 发表日期：

    2025年12月18日

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  • Jason B. Fice,
  • Liam H. Foulger,
  • Daniel W. H. Mang,
  • Jean-Sébastien Blouin,
  • Gunter P. Siegmund

摘要

Purpose

The goal of this study was to quantify the effect of initial head posture on neck muscle activity and head/neck kinematics during rear impacts.

Methods

Twelve seated participants experienced rear impacts on a sled with their head in five initial driving postures: left shoulder check, left mirror check, neutral head-forward, rear-view mirror check, or looking at their front-seat passenger. Electromyographic activity in four neck muscles was recorded bilaterally with indwelling electrodes and normalized to maximum voluntary contraction (MVC) levels. Head and torso kinematics were measured.

Results

Pre-impact muscle activity increased in 6 of the 8 muscles for non-neutral postures compared to the neutral posture (Δ = 0.6–7.5% MVC). During impact, only the peak left multifidus activity significantly changed (Δ = − 12% MVC) during left mirror check compared to neutral posture. Compared to the neutral posture, we observed larger absolute head acceleration (Δ = 0.7–2.6 g) out of the sagittal plane for all non-neutral postures and smaller fore-aft head-torso displacement (Δ = 5.2–7.8 mm) in the left shoulder check and look-at-passenger postures, but only minimal changes in torso kinematics.

Conclusion

Despite minimal changes to peak neck muscle activity during impact, we observed widespread changes in the head kinematics in non-neutral postures. This work provides data to inform injury prevention methods and simulate drivers with non-neutral head postures in computational models.