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An envelope of linear and rotational head motion during everyday activities

  • Logan E. MillerEmail author
  • Jillian E. Urban
  • Vincent M. Whelan
  • Walt W. Baxter
  • Stephen B. Tatter
  • Joel D. Stitzel
Original Paper
  • 116 Downloads

Abstract

Various studies have characterized head kinematics in specific everyday activities by looking at linear and/or rotational acceleration characteristics, but each has evaluated a limited number of activities. Furthermore, these studies often present dissimilar and sometimes incomplete descriptions of the resulting kinematics, so the characteristics of normal everyday activities as a whole are not easily collectively summarized. The purpose of this study was to evaluate the literature investigating head kinematics associated with everyday activities and to generate a comprehensive kinematic boundary envelope describing these motions. The envelope constructed constitutes the current state of published knowledge regarding ‘normally occurring’ head accelerations. The envelope of kinematics represents activities commonly encountered and posing zero to minimal risk of injury to healthy individuals. Several kinematic measures, including linear accelerations, rotational velocities, and rotational accelerations, one may encounter as a result of normal everyday activities are summarized. A total of 11 studies encompassing 49 unique activities were evaluated. Examples of activities include sitting in a chair, jumping off a step, running, and walking. The peak resultant linear accelerations of the head reported in the literature were all less than 15 g, while the peak resultant rotational accelerations and rotational velocities approach 1375 rad/s2 and 12.8 rad/s, respectively. The resulting design envelope can be used to understand the range of acceleration magnitudes a typical active person can expect to experience. The results are also useful to compare to other activities exposing the head to motion or impact including sports, military, automotive, aerospace and other sub-injurious and injurious events.

Keywords

Brain injury Finite element model Strain Daily head accelerations Kinematics 

Notes

Acknowledgements

The authors would like to thank Medtronic for their support and collaboration during this project.

Compliance with ethical standards

Conflict of interest

The authors declare that they have no conflict of interest.

Funding

This study was funded by Medtronic.

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Copyright information

© Springer-Verlag GmbH Germany, part of Springer Nature 2019

Authors and Affiliations

  1. 1.Wake Forest University School of MedicineWinston-SalemUSA
  2. 2.Virginia Tech-Wake Forest University School of Biomedical Engineering and SciencesWinston-SalemUSA
  3. 3.Medtronic Inc.MinneapolisUSA

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