A study on occupant kinematics behaviour and muscle activities during pre-impact braking based on volunteer tests

Susumu Ejima, Koshiro Ono, Sven Holcombe, Koji Kaneoka, Makoto Fukushima

Research output: Chapter in Book/Report/Conference proceedingConference contribution

33 Citations (Scopus)

Abstract

The objective of the current study is to analyze the influence of changes of the physical motion on human body under low-level impact accelerations. Five human volunteers in good health participated in the experiment under the supervision of an ethics committee. Each subject sat on a seat mounted on the sled that glided forward on the rails and simulated actual car motion when the passenger applied the emergency brake. Applied acceleration was around 1.0 g. During the experiments, the physical motion (measured by three-dimensional motion capturing system), acceleration, and EMG signals were recorded. In the relaxed case, muscle responses were observed to start activating at around 100ms after the impact, when the pelvis acceleration was at its peak value due to the interaction between the lumbar spine and the seat. Depending on the location within the body, the reflex time of each muscle is different. Furthermore, the head-neck-torso accelerations were strongly influenced by the muscle activities after impact. These results can contribute in clarifying the relationship between the physical motion and muscle forces with respect to the difference in activation level of muscles. This study was also design to establish an injury prediction approach to verify the influence of human body posture changes just before impact on the occupant injuries in a traffic accident.

Original languageEnglish
Title of host publicationInternational Research Council on the Biomechanics of Injury - 2007 International IRCOBI Conference on the Biomechanics of Injury, Proceedings
Pages31-45
Number of pages15
Publication statusPublished - 2007 Dec 1
Externally publishedYes
Event2007 International IRCOBI Conference on the Biomechanics of Injury - Maastricht, Netherlands
Duration: 2007 Sep 192007 Sep 21

Publication series

NameInternational Research Council on the Biomechanics of Injury - 2007 International IRCOBI Conference on the Biomechanics of Injury, Proceedings

Conference

Conference2007 International IRCOBI Conference on the Biomechanics of Injury
CountryNetherlands
CityMaastricht
Period07/9/1907/9/21

Keywords

  • Effect of muscles
  • Impact biomechanics
  • Low-speed front impact
  • Pre-braking

ASJC Scopus subject areas

  • Clinical Biochemistry

Fingerprint Dive into the research topics of 'A study on occupant kinematics behaviour and muscle activities during pre-impact braking based on volunteer tests'. Together they form a unique fingerprint.

  • Cite this

    Ejima, S., Ono, K., Holcombe, S., Kaneoka, K., & Fukushima, M. (2007). A study on occupant kinematics behaviour and muscle activities during pre-impact braking based on volunteer tests. In International Research Council on the Biomechanics of Injury - 2007 International IRCOBI Conference on the Biomechanics of Injury, Proceedings (pp. 31-45). (International Research Council on the Biomechanics of Injury - 2007 International IRCOBI Conference on the Biomechanics of Injury, Proceedings).