Trunk muscle recruitment patterns in simulated precrash events
Journal article, 2018

Objectives: To quantify trunk muscle activation levels during whole body accelerations that simulate precrash events in multiple directions and to identify recruitment patterns for the development of active human body models. Methods: Four subjects (1 female, 3 males) were accelerated at 0.55 g (net Δv = 4.0 m/s) in 8 directions while seated on a sled-mounted car seat to simulate a precrash pulse. Electromyographic (EMG) activity in 4 trunk muscles was measured using wire electrodes inserted into the left rectus abdominis, internal oblique, iliocostalis, and multifidus muscles at the L2–L3 level. Muscle activity evoked by the perturbations was normalized by each muscle's isometric maximum voluntary contraction (MVC) activity. Spatial tuning curves were plotted at 150, 300, and 600 ms after acceleration onset. Results: EMG activity remained below 40% MVC for the three time points for most directions. At the 150- and 300  ms time points, the highest EMG amplitudes were observed during perturbations to the left (–90°) and left rearward (–135°). EMG activity diminished by 600 ms for the anterior muscles, but not for the posterior muscles. Conclusions: These preliminary results suggest that trunk muscle activity may be directionally tuned at the acceleration level tested here. Although data from more subjects are needed, these preliminary data support the development of modeled trunk muscle recruitment strategies in active human body models that predict occupant responses in precrash scenarios.

Impact biomechanics

trunk muscle

EMG

multidirectional perturbations

spatial tuning patterns

precrash

Author

Jóna Marin Olafsdottir

Chalmers, Mechanics and Maritime Sciences, Vehicle Safety

Jason B. Fice

University of British Columbia (UBC)

Daniel W.H. Mang

University of British Columbia (UBC)

Karin Brolin

Chalmers, Mechanics and Maritime Sciences, Vehicle Safety

Johan Davidsson

Chalmers, Mechanics and Maritime Sciences, Vehicle Safety

Jean-Sébastien Blouin

University of British Columbia (UBC)

Gunter P. Siegmund

MEA Forensic Engineers and Scientists

Traffic Injury Prevention

1538-9588 (ISSN) 1538-957X (eISSN)

Vol. 19 S186-S188

Subject Categories

Other Medical Engineering

Sport and Fitness Sciences

Physiology

DOI

10.1080/15389588.2018.1426917

More information

Latest update

5/30/2018