SPINE (Phila Pa 1976) 2003 (Apr 1); 28 (7): 671–679
Siegmund GP, et al
Study Design: Human subjects were exposed experimentally to a single whiplash-like perturbation.
Objective: To determine how awareness of the presence and timing of a whiplash-like perturbation affects the onset and amplitude of the neck
muscle response and the peak magnitude of head and neck kinematics.
Summary of Background Data: Although most whiplash injuries are sustained in rear-end collisions, which occur without warning, most studies of
whiplash injury have used subjects aware of the imminent perturbation.
Methods: Seated subjects (35 women and 31 men) underwent a single forward horizontal perturbation (peak acceleration, 1.5 g). Surface
electromyography measured the sternocleidomastoid and cervical paraspinal
muscle activity. Three awareness conditions were tested: a countdown for
subjects alerted to their perturbation, a perturbation without an alert
for subjects who expected it within 60 seconds, and an unexpected
perturbation for surprised subjects who were deceived.
Results: The muscle and kinematic responses of aware (alerted and
unalerted) subjects were not significantly different. Sternocleidomastoid
activation occurred 7 ms later in surprised subjects than in aware
subjects (P < 0.0002). Cervical paraspinal amplitudes were 260% larger
and angular head accelerations in flexion were 180% larger in surprised
male subjects than in alerted male subjects. Surprised female subjects
exhibited a 25% larger head retraction and a 30% lower forward
acceleration of the mastoid process than aware female subjects.
Conclusions: The larger retractions observed in surprised females likely produce larger tissue strains and may increase injury potential. Aware
human subjects may not replicate the muscle response, kinematic response,
or whiplash injury potential of unprepared occupants in real collisions.