Objective: To measure the deep neck flexor muscle function for its contribu
tion to cervical segmental stabilization.
Methods: A staged test of deep neck flexor action, cranio-cervical flexion,
was devised. Activity in the superficial neck flexors [electromyography] a
nd the change in shape of the cervical curve, aligned to deep flexor contra
ction [pressure sensor] was measured, in whiplash subjects and asymptomatic
controls.
Results: Whiplash subjects used more activity in superficial muscles in the
test and were less able to control pressure changes than controls.
Conclusion: The test appears to detect poorer motor control in the neck fle
xors in whiplash subjects, the increased co-activation of the superficial n
eck flexors being a likely compensation for reduced deep neck flexor functi
on.