A repeated measures observational study.
To investigate change in sagittal alignment of head and neck posture
in response to adjustments of an office chair
with and without a lumbar roll in situ
Summary of Background Data.
Forward head posture has been identified as a risk factor for neck pain, and there is evidence to show that ergonomic correction in sitting may reduce the incidence of pain. The effect placement of a lumbar roll
has on cervical spine posture has not been previously investigated experimentally but rather, is assumed to have a positive influence on head and neck posture
Thirty healthy male participants (18–30 years) were photographed while registered in the natural head resting position in each of 4 sitting positions with and without a lumbar roll in situ
. Two positions incorporated adjustments to the back rest and 1 to the seat pan of the office chair
. The craniovertebral (CV) angle, as a determinant of head and neck posture
was measured from the set of digitized photographs obtained for each participant. Comparisons between the CV angle in all postural registrations were made using a mixed model analysis adjusted for multiple comparisons.
Of the positions examined, significant differences in the mean CV angles were found with the backrest of the chair at 100° and at 110° (P
< 0.001). With the lumbar roll in situ
and the backrest position at 110°, there was a significant increase in the mean CV compared with the angle without the lumbar roll in situ
(2.32°, 95% confidence interval: 1.31–3.33; P
The degree of angulation of the backrest support of an office chair
plus the addition of lumbar roll
support are the 2 most important factors to be taken into account when considering seating factors likely to favorably change head and neck postural alignment, at least in asymptomatic subjects.