Subjects also had to have palpable cervical joint tenderness22 and demonstrate poor performance (unable to achieve 24 mm Hg) on the clinical test of craniocervical flexion as defined by Jull et al.
Further details of the test are presented in the “Exercise Regimens” section.
Subjects were excluded if they had undergone cervical spine surgery, reported any neurological signs, or had participated in a neck exercise program in the past 12 months.