Effects of Cervical Manual Therapy on Cervicogenic Headache

C1/2 graded mobilizations (Grade III/IV) provided to C1/2 segment on ipsilateral side of unilateral headache. Mobilizations will be completed for 3 sets of 30 seconds.

C1/2 manipulation (Grade V) provided to C1/2 segment on ipsilateral side of unilateral headache. The goal of the manipulation technique is to elicit an audible cavitation. If no cavitation is achieved upon the first attempt, a second and final attempt will be completed. No more than two attempts will be utilized per each subject in this allocated group.