CERVICAL EXTENSOR ENDURANCE TEST FOR WEAKNESS OF THE DEEP CERVICAL EXTENSORS Like the deep cervical flexors, the output of the deep cervical extensors are said to be changed in patients with neck pain. Sebastian et al. (2015) found a good inter-rater reliability of 0.8 for the CEET when measured with an inclinometer. Khalaee et al. (2017) have found higher levels of global muscle fatigability and smaller size of deep neck extensor muscles in chronic neck pain patients compared to the asymptomati