Do Dorsal Head Contact Forces Have the Potential to Identify Impairment During Graded Craniocervical Flexor Muscle Contractions?

Abstract

O’Leary S, Jull G, Vicenzino B. Do dorsal head contact forces have the potential to identify impairment during graded craniocervical flexor muscle contractions? Objective To determine if the force exerted onto the supporting surface by the dorsal head during graded contractions of isometric craniocervical flexion (ICCF) in the supine position has the potential to measure aberrant muscle performance between participant groups with and without painful neck disorders. Design Cross-sectional, between-participant study of the force exerted by the head on the supporting surface during ICCF muscle contractions. Setting Research laboratory. Participants Thirty-two participants with a history of neck pain and 32 asymptomatic control participants. Interventions Not applicable. Main Outcome Measure Dorsal head force (DHF), which is the force (in newtons) exerted by the head on the supporting surface during ICCF muscle contractions in the supine position. ICCF muscle contractions were performed at maximal voluntary contraction (MVC), and sustained at contractions of 50% of MVC and 20% of MVC. Results Both neck pain and control participants significantly increased their DHF on the supporting surface from resting values during all ICCF muscle contractions ( P<.001). No differences in DHF were found between symptomatic and control participants during any of the ICCF efforts. Conclusions It would appear that DHF exerted on the supporting surface during graded ICCF muscle contractions is similar between neck pain sufferers and control participants, and is therefore limited in its usefulness as a measurement of abnormal performance.