Do Dorsal Head Contact Forces Have the Potential to Identify Impairment During Graded Craniocervical Flexor Muscle Contractions?  Shaun O’Leary, MPhty, Gwendolen Jull, PhD, Bill Vicenzino, PhD  Archives of Physical Medicine and Rehabilitation  Volume 86, Issue 9, Pages 1763-1766 (September 2005) DOI: 10.1016/j.apmr.2005.06.002 Copyright © 2005 American Congress of Rehabilitation Medicine and the American Academy of Physical Medicine and Rehabilitation Terms and Conditions

Fig 1 DHF exerted onto (1) the supporting surface was measured by (2) the load cell positioned under the supporting surface and converted to the appropriate force (in newtons). The vector D indicates the direction of DHF. Participants performed ICCF against (3) the application pad and resistance arm of the dynamometer that deflected (4) a second load cell about the dynamometer axis (A). The force thus applied to the application arm was converted to an appropriate torque measurement (in newton meters). Participants received (5) visual feedback of their ICCF torque amplitude, allowing tests to be performed at MVC20 and MVC50 intensities. The dynamometer axis was aligned to the participant’s 0/C1 axis of rotation. Archives of Physical Medicine and Rehabilitation 2005 86, 1763-1766DOI: (10.1016/j.apmr.2005.06.002) Copyright © 2005 American Congress of Rehabilitation Medicine and the American Academy of Physical Medicine and Rehabilitation Terms and Conditions