1. Decreased isometric neck strength in women with chronic neck pain and the repeatability of neck strength measurements1 
Jari Ylinen, MD, Petri Salo, PT, Matti Nykänen, MD, Hannu Kautiainen, BA, Arja Häkkinen, PhD 
Archives of Physical Medicine and Rehabilitation 
Volume 85, Issue 8, Pages (August 2004)
DOI: /j.apmr

2. Fig 1
Neck strength measurement system consists of 2 parts having strain gauges of their own. Rotator muscle strength is measured with the part above the head, which is attached on both sides of the head by 4 pads. Flexor and extensor muscle strength is measured with the pad, which is now supporting the head, but which is lifted up to the level of the forehead and occiput on these tests.
Archives of Physical Medicine and Rehabilitation  , DOI: ( /j.apmr )

3. Fig 2
The difference in peak flexion and extension strength (N) between the first and second measurements, plotted against their mean for each patient. Dotted lines show 95% limits of agreement.
Archives of Physical Medicine and Rehabilitation  , DOI: ( /j.apmr )

4. Fig 3
The difference of peak rotation strength (Nm) between the first and second measurement, plotted against their means for each patient. Dotted lines show 95% limits of agreement.
Archives of Physical Medicine and Rehabilitation  , DOI: ( /j.apmr )