Using Grasping Tasks to Evaluate Hand Force Coordination in Children With Hemiplegic Cerebral Palsy  Samuel J. Mackenzie, MS, Nancy Getchell, PhD, Christopher M. Modlesky, PhD, Freeman Miller, MD, Slobodan Jaric, PhD  Archives of Physical Medicine and Rehabilitation  Volume 90, Issue 8, Pages 1439-1442 (August 2009) DOI: 10.1016/j.apmr.2009.02.014 Copyright © 2009 American Congress of Rehabilitation Medicine Terms and Conditions

Fig 1 Illustration of the device: unimanual or bimanual precision grasp (fingers and the thumbs illustrated by circles) is applied against the handles that are either externally fixed or free to move. Each handle records the vertical force acting tangentially (L) and the grip force (G) acting perpendicularly. Abbreviation: G, grip force; L, load force. Archives of Physical Medicine and Rehabilitation 2009 90, 1439-1442DOI: (10.1016/j.apmr.2009.02.014) Copyright © 2009 American Congress of Rehabilitation Medicine Terms and Conditions

Fig 2 Time series of the grip and load forces obtained from representative CP (left panel) and typically developing ([TD] right panel) participants in the ramp (A–F) and oscillation task (G–H). Solid lines represent load force (L), dashed lines represent grip force (G), and black and gray lines represent the noninvolved and involved side, respectively. Horizontal lines (G–H) represent the target levels for L. Note the overscaled G in the tasks performed by involved hand of the representative participant with CP. Archives of Physical Medicine and Rehabilitation 2009 90, 1439-1442DOI: (10.1016/j.apmr.2009.02.014) Copyright © 2009 American Congress of Rehabilitation Medicine Terms and Conditions