Experimental Brain Research

, Volume 166, Issue 1, pp 126–136 | Cite as

Deficits in grasp versus reach during acute hemiparesis

  • Catherine E. Lang
  • Joanne M. Wagner
  • Amy J. Bastian
  • Qingli Hu
  • Dorothy F. Edwards
  • Shirley A. Sahrmann
  • Alexander W. Dromerick
Research Article

Abstract

We studied how acute hemiparesis affects the ability to perform purposeful movements of proximal versus distal upper extremity segments. Given the gradient of corticospinal input to the spinal motoneuron pools, we postulated that movement performance requiring distal segment control (grasping) should be more impaired than movement performance requiring proximal segment control (reaching) in people with hemiparesis. We tested subjects with acute hemiparesis and control subjects performing reach and reach-to-grasp movements. Three characteristics of movement performance were quantified for each movement: speed, accuracy, and efficiency. For the reach, we calculated peak wrist velocity, endpoint error, and reach path ratio. For the grasp, we calculated peak aperture rate, aperture at touch, and aperture path ratio. To evaluate the relative deficits in reaching versus grasping, performance measures were converted to z-scores using control group means and standard deviations. For both the movements, movement times were longer and performance was more variable in the hemiparetic group compared to the control group. Hemiparetic z-scores indicated that relative deficits in movement speed were small in the two movements, with deficits in grasp being slightly greater than deficits in reach. Relative deficits in accuracy showed a trend for being larger in the reach compared to the grasp, but this difference did not reach statistical significance. In contrast, relative deficits in efficiency were larger in the grasp compared to the reach, with reaching efficiency near the range of normal performance. When considering data across all three movement characteristics, the ability to perform a purposeful movement with the distal segments was not clearly more disrupted than the ability to perform a purposeful movement with the proximal segments in people with acute hemiparesis.

Keywords

Stroke Upper extremity Human Prehension Motor cortex Corticospinal tract 

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Copyright information

© Springer-Verlag 2005

Authors and Affiliations

  • Catherine E. Lang
    • 1
  • Joanne M. Wagner
    • 1
  • Amy J. Bastian
    • 4
  • Qingli Hu
    • 3
  • Dorothy F. Edwards
    • 2
    • 3
  • Shirley A. Sahrmann
    • 1
    • 2
    • 3
  • Alexander W. Dromerick
    • 1
    • 2
    • 3
  1. 1.Program in Physical TherapyWashington UniversitySt LouisUSA
  2. 2.Program in Occupational TherapyWashington UniversitySt LouisUSA
  3. 3.Department of NeurologyWashington UniversitySt LouisUSA
  4. 4.Kennedy Krieger Institute, Department of NeurologyJohns Hopkins UniversityBaltimoreUSA

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