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Upper Limb Motor Function in Hemiparesis: Concurrent Validity of the Arm Motor Ability Test

Chae, John MD, ME; Labatia, Ihab MD; Yang, Guang MD

American Journal of Physical Medicine & Rehabilitation: January 2003 - Volume 82 - Issue 1 - pp 1-8
Research Article: Stroke

Chae J, Labatia I, Yang G: Upper limb motor function in hemiparesis: Concurrent validity of the arm motor ability test. Am J Phys Med Rehabil 2003;82:1–8.

Objective: To evaluate the concurrent validity of the Arm Motor Ability Test (AMAT) using the Fugl-Meyer Assessment (FMA) as the criterion measure of poststroke upper limb motor impairment.

Design: Upper limb motor impairment and arm ability of 30 chronic stroke survivors were assessed with the FMA and AMAT, respectively. Spearman’s correlation coefficients were generated relating the components of FMA and AMAT. Scatterplots were generated to provide qualitative assessments of the relationship between FMA and AMAT. Bar graphs of FMA and AMAT normalized to their maximum scores were generated to compare the levels of motor status measured by each instrument.

Results: All components of AMAT correlated highly with FMA total (r = 0.92–0.94;P < 0.001). AMAT functional ability and AMAT quality of movement were linearly related with FMA total. However, AMAT time of performance exhibited significant ceiling and floor effects with respect to FMA. Normalized AMAT scores were generally lower than normalized FMA scores (P < 0.001), with the greatest difference in scores observed in subjects with more severe motor impairments.

Conclusion: This study demonstrates a high degree of concurrent criterion validity of the AMAT. However, AMAT tends to underestimate the arm motor status of those with more severe motor impairments.

From the Department of Physical Medicine and Rehabilitation, Case Western Reserve University at MetroHealth Medical Center, Cleveland, Ohio.

Supported, in part, by National Institutes of Health grants R29 HD35616-01, R01 HD39913, and T32HD07500.

FIM™ is a trademark of the Uniform Data System for Medical Rehabilitation, a division of UB Foundation Activities, Inc.

All correspondence and requests for reprints should be addressed to John Chae, MD, ME, Department of Physical Medicine and Rehabilitation, Case Western Reserve University at MetroHealth Medical Center, 2500 MetroHealth Drive, Cleveland, OH 44109.

© 2003 Lippincott Williams & Wilkins, Inc.