Effects of Wrist Tendon Vibration on Targeted Upper-Arm Movements in Poststroke HemiparesisNeurorehabilitation and Neural Repair
Format of Original10 p.
Original Item IDdoi: 10.1177/1545968310378507
AbstractBackground. Impaired motor control of the upper extremity after stroke may be related to lost sensory, motor, and integrative functions of the brain. Artificial activation of sensory afferents might improve control of movement by adding excitatory drive to sensorimotor control structures. The authors evaluated the effect of wrist tendon vibration (TV) on paretic upper-arm stability during point-to-point planar movements. Methods. TV (70 Hz) was applied to the forearm wrist musculature of 10 hemiparetic stroke patients as they made center-out planar arm movements. End-point stability, muscle activity, and grip pressure were compared as patients stabilized at the target position for trials completed before, during, and after the application of the vibratory stimulus. Results. Prior to vibration, hand position fluctuated as participants attempted to maintain the hand at the target after movement termination. TV improved arm stability, as evidenced by decreased magnitude of hand tangential velocity at the target. Improved stability was accompanied by a decrease in muscle activity throughout the arm as well as a mean decrease in grip pressure. Conclusions. These results suggest that vibratory stimulation of the distal wrist musculature enhances stability of the proximal arm and can be studied further as a mode for improving end-point stability during reaching in hemiparetic patients.
Citation InformationMegan O. Conrad, Robert A. Scheidt and Brian D. Schmit. "Effects of Wrist Tendon Vibration on Targeted Upper-Arm Movements in Poststroke Hemiparesis" Neurorehabilitation and Neural Repair (2011) ISSN: 1552-6844
Available at: http://works.bepress.com/robert_scheidt/41/