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BACKGROUND

REMOTE VIBROTACTILE NOISE IMPROVES PHALANX FORCE DEVIATION DURING POWER GRIP IN STROKE SURVIVORS Leah R. Enders, M.S. , Na Jin Seo, Ph.D.

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BACKGROUND

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  1. REMOTE VIBROTACTILE NOISE IMPROVES PHALANX FORCE DEVIATION DURING POWER GRIP IN STROKE SURVIVORSLeah R. Enders, M.S. , Na Jin Seo, Ph.D. Stroke survivors’ grip is unstable and often leads to object dropping due to excessive deviation of phalanx forces from the normal direction [1-2]. This hampers their ability to complete daily tasks. It should not exceed angle=atan(COF) [1-2]. Tactile sensation is important for regulation of phalanx forces. Many stroke survivors experience hand somatosensory deficit [3] in addition to motor deficit. Fingertip tactile sensory deficit is linked to excessive phalanx force deviation. BACKGROUND Stroke survivors’ finger tactile sensation can be improved with remote vibrotactile noise [4]. OBJECTIVE To determine if remote vibrotactile noise that improves finger tactile sensation could reduce the excessive phalanx force deviation post stroke • Wells et al. 2005 • Seo NJ et al. Exp Brain Res 202, 891-901, 2010. • Mackenzie C.L & Iberall T. The Grasping Hand, North Holland, 1994. • Cary LM. Crit Rev Phys Rehabil Med7, 51-91, 1995. • Enders LR, et al. J Neuroeng and Rehabil 10, 105, 2013.

  2. METHODS Subjects: 13 chronic stroke survivors with tactile sensory deficit 7 chronic stroke survivors without tactile sensory deficit 13 age-matched healthy control individuals Subjects performed maximum power grip with vs. without vibrotactile noise applied at the dorsal wrist at an intensity of 60% sensory threshold. Dependant Variable: Phalanx force deviation =atan(ratio of shear force to normal force). Statistics with mixed-design ANOVA. RESULTS Phalanx force deviation was significantly reduced by 9% for all subject groups (p=.02 for noise main effect and p>.05 for noise and subject group interaction). * Remote vibrotactile noise improved finger tactile sensation in stroke survivors with sensory deficit (p<.01). * Slip threshold Phalanx Normal Force, N Phalanx Shear Force, N

  3. DISCUSSION/CONCLUSION This study showed that remote vibrotactile noise can reduce phalanx force deviation during power grip by improving finger tactile sensation. These results suggest that remote vibrotactile noise at the wrist is useful in improving not only finger sensation but also grip stability. The remote vibrotactile noise was helpful not only for stroke survivors with or without sensory deficit but also for old healthy adults, as seen by the improved phalanx force deviation for all subject groups. This study is important by suggesting that a device generating remote vibrotactile noise could be designed to improve grip stability and assist hand sensorimotor rehabilitation post-stroke. Such an assistive device worn at the wrist is expected not to interfere with dexterous hand-object manipulation and assist with activities of daily living. Safe Unsafe

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