sensory stimulation can improve motor function in ...
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sensory stimulation can improve motor function in ...
Some of the earliest signs of the damage caused by MS are changes in sensory function, which are strongly associated ... P < 0.05 relative to multiple sclerosis.
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SENSORY STIMULATION CAN IMPROVE MOTOR FUNCTION IN INDIVIDUALS WITH MULTIPLE SCLEROSIS Awad M. Almuklass1, 2, Robyn A. Capobianco1, Daniel F. Feeney1, and Roger M. Enoka 1 1University of Colorado Boulder, CO, USA. 2 King Saud bin Abdulaziz University for Health Sciences, Riyadh, Saudi Arabia
Introduction • Some of the earliest signs of the damage caused by MS are changes in sensory function, which are strongly associated with pro gressive declines in motor function. • Muscle function in persons with neurological impairments can be improved by providing supplementary synaptic input to spinal neurons from descending or afferent pathways during the performance of functional tasks. Such augmentation of neuronal activity is known as priming. • Purpose: to assess the capacity of sensory stimulation using augmented transcutaneous electrical nerve stimulation (aTENS) applied to leg and hand muscles to provide a priming action that can improve the performance of persons with MS on clinical tests of motor function. • Hypothesis: electrical stimulation of sensory fibers with aTENS acutely improves performance on clinical tests of motor function and reduces self-reported levels of walking disability.
Subjects and Methods Table 1. Descriptive statistics of the two groups. Multiple sclerosis
Men/Women 7/6 Age (yrs) 52 ± 8 Patient-Determined Disease Steps 2.8 ± 1.3 MS Walking Scale-12 36 ± 11 6-min walk (m) 397 ± 174 25-ft walk (s) 6.7 ± 3.0 Grooved pegboard (s) 110 ± 43 Chair-rise test (count) 11 ± 4
• Participants visited the lab on two occasions with one week between visits. • Each visit involved the participant performing four tests of motor function and completing two questionnaires about disability status. • The pads (Axelgaard) were attached during both visits and were placed over the hip flexors and dorsiflexors for the affected leg, and over the median nerve and the thenar eminence of the dominant hand. • Stimulus current (LG-TEC Elite Therapy System) was set slightly above motor threshold with a standard pulse width (0.20 ms) and frequency (50 Hz).
Figure 1. A person with MS (PDDS score = 4) who typically uses a walking aid (left) due to weakness of the left leg was able to walk without the aid when receiving TENS on his left thigh and lower leg (middle). He is holding the portable TENS unit in his left hand. The improvement in his gait is obvious one week later (right). He provided permission to share his images.
Results Table 2. Disability status and motor function outcomes with and without (Sham) the application of aTENS for the two groups of participants.
