While gripping, lifting or manipulating an object such as drinking from a cup or placing a book on a shelf is usually easy for most, it can be challenging for those with neurological diseases such as multiple sclerosis or Parkinson's, or for people who had a stroke. For them, the tight gripping can cause fatigue, making everyday tasks difficult.
A team of University of Illinois at Chicago physical therapists report this month in the journal Neurorehabilitation and Neural Repair that persons with multiple sclerosis use excessive force when they are lifting objects. In an earlier finding reported in the journal Clinical Neurophysiology, they reported that regaining control and coordination may be as easy as applying a gentle touch to the affected hand from a finger of the opposite hand.
"We studied how this light touch application changes the way people apply force to an object they want to grip," said Alexander Aruin, professor of physical therapy. The study compared eight adults with multiple sclerosis to eight without the disease, gender-matched and of comparable age. "In each case, the grip force required to lift an object decreased," said Aruin.
He found similar results in an earlier study he did of people with arm weakness caused by a stroke.
Why the simple light finger touch application works so well is not fully understood, but Aruin offers a hypothesis.