A new study has shown that gentle touch may help people with multiple sclerosis, who use excessive force when they are holding, lifting or manipulating objects such as drinking from a cup or placing a book on a shelf.
The study, conducted by researchers at the University of Illinois at Chicago, has been reported this month in the journal Neurorehabilitation and Neural Repair.
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.
Aruin didn't understand why the simple light finger touch application works so well is not fully understood, but he offers a hypothesis.
"It could be due to auxiliary sensory information from the contra-lateral arm. When we use our second hand and touch the wrist of the target hand, available information to the central nervous system about the hand-object interaction may increase. Without the touch, the information needed to manipulate an object comes only through vision and sensory input from just the target arm and hand," he said.
Aruin and his colleagues tested subjects griping and lifting a variety of objects that they moved in several different ways, directions and velocities. The gentle finger touch always helped to reduce grip force, making the task easier.
"We know that MS patients are prone to fatigue and muscle weakness. This finding may enable them to perform daily activities more independently to improve their quality of life," Aruin said.