Wednesday, January 17th, 2018
Arm and HandElectrical StimulationNeuroplasticityOccupational TherapyRobotics
Intensive therapy can help people who have suffered a stroke recover motor function—even if the treatment begins a year or more after the stroke occurred. After a stroke, the brain and body can start recovering immediately and can show improvement up to six months afterward.
Inability to combine regular motions—for example, flexing the shoulder and simultaneously extending the elbow while reaching for an object—can be one result of a stroke. The patient may concentrate on the reaching movement of the arm, but the normal neural pathways are interrupted, and the patient’s arm may flex inward toward the body instead of extending to reach for a glass of water or a fork, says Daly, who is also the director of the National Veterans Affairs Brain Rehabilitation Research Center of Excellence in Gainesville and lead author of a stroke study published in 2014 in Archives of Physical Medicine and Rehabilitation.
Daly compared motor learning rehabilitation after stroke to learning a new sport move, such as a beginner learning how to serve in tennis. In this type of rehabilitation, patients must concentrate on performing a movement as deliberately as possible, with as much normal movement as possible, and must practice the task repetitively.
“Think about a child learning to walk or to ride a bicycle,” Daly says. “They must practice over and over until they come close to perfection.”
In electrical stimulation rehabilitation, electrodes comfortably stimulated the muscles on a person’s forearm and caused the hand to lift. Participants in the robotics-assisted rehabilitation group practiced the reach movement using robot software. The software guided them to attempt to reach targets displayed on a computer monitor. Their forearm and hand were cradled in a support so participants could concentrate on moving the shoulder and elbow.
One group received five hours per day of motor learning alone, while the other two groups received motor learning for 3 1/2 hours and electrical stimulation or robotics-assisted rehabilitation for the remaining 1 1/2 hours per day. All three groups received some motor learning rehabilitation. Each of the groups improved significantly, on average doubling or nearly doubling their scores on a scale that assesses coordination.
The recovery for all three groups was equal, with no statistically significant difference between the groups. The researchers named a small sample size as a potential limitation of the study, pointing out that there might have been statistical differences in the results between groups if the group sizes had been larger.
“Often after stroke, people can recover normal function without intensive treatment, in response to normal protective physiological processes. Some people recover quite well and can function normally.” Daly says.
“For this study, however, we enrolled people who had a stroke a year or more prior to their study participation, and who were still severely impaired. The magnitude of recovery we observed in our study is higher than any other studies that have been published so far, which supports the promise of longer treatment and more intensive treatment after stroke, even for those who are more severely impaired.”
The Department of Veterans Affairs funded the study.
Source: University of Florida