Aging Clinical Trial
Official title:
Brain Networks of Turning Performance With Aging and Stroke
Older adults and stroke survivors often have difficulty performing complex walking tasks, due in part to changes in the brain. One task often overlooked is turning, which can lead to injury when performed poorly. The investigators will use non-invasive brain stimulation to assess brain activity and relate those observations to turning performance in older adults and stroke survivors.
This study is associated with an ongoing Clinical Trial (NCT03790657) called the CONTROL Walking Study, which combines locomotor learning and a form of non-invasive electrical brain stimulation call transcranial direct current stimulation (tDCS). The CONTROL Walking Study, randomly places participants into one of two experimental groups (transcranial direct current stimulation or sham stimulation). Following group placement participants complete a 2 week long walking and turning locomotor learning intervention while receiving a group dependent the form of tDCS or sham stimulation. In leveraging the CONTROL Walking Study infrastructure to further examine the neural control of turning while walking, which is often impaired for older adults and people who have had a stroke. This study will assess neurophysiological brain function using transcranial magnetic stimulation (TMS) which is a form of non-invasive brain stimulation as well as assessing multiple forms of turning performance in older adults. Transcranial magnetic stimulation (TMS) will be used to assess cortical inhibitory neurophysiological function in motor networks of the brain. Importantly, recent work demonstrates significant associations between brain excitatory/inhibitory function and turning performance in older adults, although these results remain largely preliminary. Therefore, the objective of this proposal is to further elucidate associations between neurophysiological function (measured with TMS) and 360 degree and 180 degree turning performance. The investigators will address the following specific aims: Specific Aim 1 will test the hypothesis that greater cortical inhibition will be associated with shorter turn duration for 360 degree turns and 180 degree turns. Specific Aim 2 will test the hypothesis that participants with greater baseline cortical inhibition will demonstrate larger 360 degree and 180 degree turning performance gains (i.e., shorter turn durations). This new knowledge will provide additional information as to the neural mechanisms associated with turning performance in older adults. Moreover, these results could reveal mechanistic targets for future interventions to enhance turning performance learning and retention. ;
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