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| Content Provider | Springer Nature Link |
|---|---|
| Author | Runnalls, Keith D. Anson, Greg Byblow, Winston D. |
| Copyright Year | 2016 |
| Abstract | The use of arm weight support (WS) to optimize movement quality may be an avenue for improved upper limb stroke rehabilitation; however, the underlying neurophysiological effects of WS are not well understood. Rehabilitation exercises may be performed when sitting or standing, but the interaction of posture with WS has not been examined until now. We explored the effect of posture with WS on corticomotor excitability (CME) in healthy adults. Thirteen participants performed static shoulder abduction in two postures (sitting and standing) at three levels of WS (0, 45, and 90 % of full support). Transcranial magnetic stimulation of primary motor cortex was used to elicit motor-evoked potentials (MEPs) in eight upper limb muscles. Stimulus–response (SR) curves were fitted to the MEP data using nonlinear regression. Whole-body posture interacted with WS to influence tonic activity and CME in all muscles examined. SR curve parameters revealed greater CME when standing compared to sitting for upper arm muscles, but lower CME to the shoulder, forearm, and hand. Distal to the shoulder, tonic activity and CME were modulated independent of any explicit differences in task requirements. Overall, these results support a model of integrated upper limb control influenced by whole-body posture and WS. These findings have implications for the application of WS in settings such as upper limb rehabilitation after stroke. |
| Starting Page | 97 |
| Ending Page | 107 |
| Page Count | 11 |
| File Format | |
| ISSN | 00144819 |
| Journal | Experimental Brain Research |
| Volume Number | 235 |
| Issue Number | 1 |
| e-ISSN | 14321106 |
| Language | English |
| Publisher | Springer Berlin Heidelberg |
| Publisher Date | 2016-09-17 |
| Publisher Place | Berlin, Heidelberg |
| Access Restriction | One Nation One Subscription (ONOS) |
| Subject Keyword | Arm weight support Posture Motor cortical excitability Transcranial magnetic stimulation Integrated control Neurosciences Neurology |
| Content Type | Text |
| Resource Type | Article |
| Subject | Neuroscience |
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