1 Department of Exercise Sciences and Centre for Brain Research, University of Auckland, Auckland, New Zealand.
2 Department of Neurology, Division of Stroke Recovery and Neurorestoration, Neuroimaging and Stroke Recovery Laboratory, Beth Israel Deaconess Medical Center and Harvard Medical School, Boston, MA.
3 Maryland Exercise and Robotics Center of Excellence, Geriatrics Research Educational and Clinical Center, Department of Veterans Affairs, Baltimore, MD.
4 Laboratory for Research on Arm Function and Therapy, Older Americans Independence Center, Departments of Neurology, Physical Therapy and Rehabilitation Science, and Medicine/Division of Gerontology and Geriatric Medicine, University of Maryland, Baltimore, MD.
5 Departments of Neurology, Physical Therapy and Rehabilitation Science, and Medicine/Division of Gerontology and Geriatric Medicine, University of Maryland, Baltimore, MD.