1. Canadian Centre for Activity and Aging, School of Kinesiology, Faculty of Health Sciences; University of Western Ontario; London Ontario Canada
2. Department of Physiology; University of Arizona; Tucson Arizona USA
3. Human Performance Laboratory; University of Calgary; Calgary Alberta Canada
4. Department of Physical Medicine and Rehabilitation; University of Western Ontario; London Ontario Canada
5. Department of Anatomy and Cell Biology, Schulich School of Medicine and Dentistry; University of Western Ontario; London Ontario N6G 1H1 Canada