1 Centre of Metabolism, Ageing & Physiology (COMAP), MRC-Versus Arthritis Centre of Excellence for Musculoskeletal Ageing Research, Nottingham NIHR Biomedical Research Centre, School of Medicine, University of Nottingham, UK. Electronic address: mathew.piasecki@nottingham.ac.uk.
2 Department of Systems Design Engineering, University of Waterloo, Waterloo, ON, Canada.