Peer-Reviewed Publication
J Sports Sci2026;1-12.August 23, 2026Journal Article
From couch to Ironman 70.3: A three-year case study of weight loss and cardiometabolic adaptation revealed through continuous wearable monitoring.
Alexander H K Montoye1, Gregory J Grosicki2, Matthew C Babcock3,4, Finnbarr Fielding2, William von Hippel2, Christopher Chapman2, Dan Henderson5, Victoria H Lee6, Kristen E Holmes2
1Department of Exercise Science, Montcalm Community College, Sidney, MI, USA.
2Department of Performance Science and Health Outcomes, WHOOP, Inc., Boston, MA, USA.
3Department of Kinesiology and Health Sciences, Virginia Commonwealth University, Richmond, Virginia, USA.
4Department of Integrated Physiology, University of Colorado Anschutz Medical Campus, Aurora, CO, USA.
5Department of Medicine, Brigham and Women's Hospital, Boston, MA, USA.
6Department of Research, Algorithms, and Data Science, WHOOP Inc., Boston, MA, USA.
Abstract
This single-participant case study leverages 1,146 days of continuous monitoring to describe a three-year weight loss and fitness transformation in a highly motivated young adult male who achieved a 27.8% reduction in body weight and completed an Ironman 70.3 triathlon. Daily resting heart rate (RHR), heart rate variability (HRV; RMSSD), HRV coefficient of variation (HRV-CV), sleep, and physical a…
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