CONFLICT OF INTEREST STATEMENT The authors have declared no conflicting interests. Supporting Information Filename Description evj14438-sup-0001-DataS1.pdfPDF document, 211.3 KB Data S1. Preprocessing, illustration and analysis R code. REFERENCES 1, , , , , , et al. Retirement risk factors, exercise management, and muscle mass in US senior horses. Equine Vet J. 2024; 56(3): 522–534. https://doi.org/10.1111/evj.13958 2, .