Serum levels of total creatine kinase (CK), CK-MM and the isoform of CD-MM were measured in 14 male competitive collegiate swimmers. The purpose of this study was to observe changes in CK and the isoforms of CK-MM following a competitive swim training session. Venous blood samples were taken before and immediately following a 5550 yard training session. The main series in the workout consisted of a 27 minute, minimal rest interval set designed to obtain a moderately heavy physical effort. Total CK, composed predominantly of CK-MM, increased significantly (p
Bean, M.H., H.M. Neisler, W.R. Thompson, M. Hall, T. Young, and J. Pittington: Creatine kinase, creatine kinase‑MM, and the isoforms of creatine kinase‑MM following a competitive swimming workout, JOURNAL OF SWIMMING RESEARCH, 7(3):1991, 21-25. http://www.swimmingcoach.org/pdf/pub/jsr1990c.pdf.