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Assessment of muscle fiber adaptation in footballers using a new ELISA assay of myosin isoforms
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BACKGROUND: To measure the impact of training models on injury incidence, data of health and performance were integrated to study fiber adaptation during a competitive season. We studied football players over a season, analyzing hours of exposure to sport by serum changes in fast and slow myosin, creatine kinase and lactate dehydrogenase. METHODS: A new assay was developed to measure the myosin isoforms in 49 non-sporting volunteers and in 27 professional football players. RESULTS: Myosin isoforms in volunteers with mean ages of 30±8 were 1553 µg/L fast and 1284 µg/L slow; in the group with of 56±7 were 1426 µg/L fast and 1046 µg/L slow. Slow myosin was significantly lower in older subjects (-18%). Samples from the players in preseason had lower mean scores for fast myosin (1123 µg/L) and higher for slow myosin (2072 µg/L) than reference volunteers. During the season, myosins reached the maximum with the maximum load (1537 µg/L fast, 2195 µg/L slow but decreased and adapted to the high level of demand (425 µg/L fast, 1342 µg/L slow). CK and LDH were maximal at the pre-season (227 U/L, 333 U/L) while myosin levels were maximal at the beginning of season (1537 µg/L, 2195 µg/L). CONCLUSIONS: Measuring serum myosin isoforms we identify the type and amount of damage caused by training and matches, making it a new control tool capable of advising training towards a minimum of blood slow myosin but controlling the fast fiber participating and be able to improve the performance of the players.
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GUERRERO, Mario, CARMONA DALMASES, Gerard, RODAS FONT, Gil, CADEFAU SURROCA, Joan aureli, MAESTRO, Antonio, CUSSÓ FRESQUET, M. roser. Assessment of muscle fiber adaptation in footballers using a new ELISA assay of myosin isoforms. _Journal of Sports Medicine and Physical Fitness_. 2019. Vol. 59, núm. 11, pàgs. 1828-1834. [consulta: 25 de febrer de 2026]. ISSN: 0022-4707. [Disponible a: https://hdl.handle.net/2445/150013]