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The Journal of Sports Medicine and Physical Fitness 2019 November;59(11):1828-34

DOI: 10.23736/S0022-4707.19.09463-5


language: English

Assessment of muscle fiber adaptation in footballers using a new ELISA assay of myosin isoforms

Mario GUERRERO 1, Gerard CARMONA 2, Gil RODAS 3, Joan A. CADEFAU 1, 2, Antonio MAESTRO 4, Roser CUSSÓ 1, 5

1 Department of Biomedecine, Faculty of Medicine, University of Barcelona, Barcelona, Spain; 2 INEF of Catalunya, Barcelona, Spain; 3 Futbol Club Barcelona, Barcelona, Spain; 4 Real Sporting Club Gijón, Gijón, Spain; 5 Institut d’Investigacions Biomèdiques (IDIBAPS), University of Barcelona, Barcelona, Spain

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.

KEY WORDS: Myosins; Football; Enzyme-Linked Immunosorbent Assay

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