fisio lez 5 tessuto muscolare
TRANSCRIPT
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BIOCHIMICA DEL
TESSUTO MUSCOLARE
a. La contrazione muscolare
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CARATTERISTICHE DELLE
CELLULE MUSCOLARI
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b)
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http://www.sci.sdsu.edu/movies/actin_myosin_gif.html
https://www.youtube.com/watch?v=7wM5_aUn2qs
https://www.youtube.com/watch?v=HJj3jUVDFFo
https://www.youtube.com/watch?v=Ki6WjplSUcE
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BIOCHIMICA DEL
TESSUTO MUSCOLARE:
b.Le FIBRE MUSCOLARI
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Fibre IIC rare e indifferenziate rilevabili
durate il processo di remodelling muscolare
LENTE INTERMEDIE RAPIDE
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FIBRE
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TIPO FIBRE
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Allenamenti per la resistenza stimolano la trasformazione di fibre
muscolari, che per esempio convertono fibre IIA (intermedie) in
fibre I (lente) . In questo modo i muscoli saranno più predisposti a
prestazioni di lunga durata aumentando la loro capacità di
resistenza.
Invece la conversione di fibre I in fibre IIB (veloci) innescate
dall’esercizio fisico è possibile solo in quantità limitate
FIBRE I FIBRE II
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• Praticamente tutti i velocisti olimpionici
possiedono l’allele 577R, una variante
del gene ACTN3 (codifica per l’α-
actinina3) che aumenta la potenza
muscolare. Circa la metà degli
Euroasiatici e l’85 per cento degli
Africani possiede questo fortunato
allele, il resto può mettere da parte
qualsiasi aspirazione olimpionica…….