Fysiologi b2 eksamensspørgsmål Flashcards

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4 neurale

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Nervesystemet kan justere på:
1: Fyringsfrekvensen (og dermed muskelfibrens kraftudvikling)
Ved et twitch er der en lang latensperiode før kraftudvikling, primært grundet at elastiske komponenter skal strækkes ud (titin, bindevæv, sener) denne forsvinder næsten ved forøgelse af fyringsfrekvens (takket tetanus), da de elatiske komponenter er strukket ud
Kraftudviklingen er langsommere end calcium frigivelsen
2: Rekruttering (antallet af aktive motoriske enheder, og dermed antallet af aktive muskelfibre)

Kraften afhænger også af den relative længde af de arbejdende fibre “isometrisk længde-spændingsforhold”
Derudover:
Kraft-hastigheds-sammenhængen

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Kraftudviklingsraten er langsommere end calcium frigivelsesraten
Latensperiode væk da de elatiske ligamenter er udstrakt

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B: ATP-mangel som forhindrer brydning af tværbroer

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Hvad bruges energien i muskelfibren til?

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Som minimum, hvis der kun anvendes fedt til energi, kan man max arbejde på 50-60% af VO2max. Snak ud for dette

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“stort set alle de negative adaptioner kan i høj grad bremses af træning og aktivitet, minus “døde” alpha motorneuroner”

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