High Intensity (anaerobic) Exercise 1 Flashcards
What colour does type IIb/IIX fibres appear under staining?
White
What colour does type IIa fibres appear under staining?
Grey
What colour does type I fibres appear under staining?
Black
When is activity anaerobic?
When oxygen is not needed for metabolism
What is the level of PC in the human body?
18kJ (4kCal)
How long does the ATP-PC system last?
Less than 10s
Give some characteristics of slow twitch (type I) fibres
- Favours aerobic metabolism.
- Low fatiguability
- Slower Ca2+ pumping
- Small fibre size
- Recruited at all intensities
Give some characteristics of fast twitch (type IIA and IIB/X) fibres
- Favours anaerobic metabolism
- Highly fatiguable
- Faster Ca2+ pumping
- Larger fibre size
- Only high intensities
What does the formation of H+ lead to?
Fatigue
Why does anaerobic work lead to fatigue?
- Decreased PC (ATP-PC)
- Increased H+ (An. Glycolysis)
- Increased Pi (both)
What is the substrate for the ATP-PC system?
PC. Increased PC stores may help high intensity performance
What is the substrate for An. Glycolysis?
CHOs.
What enzyme catalyses reaction in ATP-PC system?
Creatine Kinase
What stimulates PC?
ADP
Explain end-product inhibition
Because CK acts on ADP + CP, their relative absence inhibits further activity
