High Intensity (anaerobic) Exercise 1 Flashcards Preview

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Flashcards in High Intensity (anaerobic) Exercise 1 Deck (18)
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1
Q

What colour does type IIb/IIX fibres appear under staining?

A

White

2
Q

What colour does type IIa fibres appear under staining?

A

Grey

3
Q

What colour does type I fibres appear under staining?

A

Black

4
Q

When is activity anaerobic?

A

When oxygen is not needed for metabolism

5
Q

What is the level of PC in the human body?

A

18kJ (4kCal)

6
Q

How long does the ATP-PC system last?

A

Less than 10s

7
Q

Give some characteristics of slow twitch (type I) fibres

A
  • Favours aerobic metabolism.
  • Low fatiguability
  • Slower Ca2+ pumping
  • Small fibre size
  • Recruited at all intensities
8
Q

Give some characteristics of fast twitch (type IIA and IIB/X) fibres

A
  • Favours anaerobic metabolism
  • Highly fatiguable
  • Faster Ca2+ pumping
  • Larger fibre size
  • Only high intensities
9
Q

What does the formation of H+ lead to?

A

Fatigue

10
Q

Why does anaerobic work lead to fatigue?

A
  • Decreased PC (ATP-PC)
  • Increased H+ (An. Glycolysis)
  • Increased Pi (both)
11
Q

What is the substrate for the ATP-PC system?

A

PC. Increased PC stores may help high intensity performance

12
Q

What is the substrate for An. Glycolysis?

A

CHOs.

13
Q

What enzyme catalyses reaction in ATP-PC system?

A

Creatine Kinase

14
Q

What stimulates PC?

A

ADP

15
Q

Explain end-product inhibition

A

Because CK acts on ADP + CP, their relative absence inhibits further activity

16
Q

What is PFK stimulated and inhibited by?

A

Stimulated by ADP

Inhibited by ATP, CP, low pH

17
Q

What is phosphorylase stimulated and inhibited by?

A

Stimulated by Ca2+

Inhibited by ATP

18
Q

Explain the hormonal response to high intensity activity

A

Increases in

  • adrenaline & noradrenaline - promote metabolism
  • Growth hormone - promote metabolism, other effects?