Intermittent Exercise

Question 1

What percentage of VO2 max does a footballer reach during a game?

Answer 1

75% VO2max

Question 2

What energy systems does a footballer use?

Answer 2

Aerobic- low intensity, long duration
Anaerobic via glycolysis- higher intensities, short duration

Question 3

What happens to the anaerobic system in 3 x30s max?

Answer 3

It declines

Question 4

What happens to PCr and B-oxidation in 3 x30s max?

Answer 4

They both increase

Question 5

What energy systems are used in the first and last 10 x 6s max?

Answer 5

1. 50% aerobic PCr/glycolysis
2. Very small anaerobic, PCr used instead of resynthesising

Question 6

Explain PCr resynthesise timings

Answer 6

25 mins for full storage
30s for 50% storage
Exponential recovery time course

Question 7

Explain what muscle types use more PCr in 2 x30s max?

Answer 7

1. Type 2 uses more PCr
2. Less PCr used in Type 2, maintained in type 1
   Only a small decrease of PCr in Type 1 may be due to a small store so easy to replenish
   OR
   Bout 2 needed less PCr because aerobic speeds up in 1 so high ATP for 2.

Question 8

What muscle fibre type can store the most PCr?

Answer 8

Type 1 has a bigger ATP store ad is relied on for short max but 4 mins too short rest

Question 9

Explain what happens to PCr during short term fatigue of type 2 muscle fibres

Answer 9

PCr remains as Cr and Pi

Question 10

What is muscle fatigue?

Answer 10

PCr splits and the Pi stops Ca being sucked into the SR

Question 11

What can cause muscle fatuige?

Answer 11

PCr depletion
Glycogen depletion (only at the end of a match)
Ca
Pi
H

Question 12

What are YoYo tests and what do they identify?

Answer 12

2x20m run, 10s rest
Max activation of aerobic
Ability to recover

Question 13

What are the benefits of HIIT?

Answer 13

Increases VO2 max
Decrease blood pressure