Exercise Metabolism

Question 1

When first beginning ex’s ATP need is met by:

Answer 1

ATP-PC System, then anaerobic glycolysis

Question 2

Oxygen Deficit

Answer 2

-difference between O2 uptake in first few minutes of ex’s and an equal time period after steady state has been reached

Question 3

Which System Provides Energy at Rest?

Answer 3

-Aerobic Glycolysis

Question 4

As steady state is approached:

Answer 4

the need for ATP is met through decr use of anaerobic glycolysis and an increase use of aerobic metabolism

Question 5

Once steady state is reached:

Answer 5

ATP supply met via Aerobic metabolism

Question 6

O2 deficit is _____ for trained people versus untrained

Answer 6

lower

Question 7

2 Phases of EPOC

Answer 7

• rapid recovery

- Slow recovery

Question 8

Rapid Recovery

Answer 8

O2 used mostly to replenish ATP-PC and O2 stores in muscle and blood

Question 9

EPOC

Answer 9

• excess post-exercise O2 consumption

- increased metab (ventilation) after exercise stops

Question 10

Glycogen Resynthesis Depends on

Answer 10

• type of ex’s that caused glycogen depletion
• amount of CHO consumed during recovery

(diet 55-60% carbs, recovery in 24 hours)

Question 11

Glycogen resynthesis can take:

Answer 11

several days

Question 12

Restoration of ATP-PT System

Answer 12

• rapid recovery phase
• energy comes from break down of CHO and fats to CO2 and H2O via krebs cycle

-some ATP used to replenish PC stores, some stored immediately

Question 13

Glycogen Resynthesis:

Low intensity, long duration ex’s

Answer 13

eat more CHO during recovery to restore glycogen

Question 14

Glycogen Resynthesis:

high intensity, short duration ex’s

Answer 14

• complete resynthesis does not require greater than normal intake of CHO
• recovery in 24 hours regardless of diet
• resynth most rapid in first few hours

Question 15

Major removal of lactate:

Answer 15

-oxidated/converted to CO2 and H2O

Question 16

Untrained people may have prolonged:

Answer 16

anaerobic metabolism

Question 17

Slow recovery

Answer 17

• convert lactic acid to glucose
• supply ATP to heart and ventilatory Mm
• response to elevated body temp
• response to circulating Epi/NE

Question 18

4 Methods of Lactate Removal

Answer 18

• excreted in sweat/urine
• converted to protein
• cori cycle (to liver)
• oxidated/converted to CO2 & H2O (major method)

Question 19

Speed of Lactate Removal

Answer 19

• depends on removal method
• best while doing light continuous exercise during recovery
• 30-45% VO2 max during recovery

Question 20

Cori Shuttle

Answer 20

• lactate shuttle between muscles and liver

- converted to glucose and released in blood or stored