Lecture 13b - EPOC and O2 Deficit (Anaerobic Cont'd)

Question 1

what is EPOC

Answer 1

excessive post-exercise oxygen consumption
- we don’t immediately go back down to baseline level as we have to replenish our energy stores

Question 2

O2 deficit

Answer 2

when O2 demand is greater than O2 consumed in early exercise
- body incurs O2 deficit
- O2 required - O2 consumed
- occurs when anaerobic pathways used for ATP production
- O2 deficit get smaller the more aerobically fit you become

Question 3

EPOC with moderate vs heavy exhausting exercise

Answer 3

• see 5m30s on lecture 13 vid
• basically aerobic system can solely take on the heavy demands then the PCr system/anaerobic system will kick in and help (O2 requirement is synonymous with ATP deficit)

Question 4

why doesn’t oxygen uptake immediately return to baseline

Answer 4

remains elevated above rest into recovery
- oxygen dept repayment

Question 5

explain the “rapid” portion of EPOC

Answer 5

• resynthesize of stored PC
• replenish muscle and blood O2 stores

Question 6

explain the “slow” portion of EPOC

Answer 6

conversion of lactic acid to glucose (gluconeogenesis)
- elevated HR and breathing = increased energy needed
- elevated body temp = increased metabolic rate
- elevated epinephrine and norepi = increased metabolic rate

Question 7

why is EPOC greater following higher intensiy exercise

Answer 7

• higher body temp
• greater depletion of PC (additional O2 required for resynthesis)
• greater blood concentration of lactic acid (greater level of gluconeogenesis)
• higher levels of blood epi/norepi