EPOC Flashcards

1
Q

What happens after exercise

A
  • Body in state of fatigue
  • Myoglobin has depleted O2 stores
  • ATP,PC and glycogen stores are depleted
  • High levels of lactic acid
  • Feelings of exhaustion
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2
Q

What is the work:relief + O2 supply

A

Breakdown and removal of lactic acid

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3
Q

What is the aim of the recovery process

A

Primary aim is to return the body to a pre exercise state where:
- Myoglobin is saturated
- Fuel stores fully restored
- Blood and muscle fibres of by-products

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4
Q

What is EPOC

A

Excess post oxygen consumption(oxygen debt)
- The required volume of oxygen required post exercise to return the body to it’s pre-exercise state

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5
Q

What happens during the fast alactacid component of recovery

A
  • First stage of recovery
  • Accounts for 10% of EPOC(1-4 litres of O2)
  • Replenishment of blood and muscle oxygen
  • Resynthesis of ATP and PC stores
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6
Q

What happens during the replenishment of blood and muscle oxygen

A
  • During exercise O2 is dissociated from the haemoglobin and myoglobin
    *Within the first minute of EPOC,O2 resaturates in the bloodstream
    *Within 3 minutes oxy-myoglobin links are restored
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7
Q

What happens during the resynthesis of ATP and PC stores

A
  • ATP and PC stores are depleted
  • Within the first 3 minutes,aerobic energy production continues,providing energy for ATP and resynthesis
  • 30 seconds to restore 50%
  • 3 minutes for full restoration
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8
Q

What happens during the slow lactacid component of recovery

A
  • Second stage of recovery
  • Approx 5-8 litres of O2 is required to complete the more complex and time-consuming return to pre exercise state
    *Provision of the energy to maintain ventilation,circulation and body temp
    *Removal of lactic acid and replenishment of glycogen
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9
Q

What happens during ventilation and circulation

A
  • During exercise respiratory rate,depth and heart rate increases
  • The energy cost of continued aerobic energy production is 1-2% of EPOC
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10
Q

Body temp in slow lactacid

A
  • For every 1 degree celc rise in body temp,metabollic rate increases by 13-15%
  • Post exercise the elevated temp remains,potentially for several hours post vigorous exercise
  • Accounts for as much as 60-70% of slow lactacid component of EPOC
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11
Q

What happens during the removal of lactic acid and replenishment of glycogen

A
  • Post exercise,LA is readily converted back to pyruvic acid and is either oxidised or converted into glycogen
  • Approx 50-75% of PA is oxidised into the mitochondria
  • Approx 10-25% of PA is reconverted into glucose
  • Small amounts of pyruvic acid are also converted into protein by the cori cycle in the liver and removed from the body in sweat and urine
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