Energy pathways during exercise

3 types of energy pathways during exercise

ATP-PC

Anaerobic glycolysis

Aerobic metabolism

ATP-PC pathway speed

immediate

Anaerobic glycolysis speed

short term

anaerobic metabolism speed

long term

are all pathways activated at the start of exercise

yes

do pathways act by themselves

no

which pathway dominates the first few seconds of exercise

ATP-PC

which pathway dominates the first few minutes of exercise

anaerobic glycolysis

which energy pathway ramps up and dominates after the first few minutes

aerobic

total energy (increases/decreases) after about 3 minutes

decreases

what happens to anaerobic glycolysis after 3 minutes

ramps down to near 0

ATP production during aerobic exercise: ATP-PC

first 10-30 seconds

ATP production during aerobic exercise: anaerobic glycolysis

-early in exercise

-at high intensity

ATP production during aerobic exercise: aerobic metabolism

dominant pathway after a few minutes

do pathways switch on and off

no

they overlap

high intensity aerobic exercise

-type 2 fibers are recruited (more glycolytic)

-there may be insufficient oxygen in some type 1 fibers

-anaerobic glycolysis supplements aerobic metabolism

aerobic exercise training (increases/decreases) the amount of oxygen that can be consumed

increases

how does aerobic training increases maximum oxygen consumption

-increase in VO2 max

-more mitochondria

-bigger mitochondria

-increased enzyme efficiency

-better blood flow

what does anaerobic training increase

the amount of energy that can be generated without oxygen

how does anaerobic exercise training increase anaerobic energy generation

-more PC

-increased enzyme efficiency

summary

-smooth transitions between dominant pathways

-no on/off switching

-anaerobic supplements aerobic

-aerobic training increases ability to use O2

-anaerobic training increases ability to produce ATP without O2