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Exercise Metabolism Basics
Transcript of Exercise Metabolism Basics
excess post-exercise oxygen consumption
( %VO max)
VO max test
ENERGY REQUIREMENT of EXERCISE
TOTAL ENERGY SUPPLY
Aerobic energy supply
energy required at rest
Short-term, intense exercise
lag in oxygen uptake at the beginning of exercise, aka "on-kinetics"
anaerobic energy is required to make up for this
*note: this drawing is not exact, just an illustration
often divided into:
2-3 min post-ex
> 30 min post-ex
restoration of PCr and oxygen stores
increased HR and breathing
increased body temperature
energy comes from ATP-PC system or glycolysis
depends on the length of the activity
though all 3 are active
50/50 glycolysis and aerobic
when going "all out"
high relative work rate
steady-state of oxygen consumption can normally be maintained, unless...
primarily due to rising body temperature, hormones, and VO "slow component"
at low intensities (e.g. 30% VO max), fats are the primary fuel source
at higher intensities (e.g. 70% VO max), carbohydrates are the primary fuel source
increased rate of glycolysis
more epinephrine, which stimulates glycogen breakdown
prolonged exercise results in a shift toward a greater use of fats
results in increased activity
breaks down triglycerides into free fatty acids
reduces insulin, which usually inhibits lipolysis
more lactate produced, inhibiting fat breakdown
glycogen stores become a problem during exercise longer than 1-2 hours
results in fatigue
reduction in Krebs cycle intermediates
reduction in fat metabolism
"fats burn in the flame of carbohydrates"
lactate can be removed from the blood by "slow-twitch," highly-aerobic fibers
lactate can also be converted to glucose in the liver
onset of blood lactate accumulation
The intensity at which blood lactate levels reach
formerly the "anaerobic threshold"
rate of glycolysis continues to increase at increasing intensities
increased recruitment of "fast" fibers with isozyme with greater pyruvate lactate affinity
increased lactate and decreased lactate
good predictor of aerobic performance ability
useful for exercise prescription
(only about 20% of the lactate is removed this way)
increased glucose uptake in muscle
decreased fat translocation
if beta-oxidation is able to meet ATP demands, it will inhibit rate-limiting steps of glycolysis