ATP is the molecule that muscles use to create energy for movement
Anaerobic Alactic Phase 1
Anaerobic Lactic Phase 2
Aerobic Phase 3
All 3 energy phases work to produce ATP for energy for exercise but do it in different ways and produce different amounts of ATP

PC = Phospho Creatine
ADP = Adenosinediphosphate
Both molecules found in muscles in small amounts
PC + ADP => ATP + Creatine
One ATP molecule produced

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Glucose molecule stored in muscles as glycogen is shown as C6H12O6
Lactic Acid molecule is shown as
2C3H6O3
C6H12O6 + 2ADP + 2P => 2C3H6O3 + 2ATP
2 ATP molecules formed (twice as much as
Phase 1) but with Lactic acid waste

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Oxygen combines with Glucose to produce ATP without Lactic acid
Carbon Dioxide molecule is shown as
CO2. Given off as waste in this process.
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C6H12O6+6O2+36ADP+36P => 6CO2+36ATP+6H2O
36 ATP produced with water and carbon dioxide waste. Much more energy than phase 1 or 2

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Phase 1 is limited to about 10 – 15 seconds as it quickly uses up its store of PC molecules
Phase 2 is limited to about 3 minutes as lactic acid waste acts to inhibit muscle contraction. It takes the oxygen in phase 3 to break down lactic acid and restore muscle ability.
Phase 1 and 2 produce instant energy for explosive/quick movement.
Phase 3 is good for long duration exercise at moderate rates.
It uses oxygen to produce ATP molecules from glucose and
ADP. While it produces much more energy than phase 1 or 2 it is limited by the amount of oxygen getting to the muscles, if exercise exceeds the VO2 intake, energy must be created by phase 2 leading to lactic acid build up and muscle fatigue.

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Phase 1 produces 1 ATP molecule
Phase 2 produces 2 ATP molecules
Phase 3 produces 36 ATP molecules
Phase 3 aerobic energy produces vastly more energy than the first 2 energy systems. So long as there is enough oxygen and glucose stores one can continue to exercise

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2.
Find a definition for Maximum Volume Oxygen Uptake.
Explain how increases or decreases in Max VO2 impacts the body’s ability to produce ATP energy during aerobic exercise.
How is Lactic Acid a factor in the NHL when the puck is iced? If you don’t know the icing rule ask around and find out. Why do coaches sometimes use their time outs during this play?
Answers should be about one paragraph and well written.