Energy Systems
Name:
1. ATP-PC (Alactic) system
2. Lactic Acid system - anaerobic glycolysis & lactic acid production
3. Aerobic system - aerobic glycolysis, krebs cycle & ETC
ATP-PC System (Anaerobic)
ATP = energy currency of the body
ATP is a molecule that stores & releases chemical energy for use in body cells
ATP is formed when ADP binds with a P
When a cell needs energy it breaks the bond between ATP to form ADP (enzyme ATPase)
Resynthesis occurs when ADP combines with P = ATP
Lactic Acid System (Anaerobic)
Not sustainable over a long duration
Body breaks down CHO & converts it into glucose
Glucose is stored as glycogen in the liver & muscles when NOT used
Anaerobic glycolysis - Starts when ATP-PC fades. Without the presence of O2. breakdown
of glucose & glycogen releases energy which can be used to resynthesise ATP.
Breakdown of glucose produces 2ATP
Lactic acid - produced as a by-product. LA is a limiting factor in anaerobic glycolysis. LA
impredes muscle contraction & causes fatigue.
Aerobic energy system (aerobic)
O2 present
Yields 34 ATP
Produces CO2 & water
Occurs in mitochondria
Relies on breakdown of CHO & stored fats to produce energy
Glycolysis - first stage of aerobic metabolism (breakdown of foods & energy). Occurs in
sarcoplasm. Convert CHO into pyruvic acid using O2. Breakdown requires 10 chemical
reactions & produces 2 ATP
Krebs cycle - 2nd phase of anaerobic metabolism. Occurs in mitochondria & produces 2
ATP.
Electron Transport Chain - Occurs in mitochondria & produces 34 ATP from glucose.
Duration Classification Energy supplied by Sport example
1-3 seconds Anaerobic ATP (in muscles) Punch in boxing
3-10 seconds Anaerobic ATP + PC 100m sprint
10-45 seconds Anaerobic ATP + PC + muscle 200m sprint
glycogen
Name:
1. ATP-PC (Alactic) system
2. Lactic Acid system - anaerobic glycolysis & lactic acid production
3. Aerobic system - aerobic glycolysis, krebs cycle & ETC
ATP-PC System (Anaerobic)
ATP = energy currency of the body
ATP is a molecule that stores & releases chemical energy for use in body cells
ATP is formed when ADP binds with a P
When a cell needs energy it breaks the bond between ATP to form ADP (enzyme ATPase)
Resynthesis occurs when ADP combines with P = ATP
Lactic Acid System (Anaerobic)
Not sustainable over a long duration
Body breaks down CHO & converts it into glucose
Glucose is stored as glycogen in the liver & muscles when NOT used
Anaerobic glycolysis - Starts when ATP-PC fades. Without the presence of O2. breakdown
of glucose & glycogen releases energy which can be used to resynthesise ATP.
Breakdown of glucose produces 2ATP
Lactic acid - produced as a by-product. LA is a limiting factor in anaerobic glycolysis. LA
impredes muscle contraction & causes fatigue.
Aerobic energy system (aerobic)
O2 present
Yields 34 ATP
Produces CO2 & water
Occurs in mitochondria
Relies on breakdown of CHO & stored fats to produce energy
Glycolysis - first stage of aerobic metabolism (breakdown of foods & energy). Occurs in
sarcoplasm. Convert CHO into pyruvic acid using O2. Breakdown requires 10 chemical
reactions & produces 2 ATP
Krebs cycle - 2nd phase of anaerobic metabolism. Occurs in mitochondria & produces 2
ATP.
Electron Transport Chain - Occurs in mitochondria & produces 34 ATP from glucose.
Duration Classification Energy supplied by Sport example
1-3 seconds Anaerobic ATP (in muscles) Punch in boxing
3-10 seconds Anaerobic ATP + PC 100m sprint
10-45 seconds Anaerobic ATP + PC + muscle 200m sprint
glycogen
