Lecture 2 (PE 32).docx

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23 Oct 2013
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Lecture 2: Cardiorespiratory Endurance (stamina)
Benefits:
Reduced risk of chronic disease
Better control of body fat
Improved immune function
Improved psychological well-being
Improved cardio-respiratory functioning
Improved cellular metabolism
Cardiorespiratory Endurance
Defined as the ability of the body to perform prolonged, large muscle, dynamic exercise
at moderate to high levels of intensity
o Take in (lungs)
o Deliver (heart)
o Use (muscle cells)
OXYGEN
Energy Production
The body converts chemical energy from food into substances the cells can use as fuel
ATP (adenosine triphosphate) basic form of energy used by cells
o Converts food substances that cells use as fuel
Metabolic Processes
Food 1,2 Fuel
o In the absence of Oxygen
1. Immediate Stores (ATP, CP)
2. Anaerobic or nonoxidative metabolism
Food 3 Fuel
o In the presence of Oxygen
3. Aerobic or oxidative metabolism
Characteristics of the Body’s energy systems
Anaerobic Metabolism
Duration of Activity for which system
predominates
10 secs 2 mins
Intensity of activity for which system
predominates
High
Rate of ATP production
Rapid
Fuel
Muscle stores of glycogen/glucose
Oxygen used?
None
Sample activities
400m run, running up stairs
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