1. Aerobic Exercise Response5
Aerobic Exercise Response
Respiratory Quotient (RQ)/ Respiratory Exchange Ratio (RER)
RQ - The ratio of the amount of carbon dioxide produced divided by the amount of oxygen consumed at the cellular level
RER - The ratio of the volume of carbon dioxide produced divided by the volume of oxygen consumed on a total body level RQ = VCO2/VO2
Metabolic System Unit
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2. RER CHO (per molecule of glucose)
6 O2 + C6H12O6 = 6 CO2 + 6 H2O + 36 – 38 ATP
RER = 6 CO2/6 O2 = 1.0

3. RER FAT (molecule of palmitic acid)
C16H32O O2 = 16 CO H ATP
RER = 16 CO2/23 O2 = .70

4. RER
The RER at rest is ~

5. Table 5.4
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6. Table 5.5
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7. Aerobic Exercise Response5
Aerobic Exercise Response
Caloric Equivalent - The number of kilocalories produced per liter of oxygen consumed
Caloric Cost - Energy expenditure of an activity performed for a specific period of time
Metabolic System Unit
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8. Aerobic Exercise Response5
Aerobic Exercise Response
Caloric cost (kcal/min) =
O2 consumed (L/min) x caloric equivalent (kcal/LO2)
Given:
RER = .91
O2 cons = 2.15 L/min
Calculate caloric cost for 30 min of exercise
Metabolic System Unit
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9. Aerobic Exercise Response5
Aerobic Exercise Response
The caloric equivalent for an RER of .91 is
4.936 kcal/LO2 (see table 5.4)
2.15 O2/min x kcal/LO2 =
10.61 kcal/min
10.61 kcal/min x 30 min = kcal
Metabolic System Unit
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10. Aerobic Exercise Response5
Aerobic Exercise Response
The Metabolic Equivalent (MET)
MET - A unit that represents the metabolic equivalent in multiples of resting rate oxygen consumption of any given activity
MET = O2consumed/3.5
Metabolic System Unit
Copyright © Pearson Education, Inc. publishing as Benjamin Cummings