respiratory quotient (rq)/ respiratory exchange ratio (rer) rq - the ratio of the amount of carbon...
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Respiratory Quotient (RQ)/Respiratory Quotient (RQ)/Respiratory Exchange Ratio (RER)Respiratory Exchange Ratio (RER)
RQRQ - The ratio of the amount of - The ratio of the amount of carbon dioxide produced divided by carbon dioxide produced divided by the amount of oxygen consumed at the amount of oxygen consumed at the cellular levelthe cellular level
RERRER - The ratio of the volume of - The ratio of the volume of carbon dioxide produced divided by carbon dioxide produced divided by the volume of oxygen consumed on a the volume of oxygen consumed on a total body leveltotal body level
RQ = VCORQ = VCO22/VO/VO22
Aerobic Exercise ResponseAerobic Exercise Response
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RER
• CHO (per molecule of glucose)
• 6 O2 + C6H12O6 = 6 CO2 + 6 H2O + 36 – 38 ATP
• RER = 6 CO2/6 O2 = 1.0
RER
• FAT (molecule of palmitic acid)
• C16H32O2 + 23 O2 = 16 CO2 + 16 H20 +129 ATP
• RER = 16 CO2/23 O2 = .70
RER
• The RER at rest is ~ .78 - .80.
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Table 5.4
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Table 5.5
Caloric EquivalentCaloric Equivalent - The number of - The number of kilocalories produced per liter of kilocalories produced per liter of oxygen consumedoxygen consumed
Caloric CostCaloric Cost - Energy expenditure - Energy expenditure of an activity performed for a specific of an activity performed for a specific period of timeperiod of time
Aerobic Exercise ResponseAerobic Exercise Response
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Caloric cost (kcal/min)Caloric cost (kcal/min) = =
OO22 consumed (L/min) x caloric consumed (L/min) x caloric equivalent (kcal/LOequivalent (kcal/LO22))
Given:Given:
RER = .91RER = .91
OO22 cons = 2.15 L/min cons = 2.15 L/min
Calculate caloric cost for 30 min Calculate caloric cost for 30 min of exerciseof exercise
Aerobic Exercise ResponseAerobic Exercise Response
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The caloric equivalent for an RERThe caloric equivalent for an RERof .91 isof .91 is
4.936 kcal/LO4.936 kcal/LO2 2 (see table 5.4)(see table 5.4)
2.15 O2.15 O22/min x 4.936 kcal/LO/min x 4.936 kcal/LO22 = =
10.61 kcal/min10.61 kcal/min
10.61 kcal/min x 30 min = 318.3 kcal10.61 kcal/min x 30 min = 318.3 kcal
Aerobic Exercise ResponseAerobic Exercise Response
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The Metabolic Equivalent (MET)The Metabolic Equivalent (MET)
METMET - A unit that represents the - A unit that represents the metabolic equivalent in multiples of metabolic equivalent in multiples of resting rate oxygen consumptionresting rate oxygen consumptionof any given activityof any given activity
MET = OMET = O22consumed/3.5consumed/3.5
Aerobic Exercise ResponseAerobic Exercise Response
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