Midterm 2 Flashcards
During maximal exercise, as time increases, intensity _______ and demand for ATP______ (increases or decreases)
decreases, decreases
During the first minute of maximal exercise, which metabolism pathway is being used the most?
Anaerobic (no oxygen)
At 2 minutes of maximal exercise, what is the energy contribution?
50% aerobic, 50% anaerobic
During the first 10 seconds of maximal exercise, what is the % energy contribution? (anaerobic and aerobic)
85% anaerobic, 15% aerobic
When does the glycolytic pathway take over?
30 seconds of maximal exercise
Which anaerobic metabolic system trumps for the first 10 seconds of maximal exercise?
phosphagen system
Duration of maximal exercise & example event…
(Phos / Glyc / Oxid)
85/10/5
5 sec & 40 m dash
% energy contribution at 30 seconds at maximal exercise
Phos / Glyc / Oxid
30/50/20
% energy contribution during 1500m run
Phos / Glyc / Oxid
<1 /20/80
1 PCr yields how much ATP?
1 ATP
1 Lac yields how much ATP?
1.5 ATP
1 glycogen = 2 Lac + 3 ATP
What is the direct way to measure aerobic metabolism?
calorimetry (heat)
What is the indirect way to measure aerobic metabolism?
spirometry (air)
Open circuit or closed circuit?
Which one determines O2 consumption AND CO2 production?
Open circuit
“quantification of energy production by the body”?
calorimetry
Oxygen uptake of 1.0 L = ____ kcal ?
5 kcal
Respiratory exchange ratio (RER)
Ratio of CO2 produced to O2 consumed
VCO2/VO2
Is glucose or palmitate more O2 efficient?
Glucose
RER = 6/6 = 1
38 ATP/ 6 O2 = 6.3
% of CHO and fat when RER = 1.00
100% CHO, 0% Fat
% of CHO and fat when RER = 0.85
50% CHO, 50% Fat
What’s the RER when % CHO = 0 and % Fat = 100
0.70
Assumptions of RER
- no protein contribution
- steady-state conditions
Limitations of RER
- hyperventilation
- intense exercise
As CO2 increases, RER______
increases