Lab 2 - intro to VO2max measurements Flashcards
one of the most widely used measurement methods in the field of exercise physiology
open-circuit spirometry
the values obtained by open-circuit spirometry include (3)
oxygen consumption (VO2) carbon dioxide production (VCO2) minute ventilation (Ve)
goal of open-circuit spirometry
obtaining a VO2 max value
this is the prefered method for establishing an individual’s ____ and assesses an individual’s ____
aerobic capacity, ability to use the aerobic energy system
2 variables are of particular interest when assessing one’s aerobic fitness levels, name them
VO2max/VO2peak value and ventilatory threshold value
What is the VO2max/VO2peak value?
maximum or peak amount of oxygen an individual’s body can use per minute
units of VO2max/VO2peak (2)
L/min and mL/kg/min when using the subject’s body weight
What is the ventilatory threshold
the point in a VO2max test where pulmonary ventilation (Ve) increases disproportionately relative to increases in oxygen consumption
ventilatory threshold is thought to be cause by what
Co2 release in the buffering of lactate
t/f the excess CO2 from lactate surproduction stimulates ventilation, thus increasing the Ve/Vo2 ratio
true
If the VO2max is seen as an individual’s upper limit for aerobic exercise, then the VT determines what
how much of that limit can effectively be used for a significant amount of time (aerobic efficiency)
This information (Vo2 max and VT) can be used to adapt a training regimen in the hope of what
increasing the proportion of the VO2max that can be effectively used
what is Vi
volume of inhaled air (L/min)
what is FiO2
fraction of oxygen in inhaled air
what is FeO2
fraction of oxygen in exhaled air
what is Ve
volume of exhaled air (L/min)
all values in the datasheet are calibrated for STPD, what is that
Standard Temperature-Pressure-Dry
What is the haldane tranformation used to
to determine the volume of air one inhales
what is FeN2
fraction of nitrogen in exhaled air
what is FiN2
fraction of nitrogen in inhaled air
When determining FiN2 (%N2), sum the values of __ and ___ and then subtract that value from 1.00 (100%)
FiO2 (%O2) + FiCO2 (%CO2)
the RER provides what
an estimate of a subject’s effort (indicator if that person is at nearing exhaustion)
what causes the RER to increase over 1.10
hyperventilation
what is RQ
respiration quotient
what does RQ provides
approximating the nutrient mixture catabolized for energy during rest and/or steady-state aerobic physical activity
t/f RER and RQ is the same thing
false, same formula but not same meaning
When CHO is being catabolized, the amount of CO2 produced ___ the amount of O2 used
equals
When fat is being catabolized, the amount of CO2 produced ___ the amount of O2 used
is less than
pure CHO utilization = RQ of ___
1.00
pure fat utilization = RQ of ___
about 0.70
VO2 plateau is attained if
VO2/kg before the last load change is less than 2mL/kg/min of the value after the last load change
