Brainscape's Knowledge GenomeTM

Browse over 1 million classes created by top students, professors, publishers, and experts.


See full index

259 - physiology > lab 2: vo2 max measuremnets > Flashcards

lab 2: vo2 max measuremnets Flashcards

1
Q

why is using open circuit spirometry popular

A

non-invasive method that allows researchers and clinicians to measure and understand many important mechanisms within the cardio-pulmonary systems, as well as the body’s metabolism during exercise.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
2
Q

what are some examples of values obtained thru open circuit spirometry

A

breath-by-breath measures of oxygen consumption (VO2), carbon dioxide production (VCO2), and minute ventilation (VE).

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
3
Q

are breath-by-breath measures of oxygen consumption (VO2), carbon dioxide production (VCO2), and minute ventilation (VE) directly measured from open circuit spirometry?

A

no its obtained by using raw data
The values obtained from the system are: inspired O2 and CO2 fractions (FIO2 and FICO2; %), expired O2 and CO2 fractions (FEO2 and FECO2; %), and minute ventilation (VE; L/min).

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
4
Q

what is the goal in obtaining data like inspired O2 and CO2 fractions (FIO2 and
FICO2; %), expired O2 and CO2 fractions (FEO2 and FECO2; %), and minute ventilation (VE; L/min).

A

The goal in obtaining this data is to determine the very popular VO2max (or VO2peak) wherein a subject is asked to exercise until his/her oxygen consumption reaches a plateau or peak

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
5
Q

what is vo2

A

subject is asked to exercise until his/her oxygen consumption reaches a plateau or peak

preferred method for establishing an individual’s aerobic capacity and assesses an individual’s ability to use the aerobic energy system.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
6
Q

what are some of the reasons you might use the results of VO2 max test

A

a coach might use the results from the VO2max test to develop a specific training program for an athlete,

use pre- and post-training VO2max test values to determine the effectiveness of aerobic training protocols on his/her athletes.

cardiologist may want to screen a patient post-surgery to ensure that they are ready to take part in a rehabilitation program.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
7
Q

what are 2 varibales of interest from the vo2 max test used alot for determining ones aerobic fitness levels

A

vo2 max/v02 peak

ventilatory threshold value

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
8
Q

what is the v02max/vo2 peak value

A

simply the maximum or peak amount of oxygen an individual’s body can
use per minute (L/min). It is typically expressed relative to the individual’s body weight, in ml/kg/min.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
9
Q

what is the ventilatory threshold

A

The ventilatory threshold is the point in a VO2max test where pulmonary ventilation (VE) increases disproportionately relative to increases in oxygen consumption (i.e., marked increase in the VE/VO2 ratio)

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
10
Q

what is the point called at which the pulm ventilation is no longer directly associated to the bodys oxygen requirements

A

veentilatory threshold

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
11
Q

why do we reach ventilatory thresehold

A

This is thought to be caused by the CO2 released in the buffering of lactate. With increased intensity of exercise, there is an imbalance between lactate production and clearance. The excess lactate is buffered, with one of the by-products being CO2

The excess CO2 stimulates ventilation, therefore
increasing VE/VO2. It should also be noted that the VCO2/VO2 increases disproportionately at this point

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
12
Q

what are some different ways to express VT

A

1) VO2 at VT as a % of the individual’s VO2max
i. e., VO2 at VT / VO2max * 100
2) As a heart rate (HR) when the VT occurred
3) As a speed, load, work rate or effort level when the VT occurred

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
13
Q

true or false: oonce you reach VT you can no logner exercise

A

false, you can continue to erxercise for an extended period of time but will quickly lead to exhaustion

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
14
Q

If the VO2max is seen as an individual’s upper limit for

aerobic exercise, then the VT determines BLANK

A

how much of that limit can effectively be used for a significant
amount of time (i.e., aerobic efficiency).

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
15
Q

explain the vo2 max test

A

an 8-12 min graded exercise test used to assess aerobic fitness levels

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
16
Q

why is the vo2 max test not less than 8 minutes

A

values not properly attained/ dont reach a max

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
17
Q

why is v02 max not valid after 12 minutes

A

test is prematurely ended because of fatigue

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
18
Q

what does it mean for a test to be “graded”

A

intensity increases over time, incrementally

speed, workload, incline etc

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
19
Q

what are 4 factors that affect v02 max

A

age
sex
genetics
traininng

20
Q

explain how age affects vo2 max

A

vo2 maxc decrases 1% per year after 25 years old

21
Q

explain how sex affects vo2 max

A

females have lower vo2 max than men by 15-30 %

22
Q

explain how genettics affect vo2 max

A

40% of results for vo2 max are pre determined by genetics

23
Q

explain how training can affect vo2 max

A

vo2 max can increase by 5-20% if you aerobically train

24
Q

what are some control factors before a vo2 tes

A

no caffience, alcohol or meals 3 hours prior
no smoking 3 hours prior
rested and motivated for teset
external motivation

25
Q

what are the 5 vo2 max end criteria

A

1) RER greater or equal to 1.10
2) Max HR (220-age)
3) RPE greater or equal 17
4) subject wants to stop

5) vo2 plateau is reached (looked at after test end)
=VO2 MAX attended

26
Q

if someone reaches their max HR, is a v02 peak or max made

A

peak

27
Q

if someone reaches their max HR, or RER, is that a reason to stop the tes

A

no , main goal is to reach the PLATEAU

28
Q

what is the values to know if you reached plateau (vo2 max)

A

change in vo2 across the last load/stage change less than or equal to 2 ml/kg/min

29
Q

why can you use VT and VCo2 interchangebly

A

because VE will increaese proportionally to increase in VCO2 (beforee VT)

30
Q

before VT what type of sources of energy are we workign

A

aerobic

31
Q

after VT, what is the mai ntype of energy

A

anerboic and aerobic sources

32
Q

why will VE and VCO2 no t be propriontal afteer VT

A

lactate buffering

33
Q

what are the 2 most important variables attained from VT and V slope graph

A

1) VO2 at VT (reportted as percentage of vo2 max)

2) HR at VT

34
Q

what does VO2 at VT (reportted as percentage of vo2 max) value indicate

A

indicates effiencey of aerobic system

35
Q

what does HR at VT value indiciate

A

indicates sustainble HR

36
Q

in untrained individuals, what is a normal value of vo2 at vt ration

A

between 45-65 percent

37
Q

in trained individuals, what is a normal value of vo2 at vt ration

A

clsoer to 85%

38
Q

why is interval training at HR above HR at VT

A

because you can train the system to push the VT to the right (delay the onset of lactate accumulation)
=increse performance
=increase aerboic efficiency

39
Q

when do we use RQ

A

only valid during steady stage (aerobic only)

=indicates nutrient mixture catabolized for energy
(0.7 pure fat
1=pure carbs)

40
Q

what is RER ration

A

gas exchange values alterd by other factors (ex: exercise)

=measure of subjects effort

41
Q

what is the formula for oxygen consumption

A

see notes for details BUT

VO2 = (VI x FIO2) - (VE x FEO2)

42
Q

what are all values in the date calibratiof got

A

STPD

standard temp pressure dry

43
Q

what formula is used to determine volume of air inhaled

A

haldene transformationn

44
Q

what is the formula for haldene transportation

A

VI = VE x (FEN2/FIN2)

see notes

45
Q

in order to calcuate fraction of nitrogen inn exhaled/inhaled air, what must you do

A

compare it to FIO2 from data

ex:

FIN2 = 100 % - ( FIO2+FICO2)

46
Q

what is the formula for RER

A

RER = vc02 (l.min)/vo2

47
Q

what is the formula for VCO2

A

see notes

VCO2 = VE x (FECO2-FICO2)

259 - physiology (21 decks)

Brainscape helps you reach your goals faster, through stronger study habits.
© 2024 Bold Learning Solutions. Terms and Conditions