week 9 lab v02 max Flashcards

1
Q

what does the Vo2 max measure

A

the power of the oxygen transport system

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2
Q

what is generally used for the v02 test

A

cycle ergometer

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3
Q

best results are obtained from tests that are how many minutes?

A

9-15

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4
Q

how is the measurement of VO2 max determined? what is the general procedure

A

measurement of the subjects exhastive response from max work where work rate is increased in incremental steps

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5
Q

4 uses for v02 max measurements

A
  1. to indicate individuals with high endurance abilities
  2. to evaluate the effects of training on endurance
  3. measure the metabolic costs of various work tasks under normal or non normal conditions
  4. detect impaired cardiorespiratory function or metabolic diseases
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6
Q

What are the 6 Methodolical Criteria for administering a maximum oxygen uptake test

A
  1. work should involve large muscle groups
  2. continuous work with gradual increasing intensities
  3. work intensity must be selected so subject will be exhausted in 7-10 min after warmup
  4. work rate should be heavily so oxygen uptake is not entirely correspond with energy requirement of work load
  5. the work rate must be measurable and reproducible
  6. test conditions must allow results to be comparable and repeatable
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7
Q

what is the Criteria for REACHING v02 max (5)

A
  1. oxygen consumption hits a plateau and last 2 values agree with +-125ml
  2. blood lactate levels 8.0mM/liter after 3-5 minutes since stoping exercise
  3. heart rate should be close to age predicted max
  4. respiratory exchange ratio must be greater than 1.15
  5. subject must be exhuasted
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8
Q

what is the manual system for measuring oxygen uptake V02 max

A
  • exhaled gas collected in balloons
  • after co2 and o2 levels in ballons is determined by analyzing a small sample
    content of ballons is squeezed through a ventilation meter
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9
Q

what is the automated measuring system of max oxygen uptake

A
  • gas directed through a pneumotachograph or turbine device that measures air flow rate
  • sends an analog voltage signal to computer system
  • mixing box analyses samples of gas
  • computer takes info and calculates the oxygen upatake during excersise
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10
Q

automated measuring methods considerble improved the ______________ compared to manual tests

A

time expenditure for tests

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11
Q

what should subject do before test

A
  • provide any excersise they did
  • well rested and no drugs, cigarettes or alcohol 2-4hrs before test
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12
Q

steps to prep subject

A
  1. calibrate machines
  2. get body mass
  3. barometric pressure
  4. heart rate meter on subject before warm up and measure heart rate in last 5 seconds of each min
  5. ensure respirtory value and mouthpiece are fit and no leaks and proper direction of exhaled air
  6. nose clip
  7. tissues
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13
Q

whats type of excersise test is this and why

A

a continuous excersise test where there is no rest between increments

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14
Q

what should the pedaling frequency be

A

80rpm or higher

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15
Q

what is the warm up period

A

the first 6 minutes

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16
Q

stop the excerise when

A
  1. subject is unable or doesn’t want to continue
  2. evidence of phsyiological problems
  3. signs of impeding emergency situation (pale skil, blue lips, shakiness)
17
Q

how should subject recover

A

cool down on bike until they feel recovered, do not leave subject alone

18
Q

how is the expired gas analyzed

A
  • expired air chanelled through hose,
  • gas collected in baloons for the second minute at each work rate until exhaustion
  • analyze co2 and 02 in balloons
  • determine minute ventilation
19
Q

how do we determine the minute ventilation

A

by squeezing contents of the balloon through the ventilation meter

20
Q

what is boyle’s law

A

if the temperature remains constant there is an inverse relationship between pressure and volume of VO2 upatke

21
Q

what is charles law

A

is pressure is held constant there is a direct relationship between the temperature and volume

22
Q

what are all volumes corrected to

A

STPD - standard temperature, pressure dry (no water vapour)

23
Q

amount of oxygen consumed =

A

the amount of oxygen inhaled minus the amount of oxygen exhaled

24
Q

what is assumed about nitrogen gas in inhalation/exhale

A

the volume of nitrogen inhaled equals the volume exhaled

25
Q

a change in nitrogen is due to

A

change in the volume of the gas mixture

26
Q

the volume of gas is dependent on

A

the number of molecules present, not the size of the molecules

27
Q

what does atmospheric air consist of

A

n2, o2 and co2

28
Q

when using the bicycle ergometer u have to multiply the subjects VO2 by

29
Q

what is Ve atp

A

minute ventilation of expired air

30
Q

what is Tgas

A

tempature in degrees celcius of gas passing through ventilation meter