HPHE 6720 - Topic 1
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Transcript of HPHE 6720 - Topic 1
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Topic 1:
Maximal Oxygen Consumption
(VO2max) Testing
Laboratory Manual Section 02
HPHE 6720
Dr. Cheatham
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Goals for this Topic
Understand the physiological basis for VO2max
Understand the use of indirect calorimetry to
measure VO2
Become familiar with the protocols, equipment,testing procedures to measure VO2max
Become familiar with using the two different
metabolic measurement systems
Be able to collect, interpret, and analyze VO2max
data
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Physiological Basis
VO2 = CO (CaO2 CvO2)
VO2
= VA
(FI
O2
FE
O2
)
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Metabolic Computations VO2
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Metabolic Computations VO2
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Metabolic Computations VCO2
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Metabolic Computations RQ
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How is VO2maxExpressed?
Absolute VO2 The actual amount of oxygen your body utilizes
Usually in LO2/min or mLO2/min
Relative VO2 The amount of oxygen your body used per kilogram
of bodyweight mLO2/kg/min
Allows comparison between people of different
sizes.
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Absolute vs Relative VO2
VO2max = 5 LO2/min VO2max = 4 LO2/min
Body Mass = 230 lbs (104.5 kg) Body Mass = 150 lbs (68.2 kg)
VO2max = 47.8 mLO2/kg/min VO2max = 58.7 mLO2/kg/min
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Protocols to Assess VO2max
Mode of testing should be appropriate to the
individual being tested.
For athletes, should be sport specific.
Treadmill vs. Cycle Ergometer vs. Other
Incremental Stages
Continuous vs. Discontinuous
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Protocols to Assess VO2max
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General Protocol Guidelines: A beginning stage that is at a low intensity in order
to allow for an adequate warm-up.
A consistent and gradual increase in exerciseintensity.
An incremental increase in exercise intensity as to
allow for the test to finish in an appropriate amount
of time (8-15 minutes).
A protocol that is appropriate to the subject. I.e.
walking vs. running, appropriate treadmill speed (if
treadmill is used).
Protocols to Assess VO2max
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Treadmill Protocols
Established Protocols
Bruce, Modified Bruce
Balke, Naughton, Astrand (Not the Cycle Test)
Protocols to Assess VO2max
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Protocols to Assess VO2max
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A generalized treadmill protocol:
Example Treadmill Protocol
2 minute walking stage (3.0 mph, 0% grade)2 minute running stage (appropriate running speed, 0% grade)
1 minute stages keeping running speed constant and increasing grade 2.5 %
to 3%)
Note: If possible, it is advantageous to have the subject get on the treadmillbefore the actual test and to increase the treadmill speed until a
comfortable running speed is achieved.
Protocols to Assess VO2max
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Cycle Ergometer Protocols
Example Cycle Ergometer Protocol
2 minutes at 40 Watts (female) or 60 Watts (male)
1 minute stages in which the Watts are increased 20 Watts every minute
Protocols to Assess VO2max
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Equipment to Measure VO2max
Mode of Testing Treadmill
Cycle Ergometer
Mechanically braked cycle (Monark)
Magnetically/Electronically Braked
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Metabolic Measurement Cart
Allows for the measurement of Ventilation, O2 and
CO2 of expired air
Does calculations for you
Equipment to Measure VO2max
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Heart Rate Measurement Telemetry (Polar HR Monitor)
ECG (CM5)
Equipment to Measure VO2max
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Ratings of Perceived Exertion (RPE) Borg 6-20 Scale
Borg 0-10 Scale
Use standardized directions
During the exercise test we want you to pay close attention to how hard you
feel the exercise work rate is. This feeling should reflect your total amount of
exertion and fatigue, combining all sensations and feelings of physical stress,
effort, and fatigue. Dont concern yourself with any one factor such as leg
pain, shortness of breath, or exercise intensity, but try to concentrate on your
total, inner feeling of exertion. Try not to underestimate or overestimate your
feeling of exertion; be as accurate as you can.
Equipment to Measure VO2max
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Equipment to Measure VO2max
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Performing the Test
Greet the patient / client Explain the test, equipment, etc. Obtain informed consent
Obtain baseline measurements Record environmental conditions Record age, height, weight Calculate predicted Max HR, 85% Max HR Record resting HR and BP
Calibrate Equipment Instruct patient / client on how to perform the
test Treadmill use Borg Scale
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Instrument subject ECG or Polar HR
Mouthpiece / Noseclips
Begin test
Record appropriate measurements during test HR usually every 30 sec
RPE, BP at end of each stage
Use appropriate data recording sheet Terminate test when appropriate
Allow subject to actively cool-down Monitor HR and BP
Performing the Test
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Criteria for Test Termination
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Achieving True Maximal Measurement
Objective criteria are established to determinewhether a true maximal measurement was
achieved. Plateau in oxygen consumption
Increase less than 150 mLO2/min with increasing exerciseintensity
Respiratory Exchange Ratio (RER) VCO2/VO2 RER > 1.1 or 1.15
Heart Rate Within 10 beats of age-predicted max HR
RPE Scale RPE > 17
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Achieving True Maximal Measurement
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Achieving True Maximal Measurement
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Achieving True Maximal Measurement
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VO2maxStatistics
Olympic Athletes
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Age
VO2maxStatistics
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VO2maxNorms
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VO2maxNorms
l
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VO2maxClass Project
Research Question: Is there a statistically significant difference between
VO2max values obtained from a treadmill test versus
a cycle ergometry test?
Methods:
At least six students will perform a VO2max
test on a
treadmill and a cycle ergometer
We will then perform some statistical analyses to
answer the research question.