Transcript The Valsalva Effect

The Valsalva Effect
BioResearch Club
Physiology Group
What is the Valsalva Effect?
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When expiratory force is occurring, blood
pressure can rise drastically.
The pressure that builds up in the chest can stop
blood flow to the heart.
After venous activity is stalled there is a sudden
release of pressure that causes the heart’s
output to increase rapidly.
After about 24 seconds normal cardiac output
begins, the pressure usually rises before
returning to normal.
The significance of The Valsalva Effect
The effect of the valsalva maneuver
has a powerful impact on the health of
an individual.
 Patients that have heart problems are
vulnerable to severe strokes.
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Hypothesis
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Due to mass and age of subject val salva
will decrease when lifting and increase
during final lifting and descend during the
last stage of experimentation.
The Experiment
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volunteers (16-18) and parents sign waiver form
2 testing visits at 30 minutes per visit
each individual weighed
each individual undergoes a pulmonary lung function test to
measure the amount of air breathed in and out
One group is deeply familiar with proper lifting procedure and the
other group is given brief instruction on proper lifting procedure
each group will lift weight 40% of their body weight
resting heart rate recorded by ECG
10 electrodes placed on each individual
individual will lift and heart rate is monitored to record changes
recovery heart rate is recorded
time it takes to return to resting rate is recorded
Interested? This is what you can to do…
YOU need to get a permission slip
to be a part of the experiment
 YOUR parents and a witness must
sign the slip before you may
participate.
 YOU must attend the actual
experimentation session
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What’s on the Slip?
Purpose
 Participation Selection
 Explanation of Procedures
 Address of Discomfort and Risks
 Benefits
 Confidentiality
 Gender Seperation
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