Send the link below via email or IMCopy
Present to your audienceStart remote presentation
- Invited audience members will follow you as you navigate and present
- People invited to a presentation do not need a Prezi account
- This link expires 10 minutes after you close the presentation
- A maximum of 30 users can follow your presentation
- Learn more about this feature in our knowledge base article
Do you really want to delete this prezi?
Neither you, nor the coeditors you shared it with will be able to recover it again.
Make your likes visible on Facebook?
You can change this under Settings & Account at any time.
IB 132L: Independent Investigation II
Transcript of IB 132L: Independent Investigation II
Eileen Qiu Cardiovascular Effects of
Hyperventilation and Rebreathing IB 132L Independent Investigation 2 1.) Normal
2.) Hyperventilation with shallow, quick breaths (1.5 mins at 150 breaths/min)
3.) Hyperventilation with deep, forceful exhalation (1.5 mins at 78 breaths/min)
4.) Breathing into a paper bag with nose plugged (3.5 mins at 30 breaths/min) Introduction Discussion Methods Number of Subjects: 3 BREATHING PATTERNS We need Air Without oxygen, the brain usually dies within 5 minutes
Breathing moves air in and out of the lungs, and is the process of gas exchange References Measuring Heart Rate:
Pulse Oximeter Measuring Blood Pressure: Sphygmomanometer Different Breathing Patterns Rebreathing Hyperventilation Breathing in exhaled air leads to an increase in CO2 levels
A common remedy: breathing into a bag
usually a symptom of psychological causes, such as panic disorders
characterized by rapid, deep breathing
leads to low CO2 levels in the body
symptoms of hyperventilation include light-headedness and fainting
not enough blood gets to the brain due to vasoconstriction of blood vessels Teamwork! With collected data, we performed 2-tailed, paired t-tests between normal breathing data and each of the 3 breathing patterns to determine statistical significance Results http://graphics8.nytimes.com/images/2008/05/12/science/real_190.jpg Effects of CO2 on Heart Rate Mithoefer JC, Kazemi H. Effect of Carbon Dioxide on Heart Rate. Journal of Applied Physiology: Volume 19 - No. 6 (1151-1156). November 1964.
Price, Henry. Effects of Carbon Dioxide on the Cardiovascular System. Anesthesiology: Volume 21 - Issue 6 (652-663). November/December 1960. CO2 makes the blood more acidic. This decrease in pH is thought to be responsible for the decrease in heart rate (Price 1960). There is also evidence for a more direct causal relation between blood CO2 concentration and heart rate (Mithoefer et al. 1964). Effects of CO2 on Blood Pressure CO2 is a vasodilator
(it widens blood vessels, decreasing resistance to blood flow) Conclusion Limitations We could not measure CO2 exhalation or blood CO2
Each person has a different body chemistry
Small sample size: only 3 subjects Future research Meditation to lower blood pressure/ hypertension and heart rate Hypothesis Questions? http://ehrig-privat.de/ueg/images/breathe_in-out.JPG The Purpose of Study To figure out whether rebreathing with a paper bag is an effective treatment of hyperventilation Breathing into a paper bag is an effective method of treatment for hyperventilation because it helps lower heart rate and blood pressure. * p-values < 0.05 show statistical significance Our data was consistent with our hypothesis; rebreathing resulted in lower heart rate and blood pressure.