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12/19/11 Background InformaDon •  Gas exchange is dependent on venDlaDon The Effect of Posture on Breathing, Pulse and ECG By First and last name 1 First and last name 2 First and last name 3 First and last name 4 –  InspiraDon fills the alveoli with fresh air, and expiraDon removes stale air •  CO2 concentraDon in the plasma controls respiratory depth and rate –  Poor posture provokes respiratory changes, therefore leads to labored breathing Background InformaDon Variables •  ResDng pulse is faster in an upright posture such as standing and siMng, compared with the lying posiDon •  The R-­‐wave amplitude of the ECG is influenced by the angle of projecDon of the leQ ventricular electrical field in relaDon to the anterior thoracic surface, thus R-­‐wave amplitude changes with the cardiac axis •  Independent Variable -­‐ Posture •  Dependent Variables -­‐ Breathing depth, pulse rate, and R wave amplitude 1 12/19/11 Hypothesis •  We predict that when siMng up straight, breathing depth, pulse rate, and R wave amplitude will be normal •  However, when siMng with poor posture, breathing depth and pulse rate will increase and R wave amplitude change Results Effect of posture on breathing depth Method 1. The subject was hooked up to the electrodes, pulse transducer, and respiratory belt. 2. For the first 2 min, we measured the baseline of the subject siMng straight. 3. The subject then sat in a hunched over posiDon with her feet up for 5 min. 4. A recovery period was then measured for 2 min with the subject siMng up straight. 5. This was repeated again for subject 2. Results Effect of posture on pulse rate 2 12/19/11 Results Discussion Effect of posture on R wave amplitude •  Poor posture decreases the thoracic cavity volume forcing breathing depth to increase to bring more fresh air into the lungs •  Chemoreceptors detect high level of CO2 in the plasma •  Therefore, breathing depth increases to promote diffusion of CO2 out of the body •  Pulse rate would increase because the body has a greater need for O2, to increase blood flow to get more O2 in the Dssues Discussion ConDnued •  The R-­‐wave amplitude of the ECG increased for only one subject, most likely due to the change in the posiDon of the heart in the thoracic cavity. Future Experiments • 
Test the effects of other posiDons Use more subjects in the experiment Record data for longer Dme periods Long term effects of posture on physiology •  Our hypothesis was proven correct for 2 out of 3 predicDons. 3 12/19/11 References •  Jones, A. (2003). Changes in heart rate and r-­‐ wave amplitude. Chinese Journal of Physiology 46, 63-­‐69. •  Greur, G. (2011). Posture and breathing. Journal of Physiology 56, 1-­‐12. •  Seeley, R., VanPube, C., Regan, J., Russo, A. (2011). Seeley’s Anatomy and Physiology. McGraw Hill. 4