PI Lab - Exercise produces a significant change in the T-P...

Info iconThis preview shows pages 1–2. Sign up to view the full content.

View Full Document Right Arrow Icon
interval of an ECG. Introduction The problem being investigated in this experiment is: Which ECG component(s) will have the most change in duration in response to exercise? We will learn which components of an ECG (T-P segment, P-R interval, Q-T interval, R-R interval, and Heart Rate) will be affected the most by exercise, and be able to explain why. Heart rate is regulated by the autonomic nervous system (ANS). The parasympathetic subdivision of the ANS controls the heart rate during calm, resting situations, while the sympathetic division of the ANS controls heart rate during stressful and physically demanding situations, such as exercise. During exercise and other stressful situations, heart rate increases. Electrical and mechanical cardiac outputs are correlated because the electrical impulses send signals to the sinoatrial and atrioventricular nodes, which in turn send signals to the heart muscle to keep it beating. The T-P segment shows the time when atria and ventricles are relaxed and the ventricles are filling with blood. This means that the T-P segment represents the period of time between ventricular repolarization and atrial depolarization. The P-R interval represents the time it takes for the depolarization wave to travel along the atria and from the atria to the ventricles via the AV-bundle. This means that the P-R interval represents the time period between atrial depolarization and ventricular depolarization. The Q-T interval represents the time period of ventricular depolarization and repolarization. (Campos et al, 2007).
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Image of page 2
This is the end of the preview. Sign up to access the rest of the document.

This note was uploaded on 04/28/2008 for the course BIOL 221L taught by Professor Lust during the Spring '07 term at CSB-SJU.

Page1 / 5

PI Lab - Exercise produces a significant change in the T-P...

This preview shows document pages 1 - 2. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online