Cardiovascular changes Cardiovascular changes. Changes in (A) cardiac output (Q̇), (B) stroke volume (SV), and (C) heart rate (HR) at rest, during submaximal exercise up to a steady state intensity, and during the post-exercise recovery period. Source: Acute and Chronic Cardiorespiratory Responses to Exercise, Exercise Physiology Citation: Porcari JP, Bryant CX, Comana F. Exercise Physiology; 2015 Available at: http://fadavispt.mhmedical.com/DownloadImage.aspx?image=/data/books/2182/exercphys_ch8_f001-1.png&sec=165656889&BookID=2182&ChapterSecID=165656873&imagename= Accessed: November 06, 2017 Copyright © 2017 McGraw-Hill Education. All rights reserved