MEDI110 Lecture 9: Week 4 Lecture A, Acute Responses to Exercise, and Muscle changes
30 Oct 2018
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Document Summary
Constriction and dilation of blood vessels= rapid alteration in blood flow. Increase in energy expenditure/muscular work = rapid adjustment of blood flow. Smooth muscle in arteriole walls has change in diameter. Venous capacitance vessels stiffen forcing blood from peripheral veins into central circulation. Vasoconstriction in non-essential organs such as kidneys. Cardiac output is the transition from rest-exercise-recovery, A significant indicator of the circulatory system"s ability to meet physical demands. Linear relationship between hr,work exercise workload and vo2. Increase in systolic bp, almost no effect on diastolic bp. Loss of dilation, post-exercise asthma, air narrowing, increase resistance and airflow. Low moderate = increase in ventilation and plateu at steady rate. Muscle soreness (doms) can be caused by; Greatest force produced during rapid eccentric contractions and least during rapid concentric contractions. Greatest force is at resting length ~90 degrees. Loda and speed can affect muscle activity. Human growth hormone, epinephrine, norepinephrine, insulin, testosterone etc.
