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Skeletal Muscle Pump and Effects of Chronic Endurance Training – CV Response to Exercise

by Thad Wilson, PhD
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    Other things that are helping you return blood to the heart are things like the skeletal muscle pump. The skeletal muscle pump was discussed in the venous lecture but I think it's very important to bring back here. The reason is it's because muscle pumping is occurring so often during exercise. It is actually one of the primary ways you're going to get blood back to the heart is by squeezing those muscles. So during aerobic exercise, let's say you're riding your bicycle, every time you contract your quadriceps and hamstrings you're getting them to squeeze blood and push it back up towards the heart. This contraction-relaxation cycle will just continue until you stop exercising. This, of course, increases fluid return to the central circulation, allows for greater driving pressures across the skeletal muscle. Because muscle blood flow is based upon this delta P phenomenon, a change in pressure across the vascular bed, pressure 1 minus pressure 2. So if pressure 1 is elevated because of an increase in systolic blood pressure and pressure 2 decreases a little bit because you are really pushing that blood back to the heart, you've now set up a greater pressure differential. Finally, you can increase venous return from not only the skeletal muscle pump but also with venoconstriction. If you constrict the veins, you make them less compliant, therefore they're going to have that blood travel through them quicker back up to the heart. There are a number of benefits of chronic exercise and this especially impacts the cardiovascular system and in fact you probably know many of these from your own health and fitness but you can also apply these in clinical conditions in where someone might have something like a previous myocardial infarction, maybe bypass surgery and now what you want...

    About the Lecture

    The lecture Skeletal Muscle Pump and Effects of Chronic Endurance Training – CV Response to Exercise by Thad Wilson, PhD is from the course Vascular Physiology.


    Included Quiz Questions

    1. Increase in resting stroke volume
    2. Increase in resting heart rate
    3. Decrease in maximal stroke volume
    4. Decrease in maximal heart rate
    1. Increased size of left ventricle
    2. Increase in size of right atrium
    3. Increase in size of left atrium
    4. Decreased stroke volume
    5. Decrease cardiac output
    1. Increase in collaterals
    2. Decrease in muscle mass
    3. Increase in afterload
    4. Reduction in the number of capillaries
    5. Decrease in stroke volume

    Author of lecture Skeletal Muscle Pump and Effects of Chronic Endurance Training – CV Response to Exercise

     Thad Wilson, PhD

    Thad Wilson, PhD


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