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Blood Pressure Effects on the Valsalva Maneuver – CV Response to Exercise

by Thad Wilson, PhD
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    One thing you always have to be cognizant of when you are doing either isometric exercise or isotonic exercise is what you are doing with your breath. It's very easy to hold your breath during these maneuvers causing the strain-like response. We call this a Valsalva maneuver and it's a forced expiration against the closed glottis, a bearing down movement. As you do that response, you get corresponding changes in blood pressure. There are four different phases associated with the Valsalva or breath hold like that. First you get an increase in blood pressure then you get a decrease in blood pressure as the baroreflex kicks in and then once you release that bearing down or the holding your breath, you get a reflex increase in blood pressure and then it comes back to normal. So why this is important is because your blood pressure response to exercise is affected by your breath when you're doing that particular exercise. So let's look now more closely what happens if you do resistance exercise without holding your breath. During resting conditions, we have this kind of boxes that we're going to use for blood pressure. The top part of the box is your systolic blood pressure, the bottom portion of the box is your diastolic blood pressure and that red line that's mean arterial blood pressure. So we have blood pressure now plotted on the Y axis and first you're in resting conditions meaning that maybe you're on a weight machine but you haven't actually done any work yet. If you do light to moderate exercise, you have an increase in systolic blood pressure, increase in diastolic blood pressure and an increase in mean pressure. If you do moderate to vigorous exercise with resistance training, you get even larger increases in systolic...

    About the Lecture

    The lecture Blood Pressure Effects on the Valsalva Maneuver – CV Response to Exercise by Thad Wilson, PhD is from the course Vascular Physiology.


    Included Quiz Questions

    1. Increase in diastolic blood pressure
    2. Increase in stroke volume
    3. Decrease in afterload
    4. Decrease in heart rate
    1. By increasing pressure
    2. Decreasing pressure
    3. Decreased production of hydrogen ions
    4. Decrease in calcium
    5. Decrease contractility

    Author of lecture Blood Pressure Effects on the Valsalva Maneuver – CV Response to Exercise

     Thad Wilson, PhD

    Thad Wilson, PhD


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