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Heart Rate Ranges and Gap Junction Channels – Heart Rate and Electricity

by Thad Wilson, PhD
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    What’s the normal range of heart rate? Heart rate – SA node heart rate, you want to know, it's between usually, what? 60 and 100 beats. So, if you're anywhere between 60 and 100, it’s considered normal. If you're outside these normal ranges, if you're above normal, we call that tachycardia. If you're below normal, we call it bradycardia. So, these are just the terms that are given when you're outside those normal ranges. Now, are there times in which a normal healthy person should be above 100 beats per minute? Sure! How about if you're exercising? You normally – there are sometimes when heart rate needs to be that high. So, it's not abnormal. It's just called tachycardia. If you're below 60 – that's bradycardia – and that is oftentimes too could be normal. Someone who is very fit, very athletic, especially from aerobic endurance exercise, oftentimes will have heart rates lower than 60 beats per minute. Perfectly normal for them. What is your maximal heart rate? That is usually denoted through this, 220 minus age. It decreases as you get older. So, you will have a lower maximal heart rate at a higher age than you do when you're young. Now, this 220 minus age, this is a formula and this is basically an estimate. You don't exactly know because the standard deviation is about 15 beats. That means, you could be two standard deviations off the mean to be 30 beats different than That means, you could be two standard deviations off the mean to be 30 beats different than what this formula is telling you, but it does give you some insight into what your maximal heart rate might be. And why is this sometimes important? Well, if you know what your maximal heart rate is,...

    About the Lecture

    The lecture Heart Rate Ranges and Gap Junction Channels – Heart Rate and Electricity by Thad Wilson, PhD is from the course Cardiac Physiology. It contains the following chapters:

    • Heart Rate Ranges
    • Propagation of Depolarization in Ventricular Myocytes
    • Gap Junction Channels
    • Membrane-potential Changes

    Included Quiz Questions

    1. …220 minus your age.
    2. … 295 minus your age.
    3. … 280 minus your age.
    4. … 200 minus your age.
    5. … 120 minus your age.
    1. Gap junctions
    2. Tight junctions
    3. Desmosomes
    4. Anchoring junctions
    5. Hemidesmosomes
    1. Sodium and calcium move into the cell
    2. Sodium and potassium move out of the cell
    3. Potassium and calcium move into the cell
    4. Calciumand sodium move out of the cell
    5. Sodium moves out of the cell

    Author of lecture Heart Rate Ranges and Gap Junction Channels – Heart Rate and Electricity

     Thad Wilson, PhD

    Thad Wilson, PhD


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