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Work out cardiac cycle and heart rate

  1. Nov 11, 2015 #1
    I would just like to know if i have worked out one cardiac cycle and heart rate correctly.
    I have attached the image of the ecg called 'after exercise'

    here are my workings out:

    1. CARDIAC CYCLE:

    there are 4 cycles so:
    9 (grids) x 0.05 = 0.45
    9x 0.05 = 0.45
    9x 0.05 = 0.45
    9x 0.05 = 0.45

    average = 0.45 x 4/4 = 0.45

    so cardiac cycle = 0.45 seconds

    2. HEART RATE:
    60/0.45 =133 bpm

    are these worked out correctly?
     

    Attached Files:

    Last edited: Nov 11, 2015
  2. jcsd
  3. Nov 11, 2015 #2

    berkeman

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    Staff: Mentor

    I'm seeing one heartbeat every 10 grid lines. Are you sure about your 9 grid lines number?
     
  4. Nov 11, 2015 #3
    Oh, dammit i was counting the spaces between the lines.
    So you have to count the lines? then yeah it should be 10.

    so its:
    1. CARDIAC CYCLE:
    there are 4 cycles so:
    10 (grids) x 0.05= 0.5
    10x 0.05 = 0.5
    10x 0.05 = 0.5
    10x 0.05 = 0.5

    average = 0.5 x 4/4 =0.5

    so cardiac cycle = 0.5 seconds

    2. HEART RATE:
    60/0.5 = 120 bpm

    is this right?? :smile:
     
  5. Nov 11, 2015 #4

    berkeman

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    Staff: Mentor

    That's what I got as well. :smile:
     
  6. Nov 11, 2015 #5
    i just uploaded another ECG called 'resting' as i cant tell how many grids there are. I counted 15 ? for each cycle, what about you?
     
  7. Nov 11, 2015 #6

    berkeman

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    Staff: Mentor

    Yep, I get 15 as well.
     
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