Work out cardiac cycle and heart rate

[shadows122]

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?

 

[berkeman]

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?

I'm seeing one heartbeat every 10 grid lines. Are you sure about your 9 grid lines number?

 

[shadows122]

I'm seeing one heartbeat every 10 grid lines. Are you sure about your 9 grid lines number?

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??

 

[berkeman]

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??

That's what I got as well.

 

[shadows122]

That's what I got as well.

i just uploaded another ECG called 'resting' as i can't tell how many grids there are. I counted 15 ? for each cycle, what about you?

 

[berkeman]

i just uploaded another ECG called 'resting' as i can't tell how many grids there are. I counted 15 ? for each cycle, what about you?

Yep, I get 15 as well.