What does it imply when my heart rate is big surrounded by frequency?

I have checked my BMI, along with other factors such as flab index, heart rate, pulse rate and anything else with a machine that is installed within the malls to check your health status. Well it not maybe inconsistent but my heart rate is almost consistent. Well, if you see on a ecg, there are lines within that means the heart rate (sorry not really familiar with medical usages), and as I own checked by this machine, my heart rate has a large frequency, or in that are long lines, something like that, while my classmates have shorter lines. I have tried twice, and in that are still long lines. I was just relaxed and place my arm over the clothlike thing to consider heart rate.

So what does long lines mean? And short lines too?
Answers:
An ECG tracing is a horizontal line interrupted by sets of vertical squiggles (otherwise known as the QRS complexes), one set for respectively heart beat. If by "long lines" you mean that the QRS complexes are tall, that have nothing to do with your heart rate. Your heart rate is determined by the spacing between the QRS waves, and should hold come up as a number on the machine.

There are many reasons for all along the QRS waves being what they are, including the size and position of the heart, the amount of fat over the chest wall, and the presence of long-standing high-ranking blood pressure.

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