heart beat rate plot

[Joaana]

hi,

 I have to plot the heart beat rate. I have calculated the RR interval ..but am unable to get the right plot for measuring the heart beat rate variations. Can any 1 plzz help me out.

[Graziano]

Hi Joaana,
   what are you exactly trying to plot? Heart pulses ("those peaks you see in ER instruments, don't know how it's in english ), or are you plotting something like the time between pulses, and updata plot each time you get a beat? Please explain....

   Have a nice day?

graziano

[johnsold]

Joanna,

Heart rate variations are tricky to plot. The variable being plotted, the RR intervals, is in units of time and is usually plotted against time. But, because of the nature of the data the "sampling" interval is not constant. Thus, the X-axis values are not uniformly distributed.

You need to decide and define very carefully exactly what you want to plot. For example if you want the current value of the RR interval plotted once per second, two things will happen, both of which may not be desirable: One, some RR interval values will be plotted more than once. Two, some RR interval values will not be plotted at all. If you plot an average over 10 or 20 seconds or longer, you start to lose some of the variability information. If you just plot an array of RR intervals on a graph, you will get all the data, but the X-axis represents indexes (indices?) in the array and not time. You can calculate a cumulative time value and plot the RR intervals against that on an XY graph. Try some of these and see what make sense for the way you intend to interpret the data.

Lynn

[Henrik_Volkers]

Using the XY-graph. X is time, Y your BPM (BeatsPerMinute) , On every Heartbeat you have your time on the X and together with the last (n) beat you calculate the BPM.

I remember plotting that curve a...more than 20 years ago, just builded up my first homebrew kardio and used a (even for that time old) C64 for plotting   Had been lucky not to kill myself with that and other experiments   

A nice thing to observe was pushing up your puls (pull up, sitt up, ....) and than start to medtate : the BPM ramp down rapidly, your vegetative system calls for more oxigen so it ramp up a bit, continue to sink , go up and down