[hello1234567]

Hi, I am stuck with this question..

can anyone help?
I did an experiment to measure pulse rate after exercise and had to measure pulse rate every 30 seconds.. I dont know why we had to do this though.

why did you take 30 second intervals after exercise to measure your pulse rate in your experiment?

[purplefrog]

There is nothing special about the 30 second interval... it is probably just a regular interval for you to record it so you can later measure changes to see its change in rate. It could have quite easily been measure after a 45 secs, a minute or even every 75 seconds etc... completely arbitrary. Through obviously the more regularly you measure it, the more representative your data will be.

[SuperheroSam]

To see how quick your heart rate returns to normal after exercise.

[Clare~Bear]

So you can see a change in rate easier as it's unlikely to be a straight line. It could have been any interval within reason.