Part of scientist badge to measure and discuss pulse
Tell the Cubs that they can tell how fast their herat is beating by taking their pulse. Ask if any of them
knows how to take their pulse and then make sure that they all understand what they are doing –
some will struggle with this!
Explain that everyone has a slightly different pulse rate, but that their pulse rate should be
somewhere between 60 and 110 beats per minute.
Get them to take their pulse for 30 seconds and then double it (to give the number of beats per
minute). Leaders will need to help out and we may need to time several lots of 30 seconds to make
sure they all do it. Tell them to write this down in the space in their books.
Get cubs to sit and find their pulse while relatively calm, discuss what a pulse is (a measure of the rate the heart beats) and why it might get faster or slower. Sit for one minute and measure their pulse (normal person should be between 70 and 100 beats per minute) then do one minute of vigorous exercise (i.e. leader shouts; running on the spot, star jumps, squats, high jumps etc) then immediately measure pulse again for one minute. During exercise the cells demand more oxygen so the heart needs to beat faster to provide the fresh blood that the cells need. Discuss this in more detail...