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I've also been going to the gym for a while as well. Every couple of months
I get a fitness assessment which involves being put onto a bike which slowly
has its resistance increased until either your muscles give out or you have
to stop due to your cardio system saying "Stop!". During this they measure
your heart rate.
The peaks shown on the graph correspond to when I had to stop, either due to
my muscles not being able to push against the load any more or due to my body
saying "Stop!".
Click on the graph to the right to see the full sized graph of how I've been
doing.
It should be noted that the gym has changed the bikes they use and since the
new bikes are quite different to the old ones it is not very sensible to make
comparisons between the two; hence the two graphs shown. The heart rate is all
over the place with the new fitness test thanks to the bike varying its tension
based on the speed you are peddling.
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