Hi there, just looking for advice, I train 3-4 times a week in gym doing 2.5 to 3 hour sessions including running, cycling, rowing and weights. Started doing this back in June 2009 and went from 15.7 stone at that time to 12.0 stone presently in that space of time. Last year I started doing martial arts as well so it helped me in my general fitness and lost more weight with it. However each time I run on threadmill which can be at anything from 15.5km/h to 18.0km/h, a message comes on the threadmill display unit saying "attention your heart rate is high" this comes on when my heart goes over 170beats per minute. I have only turned 26 years of age, but this message freaks me out when I see it and I cant push myself as much as I like to.
I would run at these speeds for 3-4 mins just for burning calories fast, but I normally do long runs at 13.0km/h (35mins) and no message will appear then. The message just appears when I run anything over 15.0 km/h.
Anything I should be worried about?