I know from experience and have read many times that swim HR is about 5-10 beats on avg lower than bike, which in turn is 5-10 beats lower than running on avg.
I read that this was due to the position our bodies are in for each discipline i.e. lying, seating or standing.
I've also been told that you use more muscles running than bikeing which use more than swimming and this is why the HR are so different.
Which of these theories is correct?
Surely when you're swimming you're using alot more muscles than cycling. Cycling is just legs but swimming is legs and arms! Can anyone clarify the Swim V Bike V Run HR issue for me.