Swimming and Heart Rate Training
Earlier I was concerned about a discrepancy in my MHR (maximum heart rate) while swimming as compared to running yet feeling out of breath nonetheless. Well apparently, we have MHRs for different sports. It has to do with the amount of muscle mass being used to propel the body, gravity, buoyancy. In Total Heart Rate Training by Joe Friel, he states that Lactate Threshold is more effective at measuring training zones and not necessarily heart rate. As an athlete gets fitter, their heart rate is lowered as the body becomes more efficient at performing. This is a great reference book.