Heart rate zones and testing for Lactate Threshold.

Ok Here is some information that I am dealing with. When performing endurance sport activities, such marathons and Ironman triathlon, it is very helpful to know what heart rate you can maintain for an extended period of time.  Your heart rate is like a gas gage that lets you keep moving at a pace in a certain heart rate zone.  The zones are from 1 to 5 and a zone of 1 is low and 5 is max.  There is a point of effort that your body can sustain a heart rate and metabolize the energy and nutrients in your body for an extended period of time.  That point is your aerobic threshold.

Rob is getting a blood lactate test done by David which involves taking a blood samples at a progression of heart rates to determine your lactate threshold. Knowing which HR zone can be maintained for extended periods of time and which zone you need to be in for shorter but harder efforts, helps in training and recovery.