These are 2 tests that allow you to train better. The HR (Heart Rate) test determines certain training zones. These zones have many names. Lactic threshold etc., we refer to them as training pace and Race pace. Training pace is a heart rate low enough to allow your body to do things other than your exercise, such as digest food. At race pace your intensity is so high that your heart is continually pumping to remove lactic acid from your muscles. There is no blood for anything else. As you could gather you cannot exist at race pace for very long. Your body can only store so much fuel.
So during an ironman or even a half ironman you need to know these rates to finish the race. You need to take in food and you need to digest it so your body can use it. I have trained with heart rate zones for 4 years now. i have found it a very effective tool.
The calorie test is new to me. It will let me know how good my body is a burning fats. In long endurance races you need to burn fat. You cannot store or replenish carbohydrates fast enough to fuel your self during an ironman event.
BTW I have officially sighned up for Ironman Louisville!!!!!!!!!!!!!!!!!!!!!
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