Today (July 18) I did a lactate threshold (LT) and a VO2Max test at the Carmichael Training Systems (CTS) office in Colorado Springs. With just a few weeks to go before the cross country ride it was time to see where my conditioning really was and make adjustments. The tests results were somewhat surprising.
First was the LT test. The point of this test is to determine when the body is producing more lactic acid than it can process. I am sure I read once it is the point where you are burning only carbohydrates instead of a mix of carbos and fat but I can't find that source. Certainly once you do pass LT you are riding on borrowed time.
To do the test you warm up then a blood sample is taken by pricking a finger to get a baseline. Then they put nose clips on you, a breathing apparatus in your mouth, and you start riding. The computer controls the amount of wattage you produce and it steps it up 25 watts every three minutes. Every step another blood sample is taken and that gets pretty annoying. Can't complain because of the breathing mouth piece.