Blood Lactate Testing for Aerobic Threshold (AeT): 2mMol/L One of the best uses of your meter is to pinpoint your Aerobic Threshold. Nailing down this metabolic breakpoint will define the upper end of your Zone 2 and can help determine if you are aerobically deficient. According to an official definition: "It's a test that measures the amount of lactic acid in your blood. This acid is made in muscle cells and red blood cells. It forms when your body turns .

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