Aerobic Threshold
The aerobic threshold (AeT) is sometimes defined as the exercise intensity at which anaerobic energy pathways start to operate and where blood lactate reaches a concentration of 2 mmol/litre (at rest it is around 1). This tends to be at a heart rate of approximately 20-40 bpm less than the anaerobic threshold and correlates with about 65% of the maximum heart rate. The anaerobic energy system does not utilize oxygen to create Adenosine triphosphate (ATP) and uses glycogen/glucose. Lactic acid is the by-product of creating ATP for working muscles.
Read more about this topic: Lactate Threshold
Famous quotes containing the word threshold:
“I had a good talk with Alcott this afternoon. He is certainly the youngest man of his age we have seen,—just on the threshold of life. When I looked at his gray hairs, his conversation sounded pathetic; but I looked again, and they reminded me of the gray dawn.”
—Henry David Thoreau (1817–1862)