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The lactate threshold (LT) (or lactate inflection point (LIP) or anaerobic threshold (AT)) is the exercise intensity at which lactate (more specifically, lactic acid) starts to accumulate in the blood stream.
There is a direct correlation between your exercise intensity and the amount of thyroid hormone you produce. In other words, low thyroid levels are associated with low-intensity exercise, and as you increase your intensity level, your thyroid levels increase too. Exercise performed at the anaerobic threshold causes prominent changes in hormone values, and they continued to rise up to 90% of max heart rate [2].