TestRX cells to LH, hence production Of Strength Muscles. Elevation of endorphins and CRF (Corticotropin Releasing Factor resulting from stress. An increase in endorphins and CRF in the central nervous system decreases the release of pituitary gonadotrophins. This increase, resulting from prolonged exercise or repetition of exercise on several consecutive days, would be responsible for decreased LH release and decreased sensitivity of Leydig cells to LH, hence production Of Strength Muscles. There is another factor that influences: it is the fluctuation of our level during the day. It does not have the same levels depending on the moment. Researchers looked at serum levels in the morning and afternoon. They noticed that in the morning production was higher than in the evening. But as we have seen, it is .