[LH episodes in high performance sports].

For the elucidation of hypothalamic factors, which predominantly cause exercise-amenorrhea 10 untrained and 6 trained volunteers were experimentally tested during 6 hours of rest (R) and 2 hours long distance run (E). The exercise exerted several physical and metabolic demands, leading to increment of LH pulse frequently mainly in trained women (interpulse-interval IPI, R: 104 +/- 50, E: 78.8 +/- 33), due to unaltered beta-endorphin (R: 6.4 +/- 2, E: 6.5 +/- 1.5) and augmented norepinephrine (R: 462 +/- 275, E: 1267 +/- 773 pg/ml). In untrained subjects LH pulses decreased in frequency, as a consequence of increased beta-E and NE (R: 6 +/- 3, E: 12.2 +/- 7.4 pg/ml) (R: 432 +/- 208, E: 947 +/- 473).