Odo hat geschrieben:
the changes they measured might be sufficient to cause subclinical fertility problems in some male runners. Probably the important practical point from these findings is that male runners should consider stopping running if their wives are having difficulty becoming pregnant.
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knapp nach Souza (1994) gab es auch eine prospektive Studie von Marathonläufern: Fertil Steril. 1995 Dec;64(6):1189-96., Prospective study of hormonal and semen profiles in marathon runners, Jensen CE, Wiswedel K, McLoughlin J, van der Spuy Z.: "The semen volume and sperm motility and morphology fell significantly during training, but there was no significant alteration in the sperm count. This longitudinal study demonstrates that endurance training can modify significantly hormonal profiles and semen parameters in long-distance runners."
Zur Reversibilität: Int J Sports Med. 2006 Sep;27(9):680-9, Reproductive profile of physically active men after exhaustive endurance exercise (EEE), Vaamonde D, Da Silva ME, Poblador MS, Lancho JL.: "Two weeks of EEE produced hormonal and seminological values in the experimental group that were statistically different from their own pre-treatment values ... the measured parameters almost returned to pre-treatment levels in the experimental group 2 - 3 days after EEE ended."
Problem dabei: EEE wurde auf dem Ergometer durchgeführt. Vergleiche dazu: J Appl Physiol. 1996 Dec;81(6):2627-36., Reproductive function in male endurance athletes: sperm analysis and hormonal profile., Lucía A, Chicharro JL, Pérez M, Serratosa L, Bandrés F, Legido JC.: "Despite significant differences in training characteristics and in body fat percent, in general no significant differences (P > 0.05) were found in hormonal profiles or in semen characteristics between or within groups (cycling, running, triathlon, sedentary). A lower sperm motility (46.2 +/- 19.5%), however, was observed in the cyclists during the competition period when compared either with the other groups during this same period (P < 0.05) or with themselves during the other two periods of study (P < 0.01). In any case, the later phenomenon was attributed to physical factors associated with cycling, such as mechanical trauma to the testis and/or increased gonadal temperature."
auch hier das "Problem" Triathlon: Fertil Steril. 2009 Dec;92(6):1941-6. Epub 2008 Nov 14.
Response of semen parameters to three training modalities., Vaamonde D, Da Silva-Grigoletto ME, García-Manso JM, Vaamonde-Lemos R, Swanson RJ, Oehninger SC., "Sperm concentration; total sperm number; type "a," "b," and "d" velocity; and morphology were significantly different among the practitioners of the three different training modalities. Morphology was the parameter showing the greatest difference, even reaching clinical relevance for the triathlete group (4.7%, poor prognosis pattern). In addition, these parameters tended to decrease as training requirements increased."
Im Unterschied zu Jensen et al. wurden die letzten zwei Studien an recht jungen (<30) Athleten durchgeführt, während Jensen's ältester Proband 54 war. Altersschnittdaten habe ich nicht, aber ich vermute, daß die Sensibilität der Spermienproduktion auf Ausdauerbelastung mit steigendem Alter zunimmt.
Mein erster Rat wäre, wenn das Spermiogramm aus dem laufenden Training heraus gemacht wurde, aufgrund Vaamonde et al. 3 Tage Trainingspause einzulegen und dann erneut ein Spermiogramm abzunehmen. Wenn die letzte Belastung bei der bereits erfolgten Messung allerdings bereits 2 Tage zurücklag, dann bringen die 3 Tage wohl nix, dann muß man länger pausieren, vielleicht eine Woche oder so. Wenn sich dann aber noch immer nix ändert, dann liegt es wohl auch nicht am Laufen. Ich nehme an ein Hormonstatus wurde gemacht und da ist alles o.B.?