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ULTIMO FASCICOLOTHE JOURNAL OF SPORTS MEDICINE AND PHYSICAL FITNESS

Rivista di Medicina, Traumatologia e Psicologia dello Sport

Indexed/Abstracted in: Chemical Abstracts, CINAHL, Current Contents/Clinical Medicine, EMBASE, PubMed/MEDLINE, Science Citation Index Expanded (SciSearch), Scopus
Impact Factor 1,111

Periodicità: Mensile

ISSN 0022-4707

Online ISSN 1827-1928

 

The Journal of Sports Medicine and Physical Fitness 1998 Giugno;38(2):138-41

 ORIGINAL ARTICLES

Basal repro­duc­tive hor­monal pro­files are ­altered in endu­rance ­trained men

Hackney A. C., Fahrner C. l., Gulledge T. P.

Endo­crine Sec­tion, Applied Phys­iology Labor­a­tory, Uni­ver­sity of ­North Car­o­lina, ­Chapel ­Hill, North Car­o­lina, USA

Objec­tive. The pur­pose was to ­examine the ­basal repro­duc­tive hor­monal pro­files in age-­matched ­groups of endu­rance ­trained (ET) and sed­en­tary (SED) men ­under con­trolled con­di­tions.
Experi­mental ­design. ­Resting ­basal ­blood sam­ples ­were ­obtained ­from ­groups of ET and SED men ­after a 24-hr con­trol ­period. ­Blood spec­i­mens ­were ana­lyzed for tes­tos­te­rone (T), ­free-tes­tos­te­rone (fT), sex-hor­mone ­binding glob­ulin (SHBG), lutein­izing hor­mone (LH), cor­tisol, and pro­lactin. The ­design of the ­study was ret­ro­spec­tive and ­cross-sec­tional in ­nature.
Set­ting. Labor­a­tory set­ting at the Uni­ver­sity of ­North Car­o­lina, ­North Car­o­lina USA.
Par­tic­i­pants. ET men (n=53) who had ­been ­involved ­with ­chronic endu­rance exer­cise ­training for ≥ 5 ­years. SED men (n=35) ­were ­selected of com­par­able ­ages and the ­fact ­that ­they had ­done no ­formal exer­cise ­training.
­Results. ­Results indi­cated ­that the ­basal T and fT of the ET men ­were sig­nif­i­cantly (p<0.01) ­lower ­than ­that of the SED men. The ­levels of ­these hor­mones in the ET men ­where in the ­normal clin­ical ­range, but rep­re­sented ­only 55% to 85% of ­those ­seen in the SED men. For ­SHBG, LH, cor­tisol, and pro­lactin, no sig­nif­i­cant dif­fer­ences (p>0.05) ­were ­found ­between the ET and SED men.
Con­clu­sions. ET men ­have low­ered ­basal T and fT ­levels and ­this sup­pres­sion may be ­related to an alter­a­tion in the hypo­tha­lamic-pitui­tary-tes­tic­ular reg­u­la­tory ­axis ­since the LH of the ET was not ele­vated. ­Whether ­these hor­monal ­changes ­have any sig­nif­i­cant ben­e­fi­cial (i.e., pro­tec­tive car­di­o­vas­cular) or neg­a­tive (i.e., ­decrease ana­bolic-andro­genic pro­cesses) phys­io­logic con­se­quences ­remains to be deter­mined.


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