-Elvirus- Posted April 24, 2009 Report Share Posted April 24, 2009 P-piller og bodybuilding er en dårlig kombinationKvinder, der tager p-piller, har en væsentlig mindre effekt af træningen. Det viser en ny amerikansk undersøgelse ifølge Jyllands-Posten onsdag. 73 kvinder i alderen 18-31 år deltog i en undersøgelse ledet af forskere fra Texas A&M University og University of Pittsburgh. Deltagerne blev delt i to lige store grupper, hvor halvdelen tog p-piller, mens den anden halvdel undlod pillerne. Begge grupper fik i forsøgsperioden ekstra protein for at have sikkerhed for, at de fik protein og kalorier nok til at udvikle musklerne, og grupperne gennemgik det samme træningsprogram. Resultaterne viste, at kvinder, som ikke tog p-piller, opnåede 60 procent større muskelvækst efter ti ugers træning. xeyelessx 1 Quote Link to comment Share on other sites More sharing options...
Mads Thøgersø Posted April 24, 2009 Report Share Posted April 24, 2009 Det forklarer mine middelmådige resultater! Quote Link to comment Share on other sites More sharing options...
-Elvirus- Posted November 2, 2009 Author Report Share Posted November 2, 2009 Lidt uddybende fra samme (nu "gamle") nyhed. http://www.videnskab.dk/content/dk/krop_su...kten_af_traning Quote Link to comment Share on other sites More sharing options...
tjr Posted November 3, 2009 Report Share Posted November 3, 2009 Er det ikke simpelt/logisk nok, at mere østrogen = lavere muskeltilvækst? Quote Link to comment Share on other sites More sharing options...
-Elvirus- Posted November 10, 2009 Author Report Share Posted November 10, 2009 Nu med lidt frisk dansk forskning på området (man skulle virkelig tro jeg var meget interesseret i dette emne )Scand J Med Sci Sports. 2009 Oct 22. [Epub ahead of print]Effect of administration of oral contraceptives on the synthesis and breakdown of myofibrillar proteins in young women.Hansen M, Langberg H, Holm L, Miller BF, Petersen SG, Doessing S, Skovgaard D, Trappe T, Kjaer M.Institute of Sports Medicine, Bispebjerg Hospital, Copenhagen, Denmark.Oral contraceptive (OC) treatment has an inhibiting effect on protein synthesis in tendon and muscle connective tissue. We aimed to investigate whether OC influence myofibrillar protein turnover in young women. OC-users (24+/-2 years; Lindynette(®)n=7, Cilest(®)n=4) and non-OC-users (controls, 24+/-4 years n=12) performed one-legged kicking exercise. The next day, the myofibrillar protein fractional synthesis rate (FSR) was measured using stable isotopic tracers ((13)C-proline) while the subjects were fed standardized nutrient drinks. Simultaneously, a marker for myofibrillar protein breakdown, 3-methyl-histidine (3-MH), was measured in the interstitial fluid of the vastus lateralis. Measurements were performed in both legs. In general, myofibrillar protein FSR was lower in OC-users (two-way analysis of variance, P<0.05), although the difference seemed to depend on the OC type. Interstitial 3-MH in the skeletal muscle was not different between groups and did not vary by OC type. Exercise did not change myofibrillar protein FSR or 3-MH concentrations. Serum androstenedione and bioavailability of testosterone were lower in OC-users. In conclusion, the results indicate that the use of OC has an inhibiting effect on myofibrillar protein synthesis and the magnitude of the effect may depend on the type of OC. In contrast, there was no effect of OC on myofibrillar protein breakdown in the fed state. Quote Link to comment Share on other sites More sharing options...
incognito Posted November 11, 2009 Report Share Posted November 11, 2009 der er faktisk flere ting der tyder på at østrogen og østradiol har en svag vævsopyggende effekt. Den hæmmende komponent i p-pillerne tyder mere på at være de syntetiske progestiner. Desværre er der temmeligt mange forskellige typer progestiner i brug i forskellige præparater og der er faktisk også nogle ting der tyder på at de har forskellige effekter indbyrdes. Derfor bruges der nu en del kræfter på at karakterisere disse progestiner. Quote Link to comment Share on other sites More sharing options...
Devious Builder Posted November 12, 2009 Report Share Posted November 12, 2009 nå for satan.. så er det nok ikke vitamin piller jeg har gået og spist ude hos veninden :-P Quote Link to comment Share on other sites More sharing options...
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