Kulturizmas.net diskusijų forumas

Horm Metab Res. 2011 Mar;43(3):223-5. doi: 10.1055/s-0030-1269854. Epub 2010 Dec 10.
Effect of vitamin D supplementation on testosterone levels in men.
Pilz S, Frisch S, Koertke H, Kuhn J, Dreier J, Obermayer-Pietsch B, Wehr E, Zittermann A.
Source

Department of Internal Medicine, Division of Endocrinology and Metabolism, Medical University of Graz, Austria.
Abstract

The male reproductive tract has been identified as a target tissue for vitamin D, and previous data suggest an association of 25-hydroxyvitamin D [25(OH)D] with testosterone levels in men. We therefore aimed to evaluate whether vitamin D supplementation influences testosterone levels in men. Healthy overweight men undergoing a weight reduction program who participated in a randomized controlled trial were analyzed for testosterone levels. The entire study included 200 nondiabetic subjects, of whom 165 participants (54 men) completed the trial. Participants received either 83 μg (3,332 IU) vitamin D daily for 1 year (n = 31) or placebo (n =2 3). Initial 25(OH)D concentrations were in the deficiency range (< 50 nmol/l) and testosterone values were at the lower end of the reference range (9.09-55.28 nmol/l for males aged 20-49 years) in both groups. Mean circulating 25(OH)D concentrations increased significantly by 53.5 nmol/l in the vitamin D group, but remained almost constant in the placebo group. Compared to baseline values, a significant increase in total testosterone levels (from 10.7 ± 3.9 nmol/l to 13.4 ± 4.7 nmol/l; p < 0.001), bioactive testosterone (from 5.21 ± 1.87 nmol/l to 6.25 ± 2.01 nmol/l; p = 0.001), and free testosterone levels (from 0.222 ± 0.080 nmol/l to 0.267 ± 0.087 nmol/l; p = 0.001) were observed in the vitamin D supplemented group. By contrast, there was no significant change in any testosterone measure in the placebo group. Our results suggest that vitamin D supplementation might increase testosterone levels. Further randomized controlled trials are warranted to confirm this hypothesis.

© Georg Thieme Verlag KG Stuttgart · New York.

Nuoroda: http://www.ncbi.nlm.nih.gov/pubmed/21154195

Robšė rašė:

Ir tau google pasake, kad nuo pornuchos testas kyla?
Gal gali imest ta protinga nuoroda, kur pasakojama, kad ziurint porno pakyla kardas ir tuopat metu pakyla testosterono koncentracija kraujuje.

emexas sake

Lucaslt rašė:

Robšė rašė:

Ir tau google pasake, kad nuo pornuchos testas kyla?
Gal gali imest ta protinga nuoroda, kur pasakojama, kad ziurint porno pakyla kardas ir tuopat metu pakyla testosterono koncentracija kraujuje.

emexas sake

Ir iki kiek jam pakyla? Iki 9:30 ar iki 11:30? 

gal tiesiog pajuokavo

emexas rašė:

nejuokavau, kelia, tik tas pakilimas trumpalaikis

tai reik ziet kas 20 min td.

emexas rašė:

nejuokavau, kelia, tik tas pakilimas trumpalaikis

vartoti pries treniruote ar po?

More magnesium, more free testosterone

Men with more magnesium in their blood are likely to have a higher amount of free testosterone in their body. Chemical analysts draw this conclusion in an article published in the Journal of Pharmaceutical and Biomedical Analysis.

About two percent of the testosterone in the body is active: it is not attached to binding proteins which prevent testosterone from interacting with its receptor. About forty percent of the body’s testosterone is attached to albumin, a protein that can let go of the hormone. Free testosterone and testosterone attached to albumin are referred to as bio-available testosterone.

About sixty percent of the body’s testosterone is attached to sex hormone binding globulin (SHBG), which you can see in the illustration here from Wikipedia. Androgens bound to SHBG lose their anabolic effect but probably retain their androgenic effect. In the prostate, for example, there are SHBG receptors and they send error signs to the prostate cells if they attach themselves to SHBG with androgens bound to it. Androgen steroid hormones incorporated by SHBG therefore do have undesired effects, but no desirable effects.

As men get older, SHBG sweeps up more and more testosterone. This is also because older men eat less protein. Low protein consumption raises the concentration of SHBG in the blood. A higher protein intake results in more albumin, and that increases the amount of bio-available testosterone. Within limits, of course.

The researchers, linked to the Université de Franche-Comté, extracted SHBG from the blood of young men, and exposed the protein to magnesium ions. Then they measured how fast the testosterone attached itself to SHBG at increasing magnesium concentrations. The higher the magnesium concentration, the lower the attraction.

Although the researchers did not examine whether more magnesium actually leads to more free testosterone in humans, they believe their findings are meaningful at the physiological level.

"The results presented here provide evidence for an Mg2+-mediated variation of the testosterone-SHBG association, suggesting that an increase of the Mg2+-concentration inside the biological concentration range (0.75mM-1.0mM) could lead an enhancement of the bioavailable testosterone", they write.

Fifteen years ago researchers examined the effect of extremely high – and biologically improbable – magnesium concentrations. These led to a small decline in the testosterone level. [Horm Metab Res. 1993 Jan;25(1):29-33.]

The researchers have announced that they will soon be publishing their findings on the effect of plant substances on the binding of testosterone to SHBG.

Magnesium in food is found in plant products. Good sources are fibre-rich breakfast cereals, spinach, nuts and beans.

Sources:
Journal of Pharmaceutical and Biomedical Analysis, doi:10.1016/j.jpba.2008.10.041

http://www.kulturizmas.net/forumas/p496288#p496288

Valde222 rašė:

gal kas bandet athlet tribulus 1000mg 45 proc saponino ?

lygiai toks pat kaip ir milijonas kitu 45% saponinu.

Valde222 rašė:

tai pagrindas saponinas stiprumas kad 1000 neturi reiksmes ?

1000mg yra tabletes dydis.

sveiki noreciau paklausti animal m-stak raso vartoti netreniruociu dienomis viena pakeli rite, o tai ant tuscio skrandzio galima vartoti ar po pusriciu ?

gal kas esate bande siuos papildus?
FUSION SUPPLEMENTS ATD anti-estrogen
FUSION SUPPLEMENTS 6-BROMO
FUSION SUPPLEMENTS POST CYCLE MATRIX
pats esu 30 metu, bet nei tribulusas labai jautesi nei zma.
patis geriausi atsiliepimai apie animal test, bet deja dileriai kas kodel nebeprekiauja, manau kaina gasdina pirkejus. o dazniausiai jaunuoliai nusipirkdavo jiems ir neveikdavo, prirasydavo kad neveikia. ir tai labai suklaidina viresnio amziaus zmones. taigi jieskau alternativos. tai ka galite patarti ar pasiuliti, kaip jusu manimu auksciau pateikti mano papildai? gal yra kas kas geriau?
Aciu

Paskutinį kartą taisė Tole (2013-02-11 15:35)