Najpierw rozprawimy sie z ZMA :)
1: Eur J Clin Nutr. 2009 Jan;63(1):65-70. Epub 2007 Sep 19.
Links
Serum testosterone and urinary excretion of steroid hormone metabolites after administration of a high-dose zinc supplement.
Koehler K, Parr MK, Geyer H, Mester J, Schänzer W.
Institute of Biochemistry, German Research Centre of Elite Sport, German Sport University Cologne, Cologne, Germany. [email protected]
OBJECTIVES: To investigate whether the administration of the zinc-containing nutritional supplement ZMA causes an increase of serum testosterone levels, which is an often claimed effect in advertising for such products; to monitor the urinary excretion of testosterone and selected steroid hormone metabolites to detect potential changes in the excretion patterns of ZMA users. SUBJECTS: Fourteen healthy, regularly exercising men aged 22-33 years with a baseline zinc intake between 11.9 and 23.2 mg day(-1) prior to the study. RESULTS: Supplementation of ZMA significantly increased serum zinc (P=0.031) and urinary zinc excretion (P=0.035). Urinary pH (P=0.011) and urine flow (P=0.045) were also elevated in the subjects using ZMA. No significant changes in serum total and serum free testosterone were observed in response to ZMA use. Also, the urinary excretion pattern of testosterone metabolites was not significantly altered in ZMA users. CONCLUSIONS: The present data suggest that the use of ZMA has no significant effects regarding serum testosterone levels and the metabolism of testosterone in subjects who consume a zinc-sufficient diet.
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Drugie badanie bylo zrobione bodajze przez Richard'a Kreider'a a dotyczylo zmassa firmy cytodene
J Int Soc Sports Nutr. 2004 Dec 31;1(2):12-20.
Links
Effects of Zinc Magnesium Aspartate (ZMA) Supplementation on Training Adaptations and Markers of Anabolism and Catabolism.
Wilborn CD, Kerksick CM, Campbell BI, Taylor LW, Marcello BM, Rasmussen CJ, Greenwood MC, Almada A, Kreider RB.
Exercise & Sport Nutrition Lab, Baylor University, Waco, TX.
ABSTRACT : This study examined whether supplementing the diet with a commercial supplement containing zinc magnesium aspartate (ZMA) during training affects zinc and magnesium status, anabolic and catabolic hormone profiles, and/or training adaptations. Forty-two resistance trained males (27 +/- 9 yrs; 178 +/- 8 cm, 85 +/- 15 kg, 18.6 +/- 6% body fat) were matched according to fat free mass and randomly assigned to ingest in a double blind manner either a dextrose placebo (P) or ZMA 30-60 minutes prior to going to sleep during 8-weeks of standardized resistance-training. Subjects completed testing sessions at 0, 4, and 8 weeks that included body composition assessment as determined by dual energy X-ray absorptiometry, 1-RM and muscular endurance tests on the bench and leg press, a Wingate anaerobic power test, and blood analysis to assess anabolic/catabolic status as well as markers of health. Data were analyzed using repeated measures ANOVA. Results indicated that ZMA supplementation non-significantly increased serum zinc levels by 11 - 17% (p = 0.12). However, no significant differences were observed between groups in anabolic or catabolic hormone status, body composition, 1-RM bench press and leg press, upper or lower body muscular endurance, or cycling anaerobic capacity. Results indicate that ZMA supplementation during training does not appear to enhance training adaptations in resistance trained populations.
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A ostatnio przetestowano (w niemczech) SNAC System’s ZMA za którym to suplem stoi niejaki pan Victor Conte - inwentor ZMA!!!
I co wyszlo.....znow g**** heheheeheh
The team of researchers led by Wilhelm Schaenzer gave seven fitness fanatics the recommended dose of ZMA - three capsules per day, providing a total of thirty milligrams of zinc, 450 milligrams of magnesium and 11 milligrams of vitamin B6. The researchers made sure the athletes followed the advice of the manufacturer. The participants were asked to swallow the capsules with water between dinner and bedtime at minimum 1 h after the last food intake. Seven other athletes were given a placebo.
The Germans then monitored the concentration of androgens in the blood their subjects for 56 days.
When the researchers measured the concentrations of a series of natural androgens in the test subjects' urine the story was pretty much the same. The concentrations are listed in the table, but not in straightforward milligrams, as the figures have undergone statistical processing. But the message is clear. ZMA does not raise the androgen level. If anything, it appears to lower it a little.
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Czy zma (lub lepiej sam cynk) moze pomoc podniesc tescia do maxymalnej naturalnej normy czlowieka? Tak jesli macie w diecie jego niedobór...
Prasad AS, Mantzoros CS, Beck FW, Hess JW, Brewer GJ.
Department of Internal Medicine, Wayne State University School of Medicine, Detroit, Michigan, USA.
Zinc deficiency is prevalent throughout the world, including the USA. Severe and moderate deficiency of zinc is associated with hypogonadism in men. However, the effect of marginal zinc deficiency on serum testosterone concentration is not known. We studied the relationship between cellular zinc concentrations and serum testosterone cross-sectionally in 40 normal men, 20 to 80 y of age. In four normal young men (27.5 +/- 0.5 y), we measured serum testosterone before and during marginal zinc deficiency induced by restricting dietary zinc intake. We also measured serum testosterone in nine elderly men (64 +/- 9 y) who were marginally zinc deficient before and after 3 to 6 mo of supplementation with 459 mumol/ d oral zinc administered as zinc gluconate. Serum testosterone concentrations were significantly correlated with cellular zinc concentrations in the cross-sectional study (lymphocyte zinc versus serum testosterone, r = 0.43, p = 0.006; granulocyte zinc versus serum testosterone, r = 0.30, p = 0.03). Dietary zinc restriction in normal young men was associated with a significant decrease in serum testosterone concentrations after 20 weeks of zinc restriction (baseline versus post-zinc restriction mean +/- SD, 39.9 +/- 7.1 versus 10.6 +/- 3.6 nmol/L, respectively; p = 0.005). Zinc supplementation of marginally zinc-deficient normal elderly men for six months resulted in an increase in serum testosterone from 8.3 +/- 6.3 to 16.0 +/- 4.4 nmol/L (p = 0.02). We conclude that zinc may play an important role in modulating serum testosterone levels in normal men.
Jestem otwarty na dyskusje obroncow zma (ps tyko nie wklejajcie artow z okladek supli zma eheheheheheh)
".... Then we'll see which are better, his steroids or mine"