Quote (xGeArz @ Aug 28 2011 09:38pm)
Res Sports Med. 2006 Oct-Dec;14(4):289-99.
Yohimbine: the effects on body composition and exercise performance in soccer players.
Ostojic SM.
Institute of Sports Medicine, Sports Academy, Belgrade, Serbia and Montenegro. sergej@panet.co.yu
The main aim of this study was to determine the effects of yohimbine supplementation on body composition and exercise performance in professional soccer players. The athletes (20 top-level male soccer players) were allocated to two randomly assigned trials. Subjects in the yohimbine group orally ingested tablets that contains yohimbine at a dose of 20 milligrams per day in two equal doses for 21 days. Subjects in the placebo group ingested an equal number of identical-looking pills that contained cellulose. There were no statistically significant changes in body mass and muscle mass within or between trials (p > 0.05) after the supplementation protocol. Percentage of body fat significantly decreased in the yohimbine group after the supplementation protocol (9.3 +/- 1.1 vs. 7.1 +/- 2.2%; p < 0.05). Furthermore, fat mass was significantly lower in the yohimbine versus placebo trial at postsupplementation assessment (7.1 +/- 2.2 vs. 9.2 +/- 1.9%; p < 0.05). There were no changes in exercise performance indicators (bench and leg press, vertical jump, dribble and power test results, shuttle run) within or between. trials (p > 0.05). No subject reported any side effects from yohimbine. The results of the current study indicate that supplementation with yohimbine combined with resistance training does not significantly alter the body mass, muscle mass, or performance indicators in professional soccer players. Nonetheless, yohimbine supplementation appears to be suitable as a fat loss strategy in elite athletes.
PMID: 17214405 [PubMed - indexed for MEDLINE]
Interesting, however the source is unfortunately not quite credible enough to source in my opinion.
Consider that MANY "studies" that are conducted in the former eastern bloc tend to be falsified for profitable gains. I would not at all be swayed by such a study. If you can find a legitimate study conducted in the US/EU with full backing and certification, I would definitely be happy to have a look at it.
edit:
also I just looked at those numbers again...(9.3 +/- 1.1 vs. 7.1 +/- 2.2%; p < 0.05)
In a 21 day study, 9.3 vs 7.1 would mean a 2.2% body fat loss which is STAGGERING for a matter for 21 days with bf% already so low.
Furthermore, the 2.2% margin with the yohembine group is double the % of the placebo group. Which if all the stars align just right, 9.3 becomes 8.2 and 7.1 becomes 9.3. This is obviously far fetched, however within reason I would except that their fat % ranges did not really differ. This study might have been conducted in a scientific environment but skewed just enough to produce the data that they wanted in order to benefit a supplement company (just a hypothesis)
This post was edited by SKCRaynor on Aug 28 2011 10:35pm