Definition: "An ergogenic aid is any substance or phenomenon that enhances performance "
|
|
||||||||
25.08.2012 |
|
HMB reduces muscle breakdown in endurance athletes
The leucine metabolite HMB, which is available in almost every supplement store and web shop, protects endurance athletes' muscles if they have to run distances of 20 km or more. Sports scientists from Iowa State University wrote about the phenomenon some decades ago in the Journal of Applied Physiology.
How HMB works
Muscle cells use cholesterol for their membrane. They are unable to absorb cholesterol from the bloodstream, and thus have to rely on synthesising cholesterol themselves. The original theory of the makers of HMB is that HMB supplementation speeds up intramuscular cholesterol synthesis, which means that muscle cells are capable of repairing their damaged membranes more quickly after physical exertion.
Around 2010, that theory was replaced by another. Now researchers think that HMB works mainly by activating the classic anabolic signaling molecule mTOR.
Study
The researchers claim that the effects in the figures below are statistically significant. HMB decreases so muscle damage after the run and/or speeds up recovery.
Conclusion
In addition, many of the studies that are positive about the effects of HMB come from scientists who are not entirely unbiased when it comes to promoting the substance. This study is one of those.
Source:
More: Archives:
|
|