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Definition: "An ergogenic aid is any substance or phenomenon that enhances performance "
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19.12.2012 |
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NO boosters are myostatin inhibitors
Bodybuilding supplements that boost the concentration of nitrogen monoxide - NO for short - in the muscles are probably also myostatin inhibitors. This emerged from an in-vitro study done at the Stem Cell Research Institute in Milan, which was published in the Journal of Cell Biology. [This study has been retracted - red.]
In the Italian study here, the researchers extracted muscle cells from mice embryos and exposed them in test tubes to DETA-NO, an NO donor, and L-NAME, a compound that inhibits the formation of NO.
The researchers discovered that exposure to the NO-donor stimulated satellite cells – young muscle cells that are not yet part of the muscle fibres – to take up their position in the muscle tissue. DETA-NO boosted the cells' fusion index; L-NAME reduced it.
NT = cells that were not treated.
The NO booster worked via the cellular messenger molecule cGMP, the Italians discovered. If they deactivated cGMP with the inhibitor ODQ, then DETA-NO did nothing. If they added 8Br-cGMP, a substance that imitates the effect of cGMP, then the effect of the NO donor on the muscle cells became greater.
The figures below give an idea of the way in which the NO donor works: the substance boosts the production of follistatin in different sorts of muscle cells, and thus inhibits the production of myostatin.
If you combine these substances with an NO donor, they may well work better. And if you're stacking anyway: creatine is a myostatin inhibitor...
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