Definition: "An ergogenic aid is any substance or phenomenon that enhances performance "
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12.11.2008 |
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Flu shot lowers testosterone level
If your immune system has to learn a new trick, your testosterone level goes down. This is also what happens if you get vaccinated against a virus, researchers at the University of California in Santa Barbara discovered. Students who were given a flu jab had slightly reduced testosterone levels for about two weeks after having the shot.
Testosterone
But the immune system needs energy as well. The learning part of the immune system is continuously scanning for new intruders, and when it finds them it activates a category of cells that can fight the intruders. This costs energy. A high androgen level is bad for the immune system because androgens rob the immune system of energy.
This is why we only make limited amounts of androgen naturally. Evolution has not been kind to individuals that make excessively high amounts of androgens.
That's the theory at least. But does it hold water?
Study
A flu vaccine contains an inactivated pathogen, which does not make the body really ill, but stimulates the immune system to start producing a new type of immune cells. This enables the person to fight the disease if they are exposed to the real virus. Vaccinations give the immune system a crash course, which costs the body less energy than fighting an infection from the original pathogen would do.
Results
Conclusion
"The present results suggest that pathogen exposure can cause a decline in testosterone, presumably as a means of prioritizing energy investment away from mating effort and into immune responses", they write.
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