-by Dott.Andrea Rizzo-


La L-carnitina migliora l’assorbimento nel tessuto muscolare del testosterone o altri androgeni dopo un allenamento intenso. L’effetto è leggero, ma secondo gli scienziati dello sport presso l’Università del Connecticut, spiegano che può essere abbastanza intenso per ottenere grandi guadagni in potenza e costruzione muscolare grazie ad allenamenti per la forza.
La L-carnitina stimola l’incremento del numero di recettori per gli androgeni. Inoltre la carnitina stimola anche la produzione di LH e di conseguenza quella del testosterone.


Carnitine plus a meal boosts post-workout testosterone uptake

L-carnitine boosts the uptake in muscle tissue of testosterone or other androgens after intensive training. The effect is subtle, but according to sports scientists at the University of Connecticut, it may be big enough to achieve bigger gains in muscle power and mass from strength training.
In 2006 the researchers published the results of an experiment they carried out with 10 experienced male strength trainers. The men trained their most important muscle groups by doing squats, bench press, bent-over rows and shoulder press. They did 4 sets of 10 reps for each exercise. The subjects trained in the mornings before breakfast. On one occasion they drank water after their training session, on the other they consumed a meal substitute, which provided 8 kcal per kg bodyweight. This contained 1.1 g carbohydrates, 0.3 g whole protein and 0.25 g fat. On top of that the researchers gave the men 2 g L-carnitine daily in the form of L-carnitine-L-tartrate [divided into two portions per day]. The supplement was given for a period of 3 weeks. Carnitine tartrate is believed to be more stable in the body than ordinary carnitine. On another occasion the men were given a placebo. When the researchers examined muscle cells from the men’s legs, they noticed that the carnitine supplementation had raised the manufacture of androgen receptors.
Eating a meal after the training session also increased the number of androgen receptors, but the effect was stronger when the men took carnitine as well.
The increased activity of the androgen receptors as a result of the meal plus supplement led to a significant decrease in the amount of bioavailable testosterone. The post-workout meal led to an increase in the production of LH after the training session. LH induces the testes to secrete testosterone. The effect was stronger when the men also took carnitine. Carnitine has become a forgotten supplement, and unjustly so. This maybe because researchers didn’t realise that carnitine needs carbohydrates to be able to enter muscle cells.

Source: Med Sci Sports Exerc. 2006 Jul; 38(7): 1288-96