Comprovado cientificamente: ZMA não funciona.

[zicado]

Segue na íntegra a matéria da revista "Muscle Development" de abril de 2009.

ZMA Has No Effect On Testosterone

Many bodybuilders take ZMA

because they believe it increases

testosterone levels and might be a

‘drug-free’ method of boosting muscle

growth. ZMA contains zinc, vitamin B-

6 and magnesium. Zinc is involved in

testosterone metabolism. In the 1960s,

scientists found that men with low

levels of zinc also had low testos-

terone levels. In 2000, Brill and Conti

found that ZMA increased testos-

terone levels by 30 percent in athletes.

This study made ZMA an overnight

sensation. Subsequent studies showed

that zinc supplements did not increase

testosterone levels in people with nor-

mal blood levels of zinc. A study con-

ducted at the German Research

Center of Elite Sport in Cologne,

Germany found that ZMA supple-

ments had no effect on blood levels of

total testosterone or the biologically

active free testosterone. Subjects took

three ZMA capsules per day (30

mg of zinc per dose) for 58

days. While the supplements

increased blood zinc levels,

they had no effect on testos-

terone. (European Journal of

Clinical Nutrition, 63: 65-70,

2009

A parte importante é: " While the supplements

increased blood zinc levels,

they had no effect on testos-

terone." (Enquanto os suplementos aumentaram o nivel de zinco no sangue, não houve mudanças no nivel de testosterona.)

Fiquem de olho ...

[----]

Segue na íntegra a matéria da revista "Muscle Development" de abril de 2009.

ZMA Has No Effect On Testosterone

Many bodybuilders take ZMA

because they believe it increases

testosterone levels and might be a

‘drug-free’ method of boosting muscle

growth. ZMA contains zinc, vitamin B-

6 and magnesium. Zinc is involved in

testosterone metabolism. In the 1960s,

scientists found that men with low

levels of zinc also had low testos-

terone levels. In 2000, Brill and Conti

found that ZMA increased testos-

terone levels by 30 percent in athletes.

This study made ZMA an overnight

sensation. Subsequent studies showed

that zinc supplements did not increase

testosterone levels in people with nor-

mal blood levels of zinc. A study con-

ducted at the German Research

Center of Elite Sport in Cologne,

Germany found that ZMA supple-

ments had no effect on blood levels of

total testosterone or the biologically

active free testosterone. Subjects took

three ZMA capsules per day (30

mg of zinc per dose) for 58

days. While the supplements

increased blood zinc levels,

they had no effect on testos-

terone. (European Journal of

Clinical Nutrition, 63: 65-70,

2009

A parte importante é: " While the supplements

increased blood zinc levels,

they had no effect on testos-

terone." (Enquanto os suplementos aumentaram o nivel de zinco no sangue, não houve mudanças no nivel de testosterona.)

Fiquem de olho ...

Usei o ZMA da Universal por 2 semanas... Senti que ele me inchou um pouco no começo; parecia que com pesos menores eu inchava mais, mas num malhava direito... Daí parei; só fiquei com CREA+Glutamina+Malto+Whey; o que foi bem melhor.

[Visitante]

Eu sempre soube que ZMA não era pra testosterona. Eu uso ZMA pra dormir melhor, já que a gente não tem acesso à melatonina e restaurar os níveis de zinco e magnésio no organismo, depois do estresse do treino. Tem estudos muito mais antigos que esse que dizem a mesma coisa, publicados no PubMed

[Visitante noxerdf]

Será?

Tem link disso ai...?

[Visitante]

Será?

Tem link disso ai...?

Estudo de 2004:

http://www.jissn.com/content/1/2/12

Training Adaptations

ZMA supplementation has been purported to increase zinc and magnesium status, anabolic hormones, and promote greater gains in strength during training. In support of this contention, Brilla and Conte [13] reported that ZMA supplementation significantly increased free testosterone, IGF-1, and isokinetic strength gains during training. Results of this study do not support these findings. In this regard, ZMA supplementation had no significant effects on total and free testosterone, IGF-1, growth hormone, cortisol, the ratio of cortisol to testosterone, or muscle and liver enzymes in response to training. Moreover, no significant effects were observed between groups in changes in 1-RM strength, upper or lower body muscle endurance, or anaerobic sprint capacity. Interestingly, while some contend that ZMA supplementation may increase muscle mass during training, the Brilla and Conte [13] paper reported that ZMA supplementation had no effect on body mass changes during training. Results of the present study support these findings in that ZMA supplementation had no significant effects on body mass or DEXA determined body composition values. However, it should be noted that some potentially favorable trends were observed in fat free mass, fat mass, and body fat that deserve additional study.

[EMIPE]

Eu sempre soube que ZMA não era pra testosterona. Eu uso ZMA pra dormir melhor, já que a gente não tem acesso à melatonina e restaurar os níveis de zinco e magnésio no organismo, depois do estresse do treino. Tem estudos muito mais antigos que esse que dizem a mesma coisa, publicados no PubMed

Estou do seu lado.

É só acompanhar as reviews de usuários de ZMA lá fora. O pessoal toma p/ melhorar a qualidade do sono, ter sonhos mais reais e acordar mais "descansado"... Sabemos q durante o sono há liberação de hormônios e dormir bem é essencial p/ qualquer humano. ZMA e GABA são mt indicados p/ quem perde o sono com facilidade no meio da noite... Já com a melatonina, quem tem dificuldade em pegar no sono vai conseguir dormir mais rápido...

Abs,

MP