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Whey Protein

Proteína do Soro do Leite
A diminuição da massa muscular está associada à idade e à inatividade física. Exercícios físicos, principalmente os resistidos com peso, como a musculação, são de extrema importância para impedir a atrofia e favorecer o processo de hipertrofia muscular. A ingestão de proteínas pós-treino favorece a recuperação e a síntese proteica muscular.

Hoje, o Whey Protein  é o suplemento alimentar mais famoso do mundo, tomado por atletas de todos os níveis, desde atletas de academia até fisiculturistas.

O Whey Protein é um suplemento composto em maior parte pela proteína derivada do soro do leite, extraído durante o processo de fabricação do queijo. Sendo a segunda maior fonte proteica vinda do leite de vaca, cerca de 20%, sendo o restante a caseína.

O produto pode ser encontrado em diversas formas como pó ou barrinhas. Existem diferentes composições do suplemento, que variam de acordo com a proporção de proteína, carboidratos e gordura.

Whey Protein Powder: contém os níveis de proteína, lactose e gordura do leite de origem;

Whey Protein Concentrado: possui maior valor biológico, ativando as proteínas, possui redução de lactose;

Whey Protein Isolado: é a mais pura forma proteica com 90%. A lactose e gordura são removidas.

Whey Protein Hidrolisado significa (basicamente) que a proteína foi parcialmente desintegrada em péptidos de diferentes comprimentos.

Confira a tabela abaixo com a composição de cada tipo de proteína:

Componente         Whey Powder    Whey Concentrado      Whey Isolado

Proteína                     11 – 14,5%             25-89%                       +90%

Lactose                       63 – 75%              10 -55%                        0,5%

Gordura do leite        1 – 1,5%                2 – 10%                       0,5%

Pode-se destacar que os aminoácidos presentes na proteína do soro do leite é muito similar ao das proteínas do músculo esquelético, fornecendo quase todos os aminoácidos em proporção similar ao mesmo, classificando-os como um efetivo suplemento anabólico, crescimento.

Os aminoácidos presentes na proteína do soro do leite são: alanina, arginina, asparagina, ácido aspártico, cisteína, glutamina, ácido glutâmico, glicina, histidina, isoleucina, leucina, lisina, metionina, fenilalanina, prolina, serina, treonina, triptofano, tirosina e valina. Sendo a Leucina de maior impacto quando o assunto é ganho de massa muscular.

Alguns estudos demonstram que o Whey Protein estimula 68% da síntese proteica, sendo este processo de uma forma mais rápida que as demais proteínas, porém também sofre uma oxidação maior, pois se torna uma forma combustível para este processo.

O whey protein pode ser vendido, comprado e consumido muito em qualquer ambiente. Essa facilidade faz com que muitos indivíduos usem o suplemento sem saber se de fato precisam dele, qual a quantidade ideal para o seu organismo e se possuem condições de saúde para suportar essa sobrecarga de proteína. Portanto, vale consultar um nutricionista para verificar se, em seu caso, o Whey Protein se encaixaria na sua alimentação.

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Nathália Espin

Nathália Espin, 23 anos, formada em Nutrição e pós-graduada em Bases Nutricionais do Esporte – Nutrição Esportiva. Atua na área de Nutrição Clínica com esportistas e atletas de diversas modalidades, além de crianças, obesos, gestantes, idosos, ou seja, todos aqueles que buscam melhora na qualidade de vida. Apaixonada pelas incríveis transformações que uma boa alimentação é capaz de fazer na saúde, mente e corpo. Email: nutri.espin@gmail.com Instagram: @nutriespin

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