Nutrimuscle Forum : Mobile & Tablette

L'isolat de whey reste plus anabolique que la protéine total

Actualités sport, fitness & musculation, vidéos des pros, études scientifiques. Discutez avec la communauté Nutrimuscle et partagez votre expérience...

Modérateurs: Nutrimuscle-Conseils, Nutrimuscle-Diététique

L'isolat de whey reste plus anabolique que la protéine total

Messagepar Nutrimuscle-Conseils » 29 Fév 2012 03:45

Greater stimulation of myofibrillar protein synthesis with ingestion of whey protein isolate v. micellar casein at rest and after resistance exercise in elderly men.
Br J Nutr. 2012 Jan 31:1-5. Burd NA, Yang Y, Moore DR, Tang JE, Tarnopolsky MA, Phillips SM.

We aimed to determine the effect of consuming pure isolated micellar casein or pure whey protein isolate on rates of myofibrillar protein synthesis (MPS) at rest and after resistance exercise in elderly men. Healthy elderly men (72 (sem 1) years; BMI 26·4 (sem 0·7) kg/m2) were divided into two groups (n 7 each) who received a primed, constant infusion of l-[ring-13C6]phenylalanine to measure MPS at rest and during 4 h of exercise recovery. Participants performed unilateral leg resistance exercise followed by the consumption of isonitrogenous quantities (20 g) of casein or whey. Blood essential amino acids and leucine concentration peaked 60 min post-drink and were greater in amplitude after whey protein ingestion (both, P < 0·05).

MPS in the rested leg was 65 % higher (P = 0·002) after ingestion of whey (0·040 (sem 0·003) %/h) when compared with micellar casein (0·024 (sem 0·002) %/h).

Similarly, resistance exercise-stimulated rates of MPS were greater (P < 0·001) after whey ingestion (0·059 (sem 0·005) %/h) v. micellar casein (0·035 (sem 0·002) %/h).

We conclude that ingestion of isolated whey protein supports greater rates of MPS than micellar casein both at rest and after resistance exercise in healthy elderly men. This result is probably related to a greater hyperaminoacidaemia or leucinaemia with whey ingestion.
Avatar de l’utilisateur
Nutrimuscle-Conseils
Forum Admin
 
Messages: 38839
Inscription: 11 Sep 2008 19:11

Messagepar Monsieur Gerbille » 29 Fév 2012 09:59

Le fait que l'etude porte sur des personnes agees a t-elle une incidence par rapport a des sportifs d'une trentaine d'annee ?
Avatar de l’utilisateur
Monsieur Gerbille
 
Messages: 20
Inscription: 22 Fév 2012 19:35
Localisation: Nantes

Messagepar Nutrimuscle-Conseils » 29 Fév 2012 10:33

la différence serait peut-être moindre mais la tendance resterait la même
Avatar de l’utilisateur
Nutrimuscle-Conseils
Forum Admin
 
Messages: 38839
Inscription: 11 Sep 2008 19:11

Messagepar Monsieur Gerbille » 29 Fév 2012 10:53

Interessant !
Avatar de l’utilisateur
Monsieur Gerbille
 
Messages: 20
Inscription: 22 Fév 2012 19:35
Localisation: Nantes


Retourner vers Actualités, vidéos, études scientifiques

Qui est en ligne

Utilisateurs parcourant ce forum: Aucun utilisateur enregistré et 2 invités