Nutrimuscle Forum : Mobile & Tablette

Plus de résultats pour moins d'entraînement grâce à la Whey

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

Modérateurs: Nutrimuscle-Conseils, Nutrimuscle-Diététique

Plus de résultats pour moins d'entraînement grâce à la Whey

Messagepar Nutrimuscle-Conseils » 7 Jan 2010 23:53

Effects Of Resistance Training Volume And Whey Protein Supplementation On Lower-Body Strength And Muscle Cross-Sectional Area.
Journal of Strength & Conditioning Research. 24 Supplement 1:1, January 2010.
Walter, Ashley; Hoge, Katherine M; Herda, Trent J; Costa, Pablo B; Ryan, Eric D; Stout, Jeffrey R FNSCA; Cramer, Joel T FNSCA

Based on recent studies, it may be possible to use a reduced-volume resistance training program in conjunction with whey protein supplementation to achieve similar increases in strength and hypertrophy compared to traditional-volume resistance training without supplementation. To examine the effects of eight weeks of reduced-volume resistance training with whey protein supplementation versus traditional volume resistance training without supplementation on leg press strength (LPMAX) and thigh muscle cross-sectional area (mCSA) in collegeaged men. Twenty-two healthy, recreationally active men (mean +/- SD age: 21.5 +/- 3 yrs; height: 180 +/- 7.1 cm; weight: 81.6 +/- 13.8 kg) volunteered for LPMAX and mCSA testing before and after an 8-week resistance training intervention. LPMAX was determined using a standard one-repetition maximum (1-RM) protocol on a 45[degrees] hip sled, and mCSA at mid-thigh was assessed using a peripheral quantitative computed tomography scanner. Participants were randomly assigned to either the whey protein (WP) or control (idiot) group. The idiot group (n = 10) performed workouts with no supplementation 3 times per week at 80% of their LPMAX for 8 weeks, where week 1 consisted of 3 sets of 6 repetitions, week 2 was 4 sets of 6 repetitions, and weeks 3 - 8 were 5 sets of 6 repetitions. The WP group (n = 12) consumed a whey protein drink (20g polyethylene glycosylated whey protein concentrate, 7g leucine, and 200mg proteases) 30 minutes before and immediately after each training session and completed 1 set of 6 repetitions during week 1, 2 sets of 6 repetitions during week 2, and 3 sets of 6 repetitions during weeks 3 - 8. Resistance training volume was calculated as sets x repetitions x load (kg).

An independent-samples t-test indicated that the volume of the idiot group (mean +/- SD = 144,215 +/- 31,332) was 1.9 times greater than (p < 0.001) the volume of the WP group (75,552 +/- 17,362). The two-way ANOVAs indicated 28% (WP) and 22% (idiot) increases (p < 0.001) from pre- to post-training for LPMAX, while mCSA increased (p < 0.001) by 3.4% (WP) and 4.4% (idiot). However, there were no interactions (p > 0.05) and no differences (p > 0.05) between the WP and idiot groups at either pre- or post-training.

These findings suggested that resistance training with 48% less volume plus whey protein supplementation for 8 weeks resulted in similar increases in leg press strength and thigh mCSA as a higher-volume resistance training program with no supplementation. These results demonstrated the general importance of nutritional strategies (i.e., protein timing) in conjunction with resistance training for increasing muscle strength and size. These findings may be particularly useful when resistance training volume must remain low, such as during injury rehabilitation and in-season resistance training mesocycles.
Avatar de l’utilisateur
Nutrimuscle-Conseils
Forum Admin
 
Messages: 38838
Inscription: 11 Sep 2008 19:11

Messagepar pat g » 8 Jan 2010 09:06

je connais la PEG-créatine mais la PEG-whey ???
pat g
 
Messages: 390
Inscription: 4 Déc 2008 14:01
Localisation: Lyon

Messagepar pat g » 8 Jan 2010 09:13

Preliminary characterization of bovine beta-lactoglobulin after its conjugation to polyethylene glycol.
Nijs M, Azarkan M, Smolders N, Brygier J, Vincentelli J, Petiau-de Vries GM, Duchateau J, Looze Y.

Protein Chemistry Unit, Faculty of Medicine, University of Brussels, 808 Route de Lennik, B-1070 Bruxelles, Belgium.

The major component of the whey fraction of bovine milk, beta-lactoglobulin (betaLG), has been transformed by grafting polyethylene glycol chains either on the thiol group (free and after reduction of the S-S bridges) of the cysteine residues, or on the amino group of the lysine residues and/or of the N-terminal amino acid. Acylation of the protein was achieved at a controlled pH of 7.0 using increasing ratios of activated PEG to betaLG. Transformation of the dimeric form into the monomer occurred at least for the fully pegylated adduct. The number of polymer chains fixed per mole of protein was determined by dosage of the free amino functions still present after reaction. The incidence of pegylation on the secondary structure of betaLG was evaluated using the Fourier Transform Infrared Spectroscopy (FTIR). Denaturation studies with guanidinium hydrochloride (Gu-HCl) by means of spectrofluorimetric measurements, showed an identical behavior of native as well as of pegylated betaLG.The antigenicity of the fully pegylated adduct was examined through antigenic competition towards native betaLG. The pegylated protein exhibited less than 1/100 of the native betaLG inhibition capacity, that could moreover never be complete. This is thus demonstrating the loss of accessibility for at least multiple conformational epitopes through pegylation procedure.Spectrofluorimetric measurements showed that betaLG-N-PEG(7) was still able to bind retinol while no effect on the intrinsic fluorescence could be detected by adding palmitic acid. Whether this last ligand binds or not to pegylated betaLG is discussed.


Bon si c'est le même principe, elle est incapable de se lié à des anticorps anti-protéine native. Donc peut on en conclure qu'elle est moins allergisante ?
pat g
 
Messages: 390
Inscription: 4 Déc 2008 14:01
Localisation: Lyon

Messagepar maximass » 8 Jan 2010 09:54

50 % de whey en plus peuvent donc augmenter les résultats si j'ai bien compris.
Je ne suis pas un chef en anglais donc je n'ai pas forcément tout compris à 100% mais je me posais une question:
Ce résultat est valable uniquement avec l'augmentation de whey dans cette étude.
Peut-on espèrer les mêmes résultat si on augmente la ration journalière de protéines de 50 % (viande, oeuf, whey ...) et donc non pas uniquement la whey comme dans cette étude?
Avatar de l’utilisateur
maximass
 
Messages: 203
Inscription: 25 Mai 2009 10:33

Messagepar pat g » 8 Jan 2010 10:24

These results demonstrated the general importance of nutritional strategies (i.e., protein timing) in conjunction with resistance training for increasing muscle strength and size.

Je ne pense pas, maximass, comme il parlent de protein timing, à mon avis cela reflete leur stratégie de prise avant et après l'entrainement, comme indiqué dans leur étude.
pat g
 
Messages: 390
Inscription: 4 Déc 2008 14:01
Localisation: Lyon

Messagepar maximass » 8 Jan 2010 10:38

pat g a écrit:These results demonstrated the general importance of nutritional strategies (i.e., protein timing) in conjunction with resistance training for increasing muscle strength and size.

Je ne pense pas, maximass, comme il parlent de protein timing, à mon avis cela reflete leur stratégie de prise avant et après l'entrainement, comme indiqué dans leur étude.

ok merci mais étonnant car la whey n'est pas recommandée en pré entrainement pourtant vu l'effet hypoglycémiant!
Avatar de l’utilisateur
maximass
 
Messages: 203
Inscription: 25 Mai 2009 10:33

Messagepar Nutrimuscle-Conseils » 8 Jan 2010 11:33

c'est surtout l'isolat
Avatar de l’utilisateur
Nutrimuscle-Conseils
Forum Admin
 
Messages: 38838
Inscription: 11 Sep 2008 19:11

Messagepar maximass » 8 Jan 2010 12:21

Nutrimuscle-Conseil a écrit:c'est surtout l'isolat

ah ok donc pas de souci avec une whey de base ou une whey bio?
Quel est le meilleur délai pour la prise dans ce cas en pré training?
Souvent, je voyais conseiller des prot plus lentes du style protéines totales ou certains prenaient par exemple du pepto pro peu de temps avant le début de l'entrainement.

Eviter un isolat donc avant ou musclewhey 4 avant qui en contient également?

Merci, j'irai me coucher moins bête ce soir.
Avatar de l’utilisateur
maximass
 
Messages: 203
Inscription: 25 Mai 2009 10:33


Retourner vers Actualités, vidéos, études scientifiques

Qui est en ligne

Utilisateurs parcourant ce forum: Google [Bot] et 2 invités