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La protéine de pois: aussi efficace ou inefficace que la whey?

26/01/2015 | Etudes Compléments alimentaires


J’aime ce genre d’étude: vu qu’aucune des 2 protéines n’a eu d’effet, on peut en conclure que les pois sont aussi efficaces ou inefficaces que la whey: au choix!

Pea proteins oral supplementation promotes muscle thickness gains during resistance training:
a double-blind, randomized, Placebo-controlled clinical trial vs. Whey protein  
Nicolas Babault         Journal of the International Society of Sports Nutrition (2015) 12:3

The effects of protein supplementation on muscle thickness and strength seem largely dependent on
its composition. The current study aimed at comparing the impact of an oral supplementation with vegetable Pea
protein (NUTRALYS®) vs. Whey protein and Placebo on biceps brachii muscle thickness and strength after a 12-week
resistance training program.

One hundred and sixty one males, aged 18 to 35 years were enrolled in the study and underwent
12 weeks of resistance training on upper limb muscles. According to randomization, they were included in the Pea
protein (n = 53), Whey protein (n = 54) or Placebo (n = 54) group. All had to take 25 g of the proteins or placebo
twice a day during the 12-week training period. Tests were performed on biceps muscles at inclusion (D0), mid
(D42) and post training (D84). Muscle thickness was evaluated using ultrasonography, and strength was measured
on an isokinetic dynamometer.

Results showed a significant time effect for biceps brachii muscle thickness (P< 0.0001). Thickness
increased from 24.9 ± 3.8 mm to 26.9 ± 4.1 mm and 27.3 ± 4.4 mm at D0, D42 and D84, respectively, with only a
trend toward significant differences between groups (P= 0.09). Performing a sensitivity study on the weakest
participants (with regards to strength at inclusion), thickness increases were significantly different between groups
(+20.2 ± 12.3%, +15.6 ± 13.5% and +8.6 ± 7.3% for Pea, Whey and Placebo, respectively;
P< 0.05). Increases in thickness were significantly greater in the Pea group as compared to Placebo whereas there was no difference
between Whey and the two other conditions. Muscle strength also increased with time with no statistical
difference between groups.

In addition to an appropriate training, the supplementation with pea protein promoted a greater
increase of muscle thickness as compared to Placebo and especially for people starting or returning to a muscular
strengthening. Since no difference was obtained between the two protein groups, vegetable pea proteins could be
used as an alternative to Whey-based dietary products.

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