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Visa fullständig version : Vassleproteinhydrolysat och vassleprotein stimulerar proteinsyntesen lika effektivt


King Grub
2019-05-17, 09:35
BACKGROUND:

Muscle protein synthesis (MPS) can be stimulated by ingestion of protein sources, such as whey, casein, or soy. Protein supplementation can enhance muscle protein synthesis after exercise and may preserve skeletal muscle mass and function in aging adults. Therefore, identifying protein sources with higher anabolic potency is of high significance.

OBJECTIVE:

The aim of this study was to determine the anabolic potency and efficacy of a novel whey protein hydrolysate mixture (WPH) on mechanistic target of rapamycin complex 1 (mTORC1) signaling and skeletal MPS in healthy young subjects.

METHODS:

Ten young men (aged 28.7 ± 3.6 y, 25.2 ± 2.9 kg/m2 body mass index [BMI]) were recruited into a double-blind two-way crossover trial. Subjects were randomized to receive either 0.08 g/kg of body weight (BW) of WPH or an intact whey protein (WHEY) mixture during stable isotope infusion experiments. Fractional synthetic rate, leucine and phenylalanine kinetics, and markers of amino acid sensing were assessed as primary outcomes before and 1-3 h after protein ingestion using a repeated measures mixed model.

RESULTS:

Blood leucine concentration, delivery of leucine to muscle, transport of leucine from blood into muscle and intracellular muscle leucine concentration significantly increased to a similar extent 1 h after ingestion of both mixtures (P < 0.05). Phosphorylation of S6K1 (i.e. a marker of mTORC1 activation) increased equally by ∼20% 1-h postingestion (P < 0.05). Ingestion of WPH and WHEY increased mixed MPS similarly in both groups by ∼43% (P < 0.05); however, phenylalanine utilization for synthesis increased in both treatments 1-h postingestion but remained elevated 3-h postingestion only in the WPH group (P < 0.05).

CONCLUSIONS:

We conclude that a small dose of WPH effectively increases leucine transport into muscle, activating mTORC1 and stimulating MPS in young men. WPH anabolic potency and efficacy for promoting overall muscle protein anabolism is similar to WHEY, an intact protein source.

J Nutr. 2019 May 16. Whey Protein Hydrolysate Increases Amino Acid Uptake, mTORC1 Signaling, and Protein Synthesis in Skeletal Muscle of Healthy Young Men in a Randomized Crossover Trial.

LunaSpice
2019-05-17, 10:22
Spara åtskilliga hundralappar varje månad mao. Nice.

Ola Wallengren
2019-05-17, 13:57
Intressant här är att de ökade proteinsyntesen med hela 43% i vila med bara 6g vassleprotein. Däremot var proteinbalansen inte positiv i mer än ca 15 min, vilket visar att dosen var allt för låg. I och för sig kan man tänka sig att det är vid relativt låga doser som skillnader mellan olika proteinkällor kan ses tydligast. De gjorde ingen powerberäkning på proteinsyntesen, och hade de gjort det hade man högst sannolikt kommit fram till att man hade för litet sample för att uppmäta även högt förväntade skillnader mellan vasslesorterna.