Posted Dec 23, 2011
Sports physiologists know that maximizing muscle building requires adequate amounts of high-quality dietary protein—rich in branched-chain amino acids such as leucine—and a resistance training regimen such as weight lifting. Less known are the precise cellular and molecular signals that explain how these factors promote muscle growth.
A new study from New Zealand and Australian scientists reports that leucine-rich whey protein combined with resistance exercise stimulates muscle growth in young and older men by way of increasing the activation of molecular modification (mTOR signaling) of muscle proteins. Interestingly, while the combination of exercise and whey protein increased activation of some muscle proteins to a similar degree in young and old before training, the diet/exercise combination was distinctly blunted in the older subjects.
According to the authors of the study, just published in the journal Applied Physiology, Nutrition and Metabolism, while exercise and whey protein combined to effectively activate muscle proteins in young men, deficiencies in this signaling pathway were evident in muscles from older individuals. Continue reading →
source: http://www.isagenixhealth.net/2011/12/how-does-whey-protein-signal-muscle-growth/