Researchers sought to find out if whey protein could improve cognitive performance under stress.
Study, they found a significantly greater increase in the plasma trp-LNAA ratio after consumption of whey rather than after casein (the control). Most interesting was a significant improvement in memory test performance observed only in the stress-vulnerable subjects. Worthy of note is the fact that participants who were not vulnerable to stress did not show an improvement in memory. These findings show that those prone to stress may benefit greatly from the use of whey protein and other nutrients known to raise serotonin levels.
The researchers concluded after one study involving subjects under acute stress, that the "Consumption of a dietary protein enriched in tryptophan increased the plasma Trp-LNAA (large neutral amino acids) ratio and, in stress-vulnerable subjects, improved coping ability, probably through alterations in brain serotonin."
Cognitive performance declines under chronic stress and it is theorized that the effect of chronic stress on performance may be partially due to reduced brain serotonin levels. As this study found, whey increased serotonin levels by dramatically increasing tryptophan levels. Tryptophan is an amino acid that is the direct precursor to serotonin.
Study looked directly at the effects of different pre-workout drinks on muscle mass and body fat. The study came to some very interesting conclusions. The composition of the pre-exercise meal does affect substrate utilization during exercise and thus might affect long-term changes in body weight and composition. That is, what you eat before you work out can dictate what you use for energy which alters what you burn for energy.
The researchers took groups of rats and made them exercise two hours daily for over five weeks, either in the fasted state or one hour after they ingested a meal enriched with a simple sugar , whole milk protein or whey protein.
Last edited by Nutrishop Indiasupplement; 07-14-2011 at 01:50 PM.
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