Glutamate-arginine salts and hormonal responses to exercise.

AbstractHormonal changes during exercise is of growing interest because of their role in adaptation, and performance. The production of amino acids (AA) due to the degradation of muscle protein increases during exercise and some AA may be utilized for energy expenditure or as hormonal secretogogues. Thus, one can propose a strategy to reduce muscle protein breakdown and regulate hormones involved in energy metabolism by dietary AA supplementation.We assessed the effects of glutamate-arginine salt (AGs) ingestion on exercise-induced hormonal alterations in highly trained cyclists (age 18-22 yrs). Using an indwelling catheter, we collected multiple blood samples at rest, during warm up, during and after an intense exercise session. Plasma growth hormone (hGH), insulin and Cortisol were measured by radioimmunoassay.As reported in previous studies, we observed a marked increase in plasma hGH and Cortisol levels during and after exercise in the placebo (Pl) condition as well as a slight decrease in insulin con...