needtogetaas
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Re: Botanicals,minerals,nutraceuticals,probiotics,vita mins,amino acids. So many out
Casein
, a tasteless, odorless protein precipitated from milk by rennin, is another beneficial protein source. As it may improve cardiovascular training, decrease epididymal fat tissue and increase lean body mass,15 casein may promote positive results in resistance training programs. Casein produces similar increases as whey protein in muscle protein net balance and synthesis, despite different patterns of serum amino acid responses between the two ingredients.16 However, clinical trials comparing the efficacy of the two compounds have shown mixed results with regard to lean body mass and muscle glycogen uptake. One such trial, a randomized, prospective 12-week study on overweight policemen conducted at Brigham and Women’s Hospital in Boston, compared changes in body composition produced by supplementation with casein or whey hydrolysate plus exercise and a hypocaloric diet, and found test subjects supplemented with casein experienced greater gains in strength and lean body mass than individuals given whey.17 The researchers concluded the disparity in results between groups was likely due to improved nitrogen retention and overall anti-catabolic effects produced by specific peptide components of the casein hydrolysate. Conversely, a Japanese study found whey protein superior to casein in promoting glycogen uptake in skeletal muscle of exercise-trained rats.18
Casein has also shown better results than soy protein on lean muscle mass in a handful of clinical trials. One such study, completed at Maastricht University, the Netherlands, compared the efficacy of casein and soy protein with regard to the ingredients’ metabolic effects in healthy human subjects and found casein produced greater net protein synthesis in test subjects than soy; in addition, a significantly larger portion of soy protein than casein was degraded to toxic urea within the body.19 Similarly, another study out of Maastricht University measuring net protein retention and amino acid and urea kinetics in gut, liver and muscle of pigs given casein or soy found casein promoted greater net protein synthesis than did soy, while soy protein produced higher levels of urea.20
Beyond compound protein sources, athletes often supplement with isolated amino acids to support their training regimens. Glutamine, the most abundant amino acid in the body, is converted to glucose during exertion, providing fuel for the musculoskeletal and immune systems. Several clinical trials have shown supplemental glutamine may decrease incidence of illness in endurance athletes who incur increased risk of infection caused by rigorous, prolonged exercise.21,22,23 A study on glutamine supplementation among middledistance, marathon and ultra-marathon runners, elite rowers and sedentary controls showed glutamine intake following exhaustive exercise appeared to reduce the incidence of subsequent infections.24 The researchers noted the ratio of T-helper and T-suppressor cells appeared to be elevated in those who received glutamine, compared with placebo.
Arginine
, another amino acid valued by athletes, possibly increases endurance,25 increases skeletal muscle glucose clearance26 and facilitates increased anaerobic work capacity and muscle mass brought by resistance training.27 In addition, arginine may reduce levels of exercise-induced waste products in blood.28 In a French clinical trial on eight healthy individuals exercising at maximum capacity, supplemental arginine significantly reduced peak levels of ammonia and lactate in test subjects’ plasma.29 Arginine also reduced serum levels of exercise-related toxins in a Taiwanese study on rats subjected to a treadmill challenge.30 In the randomized clinical trial, animals supplemented with arginine had lower plasma levels of toxins including cardiac xanthine oxidase, malondialdehyde, creatinine kinase and lactate dehydrogenase following exercise, in comparison with rats subjected to exercise and not given supplemental arginine; the researchers concluded arginine supplementation reduces oxidative damage and myocardial inflammation caused by exhaustive exercise in rats.
Carnitine
, an amino acid metabolite synthesized within the body from the amino acids lysine and methionine, is beneficial to athletes as it supplies mitochondria, (cellular energy producers) with fatty acids for energy production,31 thereby enhancing muscle fatty acid oxidation. In addition, carnitine beneficially alters glucose homeostasis, increases acetylcarnitine production, positively modifies muscular response to training and increases resistance to muscle fatigue.32 Studies have shown supplemental carnitine optimizes training, competition and recovery from strenuous exercise33 through mechanisms including reduction of toxin accumulation in plasma,34,35 inhibition of exercise-related fatigue36 and promotion of muscle recovery.37,38 Supplemental carnitine may also improve body composition; in one controlled horse study held at the University of Cordoba in Spain, supplementation of horses with carnitine improved muscular adaptations to training, including increased percentage of type IIA muscle fibers, increased capillary-to-fiber ratio and increased muscle glycogen content.39 In other trials demonstrating carnitine’s benefits to muscle mass, supplementation with L-carnitine L-tartrate (as L-Carnipure®, from Lonza) increased fat oxidation and spared lean body mass in 12 slightly overweight subjects who received a regular diet with or without 3 g/d of the compound for 10 days40 and enhanced fat utilization in 14 physically active males who underwent bouts of steady-state cycling during eight weeks of supplementation with carnitine (as L-Carnipure).41
Casein
, a tasteless, odorless protein precipitated from milk by rennin, is another beneficial protein source. As it may improve cardiovascular training, decrease epididymal fat tissue and increase lean body mass,15 casein may promote positive results in resistance training programs. Casein produces similar increases as whey protein in muscle protein net balance and synthesis, despite different patterns of serum amino acid responses between the two ingredients.16 However, clinical trials comparing the efficacy of the two compounds have shown mixed results with regard to lean body mass and muscle glycogen uptake. One such trial, a randomized, prospective 12-week study on overweight policemen conducted at Brigham and Women’s Hospital in Boston, compared changes in body composition produced by supplementation with casein or whey hydrolysate plus exercise and a hypocaloric diet, and found test subjects supplemented with casein experienced greater gains in strength and lean body mass than individuals given whey.17 The researchers concluded the disparity in results between groups was likely due to improved nitrogen retention and overall anti-catabolic effects produced by specific peptide components of the casein hydrolysate. Conversely, a Japanese study found whey protein superior to casein in promoting glycogen uptake in skeletal muscle of exercise-trained rats.18
Casein has also shown better results than soy protein on lean muscle mass in a handful of clinical trials. One such study, completed at Maastricht University, the Netherlands, compared the efficacy of casein and soy protein with regard to the ingredients’ metabolic effects in healthy human subjects and found casein produced greater net protein synthesis in test subjects than soy; in addition, a significantly larger portion of soy protein than casein was degraded to toxic urea within the body.19 Similarly, another study out of Maastricht University measuring net protein retention and amino acid and urea kinetics in gut, liver and muscle of pigs given casein or soy found casein promoted greater net protein synthesis than did soy, while soy protein produced higher levels of urea.20
Beyond compound protein sources, athletes often supplement with isolated amino acids to support their training regimens. Glutamine, the most abundant amino acid in the body, is converted to glucose during exertion, providing fuel for the musculoskeletal and immune systems. Several clinical trials have shown supplemental glutamine may decrease incidence of illness in endurance athletes who incur increased risk of infection caused by rigorous, prolonged exercise.21,22,23 A study on glutamine supplementation among middledistance, marathon and ultra-marathon runners, elite rowers and sedentary controls showed glutamine intake following exhaustive exercise appeared to reduce the incidence of subsequent infections.24 The researchers noted the ratio of T-helper and T-suppressor cells appeared to be elevated in those who received glutamine, compared with placebo.
Arginine
, another amino acid valued by athletes, possibly increases endurance,25 increases skeletal muscle glucose clearance26 and facilitates increased anaerobic work capacity and muscle mass brought by resistance training.27 In addition, arginine may reduce levels of exercise-induced waste products in blood.28 In a French clinical trial on eight healthy individuals exercising at maximum capacity, supplemental arginine significantly reduced peak levels of ammonia and lactate in test subjects’ plasma.29 Arginine also reduced serum levels of exercise-related toxins in a Taiwanese study on rats subjected to a treadmill challenge.30 In the randomized clinical trial, animals supplemented with arginine had lower plasma levels of toxins including cardiac xanthine oxidase, malondialdehyde, creatinine kinase and lactate dehydrogenase following exercise, in comparison with rats subjected to exercise and not given supplemental arginine; the researchers concluded arginine supplementation reduces oxidative damage and myocardial inflammation caused by exhaustive exercise in rats.
Carnitine
, an amino acid metabolite synthesized within the body from the amino acids lysine and methionine, is beneficial to athletes as it supplies mitochondria, (cellular energy producers) with fatty acids for energy production,31 thereby enhancing muscle fatty acid oxidation. In addition, carnitine beneficially alters glucose homeostasis, increases acetylcarnitine production, positively modifies muscular response to training and increases resistance to muscle fatigue.32 Studies have shown supplemental carnitine optimizes training, competition and recovery from strenuous exercise33 through mechanisms including reduction of toxin accumulation in plasma,34,35 inhibition of exercise-related fatigue36 and promotion of muscle recovery.37,38 Supplemental carnitine may also improve body composition; in one controlled horse study held at the University of Cordoba in Spain, supplementation of horses with carnitine improved muscular adaptations to training, including increased percentage of type IIA muscle fibers, increased capillary-to-fiber ratio and increased muscle glycogen content.39 In other trials demonstrating carnitine’s benefits to muscle mass, supplementation with L-carnitine L-tartrate (as L-Carnipure®, from Lonza) increased fat oxidation and spared lean body mass in 12 slightly overweight subjects who received a regular diet with or without 3 g/d of the compound for 10 days40 and enhanced fat utilization in 14 physically active males who underwent bouts of steady-state cycling during eight weeks of supplementation with carnitine (as L-Carnipure).41