Post by Neversatisfied on Jun 12, 2007 1:39:44 GMT -5
THE CLAIM: Scientifically Advanced Endurance And Recovery Enhancer!
Xtend is a precise, scientific blend of Energy Aminos consisting of the proven 2:1:1 ratio of Branched Chain Amino Acids (L-Leucine, L-Isoleucine and L-Valine), Glutamine, Citrulline Malate, and Vitamin B6 that will give you the energy you need to maximize your training while enhancing recovery at the same time. The advanced components in Xtend have been scientifically proven to help speed recovery and enhance ATP production and promote cell volumization. Avoid fatigue by blocking entry of fatigue-inducing tryptophan into the brain. Increase protein synthesis, immune function and digestive health. Promote vasodilation which can lead to better assimilation and absorption of protein. Elevate growth hormone levels.
What's In It?
Vitamin B6 (as Pyroxidine HCl): 10mg 500%
L-Leucine: 3.5 g
L-Glutamine: 2.5 g
L-Isoleucine: 1.75 g
L-Valine: 1.75 g
Citrulline Malate: 1 g
HOW TO TAKE XTEND: Mix 2 level scoops (11.29 grams) in 16 ounces of water and shake well. Depending on bodyweight, split the following dose before and during your workout:
<160 lbs: 2 scoops
160-180 lbs: 4 scoops
>180 lbs: 6 scoops
Regardless of bodyweight, consume 1 serving (2 scoops) immediately post-workout.
SCIENCE GEEK STUFF:
The BCAAs Are A Group Of Three Essential Amino Acids: Leucin, Isoleucine, Valine.
The BCAA are different from the other 17 amino acids in that they are primarily metabolized in skeletal muscle (Layman, 2003) and metabolized at a much lower rate in the liver (Norton, 2005). The rate limiting enzyme in BCAA catabolism is Branched Chain Keto Acid Dehydrogenase, which is much more active in skeletal muscle than in the liver (Norton, 2005).
The Metabolic Roles Of The BCAA Include:
- Substrate for energy production
- Substrate for protein synthesis
- Metabolic signals (Primarily Leucine)
- Stimulates protein synthesis through insulin secretion/activation of the PI3K pathway
What is interesting about the BCAA is their ability to participate in the above metabolic processes, energy substrates, substrates for protein synthesis, precursors for alanine and glutamine, and modulators of protein synthesis, is governed by their availability. Research suggests that first and foremost the BCAA are used for the synthesis of protein structures (Layman, 2003).
The constant body protein flux plus the increased leucine oxidation caused by exercise means that leucine is in high demand and therefore may not be able to participate in muscle growth at its full potential. This is where supplementing with additional BCAA comes into play and importance.
Due to leucine's metabolic properties, many people focus solely on leucine and not the other two BCAAs valine and isoleucine.Research has shown that leucine-rich diets or administration of leucine alone lead to decreases in valine and isoleucine plasma concentrations and a BCAA imbalance (Shirmomura et al., 2004). While it may be cheaper to supplement with leucine alone instead of all three BCAA, one should supplement with all three BCAA so not to create a BCAA imbalance.
As the most abundant amino acid in muscle tissue, glutamine acts as an anti-catabolic (prevents muscular breakdown) agent. At the same time, glutamine plays a positive role in protein synthesis and muscle growth.
Citrulline malate improves aerobic performance and capacity by influencing lactic acid metabolism and reducing fatigue. Supplementation of citrulline malate to humans has shown promising results. French researchers reported in several human studies that blood lactate concentrations were reduced and ammonia elimination was increased after physical exertion. Rapid recovery from physical effort correlated to the disappearance of lactate from blood after performance at a high level of acidosis suggesting an essential role in acid-base balance.
Vitamin B6 is a water-soluable vitamin needed for more than 100 enzymes involved in protein metabolism. It is also essential for red blood cell metabolism. The nervous and immune systems need vitamin B6 to function efficiently.
MY OPINION: I use this product every time I train. There are other BCAA products, but I find capsules too inconvenient (have to take too many to get an effective dose), and other powder formulations lack either the citrulline malate or B-6, key energy catalysts. This product won't give you a buzz or sleeve-busting pumps, but it might promote protein synthesis, reduce training fatigue and speed recovery. That's enough for me.
Suggested Retail Price: $34.99 for 345g (30 servings)
www.bestpricenutrition.com has it for $17.49 (30 servings)
Xtend is a precise, scientific blend of Energy Aminos consisting of the proven 2:1:1 ratio of Branched Chain Amino Acids (L-Leucine, L-Isoleucine and L-Valine), Glutamine, Citrulline Malate, and Vitamin B6 that will give you the energy you need to maximize your training while enhancing recovery at the same time. The advanced components in Xtend have been scientifically proven to help speed recovery and enhance ATP production and promote cell volumization. Avoid fatigue by blocking entry of fatigue-inducing tryptophan into the brain. Increase protein synthesis, immune function and digestive health. Promote vasodilation which can lead to better assimilation and absorption of protein. Elevate growth hormone levels.
What's In It?
Vitamin B6 (as Pyroxidine HCl): 10mg 500%
L-Leucine: 3.5 g
L-Glutamine: 2.5 g
L-Isoleucine: 1.75 g
L-Valine: 1.75 g
Citrulline Malate: 1 g
HOW TO TAKE XTEND: Mix 2 level scoops (11.29 grams) in 16 ounces of water and shake well. Depending on bodyweight, split the following dose before and during your workout:
<160 lbs: 2 scoops
160-180 lbs: 4 scoops
>180 lbs: 6 scoops
Regardless of bodyweight, consume 1 serving (2 scoops) immediately post-workout.
SCIENCE GEEK STUFF:
The BCAAs Are A Group Of Three Essential Amino Acids: Leucin, Isoleucine, Valine.
The BCAA are different from the other 17 amino acids in that they are primarily metabolized in skeletal muscle (Layman, 2003) and metabolized at a much lower rate in the liver (Norton, 2005). The rate limiting enzyme in BCAA catabolism is Branched Chain Keto Acid Dehydrogenase, which is much more active in skeletal muscle than in the liver (Norton, 2005).
The Metabolic Roles Of The BCAA Include:
- Substrate for energy production
- Substrate for protein synthesis
- Metabolic signals (Primarily Leucine)
- Stimulates protein synthesis through insulin secretion/activation of the PI3K pathway
What is interesting about the BCAA is their ability to participate in the above metabolic processes, energy substrates, substrates for protein synthesis, precursors for alanine and glutamine, and modulators of protein synthesis, is governed by their availability. Research suggests that first and foremost the BCAA are used for the synthesis of protein structures (Layman, 2003).
The constant body protein flux plus the increased leucine oxidation caused by exercise means that leucine is in high demand and therefore may not be able to participate in muscle growth at its full potential. This is where supplementing with additional BCAA comes into play and importance.
Due to leucine's metabolic properties, many people focus solely on leucine and not the other two BCAAs valine and isoleucine.Research has shown that leucine-rich diets or administration of leucine alone lead to decreases in valine and isoleucine plasma concentrations and a BCAA imbalance (Shirmomura et al., 2004). While it may be cheaper to supplement with leucine alone instead of all three BCAA, one should supplement with all three BCAA so not to create a BCAA imbalance.
As the most abundant amino acid in muscle tissue, glutamine acts as an anti-catabolic (prevents muscular breakdown) agent. At the same time, glutamine plays a positive role in protein synthesis and muscle growth.
Citrulline malate improves aerobic performance and capacity by influencing lactic acid metabolism and reducing fatigue. Supplementation of citrulline malate to humans has shown promising results. French researchers reported in several human studies that blood lactate concentrations were reduced and ammonia elimination was increased after physical exertion. Rapid recovery from physical effort correlated to the disappearance of lactate from blood after performance at a high level of acidosis suggesting an essential role in acid-base balance.
Vitamin B6 is a water-soluable vitamin needed for more than 100 enzymes involved in protein metabolism. It is also essential for red blood cell metabolism. The nervous and immune systems need vitamin B6 to function efficiently.
MY OPINION: I use this product every time I train. There are other BCAA products, but I find capsules too inconvenient (have to take too many to get an effective dose), and other powder formulations lack either the citrulline malate or B-6, key energy catalysts. This product won't give you a buzz or sleeve-busting pumps, but it might promote protein synthesis, reduce training fatigue and speed recovery. That's enough for me.
Suggested Retail Price: $34.99 for 345g (30 servings)
www.bestpricenutrition.com has it for $17.49 (30 servings)