人體必需氨基酸
人體必需氨基酸是非常重要的氨基酸，身體需要這些氨基酸卻無法自我製造，所以必須中飲食攝取所得。當人體從飲食中獲得這些必需氨基酸後，便能夠製造很多有用的非必需氨基酸。一項研究發現，在進行負重訓練一兩個小時後，服用6克適當比例的人體必需氨基酸，能增加肌肉蛋白質的合成。而在負重鍛鍊前服用的話，肌肉蛋白質的合成更大為增加。研究說明在合適時間服用適當比例人體必需氨基酸可顯著提高肌肉蛋白質的合成。
支鏈氨基酸BCAA
支鏈氨基酸BCAA包括亮氨酸、異亮氨酸和纈氨酸。運動時服用BCAA有助維持肌肉組織健康，防止肌肉受到損害。愛好運動人士常於鍛煉身體後服用BCAA，以確保肌肉能迅速恢復。支鏈氨基酸也供應心臟和骨骼肌肉能量所需。一些研究表明，補充支鏈氨基酸對運動效能有增補作用，能強身健體的效果又不會讓脂肪增加。研究還表明，專業運動員使用支鏈氨基酸能防止體重和最佳運動體能下降。即使普通運動人士服用支鏈氨基酸後也有助增加肌肉量(不含脂肪)而體力也獲得明顯增加。
精氨酸
精氨酸於身體擔負幾個重要角色。它也是最普遍使用的健身增補劑。精氨酸能提高體內一氧化氮水平，這能提高運動表現。一氧化氮水平提高會促使肌肉血流量增加，為這些細胞提供更多氧氣和養分。補充精氨酸被認為能增加一氧化氮的產量，從而導致血流量明顯增加。
鳥氨酸
鳥氨酸由精氨酸分解而來。它也有助於建立肌肉和減少體內脂肪量，尤其當結合精氨酸和左旋肉鹼等氨基酸一起服用時效用更佳。鳥氨酸也是瓜氨酸、脯氨酸、谷氨酸這3種重要氨基酸合成所必需的氨基酸，為體內每個細胞提供更多能量。鳥氨酸精氨酸混合配方是的非常熱門的健身肌肉增補配方。
不過，世上並沒有什麼神奇補充劑能不做運動也促進肌肉生長。最可取的方法，是做適量運動配合健康，再補充適當氨基酸的話便能大大提高運動效能。
Amino-Acid and Fitness Connection
For decades, athletes (especially bodybuilders) have used amino-acid supplements as ergogenic aids (something that increases muscular work capacity) and to help meet athletic goals.
Essential Amino Acids
An essential amino acid is one that your body needs but does not manufacture; you must obtain it through diet. When essential amino acids are present in the diet, the body is able to make an adequate supply of nonessential amino acids. One study finds that when people take 6 grams of essential amino acids in the right proportions one or two hours after resistance training, the result is an increase in muscle protein synthesis. When they’re taken before weight training, the increase in muscle protein synthesis is even greater. When used in the right proportions and taken at the right times, essential amino acids can significantly increase muscle protein synthesis.
Branched-Chain Amino Acids
The branched-chain amino acids (BCAAs)—leucine, isoleucine, and valine—maintain muscle tissue by preventing breakdown during exercise. They’re commonly used by athletes to ensure a quick recovery after a workout. BCAAs also supply energy to the heart and skeletal muscles. Several studies suggest that supplementation with BCAAs has an ergogenic effect in people who exercise, including an increase in lean body mass. Research also shows that highly trained athletes using BCAAs are able to avoid the significant loss in body weight and decrease in peak power experienced by those not taking them. Even untrained individuals using BCAAs experience a significant increase in fat-free mass and grip strength.
Arginine
Arginine has several important roles in your body. Its most popular use as an ergogenic supplement is its ability to augment nitric oxide levels, possibly helping to enhance your performance. Nitric oxide increases blood flow to working muscles, which in turn leads to increased oxygen transport and delivery of fuel to skeletal muscle. Supplemental arginine is thought to augment nitric oxide production, leading to an increase in blood flow.
Ornithine
Ornithine is derived from the breakdown of arginine. It helps build muscle and reduce body fat, especially when combined with the amino acids arginine and carnitine. Ornithine is also needed for the formation of citrulline, proline, and glutamic acid, three amino acids that help supply energy to every cell in the body. Ornithine is often combined with arginine as a muscle-building supplement.
There is no magic pill that works without exercise to promote muscle growth and improve performance. But when combined with a healthful diet, amino acids may help you achieve your sports-nutrition goals.
No comments:
Post a Comment