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Aside from training, nutrition may be the most important influence on athletic performance. An adequate number of calories, carbohydrates, protein, and even dietary fat and water are necessary for a healthy body and especially for an athlete’s body. Nutrient needs often increase faster than calorie needs for the athlete, yet many athletes do not always eat an optimal diet. Meanwhile, even marginal deficiencies of essential nutrients can reduce endurance, shorten the time to fatigue, or make it more difficult to improve performance. See Calorie Chart
 
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Nutritional supplements that may be helpful
Strenuous exercise increases the production of harmful substances called free radicals which can damage muscle tissue and result in inflammation and aching muscles. Exercising in cities or smoggy areas also increases exposure to free radicals. Antioxidants, including vitamin C and vitamin E, neutralize free radicals before they can damage the body; although antioxidants do not improve athletic performance, they may aid in exercise recovery. Regular exercise increases the efficiency of the antioxidant defense system, but an extra boost of antioxidant vitamins may be needed in older or untrained individuals or athletes who are undertaking an especially vigorous training protocol or athletic event.1
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The B-complex vitamins are also important for athletes because they are needed to unlock the energy from carbohydrates. Exercisers may have slightly increased requirements for some of the B vitamins, such as vitamin B2, vitamin B6, and pantothenic acid. 2 Athletic performance could suffer if these increased needs are not met.

Intense exercise alters the body’s use and requirements for several minerals. For example, exercise can decrease blood levels and increase urinary losses of chromium and zinc. Low levels of these minerals interfere with blood sugar regulation, energy production, tissue repair, and resistance to colds and infections.3

Chromium, in a form called chromium picolinate, has been studied for its potential role in altering body composition. Although preliminary research in animals4 and humans5 6 suggested that chromium picolinate increases fat loss and lean muscle tissue gain, follow-up research in people has not confirmed chromium picolinate to have a significant effect in altering body composition.7

Iron is crucial for the athlete because it transports oxygen to and within the muscle cells. However, some athletes do not get enough of this mineral. In fact, up to 80% of exercising women are iron deficient, which can result in reduced endurance, muscle soreness, fatigue, lethargy, irritability, and poor concentration.8 Nonetheless, it is unwise to supplement with iron unless a deficiency has been diagnosed. Athletes who experience undue fatigue (an early warning sign of iron deficiency) should have their iron status evaluated by a nutritionally oriented physician.

 Beef Liver tablets are a great source of iron.  Fortify with extra B-12 (blood builder) and essential vitamins, minerals make and an excellent source of amino acids.

Magnesium plays many roles in the athlete’s body. This mineral aids in muscle contraction and relaxation, facilitates nerve function, maintains the heartbeat   and blood pressure, and helps build muscle. Strenuous exercise may increase magnesium requirements while increasing urinary losses of magnesium, thus placing an extra drain on magnesium   status.9     Also see ZMA      

Certain amino acids, the building blocks for protein, might be ergogenic aids (performance enhancers). However, while it is now established that athletes have an increased need for protein compared with other adults, the maximum amount of protein suggested by researchers—1.5 grams for every 2.2 pounds of body weight—is already in the diet of most athletes. Eating larger amounts of protein may be linked to osteoporosis and kidney disease.
For those few athletes who consume less than optimal amounts of protein from their diets, branched-chain amino acids, or BCAAs, which include the amino acids leucine, isoleucine, and valine, are needed for the maintenance of muscle tissue and for intense exercise. BCAA supplements may reduce muscle loss and speed muscle gain.10  Research
Research shows that individuals who supplement with carnitine while engaging in an exercise regimen are less likely to experience muscle soreness.11
A small number of clinical trials also indicate that supplements of pyruvate, an altered form of sugar, enhance exercise endurance. However, the research with pyruvate is preliminary and further trials are needed to determine if the effect on performance is significant.12 13
Whey protein is a dairy-based source of amino acids. Whey protein provides the body with the BCAAs that are needed for the maintenance of muscle tissue. Other amino acids also influence athletic performance. Leucine, isoleucine, and valine (the amino acids that collectively form the branched-chain amino acids) are used individually by some bodybuilders and other athletes to promote muscle recovery.
Some experts have claimed that ornithine promotes muscle-building activity in the body, but subsequent research has not supported these claims.14 A similar compound, ornithine alpha-ketoglutarate (NO), or OKG, is formed from the amino acids ornithine and glutamine. OKG is believed to enhance the body’s release of muscle-building hormones, such as growth hormone and insulin, and increases arginine and glutamine levels in muscle. OKG also encourages synthesis of polyamine and helps prevent the breakdown of muscle while increasing muscle growth.15 16
Creatine monohydrate assists in the production of energy and muscle-building processes. Most of the creatine in the body is stored in the muscles as creatine or in a form called phosphocreatine.17 Creatine is a quickly available energy source for muscle contraction.18 It also increases the synthesis of muscle protein and assists in the formation of polyamines (powerful growth promoters).19 Creatine also promotes protein synthesis by causing the muscles to swell, which is called “cell volumizing.”
Gamma oryzanol is a mixture of sterols and ferulic acid esters. Preliminary evidence suggests that it increases testosterone levels, the release of endorphins, and the growth of lean muscle tissue.20
Medium chain triglycerides are a class of fatty acids, but unlike other fats, the medium chain triglycerides are more rapidly absorbed and burned as energy.21 However, most people consume an adequate, if not excessive, amount of fat in their diets, so extra fat intake as medium chain triglycerides is probably unnecessary.
The use of DMSO for therapeutic applications is controversial, but there is some evidence that when applied directly to the skin DMSO has anti-inflammatory properties and inhibits the transmission of pain messages by nerves, and in this way might ease the pain of muscle injuries.22 23
HMB, a metabolite of the essential amino acid leucine (one of the branched-chain amino acids), may enhance the growth of lean muscle tissue, according to animal research.24 Preliminary and limited research in humans supports the potential link between HMB and enhanced muscle building in athletes.25 One study involving twenty-eight individuals involved in a regular weight-lifting program found that supplements of 3 grams of HMB, compared to no supplements, contributed to greater gains of muscle over the seven-week-long study.26
Inosine is another ATP product that works with muscle energy. In animal studies, heart tissue deprived of enough oxygen releases inosine. The effect of this increased inosine is more blood flow to the heart muscle, and up to double ATP production. 

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Inosine provides the muscle with strength, recovery and oxygen necessary for endurance and staying power. 1500 mg. per capsule.

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1300 mg of Magnesium. Providing 200 mg Magnesium chelated to 1,100 mg of Malic Acid. Promotes muscle relaxation. Adequate magnesium must be available to relax muscles and relieve cramping, stiffness and soreness. Magnesium is also especially important as a co-factor for the use of energy in the heart. 
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Are there any side effects or interactions?
(Refer to the individual supplement for complete information.) Vitamin E side effects are very rare, as are side effects from vitamin C. However, some individuals experience diarrhea when taking a few thousand milligrams of vitamin C per day. Vitamin B2 is nontoxic, even in high amounts. Vitamin B6 side effects are rare, but nervous system changes can occur with dosages above 200 mg per day. Toxicity has not been reported for pantothenic acid at supplemental doses; very large amounts (several grams per day) can cause diarrhea. In supplemental doses (typically 50-300 mcg per day), chromium has not been linked consistently with any toxicity in humans. Zinc intake in excess of 300 mg per day may impair immune function. In addition, it is important to balance zinc and copper intake.

Huge overdoses of iron (as when a child swallows many iron pills) can be fatal. Keep iron-containing supplements out of a child’s reach. Hemochromatosis, hemosiderosis, polycythemia, and iron-loading anemias (such as thalassemia and sickle cell anemia) are conditions that involve excessive storage of iron. Supplementing iron can be quite dangerous for people with these diseases.

Taking too much magnesium often leads to diarrhea. Occasionally, this can happen at doses as low as 350-500 mg per day. Excessive magnesium intake is more serious, but it is rarely caused by magnesium supplements. People with kidney disease should not take magnesium supplements without consulting a physician.

Side effects have not been reported with the use of BCAAs. Carnitine has not been consistently linked with any toxicity symptoms. High intakes of pyruvate can trigger gastrointestinal upset, such as gas, bloating, and diarrhea. People who are allergic to dairy products could react to whey protein and should therefore avoid it. As with protein in general, long-term excessive intake is associated with deteriorating kidney function and possibly osteoporosis. However, neither kidney or bone problems have been directly associated with whey protein; the other dietary sources of protein probably contribute more protein to the diet than whey protein.

For most people, consuming higher amounts of leucine, isoleucine, or valine is not associated with any health risks. However, individuals with kidney or liver disease should not consume high intakes of amino acids without consulting their doctor.

There are no reported side effects with the use of inosine, ornithine, or ornithine alpha-ketoglutarate. A potential problem with supplemental intake of creatine is that the body’s production of creatine may be reduced when large amounts of supplemental creatine are taken.

No side effects have been reported with the use of gamma oryzanol. Consuming medium chain triglycerides on an empty stomach can lead to gastrointestinal upset. Anyone with cirrhosis or other liver problems or lung problems, such as chronic pulmonary obstructive disease, should not use medium chain triglycerides.

DMSO is associated with several undesirable effects, the most common being a garlic-like body odor and taste in the mouth. Also reported are stomach upset, sensitivity to light, visual disturbances, and headache. Skin irritation can develop at the site where DMSO is applied to the skin. It is very important to use only high-quality DMSO, since the solvent properties of DMSO allow any contaminants to be absorbed through the skin and transported into the bloodstream.

No safety issues have been reported with HMB in the limited number of studies currently available.

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Herbs that may be helpful
Some athletes during their training utilize energizing herbs, such as Asian ginseng, eleuthero (Siberian ginseng), and guaranį.
Sports Supplements
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Are there any side effects or interactions?
(Refer to the individual herb for complete information.) Guaranį may cause insomnia, trembling, anxiety, palpitations, urinary frequency, and hyperactivity. Its use should be avoided during pregnancy and lactation. Long-term use may cause decreased fertility, cardiovascular disease, and several forms of cancer, according to epidemiological studies of caffeine use.
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References:

  1. Dekkers JC, van Doornen LJ, Kemper HC. The role of antioxidant vitamins and enzymes in the prevention of exercise-induced muscle damage. Sports Med 1996;21(3):213-38.
  2. Keith R, Alt L. Riboflavin status of female athletes consuming normal diets. Nutr Res 1991;11(7):727-34.
  3. Lukaski H, Hoverson B, Gallagher S, et al. Physical training and copper, iron, and zinc status of swimmers. Am J Clin Nutr 1990;51:1093-9.
  4. Page TG, Ward TL,  Southern LL. Effect of chromium picolinate on growth and carcass characteristics of growing-finishing pigs. J Animal Sci 1991;69:356.
  5. Lefavi R, Anderson R, Keith R, et al. Efficacy of chromium supplementation in athletes: Emphasis on anabolism. Int J Sport Nutr 1992;2:111-22.
  6. McCarty MF. The case for supplemental chromium and a survey of clinical studies with chromium picolinate. J Appl Nutr 1991;43:59-66.
  7. Rogers MA. Medicine and Science in Sports and Exercise 1996;28(2).
  8. Weaver C, Rajaram S. Exercise and iron status. J Nutr 1992;122:782-787.
  9. Drilla L, Haley T. Effect of magnesium supplementation on strength training in humans. J Am Col Nutr 1992;11(3):326-9.
  10. Blomstrand E, Hassmen P, Ek S, et al. Influence of ingesting a solution of branched-chain amino acids on perceived exertion during exercise. Acta Physiol Scand 1997;159:41-9.
  11. Giamberardino MA et al. Effects of prolonged L-carnitine administration on delayed muscle pain and CK release after eccentric effort. Int J Sports Med 1996;17:320-4.
  12. Stanko RT, Robertson RJ, Galbreath RW, et al. Enhanced leg exercise endurance with a high-carbohydrate diet and dihyroxyacetone and pyruvate. J Appl Phys 1990;69(5):1651-6.
  13. Stanko RT, Robertson RJ, Spina RJ, et al. Enhancement of arm exercise endurance capacity with dihydroxyacetone and pyruvate. J Appl Phys 1990;68(1):119-24.
  14. Bucci LR, Hickson JF, Wolinsky I, et al. Ornithine supplementation and insulin release in bodybuilders. Int J Sport Nutr 1992;2:287-291.
  15. Jeevanandam M, Holaday NJ, Petersen SR. Ornithine-alpha-ketoglutarate (OKG) supplementation is more effective than its component salts in traumatized rats. J Nutr 1996;126(9):2141-50.
  16. Le Bricon T, Cynober L, Baracos VE. Ornithine alpha-ketoglutarate limits muscle protein breakdown without stimulating tumor growth in rats bearing Yoshida ascites hepatoma. Met Clin Exp 1994;43(7):899-905.
  17. Greenhaff PL, Bodin K, Soderlund K, et al. Effect of oral creatine supplementation on skeletal muscle phosphocreatine resynthesis. Am J Physiol 1994;266:E725-730.
    Greenhaff PL. Creatine and its application as an ergogenic aid. Int J Sport Nutr 1995;5:94-101.
  18. Earnest CP, Snell PG, Rodriguez R, et al. The effect of creatine monohydrate ingestion on anaerobic power indices, muscular strength, and body composition. Acta Physiol Scand 1995;153:207-209.
  19. Rosenbloom C, Millard-Stafford M, Lathrop J. Contemporary ergogenic aids used by strength/power athletes. J Am Diet Assoc 1992;92(10):1264-1265.
  20. Jeukendrup AE, Saris WHM, van Diesen RAJ, et al. Exogenous MCT oxidation from carbohydrate-medium chain triglyceride supplements during moderate intensity exercise. Clin Sci 1994;87:33.
  21. American Medical Association. Dimethyl sulfoxide. Controversy and Current Status—1981. JAMA 1982;248:1369–71.
  22. Jacob SW, Wood DC. Dimethyl sulfoxide (DMSO). Toxicology, pharmacology, and clinical experience. Am J Surg 114:414–26.
  23. Nissen SL, Morrical D, Fuller JC. Effects of the leucine catabolite beta-hydroxy-beta-methylbutyrate (HMB) on the growth and health of growing lambs. J Animal Sci 1994;77:243.
  24. Nissen S, Panton L, Wilhelm R, et al. Effect of beta-hydroxy-beta-methylbutyrate (HMB) supplementation on strength and body composition of trained and untrained males undergoing intense resistance training. FASEB J 1996;10:A287 (abstract).
  25. Nissen S, Sharp R, Ray M, et al. Effect of leucine metabolite beta-hydroxy-beta-methylbutyrate on muscle metabolism during resistive-exercise training. J Appl Phys 1996;81:2095–104.

 
 
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