Vitamin C, also known as ascorbic acid, is a water-soluble vitamin that must be obtained through our diet.

Vitamin C is required for the synthesis of collagen, an important structural component of blood vessels, tendons, ligaments, and bone. Vitamin C also plays an important role in the synthesis of the neurotransmitter, norepinephrine. Neurotransmitters are critical to brain function and are known to affect mood. In addition, vitamin C is required for the synthesis of carnitine, a small molecule that is essential for the transport of fat to cellular organelles called mitochondria, for conversion to energy and eecent research also suggests that vitamin C is involved in the metabolism of cholesterol to bile acids.

Vitamin C is most known as a highly effective antioxidant. Even in small amounts vitamin C can protect the body from damage by free radicals. Vitamin C may contirbute to the regeneration of other antioxidants such as vitamin E.

vitamin C for supplementation for athletes has been shown in multiple studies that blood and plasma levels of are diminished and one of them reached a conclusion that that blood vitamin C levels even decreased in athletes ingesting 100 mg per day.

This may suggest vitamin C needs are increased in those who exercise regulary. Athletes receiving a one-gram vitamin C supplemention showed an increased work capacity at a heart rate of 170 beats per minute in one of the studies, while placebos that served as self-controls during vitamin C supplementation repeatedly demonstrated decreased blood plasma levels.

Vitamin C can improve the amount of iron that the body absorbs by forming a chelate with ferric iron at acid pH that remains soluble at the alkaline pH of the duodenum.


Refferences:

Block, G., A.R. Mangels, B.H. Patterson, O.A. Levander, E.P. Norkus and P.R. Taylor. Body weight and prior delpletion affect plasma ascorbate levels attained on identical vitamin C intake: a controlled-diet study. J. Am. Coll. Nutr. 18(6): 628-637, 1999. [Abstract]
 
Bucci, L.R. Dietary Supplements As Ergogenic Aids. In Nutrition in Exercise and Sport. 3rd Edition. Edited by Ira Wolinsky. New York: CRC Press, 1998, p. 328.
Child R., S. Brown, S. Day, A. Donnelly, H. Roper, and J. Saxton. Changes in indices of antioxidant status, lipid peroxidation and inflammation in human skeletal muscle after eccentric muscle actions. Clinical Science 96: 105-115, 1999. [Abstract]
 
Clarkson P. M. Antioxidants and physical performance. Crit. Rev. Food. Sci. Nutr. 35: 131-141, 1995. [Abstract]
 
DeBolt, J.E., A. Singh, B.A. Day, and P.A. Deuster. Nutritional survey of the US Navy SEAL trainees. Am. J. Clin. Nutr. 48(5): 1316-1323, 1988. [Abstract]

Dekkers, J. C., L. J. P. van Doornen, and Han C. G. Kemper. The role of antioxidant vitamins and enzymes in the prevention of exercise-induced muscle damage. Sports Med. 21: 213-238, 1996. [Abstract]

Gey, G.O., K.H. Cooper, and R.A. Bottenberg. Effect of ascorbic acid on endurance performance and athletic injury. JAMA. 211(1): 105, 1970. [Abstract]
 
Gleeson, M., J.D. Robertson, and R.J. Maughan. Influence of exercise on ascorbic acid status in man. Clin. Sci. 73(5): 501-505, 1987. [Abstract]

Goldfarb, A. H. Nutritional antioxidants as therapeutic and preventive modalities in exercise-induced muscle damage. Can. J. Appl. Physiol. 24: 249-266, 1999. [Abstract]

Groff, J.L., Gropper S.S., and Hunt S.M. The Water Soluble Vitamins. In: Advanced Nutrition and Human Metabolism. Minneapolis: West Publishing Company, 1995, p. 222-237.
Haymes, E.M. Vitamin and Mineral Supplementation to Athletes. Int. J.Sport. Nutr. 1:146-169, 1991. [Abstract]

Alessio, H.M., and E.R. Blasi. Physical activity as a natural antioxidant booster and its effect on a healthy lifestyle. Res. Q. Exerc. Sport. 68 (4): 292-302, 1997. [Abstract]

Balakrishnan, S.D., and C.V. Anuradha. Exercise, depletion of antioxidants and antioxidant manipulation. Cell Biochem Funct. 16(4): 269-275, 1998. [Abstract]

Bazzarre, T.L., S.M. Kleiner, and B.E. Ainsworth. Vitamin C intake and lipid profiles of competitive male and female bodybuilders. Int. J. Sport. Nutr. 2(3): 260-271

Howald, H., B. Segesser, and W.F. Korner. Ascorbic acid and athletic performance. Ann. N.Y. Acad. Sci. 258: 458-464, 1975. [Abstract]
 
Jacob, R.A., Vitamin C. In: Modern Nutrition in Health and Disease. Ninth Edition. Edited by Maurice Shils, James Olson, Moshe Shike, and A. Catharine Ross. Baltimore: Williams & Wilkins, 1999, p. 467-482.
Jakeman, P., and S. Maxwell. Effect of antioxidant vitamin supplementation on muscle function after eccentric exercise. Eur. J. Appl. Physiol. 67(5): 426-430, 1993. [Abstract]

Jenkins, R.R. Exercise, oxidative stress and antioxidants: A review. Int. J. Sport. Nutr. 3: 356-375, 1993. [Abstract]
 
Jenkins R.R. and A. Goldfarb. Introduction: oxidant stress, aging, and exercise. Med. Sci. Sports. and Exerc. 25:210-212, 1993. [Abstract]

Kaminski, M., and R. Boal. An effect of ascorbic acid on delayed-onset muscle soreness. Pain. 50:317-321, 1992. [Abstract]

Kanter M.M. Free radicals exercise and antioxidant supplementation. Int. J. Sport. Nutr. 4:205-220, 1994. [Abstract]
 
Karlsson J. Exercise, muscle metabolism and the antioxidant defense. World Rev. Nutr. Diet. 82:81-100, 1997. [Abstract]

Keith, R.E. Ascorbic Acid. In: Sports Nutrition Vitamins and Trace Minerals. Edited by Ira Wolinsky and Judy A. Driskell. New York: CRC Press, 1997, p. 29-45119-131.
Keith, R.E., K.A. O'Keeffe, L.A. Alt, and K.L. Young. Dietary status of trained female cyclists. J. Am. Diet. Assoc. 89(11): 1620-1623, 1989. [Abstract]
 
Keren, G., and Y. Epstein. The effect of high dosage vitamin C intake on aerobic and anaerobic capacity. J. Sports Med. 20(2): 145-148, 1990.
 
Kotze, H.F., Van Der Walt, W.H., Rogers, G.G., and N.B. Strydom. Effects of plasma ascorbic acid levels on heat acclimatization in man. J. Appl. Physiol. 42(5): 711-716, 1977. [Abstract]
 
National Academy of Sciences. Dietary Reference Intakes: Recommended Intakes for Individuals. Food and Nutrition Board, Institute of Medicine. 2000.
 
Packer, L. Oxidants, antioxidant nutrients and the athlete. J. Sports Sci. 15: 353-363, 1997. [Abstract]
 
Peters, E.M., J.M. Goetzsche, B. Grobbelaar, and T.D. Noakes. Vitamin supplementation reduces the incidence of postrace symptoms of upper-repiratory-tract infection in ultramarathon runners. Am. J. Clin. Nutr. 57(2): 170-174, 1993. [Abstract]
 
Rokitski, L., E. Logemann, A.N. Sagerdos, M. Murphy, W. Metzel-Roth, and J. Keul. Lipid peroxidation and antioxidant vitamins under extreme endurance stress. Acta. Physiol. Scand. 151: 149-158, 1994b. [Abstract]
Shephard R.J., R. Campbell, and P. Rimm. Vitamin E, exercise and the recovery from physical activity. Eur. J. Appl. Physiol. 33:119-126, 1974. [Abstract]
 
Strydom, N.B., H. F. Kotze, Van Der Walt, W.H., and G.G. Rogers. Effect of ascorbic acid on rate of heat acclimatization. J. Appl. Physiol. 41(2): 202-205, 1976. [Abstract]

Telford, R.D., E.A. Catchpole, V. Deakin, A.G. Hahn, and A.W. Plank. The Effect of 7 to 8 Months of Vitamin/Mineral Supplementation on Athletic Performance. Int. J. Sport. Nutr. 2:135-153, 1999. [Abstract]
 
Telford, R.D., E.A. Catchpole, V. Deakin, A.C. McLeay, and A.W. Plank. The effect of 7 to 8 months of vitamin/mineral supplementation on the vitamin and mineral status of athletes. Int. J. Sport. Nutr. 2(2): 132-134, 1992. [Abstract]

Tiddus PM. Radical species in inflammation and overtraining. Can. J. Physiol. Pharmacol. 76(5): 533-538, 1998. [Abstract]

Weight, L.M., T.D. Noakes, D. Labadarios, J. Graves, P. Jacobs, and P.A. Berman. Vitamin and mineral status of trained athletes including the effects of supplementation. Am. J. Clin.. Nutr. 47(2): 186-191, 1988. [Abstract]

Zeeman, F.J. Appendix C. Normal Laboratory Values. In: Clinical Nutrition and Dietetics. New York: McMallian Publishing Company, 1991, p. 760-765.

Be the first to rate this post

  • Currently 0/5 Stars.
  • 1
  • 2
  • 3
  • 4
  • 5

Related posts

Add comment


 

  Country flag

[b][/b] - [i][/i] - [u][/u]- [quote][/quote]



Live preview

Friday, December 05, 2008 5:01 AM

Dedicated Research

We begin with an honest approach in our philosophy to share our research and studies with our consumers. This philosophy is also one of the key differences between Dedicated Athlete Inc. and our competitors.

About Us | Contact Us | Anti-Doping Policy | Employment | Privacy Policy | Return Policy ©2007 Dedicated Athlete
The statements contained herein have not been evaluated by the Food and Drug Administration. These products are not intended to diagnose, treat, cure or prevent any disease.