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2002, Number 3

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Rev Med Hosp Gen Mex 2002; 65 (3)

Hypoglycemia during long swim: The factor of food

Kormanovski A, Lara-Padilla E, Díaz-Franco E, Licea-Mendoza J, Piñera-Limas F, Castañeda-Ibarra FJ

Language: Spanish
References: 18
Page: 121-127
PDF size: 94.25 Kb.


ABSTRACT

This paper compares the behavior of blood glucose during 17 long swims (LS) in open waters in two groups of experienced swimmers (3 and 4 people). During the LS, group 1 consumed a beverage that contained only carbohydrates (CHO) (30 g/hour on average) and group 2 consumed a mixture (70:30 %) of proteins/CHO (17 g protein and 7.5 g CHO/hour on average). Two cases of hypoglycemia were observed in a group 2 swimmer when he received additionally 7-10 g/hour of CHO polymers or pure glucose. A drastic increase in blood glucose was observed in the swimmers of group 1 in the first two hours, with a later average reduction to 72 mg/dL. A moderate, gradual increase in blood glucose was observed in the group 2 swimmers (from 60 to 94 mg/dL during the first 5 hours of the swim). A figure p = 0.003 was obtained for the difference between the two groups. This difference did not depend on sex or age. We assume this variation most probably reflects the difference in the swimmers’ energy metabolism in relation to CHO.


REFERENCES

  1. Kormanovski A, Lara-Padilla E, Castañeda-Ibarra FJ, Campos-Rodriguez R, Piñera-Limas F, Licea-Mendoza J. Respuesta metabólica del organismo humano durante el nado largo. Rev Hosp Jua Mex 2001; 68 (2): 57-62.

  2. McGilvery RW. The use of fuels for muscular work. In: Howald H, Poortmans JR (eds). Metabolic adaptation to prolonged physical exercise. Basel: Birkhauser Verlag, 1975, 12-30.

  3. Gollnick PD. Metabolism of substrates: Energy substrate metabolism during exercise and as modified by training. Fed Proc 1985; 44: 353-357.

  4. Hochachka PW, Somero GN. Biochemical adaptation. Princeton: University Press, 1984.

  5. Holloszy JO, Booth FW. Biochemical adaptations to endurance exercise in muscle. Ann Rev Physiol 1976; 38: 273-291.

  6. Yacovlev NN. Bioquímica deportiva. Fiscultura y sport. Moscu, 1974.

  7. Hultman E. Muscle glycogen store and prolonged exercise. Erontiers of fitness. Springfield, Illinois: RJ Shepard. CC Tomas, 1971; 30-42

  8. Karlsson J, Saltin B. Diet, muscle glycogen and endurance performance. J Appl Physiol 1971; 38: 203-206.

  9. Howald H, von Glutz G, Billeter R. Energy stores and substrates utilization in muscle during exercise. In: 3rd Intl Symp on Biochemistry of Exercise. Miami: F. Landry and WAR Orban, 1978; 99-126.

  10. Fitts R, Courtright J, Kim D, Witzmann F. Muscle fatigue with prolonged exercise: Contractile and biochemical alterations. Am J Physiol 1982; 242: 65-73.

  11. 11 Coyl EF. Carbohydrate metabolism and fatigue. In: La fatigue musculaire: Aspects biochimiques et physiologiques. Paris, 1991; 153-164.

  12. Edwards HT, Margaria R, Dill DB. Metabolic rate, blood sugar, and the utilization of carbohydrate. Am J Physiol 1932; 108: 203-209.

  13. McDougall JD, Ward GR, Sale DG, Sutton JR. Muscle glucogen repletion after high-intensity intermittent exercise. J Appl Physiol 1977; 42: 129-132.

  14. Ivy et al. Muscle glycogen synthesis after exercise: Effect of time on carbohydrate ingestion. J Appl Physiol 1988; 64: 1480-1485.

  15. Bean A. The complete guide to sports nutrition. Black Publishers Limited, 1998.

  16. Marriott BM, Carlson SJ (eds). Nutritional needs in cold and in high-altitude environments. Washington, DC: National Academy Press, 1996

  17. Costill DL. Carbohydrates for exercise: Dietery demands for optimal performance. Int J Sports Med 1988; 9: 1-18.

  18. Siff MC, Verkhoshansky Y. Superentrenamiento. Barcelona: Paidotribo, 2000.




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