Abstract
We studied changes in physical characteristics: body composition; muscle and physical strength; hematological parameters; and nutrients and food intake in 22 male college judoists who were losing weight purposefully. Nutritional parameters in blood, such as triglycerides, decreased immediately before matches and rebounded after matches. Free fatty acid increased before matches and returned to previous levels 10 days after matches. IgM and complements decreased before matches and did not return to previous levels even 10 days after matches. These changes were noted in the marked weight reduction group (weight lost / body weight before weight reduction, weight reduction rate≥6%). In contrast, creatine kinase increased before matches in the slight and moderate weight reduction groups (weight reduction rate< 3%, 3≤and<6%, respectively). The marked weight reduction group showed no changes in creatine kinase, however, indicating inadequate exercise due to excessive weight reduction. Muscle strength (grip) and nutrients and food intake decreased significantly before matches. These changes were noted in the marked weight reduction group. These findings suggested that a weight reduction rate of 6% or more adversely affected the performance and health of the judoist.
Similar content being viewed by others
References
Morgan WP. Psychological effect of weight reduction in the college wrestlers. Med Sci Sports 1970;2: 24–7.
Singer RM, Weiss SA. Effect of weight reduction on selected anthropometric, physical and performance measures of wrestlers. Res Quart 1968;39: 361–9.
Zambraski EJ, Tipton CM, Tcheng TK, Jordan HR, Vailas AC, Calla-han AK. Iowa Wrestling Study: Change in the urinary profiles of wrestlers prior to and after competition. Med Sci Sports 1975;7: 217–20.
Houston ME. The effect of rapid weight loss on physiologicsl functions in wrestlers. Phys Spoots Med 1981 ;9:73–9.
Scott W, Rutt R, Weltman A. Physiological effects of a weight loss regimen practiced by college wrestlers. Med Sci Sports 1990; 22: 229–34.
Steen SN, Oppliger RA, Brownell KD. Metabolic effects of repeated weight loss and regain in adolescent wrestlers. JAMA 1988;260: 47–50.
Kita H, Itoh M. The measurement of physical strength in weight reduction period of college boxers(l). Taiikugaku Kenkyu 1969; 11: 46.
Shinozaki S, Nakayama J; Watanabe T, Abiko S. A study on weight reduction of senior highschool boxers. Taiikugaku Kenkyu 1965;7: 283.
Buskirk ER. Underwater weighing and body density: A review of procedures. In: Brozek J, Henschel A, editor. Techniques for Measuring Body Composition, Washington D.C.: National Academy of Sciences National Research Council, 1961: 90–106.
Rahn H, Fenn W, Otis AB.12 Daily variations of vital capacity, residual air, expiratory reserve including a study of die residual air method. J Appl Physiol 1949;1: 725–36.
Brozek J, Grande F, Anderson JT, Keys A. Densitometric analysis of body composition: Revision of some quantitative assumptions. Ann NY Acad Sci 1963; 110: 113–40.
Nakamura Y, Muto Y, Miyashita M. The measurement method of maximal anaerobic power by bicycle ergometer. Jpn J Sports Sci 1984;3: 834–9.
Ayalon A, Inbar O, Fur-Or O. Relationships among measurements of explosive strength and anaerobic power. In: Nelson RC, Morehouse A, editors. International Series on Sports Sciences Vol. 1 Biomechanics. University Park Press, 1974:527–32.
Resources Council, Science and Technology Agency, Japan. Standard Tables of Food Composition in Japan. 4th ed. Tokyo: Printing Division of the Finance Ministry, 1982.
Noakes TD, Carter JW. The responses of plasma biochemical parameters to a 56-km race in novice and experienced ultramarathon runners. Eur J Appl Physiol 1982;49: 179–86.
Gardner GW, Bratton R, Chowdhury SR. Effect of exercise on serum enzym elevels in trained subject. J Sports Med Phys Fitness 1964;4: 103–10.
Author information
Authors and Affiliations
Rights and permissions
About this article
Cite this article
Kurakake, S., Umeda, T., Nakaji, S. et al. Changes in physical characteristics, hematological parameters and nutrients and food intake during weight reduction in judoists. Environ Health Prev Med 3, 152–157 (1998). https://doi.org/10.1007/BF02931706
Received:
Accepted:
Issue Date:
DOI: https://doi.org/10.1007/BF02931706