Document Detail


Gradual and rapid weight loss: effects on nutrition and performance in male athletes.
MedLine Citation:
PMID:  8455453     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
We studied seven male wrestlers and three judo athletes (weight 55-93 kg) during two weight reductions. In the "gradual" procedure (GP), a 5.0 +/- 0.4% (mean +/- SEM) weight loss was achieved in 3 weeks by energy restriction. In the "rapid" procedure (RP), 6.0 +/- 0.6% of body weight was lost in 2.4 days by fluid and diet restriction and forced sweating, and followed by a 5-h "loading" (food and drinks ad libitum). The net weight loss after GP and loading was 2.7 +/- 0.5%. Protein intakes (4-d food records) during GP and RP were 71 +/- 16 and RP 56 +/- 17 g.d-1, respectively. Carbohydrate intakes were 239 +/- 56 (GP) and 182 +/- 55 g.d-1 (RP). During GP and RP, mean thiamin, magnesium, and zinc intakes were at or below the respective recommendation. Thiamin, riboflavin, potassium, iron, and zinc status, assessed from blood chemistry, remained stable during both procedures. Changes in vitamin B6 indicator (E-ASTAC) and S-magnesium concentration were different (P < 0.01) between the procedures, suggesting negative trends during GP. Sprint (30-m run) and anaerobic (1-min Wingate test) performance was similar throughout the study. Following GP, vertical jump height with extra load increased by 6-8% (P < 0.01). Jumping results were not affected by RP. Hence, < or = 5% loss in body weight by either method did not impair experienced athletes' performance.
Authors:
G M Fogelholm; R Koskinen; J Laakso; T Rankinen; I Ruokonen
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Publication Detail:
Type:  Comparative Study; Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Medicine and science in sports and exercise     Volume:  25     ISSN:  0195-9131     ISO Abbreviation:  Med Sci Sports Exerc     Publication Date:  1993 Mar 
Date Detail:
Created Date:  1993-04-20     Completed Date:  1993-04-20     Revised Date:  2008-11-21    
Medline Journal Info:
Nlm Unique ID:  8005433     Medline TA:  Med Sci Sports Exerc     Country:  UNITED STATES    
Other Details:
Languages:  eng     Pagination:  371-7     Citation Subset:  IM; S    
Affiliation:
Department of Applied Chemistry and Microbiology, University of Helsinki, Finland.
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MeSH Terms
Descriptor/Qualifier:
Adolescent
Adult
Aspartate Aminotransferases / blood
Diet, Reducing / methods*
Dietary Carbohydrates
Drinking
Eating
Energy Intake
Energy Metabolism
Ergometry
Food Deprivation
Glutathione Reductase / blood
Humans
Magnesium / blood
Male
Martial Arts
Minerals / blood
Nutrition Assessment
Nutritional Physiological Phenomena / physiology*
Nutritional Status / physiology
Physical Fitness*
Psychomotor Performance
Pyridoxine / blood,  metabolism
Sports*
Time Factors
Transketolase / blood
Vitamins / blood
Water Deprivation
Weight Gain
Weight Loss / physiology*
Wrestling
Chemical
Reg. No./Substance:
0/Dietary Carbohydrates; 0/Minerals; 0/Vitamins; 65-23-6/Pyridoxine; 7439-95-4/Magnesium; EC 1.8.1.7/Glutathione Reductase; EC 2.2.1.1/Transketolase; EC 2.6.1.1/Aspartate Aminotransferases

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine


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