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Effects of different periods of rapid weight loss on dehydration and oxidative stress

Journal article
Authors M. Nishimaki
H. Tabata
M. Konishi
Stefan Pettersson
S. Sakamoto
V. Ps Stralia
Published in Archives of Budo
Volume 14
Pages 319-327
ISSN 1643-8698
Publication year 2018
Published at Department of Food and Nutrition, and Sport Science
Pages 319-327
Language en
Links archbudo.com/view/abstract/id/12290
Keywords aldosterone, dehydration, body composition, oxidative stress, rapid weight loss, fluid replacement, aldosterone, blood, antioxidants, reduction, wrestlers, sports, regain, Sport Sciences, gelholm m, 1994, sports medicine, v18, p249, een sn, 1990, medicine and science in sports and exercise, v22, p762
Subject categories Sport and Fitness Sciences

Abstract

Background and Study Aim: Many athletes will lose weight 5% or more within 7 days. Many reports have been published on the negative health effects of rapid weight loss (RWL) in wrestlers. This study aim was the effects of different periods of RWL on dehydration state and oxidative stress. Materials and Methods: Participants were nine male collegiate wrestlers who reduce their body mass by 5% within short period in randomized order using the same methods. They have experienced 1-day, 3-days and 7-days) weight loss separated by more than 4 weeks. All participants reduced 5% of their body mass in all trials. Following the weight loss, they tried to regain all of their lost weight with an ad libitum diet for 14 h. Body composition and biochemical variables were measured at baseline and immediately after weight loss and weight regain. Results: There were no statistically significant differences in hematocrit, serum sodium, chloride, potassium, calcium, osmotic pressure, and antidiuretic hormone. For plasma aldosterone concentrations and plasma d-ROMs concentrations, two-way analysis of variance revealed the main effect of time (p<0.05). RWL (loss of 5% of body weight within 7 days) is surmised to have increased oxidative stress via dehydration and elevated levels of aldosterone. Conclusions: Although different weight loss periods did not yield any changes, RWL of 5% of body weight was suggested to increase oxidative stress. It is necessary to study the influence of weight loss cycling on athlete's disease risk in the future.

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