Journal article
The Effect of Water Loading on Acute Weight Loss Following Fluid Restriction in Combat Sports Athletes
International Journal of Sport Nutrition and Exercise Metabolism, Vol.28(6), pp.565-573
2018
PMID: 29182412
Abstract
Novel methods of acute weight loss practiced by combat sport athletes include 'water loading'; the consumption of large fluid volumes for several days prior to restriction. We examined claims this technique increases total body water losses, while also assessing the risk of hyponatremia. Male athletes were separated into control (CON, n=10) and water loading (WL, n=11) groups and fed a standardised energy-matched diet for 6 days. Day 1-3 fluid intake was 40 mL. kg-1 and 100 mL. kg-1 for CON and WL, respectively with both groups consuming 15 mL. kg-1on Day 4 and following the same rehydration protocol on Days 5-6. We tracked body mass (BM), urine sodium, specific gravity (USG) and volume, training-related sweat losses and blood concentrations of renal hormones and urea and electrolytes (U+Es) throughout. Physical performance was assessed pre-and post-intervention. Following fluid restriction, there were substantial differences between groups in the ratio of fluid input/output (39%, p < 0.01, ES=1.2) and BM loss (0.6%BM, p=0.02, ES=0.82). Changes in USG, U+Es and renal hormones occurred over time (p < 0.05), with an interaction of time and intervention on blood sodium, potassium, chloride, urea, creatinine, USG and vasopressin (p < 0.05). Measurements of U+E remained within reference ranges and no differences in physical performance were detected over time or between groups. Water loading appears to be a safe and effective method of acute BM loss under the conditions of this study. Vasopressin regulated changes in aquaporin channels may potentially partially explain the mechanism of increased body water loss with water loading.
Details
- Title
- The Effect of Water Loading on Acute Weight Loss Following Fluid Restriction in Combat Sports Athletes
- Authors
- Reid James Reale (Author) - University of the Sunshine Coast - Faculty of Science, Health, Education and EngineeringGary J Slater (Author) - University of the Sunshine Coast - Faculty of Science, Health, Education and EngineeringGregory R Cox (Author) - University of the Sunshine Coast - Faculty of Science, Health, Education and EngineeringIan C Dunican (Author) - University of Western AustraliaLouise M Burke (Author) - Australian Catholic University
- Publication details
- International Journal of Sport Nutrition and Exercise Metabolism, Vol.28(6), pp.565-573
- Publisher
- Human Kinetics
- Date published
- 2018
- DOI
- 10.1123/ijsnem.2017-0183
- ISSN
- 1526-484X; 1543-2742
- PMID
- 29182412
- Copyright note
- Copyright © 2018 The Author. This manuscript is as accepted for publication in the International Journal of Sport Nutrition & Excersie Metabolism, Vol 28, No. 6. The definitive version is available at: http://dx.doi.org/10.1123/ijsnem.2017-0183
- Organisation Unit
- University of the Sunshine Coast, Queensland; School of Health - Nutrition & Dietetics; School of Health and Sport Sciences - Legacy; School of Health and Behavioural Sciences - Legacy
- Language
- English
- Record Identifier
- 99450431702621
- Output Type
- Journal article
Metrics
520 File views/ downloads
880 Record Views
InCites Highlights
These are selected metrics from InCites Benchmarking & Analytics tool, related to this output
- Collaboration types
- Domestic collaboration
- Web Of Science research areas
- Nutrition & Dietetics
- Sport Sciences
UN Sustainable Development Goals (SDGs)
This output has contributed to the advancement of the following goals:
Source: InCites