Document Detail

Fluid and electrolyte balance during two different pre-season training sessions in elite rugby union players.
MedLine Citation:
PMID:  23669819     Owner:  NLM     Status:  Publisher    
The purpose of this study was to compare fluid balance between a resistance and aerobic training session, in elite rugby players. It is hypothesised that resistance exercise will result in a higher prevalence of over-drinking whereas during the aerobic session under-drinking will be more prevalent.As with previous fluid balance studies, this was an observational study. Twenty-six players completed the resistance training session and twenty players completed the aerobic training session. All players were members of an elite rugby union squad competing in the southern hemisphere's premier competition. For both sessions players provided a pre-exercise urine sample to determine hydration status, pre- and post-exercise measures of body mass and blood sodium concentration were taken and the weight of drinks bottles were recorded to calculate sweat rates and fluid intake rates. Sweat patches were positioned on the shoulder of the players and these remained in place throughout each training session,and were later analysed for sodium concentration.The percentage of sweat loss replaced was higher in the resistance (196 ± 130%) than the aerobic training session (56 ± 17%; P=0.002). Despite this, no cases of hyponatremia were detected. The results also indicated that over 80% of players started training in a hypohydrated state.Fluid intake appears to differ depending on the nature of the exercise session. In this group of athletes, players did not match their fluid intakes with their sweat loss, resulting in over-drinking during resistance training and under-drinking in aerobic training. Therefore, hydration strategies and education need to be tailored to the exercise session. Furthermore, given the large number of players arriving at training hypohydrated, improved hydration strategies away from the training venue are required.
Samuel D Cosgrove; Thomas D Love; Rachel C Brown; Dane F Baker; Anna S Howe; Katherine E Black
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Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2013-5-9
Journal Detail:
Title:  Journal of strength and conditioning research / National Strength & Conditioning Association     Volume:  -     ISSN:  1533-4287     ISO Abbreviation:  J Strength Cond Res     Publication Date:  2013 May 
Date Detail:
Created Date:  2013-5-14     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  9415084     Medline TA:  J Strength Cond Res     Country:  -    
Other Details:
Languages:  ENG     Pagination:  -     Citation Subset:  -    
1Department of Human Nutrition, University of Otago, Dunedin, New Zealand. 2Applied Sports Technology Exercise and Medicine Research Centre (A-STEM), Sport & Exercise Science, Swansea University, United Kingdom. 3Chiefs Super Rugby Franchise, Waikato, New Zealand.
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