Journal article
Variability of Measurements of Sweat Sodium Using the Regional Absorbent Patch Method
International Journal of Sports Physiology and Performance, Vol.9(5), pp.832-838
2014
PMID: 24436351
Abstract
There is interest in including recommendations for the replacement of the sodium lost in sweat in individualized hydration plans for athletes. Purpose: Although the regional absorbent patch method provides a practical approach to measuring sweat sodium losses in field conditions, there is a need to understand the variability of estimates associated with this technique. Methods: Sweat samples were collected from the forearms, chest, scapula and thigh of 12 cyclists during two standardized cycling time trials in the heat, and two in temperate conditions. Single measure analysis of sodium concentration was conducted immediately by ion-selective electrodes (ISE). A subset of 30 samples was frozen for re-analysis of sodium concentration using ISE, flame photometry (FP) and conductivity (SC). Results: Sweat samples collected in hot conditions produced higher sweat sodium concentrations than those from the temperate environment (p=0.0032). A significant difference (p=0.0048) in estimates of sweat sodium concentration was evident when calculated from the forearm average (mean±95% CI; 64±12 mmol.L-1) compared to using a four-site equation (70±12 mmol.L-1). There was a high correlation between the values produced using different analytical techniques (r2=0.95), however mean values were different between treatments (frozen-FP, frozen-SC>ISE>frozen-ISE; p less than 0.0001). Conclusion: Whole-body sweat sodium concentration estimates differed depending on the number of sites included in the calculation. Environmental testing conditions should be considered in the interpretation of results. The impact of sample freezing and subsequent analytical technique was small but statistically significant. Nevertheless, when undertaken using a standardized protocol, the regional absorbent patch method appears to be a relatively robust field test.
Details
- Title
- Variability of Measurements of Sweat Sodium Using the Regional Absorbent Patch Method
- Authors
- Christine Dziedzic (Author) - University of the Sunshine Coast - Faculty of Science, Health, Education and EngineeringMegan L Ross (Author) - Australian Institute of SportGary J Slater (Author) - University of the Sunshine Coast - Faculty of Science, Health, Education and EngineeringLouise M Burke (Author) - Australian Institute of Sport
- Publication details
- International Journal of Sports Physiology and Performance, Vol.9(5), pp.832-838
- Publisher
- Human Kinetics
- Date published
- 2014
- DOI
- 10.1123/ijspp.2013-0480
- ISSN
- 1555-0265
- PMID
- 24436351
- Copyright note
- Copyright © 2014 Human Kinetics. Reproduced here in accordance with the publisher's copyright policy.
- 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
- 99448617102621
- Output Type
- Journal article
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