Intra-Individual Variability in Sweating Rate and Sweat Sodium Concentration with Changes in Exercise Intensity

2016 ◽  
Vol 48 ◽  
pp. 171-172
Author(s):  
Ryan P. Nuccio ◽  
Corey T. Ungaro ◽  
Adam J. Reimel ◽  
Kelly A. Barnes ◽  
Bridget C. Sopeňa ◽  
...  
Keyword(s):  
Exercise Intensity ◽  
Sodium Concentration ◽  
Individual Variability ◽  
Sweating Rate ◽  
Sweat Sodium Concentration ◽  
Sweat Sodium

scholarly journals Normative data for sweating rate, sweat sodium concentration, and sweat sodium loss in athletes: An update and analysis by sport

2019 ◽  
Vol 37 (20) ◽  
pp. 2356-2366 ◽  
Author(s):  
Kelly A. Barnes ◽  
Melissa L. Anderson ◽  
John R. Stofan ◽  
Kortney J. Dalrymple ◽  
Adam J. Reimel ◽  
...  
Keyword(s):  
Normative Data ◽  
Sodium Concentration ◽  
Sweating Rate ◽  
Sodium Loss ◽  
Sweat Sodium Concentration ◽  
Sweat Sodium

Relation between Regional and Whole Body Sweat Sodium Concentration and the Effect of Exercise Intensity

2018 ◽  
Vol 50 (5S) ◽  
pp. 620
Author(s):  
Lindsay B. Baker ◽  
Corey T. Ungaro ◽  
Bridget C. Sopeña ◽  
Ryan P. Nuccio ◽  
Adam J. Reimel ◽  
...  
Keyword(s):  
Exercise Intensity ◽  
Sodium Concentration ◽  
Whole Body ◽  
Sweat Sodium Concentration ◽  
Sweat Sodium

Normative data for regional sweat sodium concentration and whole-body sweating rate in athletes

2015 ◽  
Vol 34 (4) ◽  
pp. 358-368 ◽  
Author(s):  
Lindsay B. Baker ◽  
Kelly A. Barnes ◽  
Melissa L. Anderson ◽  
Dennis H. Passe ◽  
John R. Stofan
Keyword(s):  
Normative Data ◽  
Sodium Concentration ◽  
Whole Body ◽  
Sweating Rate ◽  
Sweat Sodium Concentration ◽  
Sweat Sodium

Sweat sodium concentration during exercise in the heat in aerobically trained and untrained humans

2011 ◽  
Vol 111 (11) ◽  
pp. 2873-2881 ◽  
Author(s):  
Nassim Hamouti ◽  
Juan Del Coso ◽  
Juan F. Ortega ◽  
Ricardo Mora-Rodriguez
Keyword(s):  
Sodium Concentration ◽  
Sweat Sodium Concentration ◽  
Sweat Sodium ◽  
Aerobically Trained

Sweat Sodium Concentration in NFL Players during Dietary Sodium Supplementation compared to when they are not Supplemented

2008 ◽  
Vol 40 (Supplement) ◽  
pp. S86 ◽  
Author(s):  
Arthur R. Bartolozzi ◽  
Sandra Fowkes Godek ◽  
Chris Peduzzi ◽  
Jason Kopec ◽  
Richard Burkholder
Keyword(s):  
Sodium Concentration ◽  
Dietary Sodium ◽  
Sweat Sodium Concentration ◽  
Sweat Sodium ◽  
Sodium Supplementation

Variability of Measurements of Sweat Sodium Using the Regional Absorbent-Patch Method

2014 ◽  
Vol 9 (5) ◽  
pp. 832-838 ◽  
Author(s):  
Christine E. Dziedzic ◽  
Megan L. Ross ◽  
Gary J. Slater ◽  
Louise M. Burke
Keyword(s):  
Analytical Techniques ◽  
Sodium Concentration ◽  
Whole Body ◽  
Single Measure ◽  
Mean Values ◽  
Analytical Technique ◽  
Significant Difference ◽  
The Impact ◽  
Sweat Sodium Concentration ◽  
Sweat Sodium

Context: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 2 standardized cycling time trials in the heat and 2 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 reanalysis 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= .0032). A significant difference (P= .0048) in estimates of sweat sodium concentration was evident when calculated from the forearm average (mean ± 95% CL; 64 ± 12 mmol/L) compared with using a 4-site equation (70 ± 12 mmol/L). There was a high correlation between the values produced using different analytical techniques (r2= .95), but mean values were different between treatments (frozen FP, frozen SC > immediate ISE > frozen ISE;P< .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.

Water Balance and Salt Losses in Competitive Football

2007 ◽  
Vol 17 (6) ◽  
pp. 583-594 ◽  
Author(s):  
Ronald J. Maughan ◽  
Phillip Watson ◽  
Gethin H. Evans ◽  
Nicholas Broad ◽  
Susan M. Shirreffs
Keyword(s):  
Urine Osmolality ◽  
Sodium Concentration ◽  
Individual Variability ◽  
Fluid Replacement ◽  
Hydration Status ◽  
Large Individual ◽  
Cool Environment ◽  
Football Match ◽  
Before And After ◽  
Sweat Sodium

Fluid balance and sweat electrolyte losses were measured in the players and substitutes engaged in an English Premier League Reserve competitive football match played at an ambient temperature of 6–8 °C (relative humidity 50–60%). Intake of water and/or sports drink and urine output were recorded, and sweat composition was estimated from absorbent swabs applied to 4 skin sites for the duration of the game. Body mass was recorded before and after the game. Data were obtained for 22 players (age 21 y, height 180 cm, mass 78 kg) and 9 substitutes (17 y, 181 cm, 72 kg). All were male. Two of the players were dismissed during the game, and none of the substitutes played any part in the game. Mean ± SD sweat loss of players amounted to 1.68 ± 0.40 L, and mean fluid intake was 0.84 ± 0.47 L (n = 20), with no difference between teams. Corresponding values for substitutes, none of whom played in the match, were 0.40 ± 0.24 L and 0.78 ± 0.46 L (n = 9). Prematch urine osmolality was 678 ± 344 mOsm/kg: 11 of the 31 players provided samples with an osmolality of more than 900 mOsm/kg. Sweat sodium concentration was 62 ± 13 mmol/L, and total sweat sodium loss during the game was 2.4 ± 0.8 g. These descriptive data show a large individual variability in hydration status, sweat losses, and drinking behaviors in a competitive football match played in a cool environment, highlighting the need for individualized assessment of hydration status to optimize fluid-replacement strategies.

scholarly journals Heat acclimation improves sweat gland function and lowers sweat sodium concentration in an adult with cystic fibrosis

2020 ◽  
Author(s):  
Ashley G.B. Willmott ◽  
Robert Holliss ◽  
Zoe Saynor ◽  
Jo Corbett ◽  
Adam J. Causer ◽  
...  
Keyword(s):  
Cystic Fibrosis ◽  
Sweat Gland ◽  
Heat Acclimation ◽  
Sodium Concentration ◽  
Gland Function ◽  
Sweat Sodium Concentration ◽  
Sweat Sodium
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