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From Fellrnr.com, Running tips
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While some sources suggest that increased fitness reduces the sodium concentration in sweat research<ref name="training"/> shows this is not the case. For both trained and untrained individuals sodium concentration depends mainly on sweat rate. In fact, for a given relative intensity (% of [[VO2max|V̇O<sub>2</sub>max]]) trained individuals will be performing a greater absolute work rate and therefore have a greater sweat rate and sodium concentration.
[[File:Sodium in sweat trained and untrained.jpg|none|thumb|300px|Sweat sodium concentration against sweating great, showing for three different work intensities and for trained and untrained individuals.]]
==Sodium Loss and Heat Acclimation==
A study shows that the sodium concentration of sweat is reduced by heat acclimation training. The study used three bouts of 30 min. of exercise in environmental chamber with 10 min. of rest between each bout.
[[File:Sweat Rate Sodium Concentration for heat adaptation.jpg|none|thumb|300px|Sweat sodium concentration against sweating great, before and after 10 days of heat acclimation training.]]
==Sodium Loss and Skin Temperature==
A study<ref name="skintemp"/> of sweating great sodium concentration for different temperatures has shown that sodium reabsorption is greater at high temperatures. The mechanism behind this is unclear.
