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Caffeine-induced rises in blood sodium concentration during exercise
Bassini, A. 1; Bottino, A.1; Sweet, E.W.S.3; Bittar, C4.; Veiga, C. & Cameron, L.C.1,2,5
1Laboratório de Bioquímica de Proteínas – Universidade Federal do Estado do Rio de Janeiro; 2PROCIMH – Universidade Castelo Branco; 3Departamento de Anatomia – Universidade Federal do Rio de Janeiro; 4Laboratório Bittar; 5 Instituto de Genética e Bioquímica - Universidade Federal de Uberlândia.
Caffeine increases the central nervous system activities leading to several effects in metabolism. The xantine is used as an ergogenic resource due to its action in reaction time velocity and perception. We studied its effects on main plasmatic ions concentration of soccer players receiving water and electrolytes ad libitum, since caffeine has a well described the effect on diuresis and blood ion concentration. In order to assess the metabolic integrity, the subjects had a food and activities (training, rest and sleep) controlled protocol. The athletes were also clinically and biochemically studied before experimental procedures. Our results showed an increase in phosphorus and chloride blood concentration in response to exercise, with no changes in kalemia. There was a raise in blood sodium concentration in response to caffeine leading us to conclude that the xantine leads to a sodium conservation probably linked to aldosterone.
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