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Urinary and/or serum concentrations of electrolytes (sodium, potassium, calcium, magnesium), hormones (aldosterone, cortisol, catecholamines), and metabolic parameters (lactate, glucose, free fatty acids) were determined during different volleyball matches. While Na+s was slightly increased-not exceeding the hemo-concentration effect-K+s, and Ca2+s were diminished after the matches. Due to a lowered glomerular filtration rate (GFR), urinary excretion of water, sodium, and potassium was decreased. In addition, the tubular resorption and secretion of fluid and electrolytes was influenced by different hormones leading to a lowered Na+u and an increase of K+u after exercise. Low concentrations of lactate (2.54 +/- 1.21 mmol/l) during and after the matches and an increase of FFAs indicate that energy during the short exercise periods (9 s) is mainly supplied by a breakdown of creatine phosphate, while aerobic pathways restore the energy sources during the resting periods (12 s). Serum concentrations of aldosterone and cortisol as well as the excretion of adrenaline are enhanced on the same scale as after endurance sports. The excretion of noradrenaline corresponds to values during exercise of high intensity.
Künstlinger et al. (Thu,) studied this question.