When
utilized separately, pre-exercise hyperhydration or consumption of caffeine
have both been shown to be ergogenic. Acute caffeine consumption has also been
shown to promote diuresis in some situations, but this effect has not been
studied when caffeine is used in conjunction with sodium-aided hyperhydration.
We measured urine production during hyperhydration strategies performed with
and without caffeine. Fifteen euhydrated subjects performed five strategies by consuming 20 mL water/kg bm alone (NT), or with a placebo (PL), 5 mg/kg bm
caffeine (Caf), 110 mg/kg bm NaCl (Na), or 5 mg caffeine +110 mg NaCl/kg bm
(CafNa). Total urine excretion was measured for 2 h following treatment
consumption and expressed as a percentage of the total water consumed. Total
twohour urine excretion values were 103 16% (NT), 102 15% (PL), 116 18% (Caf),
68 14% (Na) and 85 14% (CafNa) of water consumed.
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