Sodium supplementation has no effect on endurance performance during a cycling time-trial in cool conditions: a randomised cross-over trial

Table 4 Measures of fluid balance

	Placebo	Sodium	P
Relative body mass change (%)	−1.04 ± 0.55	−0.99 ± 0.80	0.52
Relative plasma volume change (%)	−0.85 ± 1.83	1.78 ± 2.23	0.02*
Pre-race urine osmolality (mosmol^.L^-1)	509.9 ± 295.2	493.7 ± 263.7	0.91
Relative urine osmolality change (%)	31.5 ± 121.7	−6.1 ± 43.6	0.43
Fluid intake rate (mL^.h^-1)	268.9 ± 65.0	428.42 ± 166.3	0.01*
Thirst change^a	−0.6 ± 34.2	20.0 ± 23.0	0.17

^apost-pre, difference in subjective score out of 100; * P < 0.05.
Mean ± SD fluid balance variables: absolute (kg) and relative (%) body mass change, absolute (mL) and relative (mL^.h^-1) fluid intake, relative (%) hamatocrit change and pre-trial urine osmolality (mOsmol^.kg^-1) among athletes consuming sodium supplements and placebo.

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