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Table 4 Measures of fluid balance

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

  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 changea −0.6 ± 34.2 20.0 ± 23.0 0.17
  1. apost-pre, difference in subjective score out of 100; * P < 0.05.
  2. 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.