Table 3.

Changes of hydration variables measured in the WCS

	Crystal Light (C)	Gatorade (G)	Infinit (INW)
USG pre (AU)	1.020 ± 0.003	1.020 ± 0.002	1.018 ± 0.002
USG post (AU)c	1.015 ± 0.006	1.007 ± 0.002	1.014 ± 0.002
Change in body mass (kg)	0.3 ± 0.1	0.4 ± 0.2	0.3 ± 0.2
Change in hemoglobin (%)+	−4.1 ± 1.5	−7.5 ± 1.6	−4.5 ± 3.0b
Change in plasma volume (%)+	1.3 ± 0.28	1.7 ± 0.33	1.5 ± 0.82
Sweat rate (mL.h-1)	510.1 [20.9 -841.1]	597.3 [401.1 – 848.0]	727.2 [456.2-849.0]
Sodium intake (g)*	0	1.2 [1.1 – 1.2]	4.7 [4.4 – 4.7]
Sodium loss (g)	3.1 [0.94 – 5.9]	3.7 [2.0 – 5.8]	4.9 [2.0 – 7.4]
Sodium balance (g)	−3.1 [−4.4 – 0.94]	−2.5 [2.9 - -0.77]	−0.23 [−1.2 – 2.7]a

* - All groups are significantly different from each other (p < 0.001). a – Significantly different from Crystal Light (p = 0.022). + Main effect for time indicating that there was an increase in plasma volume in all groups following training (p < 0.001). b – Significantly different from pre-training (p < 0.05). c – different from pre-training USG with a main effect for time (p = 0.003).

Values are shown as the mean (range) for each condition.