Table 2.

Changes in Hydration-Related Variables

Variables	YF (n = 17)		OF (n = 9)		Main effects
	BH	MH	BH	MH	Age	Cond	Age*Cond
Thirst	2.4±2.5	6.6±2.5	2.4±1.5	6.6±2.3	0.98	<0.001	0.95
Body Mass (kg)	59.1±10.3	59.0±10.2	58.6±8.1	58.0±8.4	0.86	0.13	0.16
CH2O (mL/min)	−0.53±0.50	−1.29±0.97	−0.48±0.29	−0.73±0.14	0.20	0.001	0.08
Spot USG	1.015±0.006	1.022±0.004	1.012±0.006	1.022±0.004	0.54	<0.0001	0.41
24-hr USG	1.012±0.004	1.018±0.003	1.011±0.002	1.017±0.004	0.46	<0.0001	0.92
24-hr Urine Osmolality (mOsm/kg H2O)	462±132	681±127	436±88	669±158	0.71	<0.0001	0.75
Plasma Osmolality (mOsm/kg H2O)	287±5	290±5	297±4	300±4	<0.0001	<0.01	0.95
Urine Creatinine (mg/dL)	98±52	127±45	117±83	117±52	0.78	0.36	0.35
Serum Creatinine (mg/dL)	0.80±0.24	0.86±0.18	0.74±0.15	0.72±0.33	0.29	0.86	0.59
Urine Na+ (mmol/24hr)	149±103	121±49	111±35	98±28	0.16	0.28	0.71
Serum Na+ (mmol/L)	141.5±1.5	141.7±1.4	142.9±2.4	144.1±1.7	<0.01	0.18	0.35
Serum K+ (mmol/L)	4.0±0.3	4.0±0.3	4.2±0.5	4.0±0.4	0.43	0.46	0.42
Serum Cl− (mmol/L)	103.9±2.5	106.2±2.2a	106.7±1.8b	106.6±2.3	0.06	0.07	0.045

BH, baseline hydration condition; MH, mild hypohydration condition; CH₂O, free water clearance; USG, urine specific gravity.

^aDifferent from BL,

^bDifferent from YF