Abstract
Little definitive information is available on the behavioral effects of dehydration. This study assessed effects of mild dehydration on cognitive performance and mood of healthy females, without hyperthermia. Healthy, active women (N=25; mean ± SD age, 23.0 ± 0.6 y; using oral contraceptives) participated in 3 placebo‐controlled, randomized, single‐blinded, repeated measure trials (9.8 h each) in 3 hydration states: exercise dehydration (D; three 40‐min treadmill walks at 5.6 km·h−1, 5% grade, 28°C); D plus diuretic ingestion (D+F; furosemide, 40 mg); and control (CON; exercise, weight maintained by water intake). A comprehensive 6‐task cognitive test battery (CTB), Profile of Mood States questionnaire (POMS) and visual analog scales (VAS) were administered. Paired t‐tests compared CON (0.12 ± 0.06%) to all D and D+F trials that resulted in ≥1% (1.39 ± 0.30%) body mass loss. Differences (P<.05, CON versus D or D+F) existed at rest and during exercise for POMS (total mood disturbance, tension, vigor, fatigue, confusion) and VAS (task difficulty, concentration, headache). No differences in the CTB were observed. In conclusion, ratings of task difficulty, concentration and headache, as well as mood states were degraded by mild dehydration of 1.39% but cognitive performance was not. Funded by Danone Research, France.
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