title: Voluntary drinking behaviour, fluid balance and psychological affect when ingesting water or a carbohydrate-electrolyte solution during exercise.
abstract: This study investigated the effects of drink composition on voluntary intake, hydration status, selected physiological responses and affective states during simulated gymnasium-based exercise. In a randomised counterbalanced design, 12 physically active adults performed three 20-min intervals of cardiovascular exercise at 75% heart rate maximum, one 20-min period of resistance exercise and 20 min of recovery with ad libitum access to water (W), a carbohydrate-electrolyte solution (CES) or with no access to fluids (NF). Fluid intake was greater with CES than W (1706±157 vs. 1171±152 mL; P<0.01) and more adequate hydration was achieved in CES trials (NF vs. W vs. CES: -1668±73 vs. -700±99 vs. -273±78 g; P<0.01). Plasma glucose concentrations were highest with CES (CES vs. NF vs. W: 4.26±0.12 vs. 4.06±0.08 vs. 3.97±0.10 mmol/L; P<0.05). Pleasure ratings were better maintained with ad libitum intake of CES (CES vs. NF vs. W: 2.72±0.23 vs. 1.09±0.20 vs. 1.74±0.33; P<0.01). Under conditions of voluntary drinking, CES resulted in more adequate hydration and a better maintenance of affective states than W or NF during gymnasium-based exercise.
authors: Sport, Health and Exercise Science Research Group, Department for Health, University of Bath, Bath BA2 7AY, United Kingdom. O.J.Peacock@bath.ac.uk
authors: Oliver J
authors: OJ
authors: Peacock
authors: Dylan
authors: D
authors: Thompson
authors: Keith A
authors: KA
authors: Stokes
mesh_terms: D000328:Adult; D001786:Blood Glucose / Q000032:analysis; D004040:Dietary Carbohydrates / Q000008:administration & dosage*; D004311:Double-Blind Method; D004327:Drinking Behavior; D004573:Electrolytes / Q000008:administration & dosage*; D015444:Exercise / Q000502:physiology* / Q000523:psychology*; D006801:Humans; D008297:Male; D015532:Rehydration Solutions / Q000008:administration & dosage; D014867:Water; D014882:Water-Electrolyte Balance; D055815:Young Adult
chemical_list: D001786:Blood Glucose; D004040:Dietary Carbohydrates; D004573:Electrolytes; D015532:Rehydration Solutions; D014867:Water