title: The effect of hydration status on appetite and energy intake.
abstract: This study investigated the effect of hypohydration produced by exercise and sub-optimal rehydration on appetite and energy intake. Ten males lost ~2% body mass through evening exercise in the heat (35°C). Over the next 13 h, participants were re-fed and either rehydrated (RE: water equal to 175% of body mass loss (BML)) or remained hypohydrated (HYPO: 200 ml water), until the following morning. Urine samples, blood samples and subjective feelings were collected pre-exercise, post-exercise and 13 h post-exercise, with an ad libitum breakfast provided 13 h post-exercise. Total BML at 13 h post-exercise was greater during HYPO (2.8 (0.5)%) than RE (0.5 (0.5)%). Energy intake at the ad libitum breakfast was similar between trials (RE: 4237 (1459) kJ; HYPO: 4612 (1487) kJ; P = 0.436), with no difference in energy consumed in foods (P = 0.600) or drinks (P = 0.147). Total water ingestion at the ad libitum breakfast meal was greater during HYPO (1641 (367) ml) than RE (797 (275) ml) (P < 0.001), with this being explained by increased water intake through fluids (P < 0.001). Thirteen hours post-exercise, participants reported greater thirst (P < 0.001) and lower fullness (P < 0.01) during HYPO. Alterations in hydration status produced by exercise are unlikely to influence post-exercise food intake and consequently other aspects of recovery or adaptation.
authors.affiliation: a School of Sport, Exercise and Health Sciences , Loughborough University , Loughborough , UK.
authors.forename: Robert Anthony
authors.initials: RA
authors.lastname: Corney
authors.forename: Caroline
authors.initials: C
authors.lastname: Sunderland
authors.forename: Lewis John
authors.initials: LJ
authors.lastname: James
mesh_terms: D001066:Appetite / Q000502:physiology*; D015992:Body Mass Index; D004326:Drinking / Q000502:physiology*; D002149:Energy Intake / Q000502:physiology*; D015444:Exercise / Q000502:physiology*; D005440:Fluid Therapy; D054439:Ghrelin / Q000097:blood; D006358:Hot Temperature; D006801:Humans; D006815:Hunger / Q000502:physiology; D008297:Male; D009994:Osmolar Concentration; D010953:Plasma Volume; D013894:Thirst / Q000502:physiology; D014556:Urine / Q000502:physiology; D055815:Young Adult
chemical_list: D054439:Ghrelin
keywords: dehydration; energy balance; fluid balance; hypohydration; recovery