Hydration status: effects on physiology and metabolism – Cátedra Internacional de Estudios Avanzados en Hidratación

Significant and serious dehydration does not affect skeletal muscle cramp threshold frequency.

OBJECTIVE: Many clinicians believe that exercise-associated muscle cramps (EAMC) occur because of dehydration. Experimental research supporting this theory is lacking. Mild hypohydration (3% body mass loss) does not alter threshold frequency (TF), a measure of cramp susceptibility, when fatigue and exercise intensity are controlled. No experimental research has examined TF following significant (3-5% body mass [...]

By CIEAH - ICASH|2017-05-21T03:14:22+00:00julio 15th, 2013|Documentos científicos, Hydration status: effects on physiology and metabolism|Comentarios desactivados

Influence of progressive fluid restriction on mood and physiological markers of dehydration in women

The present study evaluated, using a well-controlled dehydration protocol, the effects of 24 h fluid deprivation (FD) on selected mood and physiological parameters. In the present cross-over study, twenty healthy women (age 25 (se 0·78) years) participated in two randomised sessions: FD-induced dehydration v. a fully hydrated control condition. In the FD period, the last [...]

By CIEAH - ICASH|2017-05-21T03:14:22+00:00junio 20th, 2013|Documentos científicos, Hydration status: effects on physiology and metabolism, Mental performance, Physical performance|Comentarios desactivados

Effect of maternal hydration on the amniotic fluid volume during maternal rest in the left lateral decubitus position: a randomized prospective study.

Objectives- The purpose of this study was to evaluate the effect of maternal hydration on amniotic fluid volume during maternal rest in the left lateral decubitus position. Methods- Pregnant women (n = 79) with an amniotic fluid index between 6 and 24 cm and a singleton uncomplicated pregnancy at 35 to 40 weeks' gestation were [...]

By CIEAH - ICASH|2017-05-21T03:15:31+00:00junio 20th, 2013|Assessment methodologies, Body water content; body composition, Documentos científicos, Hydration status: effects on physiology and metabolism, Pregnancy and infancy|Comentarios desactivados

Increase in skeletal-muscle glycogenolysis and perceived exertion with progressive dehydration during cycling in hydrated men.

This study investigated the effects of progressive mild dehydration during cycling on whole-body substrate oxidation and skeletal-muscle metabolism in recreationally active men. Subjects (N = 9) cycled for 120 min at ~65% peak oxygen uptake (VO2peak 22.7 °C, 32% relative humidity) with water to replace sweat losses (HYD) or without fluid (DEH). Blood samples were [...]

By CIEAH - ICASH|2017-05-21T03:15:31+00:00junio 20th, 2013|Documentos científicos, Exercise and sport, Hydration status: effects on physiology and metabolism|Comentarios desactivados

Ad libitum fluid intake does not prevent dehydration in suboptimally hydrated young soccer players during a training session of a summer camp.

There is a lack of studies concerning hydration status of young athletes exercising in the heat. Purpose: To assess preexercise hydration status in young soccer players during a summer sports camp and to evaluate body-water balance after soccer training sessions. Methods: Initial hydration status was assessed in 107 young male soccer players (age 11-16 yr) [...]

By CIEAH - ICASH|2017-05-21T03:15:32+00:00junio 20th, 2013|Documentos científicos, Exercise and sport, Hydration status: effects on physiology and metabolism, Physical performance|Comentarios desactivados

Effect of preexercise soup ingestion on water intake and fluid balance during exercise in the heat.

Purpose: To determine whether chicken noodle soup before exercise increases ad libitum water intake, fluid balance, and physical and cognitive performance compared with water. Methods: Nine trained men (age 25 ± 3 yr, VO2peak 54.2 ± 5.1 ml • kg-1 • min-1; M ± SD) performed cycle exercise in the heat (wet bulb globe temperature [...]

By CIEAH - ICASH|2017-05-21T03:15:32+00:00junio 20th, 2013|Documentos científicos, Exercise and sport, Hydration status: effects on physiology and metabolism, Physical performance|Comentarios desactivados

Markers of Hydration Status in a 3-Day Trail Running Event

OBJECTIVE: To examine the relationships between changes in static prestage and poststage measures of commonly used hematological and urinary markers of hydration status and body mass (BM) in participants in a 3-day trail run. DESIGN: Descriptive field study. SETTING: Three Cranes Challenge trail run, South Africa. PARTICIPANTS: Twenty (6 men and 14 women) amateur runners. [...]

By CIEAH - ICASH|2017-05-21T03:16:05+00:00mayo 17th, 2013|Documentos científicos, Hydration status: effects on physiology and metabolism, Water balance|Comentarios desactivados

Evaluation of Uosm:Posm ratio as a hydration biomarker in free-living, healthy young women

BACKGROUND/OBJECTIVES: Urinary and plasma indices are utilized to assess whole-body water balance in healthy adults, whereas the urine-to-plasma osmolality ratio (Uosm:Posm) rarely is. To explore the efficacy of Uosm:Posm as a hydration biomarker, diet records of 120 college women were analyzed (beverage water+food water=total fluid intake (TFI); 5 days) to identify habitual high-volume (HIGH) and [...]

By CIEAH - ICASH|2017-05-21T03:16:05+00:00mayo 16th, 2013|Documentos científicos, Hydration status: effects on physiology and metabolism|Comentarios desactivados

Circadian variation and responsiveness of hydration biomarkers to changes in daily water intake

Biomarkers of hydration change in response to acute dehydration; however, their responsiveness to changes in fluid intake volume, without exercise or heat exposure, has not been adequately described. Moreover, patterns of circadian variation in hydration biomarkers have not been established. The study aims were to (1) assess the response of hydration biomarkers to changes in [...]

By CIEAH - ICASH|2017-05-21T03:16:06+00:00mayo 16th, 2013|Documentos científicos, Hydration status: effects on physiology and metabolism|Comentarios desactivados

The acute effects of fluid intake on urine specific gravity and fluid retention in a mildly dehydrated state.

Logan-Sprenger, HM and Spriet, LL. The acute effects of fluid intake on urine specific gravity and fluid retention in a mildly dehydrated state. J Strength Cond Res 27(4): 1002-1008, 2013-Many athletes arrive at training sessions and competitions in a mildly hypohydrated (HYPO) state and are instructed to drink fluids before exercise to reach a euhydrated [...]

By CIEAH - ICASH|2017-05-21T03:16:35+00:00abril 26th, 2013|Documentos científicos, Hydration status: effects on physiology and metabolism, Regulation of water and electrolyte balance|Comentarios desactivados