Water and sodium intake habits and status of ultra-endurance runners during a multi-stage ultra-marathon conducted in a hot ambient environment: an observational field based study
| Autor: | Volker Scheer, Vera Camões-Costa, C.D. Thake, Ricardo Jose Da Costa, Jessica P Waterman, Ana Maria Teixeira, Benjamin Lee, Lisa D Hardy, Abigail J M Swancott, Andrew D. Murray, Luís Rama, Edel Barrett, Encarna Valero-Burgos, Samantha Kirsty Gill, Emily C Freeth, Joanne Hankey, Slawomir Marczak |
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| Jazyk: | angličtina |
| Předmět: |
Adult
Male medicine.medical_specialty Carbohydrate Sodium Body water Drinking chemistry.chemical_element Medicine (miscellaneous) lcsh:TX341-641 Urine Running Cohort Studies Beverages Animal science Blood serum Body Water Internal medicine Euhydration medicine Ingestion Humans Plasma Volume lcsh:RC620-627 Nutrition and Dietetics Dehydration business.industry Research Hyponatraemia Water Sodium Dietary Feeding Behavior Middle Aged Water-Electrolyte Balance Plasma osmolality lcsh:Nutritional diseases. Deficiency diseases Endocrinology chemistry Blood chemistry Asymptomatic Diseases Urine osmolality Physical Endurance Total body water Female business lcsh:Nutrition. Foods and food supply Hyponatremia |
| Zdroj: | Nutrition Journal Nutrition Journal, Vol 12, Iss 1, p 13 (2013) |
| ISSN: | 1475-2891 |
| DOI: | 10.1186/1475-2891-12-13 |
| Popis: | Background Anecdotal evidence suggests ultra-runners may not be consuming sufficient water through foods and fluids to maintenance euhydration, and present sub-optimal sodium intakes, throughout multi-stage ultra-marathon (MSUM) competitions in the heat. Subsequently, the aims were primarily to assess water and sodium intake habits of recreational ultra-runners during a five stage 225 km semi self-sufficient MSUM conducted in a hot ambient environment (Tmax range: 32°C to 40°C); simultaneously to monitor serum sodium concentration, and hydration status using multiple hydration assessment techniques. Methods Total daily, pre-stage, during running, and post-stage water and sodium ingestion of ultra-endurance runners (UER, n = 74) and control (CON, n = 12) through foods and fluids were recorded on Stages 1 to 4 by trained dietetic researchers using dietary recall interview technique, and analysed through dietary analysis software. Body mass (BM), hydration status, and serum sodium concentration were determined pre- and post-Stages 1 to 5. Results Water (overall mean (SD): total daily 7.7 (1.5) L/day, during running 732 (183) ml/h) and sodium (total daily 3.9 (1.3) g/day, during running 270 (151) mg/L) ingestion did not differ between stages in UER (p vs. CON). Exercise-induced BM loss was 2.4 (1.2)% (p p > 0.05 vs. CON pre-stage). Asymptomatic hyponatraemia (n = 8 UER, corresponding to 42% of sampled participants. Pre- and post-stage urine colour, urine osmolality and urine/plasma osmolality ratio increased (p p Conclusion Water intake habits of ultra-runners during MSUM conducted in hot ambient conditions appear to be sufficient to maintain baseline euhydration levels. However, fluid over-consumption behaviours were evident along competition, irrespective of running speed and gender. Normonatraemia was observed in the majority of ultra-runners throughout MSUM, despite sodium ingestion under benchmark recommendations. |
| Databáze: | OpenAIRE |
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