A prospective study of exercise-associated hyponatremia in two ultradistance triathletes
Deutscher übersetzter Titel: | Eine Prospektivstudie an zwei Ultradistanz-Triathleten zur belastungsinduzierten Hyponatriaemie |
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Autor: | Speedy, D.B.; Noakes, T.D.; Rogers, I.R.; Hellemans, I.; Kimber, N.E.; Boswell, D.R.; Campbell, R.; Kuttner, J.A. |
Erschienen in: | Clinical journal of sport medicine |
Veröffentlicht: | 10 (2000), 2, S. 136-141, Lit. |
Format: | Literatur (SPOLIT) |
Publikationstyp: | Zeitschriftenartikel |
Medienart: | Gedruckte Ressource |
Sprache: | Englisch |
ISSN: | 1050-642X, 1536-3724 |
Schlagworte: | |
Online Zugang: | |
Erfassungsnummer: | PU199912406784 |
Quelle: | BISp |
Abstract des Autors
Objective: To study fluid and sodium balance in two ultradistance triathletes. Design: Prospective case study. Setting: An ultradistance triathlon (3.8 km swim, 180 km cycle, 42.2 km run), and during overnight recovery. Ambient air temperature at 12:00 p.m. race day was 21øC, with a relative humidity of 91%. Water temperature was 20.7øC. Subjects: Two female ultradistance triathletes, ages 30 and 39 years, who were participating in a larger study investigating weight and electrolyte changes in the Ironman triathlon. Interventions: None. Main Outcome Measures: Subjects were weighed and had blood drawn for serum sodium concentration, hemoglobin, hematocrit, arginine vasopressin, and aldosterone concentration prior to and after the race, and at 8:00 a.m. the following morning. Sodium and fluid intake and urinary output were measured during recovery. Results: Both subjects developed mild hyponatremia (Na 131 and 130 mmol/L) during the race, with a weight gain (0.5 and 1.5 kg). Neither subject had large sodium losses (24 mmol and 20 mmol). Fluid consumption was 733 ml/h and 764 ml/h. Plasma volume increased during the race (25 and 16%). Arginine vasopressin (AVP) levels were not elevated in either subject (1.2 and 1.9 pmoI/L). Both subjects demonstrated a water excess during the race (1.5 and 2.5 L), and lost weight during recovery (2.0 and 4.5 kg). Conclusions: Hyponatremia resulted from fluid retention in the extracellular space, without evidence of large sodium losses or inappropriate AVP secretion. Verf.-Referat