Sodium-facilitated hypervolemia, endurance performance, and thermoregulation
| Autor: | M. J. Luetkemeier, M. G. Coles |
|---|---|
| Rok vydání: | 2005 |
| Předmět: |
Adult
Male medicine.medical_specialty Sodium chemistry.chemical_element Physical Therapy Sports Therapy and Rehabilitation Physical exercise Animal science Time trial Internal medicine medicine Ingestion Humans Orthopedics and Sports Medicine Single-Blind Method Plasma Volume Sodium Chloride Dietary Completely randomized design Osmole Analysis of Variance business.industry Thermoregulation medicine.disease Bicycling Endocrinology chemistry Physical Endurance Hypervolemia business Body Temperature Regulation |
| Zdroj: | International journal of sports medicine. 26(3) |
| ISSN: | 0172-4622 |
| Popis: | The purpose of this study was to investigate the effects of an immediate pre-exercise, orally ingested, sodium load (164 mEq Na+) (IPOSL), equivalent to 10 ml per kilogram of body weight, on plasma volume, endurance performance, and thermoregulation. Fourteen male participants consumed a nearly isotonic (255 mOsm . kg (-1)) IPOSL and a hypotonic (94 mOsm . kg (-1)), no-sodium, placebo beverage (Pl) equivalent to 10 ml . kg (-1) body weight in a randomized design. Subjects cycled at 70 % of maximal work rate, in a 21.0 - 23.3 degrees C lab, for 45 min while cardiovascular and thermoregulatory variables were measured. This was followed by a 15-min performance time trial. IPOSL and Pl ingestion lead to a 3.1 % expansion and a 4.7 % reduction in resting baseline plasma volume, respectively. IPOSL maintained plasma volume during exercise to a greater extent than the Pl at 15 and 30, but not 45 min. There was a significant improvement ( approximately 7.8 %; p0.05) in time trial performance following IPOSL. No significant differences were observed for heart rate, core temperature, rate of perceived exertion or total body sweat rate (p0.05). In conclusion, IPOSL ingestion increased pre-exercise plasma volumes, maintained 15- and 30-min exercise plasma volumes, and improved an endurance performance time trial better than the Pl with no apparent compromise in thermoregulation. |
| Databáze: | OpenAIRE |
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