Physiological responses to glycerol ingestion during exercise
| Autor: | D. E. Eddy, J. G. Seifert, G. A. Halaby, G. L. Paul, Robert Murray |
|---|---|
| Rok vydání: | 1991 |
| Předmět: |
Adult
Blood Glucose Glycerol Male medicine.medical_specialty Physiology Vasopressins Physical exercise Sweating Fatty Acids Nonesterified Plasma renin activity Thirst chemistry.chemical_compound Esophagus Physiology (medical) Internal medicine Heart rate Renin medicine Ingestion Humans Aldosterone Exercise Chemistry Body Weight Osmolar Concentration Hemodynamics Hormones Plasma osmolality Endocrinology Female medicine.symptom Antidiuretic Body Temperature Regulation |
| Zdroj: | Journal of applied physiology (Bethesda, Md. : 1985). 71(1) |
| ISSN: | 8750-7587 |
| Popis: | To study selected cardiovascular, thermoregulatory, and hormonal responses to the consumption of glycerol solutions during exercise, nine subjects cycled for 90 min at 50% peak O2 uptake in a 30 degree C, 45% relative humidity environment. Beverages tested included a 10% glycerol solution (G), a 6% carbohydrate-electrolyte beverage (CE), the 6% carbohydrate-electrolyte beverage plus 4% glycerol (CEG), and a water placebo (WP) ingested at regular intervals during the first 60 min of exercise. The beverages were administered in counterbalanced order with subjects serving as their own controls. Ingestion of the glycerol solutions resulted in an increase in plasma osmolality and attenuation of the decrease in plasma volume associated with the WP treatment (P less than 0.05). Plasma renin activity was highest with WP (P less than 0.05), and G was associated with increased antidiuretic hormone levels (P less than 0.05). Ratings of perceived thirst were lowest for CEG and G, and the frequency of gastrointestinal distress was greatest for G (P less than 0.05). However, no differences among beverage treatments were observed for heart rate, esophageal temperature, sweat rate, ratings of perceived exertion, or changes in cortisol and aldosterone levels. These data indicate that there are no substantial metabolic, hormonal, cardiovascular, or thermoregulatory advantages to the consumption of solutions containing 4 or 10% glycerol during exercise. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|