Effect of carbohydrate ingestion on ratings of perceived exertion during a marathon
| Autor: | Jie Kang, Edward C. Chaloupka, David C. Nieman, Robert J. Robertson, Cristiana R. Piccinni, Alan C. Utter, Richard R. Suminski |
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| Rok vydání: | 2002 |
| Předmět: |
Adult
Blood Glucose Male medicine.medical_specialty Physical Exertion Physical Therapy Sports Therapy and Rehabilitation Perceived exertion Growth hormone Sensitivity and Specificity Running Oxygen Consumption Double-Blind Method Heart Rate Reference Values Internal medicine Dietary Carbohydrates medicine Humans Ingestion Orthopedics and Sports Medicine Lactic Acid Exercise physiology Probability Analysis of Variance business.industry Body perception Carbohydrate Carbohydrate supplementation Endocrinology Physical Endurance Physical therapy Female Energy Metabolism business Blood Chemical Analysis |
| Zdroj: | Medicine & Science in Sports & Exercise. 34:1779-1784 |
| ISSN: | 0195-9131 |
| DOI: | 10.1097/00005768-200211000-00014 |
| Popis: | The purpose of this study was to investigate the effects of carbohydrate substrate availability on ratings of perceived exertion (RPE) and hormonal regulation during a competitive marathon.A randomized, double-blind study design was used in which subjects ran the marathon, and every 3.2 km, RPE and heart rate were measured. The marathoners were randomly assigned to receive carbohydrate (C) (N = 48) or placebo (P) (N = 50) beverages at a rate of 1 L x h(-1) during the race.Heart rate (%(HRMAX) ) was lower in P (82.0% +/- 0.6) than C (84.2% +/- 0.6) (P0.01), especially during the final 10 km: (78.7% +/- 1.0) and (84.5% +/- 0.7), respectively (P0.001). RPE was not significantly different between P and C throughout the marathon (P = 0.08) or during the final 10 km: (16.8 +/- 0.3) and (16.1 +/- 0.3), respectively (P = 0.06). Postrace plasma glucose (P0.001), insulin (P0.001), and lactate (P0.05) levels were significantly lower in P than C, and postrace cortisol (P0.05) significantly higher in P compared with C.Marathoners ingesting carbohydrate compared with placebo beverages were able to run at a higher intensity while reporting a nonsignificant difference in RPEs during a competitive race. |
| Databáze: | OpenAIRE |
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