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Effects of branched-chain amino acids and carbohydrate on fatigue during intermittent, high-intensity running
- Source :
- International journal of sports medicine. 20(5)
- Publication Year :
- 1999
-
Abstract
- Experimental support for the hypothesized benefits of BCAA supplements on endurance performance is limited. However, it is theorized that the benefits may be enhanced if 1) BCAA are taken along with a pre-event carbohydrate meal as well as during exercise, and 2) the exercise is intermittent in nature. This study tested the effects of ingesting carbohydrate beverages with and without BCAA before and during intermittent high-intensity running to fatigue. Eight subjects performed 3 exercise trials consisting of intermittent shuttle running (walking, sprinting, and running) to fatigue. Subjects drank either carbohydrate drinks given 1 h before (5 mL/kg, 18% carbohydrate) and during exercise (2 mL/kg, 6% carbohydrate) (CHO), carbohydrate drinks with BCAA (7 g) added to the portions consumed 1 h before and immediately before exercise (CHO+BCAA), or flavored water placebos (P). Subjects ran longer when fed either CHO or CHO+BCAA as compared to P, with no differences between CHO and CHO+BCAA. CHO and CHO+BCAA also had higher plasma glucose and insulin, and lower FFA (p < 0.05). These findings confirm a beneficial effect of carbohydrate feedings on fatigue during exercise designed to mimic the activity pattern that occurs in sports like soccer, basketball, and hockey. They do not, however, support the hypothesis of an added benefit of BCAA supplements.
- Subjects :
- Adult
Blood Glucose
Male
medicine.medical_specialty
medicine.medical_treatment
Physical Therapy, Sports Therapy and Rehabilitation
Physical exercise
Flavored water
Running
Internal medicine
medicine
Dietary Carbohydrates
Humans
Insulin
Orthopedics and Sports Medicine
Central nervous system fatigue
Fatigue
chemistry.chemical_classification
Meal
High intensity
Carbohydrate
Amino acid
Endocrinology
chemistry
Biochemistry
Dietary Supplements
Physical Endurance
Female
Amino Acids, Branched-Chain
Subjects
Details
- ISSN :
- 01724622
- Volume :
- 20
- Issue :
- 5
- Database :
- OpenAIRE
- Journal :
- International journal of sports medicine
- Accession number :
- edsair.doi.dedup.....fc0576a4b4ade6d5ceeec5b4de50f9ee