Research has shown conflicting results involving the efficacy of carbohydrateprotein
beverages on athletic performance. Purpose: To examine whether or not power
output during the latter stages in a series of repeated maximal or near maximal effort
anaerobic exercise bouts simulating a football game task was altered when consuming a
carbohydrate-protein (CP) beverage versus either a carbohydrate-only (C) beverage or a
placebo (P). Methods: Eighteen collegiate male football players participated in this
investigation. The subjects' mean age, height, weight, and percent body fat were 20yr,
180.4cm, 92.4kg, and 12%, respectively. The experimental exercise sessions were
completed by each athlete on three separate occasions, spaced one week apart. Subjects
were asked to perform a series of maximal-effort weighted sled-pushes, which simulated
a game-type activity over two halves of a football game separated by a 20-minute
simulated halftime recovery period. Maximal muscle power was assessed through the
use of a series of maximal jump-and-reach tests. The experimental beverages were
administered during the first 5 minutes of halftime. Water was permitted ad libitum
throughout each exercise session. The experimental beverages used included; 1) a
commercially available flavored aspartame-sweetened P beverage, Crystal Light, (300 ml,5 kcal), 2) a commercially available C beverage, Gatorade Energy Drinkî, (300 ml, 67.5
g CHO, 270 kcal), and 3) a commercially available CP beverage, Gatorade Nutrition
Shakeî, (243 ml diluted with water to 300 ml, 45 g CHO, 15 g Protein, 270 kcal). All
beverages were randomly assigned and each player received all three beverages. An
analysis of covariance (ANCOVA) was used to determine if differences existed in power
output between the experimental beverages. Results: The Least Square Mean (LSM) for
jump-power was significantly higher after C compared to CP (1587.36 watts vs. 1577.42
watts, respectively; p=0.0095). The LSM jump-power after the P beverage was also
lower than after the C beverage (1582.52), but was not statistically significant.
Conclusions: These data suggest that average power output over a series of high-intensity
anaerobic exercise bouts, which simulate football game tasks, is greatest after consuming
a C beverage during the halftime break compared with consuming a CP or P beverage.
| Identifer | oai:union.ndltd.org:tamu.edu/oai:repository.tamu.edu:1969.1/4756 |
| Date | 25 April 2007 |
| Creators | Crawford, Glenda Elane |
| Contributors | Crouse, Stephen F |
| Publisher | Texas A&M University |
| Source Sets | Texas A and M University |
| Language | en_US |
| Detected Language | English |
| Type | Book, Thesis, Electronic Thesis, text |
| Format | 557355 bytes, electronic, application/pdf, born digital |
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