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[RC] CHO - Ridecamp Guest

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Authors JJ Winnick, JM Davis, RS Welsh, MD Carmichael, EA Murphy, JA Blackmon
Title   Carbohydrate feedings during team sport exercise preserve physical and 
CNS function
Full source     Medicine and Science in Sports and Exercise, 2005, Vol 37, Iss 
2, pp 306-315

WINNICK, J. J., J. M. DAVIS, R. S. WELSH, M. D. CARMICHAEL, E. A. MURPHY, and 
J. A. BLACKMON. Carbohydrate Feedings during Team Sport Exercise Preserve 
Physical and CNS Function. Med. Sci. Sports Exerc., Vol. 37, No. 2, pp. 
306-315, 2005. Purpose: This study was designed to examine the effect of 
carbohydrate (CHO) feedings on physical and central nervous system (CNS) 
function during intermittent high-intensity exercise with physical demands 
similar to those of team sports such as basketball. Methods: Twenty active men 
(N = 10) and women (N = 10), with experience competing in team sports, 
performed three practice sessions before two experimental trials during which 
they were fed either a 6% CHO solution or a flavored placebo (PBO). 
Experimental trials consisted of four 15-min quarters of shuttle running with 
variable intensities ranging from walking (30% VO2max) to running (120% VO2max) 
to maximal sprinting, and 40 jumps at a target hanging at 80% of their maximum 
vertical jump height. Subjects received 5 mL(.)kg(-1) of fluid before exercise 
and 3 mL(.)kg(-1) after exercise, in addition to 3 mL(.)kg(-1) over a 5-min 
span after the first and third quarters, and 8 mL(.)kg(-1) during a 20-min 
halftime. During each break, the subjects performed a battery of tests 
measuring peripheral and CNS function, including 20-m sprints, a 60-s maximal 
jumping test, internal and external mood evaluation, cognitive function, force 
sensation, tests of motor skills, and target-jumping accuracy. Results: 
Compared with PBO, CHO feedings during exercise resulted in faster 20-m sprint 
times and higher average jump height in the fourth quarter (P < 0.05). CHO 
feedings also reduced force sensation, enhanced motor skills, and improved mood 
late in exercise versus PBO (P < 0.05). Conclusion: These results suggest that 
CHO feedings during intermittent high-intensity exercise similar to that of 
team sports benefited both peripheral and CNS function late in exercise 
compared with a flavored placebo.


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