TY - JOUR
T1 - Effects of carbohydrate and caffeine ingestion on performance during a rugby union simulation protocol
AU - Roberts, Simon P
AU - Stokes, Keith A
AU - Trewartha, Grant
AU - Doyle, J
AU - Hogben, P
AU - Thompson, Dylan
PY - 2010/6
Y1 - 2010/6
N2 - In this study, we investigated the effect of ingesting carbohydrate alone or with caffeine on performance of a rugby union-specific shuttle running protocol. On three occasions, at least one week apart in a counterbalanced trial order, eight male rugby union forwards ingested either placebo or carbohydrate (1.2g center dot kg-1 body mass center dot h-1) before and during a rugby union-specific protocol, with pre-exercise caffeine ingestion (4mg center dot kg-1) before one of the carbohydrate trials (carbohydrate+caffeine). The intermittent exercise protocol included walking, jogging, and cruising at pre-determined intensities, simulated contact events, a sustained high-intensity test of speed and agility (Performance Test), and a 15-m sprint. Ratings of perceived exertion (RPE) were recorded every 5min and a motor skills test was performed after each 21-min block. Performance Test times were not significantly different between trials but the likelihood of 2% improvements for carbohydrate+caffeine over placebo and carbohydrate were 98% and 44%, respectively. For carbohydrate+caffeine, 15-m sprints were faster than for placebo (P=0.05) and the motor skills test was performed faster in the carbohydrate+caffeine trial than the carbohydrate and placebo trials (P0.05), while RPE was lower in the carbohydrate+caffeine trial than the carbohydrate and placebo trials (P0.05). The results indicate a likely benefit to rugby performance following co-ingestion of carbohydrate and caffeine.
AB - In this study, we investigated the effect of ingesting carbohydrate alone or with caffeine on performance of a rugby union-specific shuttle running protocol. On three occasions, at least one week apart in a counterbalanced trial order, eight male rugby union forwards ingested either placebo or carbohydrate (1.2g center dot kg-1 body mass center dot h-1) before and during a rugby union-specific protocol, with pre-exercise caffeine ingestion (4mg center dot kg-1) before one of the carbohydrate trials (carbohydrate+caffeine). The intermittent exercise protocol included walking, jogging, and cruising at pre-determined intensities, simulated contact events, a sustained high-intensity test of speed and agility (Performance Test), and a 15-m sprint. Ratings of perceived exertion (RPE) were recorded every 5min and a motor skills test was performed after each 21-min block. Performance Test times were not significantly different between trials but the likelihood of 2% improvements for carbohydrate+caffeine over placebo and carbohydrate were 98% and 44%, respectively. For carbohydrate+caffeine, 15-m sprints were faster than for placebo (P=0.05) and the motor skills test was performed faster in the carbohydrate+caffeine trial than the carbohydrate and placebo trials (P0.05), while RPE was lower in the carbohydrate+caffeine trial than the carbohydrate and placebo trials (P0.05). The results indicate a likely benefit to rugby performance following co-ingestion of carbohydrate and caffeine.
KW - ergogenic
KW - team sport
KW - sports nutrition
KW - supplements
UR - http://www.scopus.com/inward/record.url?scp=77953319725&partnerID=8YFLogxK
UR - http://dx.doi.org/10.1080/02640414.2010.484069
U2 - 10.1080/02640414.2010.484069
DO - 10.1080/02640414.2010.484069
M3 - Article
SN - 0264-0414
VL - 28
SP - 833
EP - 842
JO - Journal of Sports Sciences
JF - Journal of Sports Sciences
IS - 8
ER -