TY - JOUR
T1 - Low-dose caffeine administered in chewing gum does not enhance cycling to exhaustion
AU - Ryan, Edward J.
AU - Kim, Chul Ho
AU - Muller, Matthew D.
AU - Bellar, David M.
AU - Barkley, Jacob E.
AU - Bliss, Matthew V.
AU - Jankowski-Wilkinson, Andrea
AU - Russell, Morgan
AU - Otterstetter, Ronald
AU - MacAnder, Daniela
AU - Glickman, Ellen L.
AU - Kamimori, Gary H.
PY - 2012/3
Y1 - 2012/3
N2 - Low-dose caffeine administered in chewing gum does not enhance cycling to exhaustion. The purpose of the current investigation was to examine the effect of low-dose caffeine (CAF) administered in chewing gum at 3 different time points during submaximal cycling exercise to exhaustion. Eight college-aged (26 ± 4 years), physically active (45.5 ± 5.7 ml·kg -1middot;min -1) volunteers participated in 4 experimental trials. Two pieces of caffeinated chewing gum (100 mg per piece, total quantity of 200 mg) were administered in a double-blind manner at 1 of 3 time points (-35, -5, and +15 minutes) with placebo at the other 2 points and at all 3 points in the control trial. The participants cycled at 85% of maximal oxygen consumption until volitional fatigue and time to exhaustion (TTE) were recorded in minutes. Venous blood samples were obtained at240,210, and immediately postexercise and analyzed for serum-free fatty acid and plasma catecholamine concentrations. Oxygen consumption, respiratory exchange ratio, heart rate, glucose, lactate, ratings of perceived exertion, and perceived leg pain measures were obtained at baseline and every 10 minutes during cycling. The results showed that there were no significant differences between the trials for any of the parametersmeasured including TTE. These findings suggest that low-dose CAF administered in chewing gum has no effect on TTE during cycling in recreational athletes and is, therefore, not recommended.
AB - Low-dose caffeine administered in chewing gum does not enhance cycling to exhaustion. The purpose of the current investigation was to examine the effect of low-dose caffeine (CAF) administered in chewing gum at 3 different time points during submaximal cycling exercise to exhaustion. Eight college-aged (26 ± 4 years), physically active (45.5 ± 5.7 ml·kg -1middot;min -1) volunteers participated in 4 experimental trials. Two pieces of caffeinated chewing gum (100 mg per piece, total quantity of 200 mg) were administered in a double-blind manner at 1 of 3 time points (-35, -5, and +15 minutes) with placebo at the other 2 points and at all 3 points in the control trial. The participants cycled at 85% of maximal oxygen consumption until volitional fatigue and time to exhaustion (TTE) were recorded in minutes. Venous blood samples were obtained at240,210, and immediately postexercise and analyzed for serum-free fatty acid and plasma catecholamine concentrations. Oxygen consumption, respiratory exchange ratio, heart rate, glucose, lactate, ratings of perceived exertion, and perceived leg pain measures were obtained at baseline and every 10 minutes during cycling. The results showed that there were no significant differences between the trials for any of the parametersmeasured including TTE. These findings suggest that low-dose CAF administered in chewing gum has no effect on TTE during cycling in recreational athletes and is, therefore, not recommended.
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U2 - 10.1519/JSC.0b013e31822a5cd4
DO - 10.1519/JSC.0b013e31822a5cd4
M3 - Article
C2 - 22293680
AN - SCOPUS:84859798643
SN - 1064-8011
VL - 26
SP - 844
EP - 850
JO - Journal of strength and conditioning research
JF - Journal of strength and conditioning research
IS - 3
ER -