Caffeine Gum and Cycling Performance: A Timing Study.

1Department of Exercise Physiology, 163 Gym Annex, Kent State University, Kent, OH 44242 USA, Tel: (330) 672-2857
The Journal of Strength and Conditioning Research (Impact Factor: 1.8). 04/2012; DOI: 10.1519/JSC.0b013e3182541d03
Source: PubMed

ABSTRACT The purpose of the present study was to determine the most efficacious time to administer caffeine (CAF) in chewing gum to enhance cycling performance. Eight male cyclists participated in 5 separate laboratory sessions. During the first visit, subjects underwent a graded exercise test to determine maximal oxygen consumption (VO2max). During the next 4 visits, three pieces of chewing gum were administered at three time points (120 min pre-cycling, 60 min pre-cycling, and 5 min pre-cycling). In three of the four visits, at one of the time points mentioned previously, 300 mg of CAF was administered. During the fourth visit, placebo gum was administered at all 3 time points. The experimental trials were defined as follows: Trial A (-120), Trial B (-60), Trial C (-5), and Trial D (Placebo). Following baseline measurements, time allotted for gum administration, and a standard warm-up, participants cycled at 75% VO2max for 15 min then completed a 7 kj·kg cycling time trial. Data were analyzed using a repeated measures analysis of variance. Cycling performance was improved in Trial C (-5), but not in Trial A (-120) or Trial B (-60), relative to Trial D (Placebo). Caffeine administered in chewing gum enhanced cycling performance when administered immediately prior, but not when administered 1 or 2 hr prior to cycling.

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