Caffeinated chewing gum increases repeated sprint performance and augments increases in testosterone in competitive cyclists.
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http://www.ncbi.nlm.nih.gov/pubmed/20737165
Conclusion of this study
In contrast, cortisol concentrations were not elevated until after the third exercise set; following the caffeine treatment cortisol was reduced by 21 ± 31% (ES -0.30; ± 0.34) relative to placebo. The acute ingestion of caffeine via chewing gum attenuated fatigue during repeated, high-intensity sprint exercise in competitive cyclists. Furthermore, the delayed fatigue was associated with substantially elevated testosterone concentrations and decreased cortisol in the caffeine trials.
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