M. Glaister at St Mary's University in Twickenham , UK and colleagues conducted a study and confirmed that caffeine supplementation can increase peak anaerobic power output.  The dose used in the trial was 5 mg caffeine per kg body weight.Glaister M, Muniz-Pumares D, Patterson SD, Foley P, McInnes G.  Caffeine supplementation and peak anaerobic power output.  Eur J Sport Sci. 2014 Oct 2:1-7.