QT and heart rate corrected QT (QTc) intervals before (white bars) and 60 min after (dark bars) ingestion of one cup of caffeinated (CC) or decaffeinated (DC) espresso coffee. Data are expressed as mean ± SEM and analyzed by using paired t-test. * P < 0.05 for the comparison versus baseline.
Buscemi et al. Nutrition Journal 2011 10:15 doi:10.1186/1475-2891-10-15