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Table 3 Side-effects resulting from the ingestion of 1 and 3 mg/kg of caffeine using a caffeinated energy drink or the same drink without caffeine (0 mg/kg)

From: Dose response effects of a caffeine-containing energy drink on muscle performance: a repeated measures design

Item 0 mg/kg 1 mg/kg 3 mg/kg
Headache 8% 17% 8%
Abdominal/gut discomfort 0% 0% 17%
Muscle soreness 17% 17% 17%
Increased vigor/activeness 17% 8% 58%*
Tachycardia and heart palpitations 0% 0% 17%
Insomnia 17% 8% 25%
Increased urine production 8% 8% 25%
Increased anxiety 0% 8% 8%
  1. * Different from 0 mg/kg (P < 0.05).