TABLE 2. Placebo and Caffeine Doses During Study Weeks

Study WeekMaintenance DaysProtocol Days
P indicates placebo; C, caffeine; C300–C, 300 mg/d maintenance; C600–C, 600 mg/d maintenance.
Week order was randomized across subjects.
P–P0 mg (3×0 mg)0 mg (3×0 mg)
P–C0 mg (3×0 mg)750 mg (3×250 mg)
C300–C300 mg (3×100 mg)750 mg (3 ×250 mg)
C600–C600 mg (3 ×200 mg)750 mg (3×250 mg)