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Table 2 Subject characteristics

From: Effects of two pre-workout supplements on concentric and eccentric force production during lower body resistance exercise in males and females: a counterbalanced, double-blind, placebo-controlled trial

  Females (n = 12) Males (n = 9) Combined (n = 21)
Age (y) 21.5 ± 2.0 20.7 ± 2.8 21.1 ± 2.4
Height (cm) 163.1 ± 6.4 175.0 ± 7.9 168.1 ± 9.1
Weight (kg) 63.2 ± 6.8 74.7 ± 14.0 68.2 ± 11.8
Body fat (%) 24.3 ± 7.2 10.2 ± 3.8 18.3 ± 9.2
RT experience (y) 3.6 ± 2.3 3.9 ± 3.0 3.7 ± 2.6
Weekly RT (h) 7.4 ± 3.7 7.7 ± 4.2 7.5 ± 3.9
Daily caffeine intakea (mg) 271 ± 123 223 ± 106 250 ± 116
  1. Mean ± SD
  2. a67% of participants reported that pre-workout supplements were one of their regular sources of caffeine