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Table 1 Subjective variables from the VAS scale

From: Effects of acute caffeine, theanine and tyrosine supplementation on mental and physical performance in athletes

 ConditionΔ (T2-T1)Δ (T3-T1)Δ (T4-T1)p (group)p (time)p (interaction)
EnergyPL0.77 ± 0.21−1.56 ± 0.37−2.25 ± 0.490.33< 0.001*0.85
SUP0.49 ± 0.17− 1.64 ± 0.28− 2.72 ± 0.43
FocusPL0.61 ± 0.24− 0.93 ± 0.30−1.64 ± 0.430.31< 0.001*0.89
SUP0.49 ± 0.19−1.25 ± 0.39−2.12 ± 0.55
ConcentrationPL0.59 ± 0.25−0.82 ± 0.33− 1.54 ± 0.470.19< 0.001*0.69
SUP0.56 ± 0.18−1.33 ± 0.30− 2.14 ± 0.49
AlertnessPL0.58 ± 0.29− 0.80 ± 0.27− 1.33 ± 0.450.53< 0.001*0.76
SUP0.59 ± 0.26−0.87 ± 0.30− 1.80 ± 0.49
FatiguePL−0.10 ± 0.191.04 ± 0.441.24 ± 0.760.920.090.96
SUP0.06 ± 0.500.89 ± 0.551.10 ± 0.77
MotivationPL0.27 ± 0.23−1.15 ± 0.35−2.52 ± 0.520.71< 0.001*0.89
SUP0.49 ± 0.22−1.25 ± 0.39−2.28 ± 0.50
  1. Data displayed as mean ± SE
  2. PL placebo, SUP supplement containing caffeine, theanine and tyrosine
  3. *statistically significant time main effect