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Table 2 Laboratory-administered caffeine dosage (mg/kg) and baseline, task performance, and recovery systolic (SBP) and diastolic (DBP) blood pressure (mmHg) and heart rate (beats per minute; BPM) levels among men in each caffeine treatment group (estimated marginal means ± SEM)

From: Caffeine administration does not alter salivary α-amylase activity in young male daily caffeine consumers

  Caffeine treatment groups
  Placebo (N = 15) 200 mg (N = 15) 400 mg (N = 15)
Caffeine dosage (mg/kg) 0.00 ± 0.00 2.64 ± 0.091 5.51 ± 0.281
Systolic blood pressure (mmHg)    
Baseline 112.76 ± 2.06 116.76 ± 2.06 116.45 ± 2.06
Task performance 113.54 ± 2.44 116.26 ± 2.44 121.02 ± 2.44
Recovery 114.93 ± 2.202,3 120.35 ± 2.202,3 122.20 ± 2.202,3
Diastolic blood pressure (mmHg)    
Baseline 65.16 ± 1.67 65.33 ± 1.67 65.43 ± 1.67
Task performance 65.55 ± 1.91 67.98 ± 1.91 68.99 ± 1.91
Recovery 70.73 ± 1.742,4 70.73 ± 1.742,4 70.93 ± 1.742,4
Heart rate (BPM)    
Baseline 64.84 ± 2.29 65.49 ± 2.29 67.25 ± 2.29
Task performance 66.52 ± 2.24 65.19 ± 2.24 68.74 ± 2.24
Recovery 64.13 ± 2.002,5 61.73 ± 2.002,5 63.56 ± 2.002,5
  1. 1Caffeine treatment effect (200 mg < 400 mg), p < 0.0001.
  2. 2Time effect, p < 0.05.
  3. 3Baseline = Task Performance < Recovery, p < 0.05.
  4. 4Baseline < Task Performance < Recovery, p < 0.05.
  5. 5Baseline = Task Performance > Recovery, p < 0.05.