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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.