Table 1

Changes in vital signs following ingestion of caffeinated or decaffeinated espresso coffee1

Coffee

P-value²

Caffeinated

Decaffeinated

Time

Time × Treatment

N = 40

N = 40

Systolic blood pressure (mmHg)

basal

107 ± 2

107 ± 2

30 min

112 ± 2^a

106 ± 2

<0.05

<0.001

60 min

111 ± 2^a

107 ± 2

P-value³

<0.001

0.50

Diastolic blood pressure (mmHg)

basal

68 ± 1

67 ± 1

30 min

72 ± 1^a

66 ± 1

<0.001

<0.005

60 min

71 ± 1^b

68 ± 1

P-value³

<0.001

0.16

Heart rate (beats/min)

basal

67 ± 1

66 ± 1

30 min

69 ± 1^c

67 ± 1

<0.001

0.16

60 min

64 ± 1^d

65 ± 1^e

P-value³

<0.001

0.09

¹ All values are mean ± SEM. ² 3 × 2 ANOVA for repeated measures.

³ - P-value compares within group values between basal, 30 min, and 60 min for each variable within each group.

Paired t-test: ^a P < 0.001 vs. both decaffeinated coffee and basal value. ^b P < 0.001 vs. basal value and P < 0.05 vs. decaffeinated coffee. ^c P < 0.05 vs. basal value. ^d P < 0.005 vs. basal value and P < 0.001 vs 30 min value; ^e P < 0.05 vs 30 min value.

Buscemi et al. Nutrition Journal 2011 10:15   doi:10.1186/1475-2891-10-15