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Table 2 24-hour ambulatory blood pressure monitoring and Holter analysis for heart rate variability with each visit.

From: Beneficial cardiovascular effects of reducing exposure to particulate air pollution with a simple facemask

   Without Mask With Mask
24 hour SBP, mmHg 106
(100 – 112)
106
(101 – 111)
  DBP, mmHg 69
(66 – 73)
70
(67 – 73)
  MAP, mmHg 82
(79 – 86)
82
(78 – 86)
  Heart rate, bpm 74
(70 – 77)
72
(68 – 76)
Night SBP, mmHg 100
(93 – 107)
101
(95 – 106)
  DBP, mmHg 63
(60 – 67)
64
(61 – 67)
  MAP, mmHg 76
(73 – 79)
75
(71 – 79)
  Heart rate, bpm 64
(61 – 67)
61
(58 – 65)
Day SBP, mmHg 110
(104 – 116)
109
(104 – 114)
  DBP, mmHg 73
(69 – 76)
73
(70 – 76)
  MAP, mmHg 85
(81 – 88)
85
(81 – 89)
  Heart rate, bpm 79
(74 – 84)
78
(73 – 82)
Heart rate variability Data validity, % 95.9 95.0
  Average NN interval, ms 829
(789 – 869)
850
(805 – 896)
  pNN50, % 15.9
(10.7 – 21.0)
17.9
(14.2 – 21.6)
  RMSSD, ms 35.1
(29.2 – 41.0)
37.1
(32.2 – 42.0)
  SDNN, ms 61.2
(54.9 – 67.5)
65.6*
(59.0 – 72.2)
  Triangular Index 12.9
(11.9 – 13.9)
13.8
(13.0 – 14.5)
  LF-power, ms2 816
(628 – 1004)
919*
(717 – 1122)
  HF-power, ms2 460
(325 – 595)
485
(400 – 569)
  LFn, ms 62.8
(56.7 – 68.9)
64.5
(60.6 – 68.4)
  HFn, ms 29.2
(25.5 – 32.8)
30.0
(27.0 – 33.1)
  HF/LF ratio 0.738
(0.507 – 0.970)
0.680
(0.519 – 0.842)
  1. All data expressed as mean (95% confidence interval). *P < 0.05 compared to control (no mask) day, Student's paired t-test.