Table 1 Differences in physiological parameters at different time points

From: Heterogeneous and lateralized cervical vascular responses to a 7-day head-down tilt bed rest

Parameter

Pre-HDT

HDT 0.5 d

HDT 1 d

HDT 3 d

HDT 7 d

R + 1 d

R + 3 d

R + 5 d

P value

HR, BPM

73.45 ± 9.80

65.03 ± 8.30

63.05 ± 8.64

62.50 (58.0, 66.75)

65.68 ± 9.01

74.80 ± 9.39

73.60 ± 11.69

78.03 ± 10.75

<0.001a*

SBP, mmHg

113.60 ± 10.50

118.40 ± 10.68

118.50 ± 9.51

118.70 ± 9.37

120.80 ± 8.31

115.50 (108.30, 124.0)

114.10 ± 12.25

118.40 ± 10.88

<0.001a*

DBP, mmHg

66.10 ± 7.88

67.90 ± 7.96

69.78 ± 7.45

71.40 ± 8.69

71.98 ± 7.24

70.38 ± 8.62

68.75 ± 8.34

70.48 ± 8.80

<0.001b*

MAP, mmHg

81.85 ± 7.82

84.70 ± 8.05

86.03 ± 7.41

87.13 ± 8.31

88.20 ± 6.66

85.95 ± 8.62

83.93 ± 8.75

86.43 ± 8.46

<0.001b*

PP, mmHg

47.53 ± 8.66

50.45 ± 8.67

48.70 ± 7.21

47.25 ± 7.06

48.78 ± 7.92

45.00 (40.00, 53.00)

45.35 ± 9.76

48.05 ± 9.67

0.146a

SpO2 (%)

98.00 (98.00, 98.00)

98.00 (97.00, 98.00)

98.00(97.25, 98.00)

98.00 (97.00, 98.00)

98.00 (97.00, 98.00)

98.00 (97.25, 98.00)

98.00 (97.00, 98.00)

98.00 (98.00, 98.00)

0.427a

  1. Normally distributed data are presented as the mean ± standard deviation, and non-normally distributed data are presented as the median (lower quartile, upper quartile).
  2. The bold one symbol indicates a significant difference compared with the Pre-HDT.
  3. 1 mmHg = 0.133 kPa.
  4. HR heart rate, BPM beat per minute, SBP systolic blood pressure, DBP diastolic blood pressure, MAP mean blood pressure, PP pulse pressure, SpO2 blood oxygen level, Pre-HDT pre-adaptation period prior to head-down tilt, HDT head-down tilt, R+ recovery time, d day.
  5. *Statistical significance P < 0.05.
  6. For comparisons of data: aFriedman test with Dunn’s test for post hoc analysis.
  7. bANOVA with Tukey’s honestly significant difference test for post hoc analysis.
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