Table 1 Classification of subjects into Class A or B based on “slow oscillation”.

From: Circadian challenge of astronauts’ unconscious mind adapting to microgravity in space, estimated by heart rate variability

 

Frequency range (Hz)

Pre

ISS01

ISS02

ISS03

ISS01 vs. Pre

ISS02 vs. Pre

ISS03 vs. Pre

Mean

SE

Mean

SE

Mean

SE

Mean

SE

t

p

t

p

t

p

Group A: B2-band response (+)

      

LF-band response (+)

      
 

Case 1

      

B2

0.10–0.20

149.8

7.07

138.7

4.70

160.8

4.86

191.6

7.33

    

4.10

0.0005

LF-b

0.01–0.05

1007.5

54.7

749.0

38.2

952.9

47.9

1235.2

57.1

    

2.88

0.0408

LF-c

0.05–0.15

459.4

18.8

449.4

14.6

543.9

16.8

664.5

20.5

  

3.35

0.0085

7.37

<0.0001

HF-c

0.15–0.50

135.9

6.9

102.1

3.4

109.1

3.0

138.3

3.8

      
 

Case 2

      

B2

0.10–0.20

216.7

8.75

346.3

9.00

273.2

8.41

341.9

10.33

10.32

<0.0001

4.65

<0.0001

9.25

<0.0001

LF-b

0.01–0.05

1119.3

52.1

1370.5

53.6

797.7

33.8

1035.5

41.1

3.36

0.0084

    

LF-c

0.05–0.15

641.9

22.2

1035.1

26.9

761.0

21.8

837.0

20.7

11.27

<0.0001

3.83

0.0014

6.43

<0.0001

HF-c

0.15–0.50

177.1

6.9

242.3

6.3

170.9

6.2

242.8

10.0

6.95

<0.0001

  

5.41

<0.0001

 

Case 3

      

B2

0.10–0.20

25.5

0.90

22.1

0.80

33.6

1.28

30.4

1.04

  

5.20

<0.0001

3.60

0.0036

LF-b

0.01–0.05

392.9

20.0

443.4

22.5

488.8

24.9

526.6

34.8

  

3.00

0.0277

3.34

0.0092

LF-c

0.05–0.15

120.0

3.8

106.9

3.3

161.4

5.0

146.4

6.3

  

6.59

<0.0001

3.60

0.0037

HF-c

0.15–0.50

42.8

1.0

24.0

0.6

34.1

1.0

35.2

1.1

      
 

Case 4

      

B2

0.10–0.20

121.0

5.12

147.2

5.77

150.0

5.43

172.7

6.28

3.39

0.0076

3.88

0.0011

6.37

<0.0001

LF-b

0.01–0.05

880.7

30.8

812.7

36.2

915.3

43.4

1143.9

66.9

    

3.57

0.0040

LF-c

0.05–0.15

571.0

23.7

538.6

21.0

543.6

19.1

595.8

21.2

      

HF-c

0.15–0.50

73.6

2.3

97.9

3.5

89.3

3.8

161.3

5.4

5.79

<0.0001

3.56

0.0041

15.03

<0.0001

Group B: B2-band response (−)

      

LF-band response (+)

      
 

Case 5

      

B2

0.10–0.20

169.6

5.98

93.9

3.03

84.5

2.50

96.8

3.59

      

LF-b

0.01–0.05

640.8

26.2

1077.1

69.9

1121.6

72.0

937.8

64.6

5.85

<0.0001

6.23

<0.0001

4.26

0.0003

LF-c

0.05–0.15

488.2

15.1

295.4

10.0

280.1

8.6

266.3

9.4

      

HF-c

0.15–0.50

120.5

3.1

94.3

3.2

77.5

2.1

214.4

10.4

    

8.64

<0.0001

 

Case 6

      

B2

0.10–0.20

132.1

4.74

103.3

3.61

107.6

2.88

113.0

3.29

      

LF-b

0.01–0.05

715.3

40.5

715.4

32.9

787.1

38.0

881.3

39.3

    

2.94

0.0335

LF-c

0.05–0.15

583.0

20.7

448.5

13.9

407.2

10.6

482.7

16.7

      

HF-c

0.15–0.50

59.9

2.0

60.7

1.7

79.6

1.9

75.4

1.8

  

7.11

<0.0001

5.64

<0.0001

LF-band response (−)

      
 

Case 7

      

B2

0.10–0.20

172.9

7.36

152.9

4.81

107.2

3.90

130.9

4.02

      

LF-b

0.01–0.05

2661.7

159.3

2251.2

143.9

1420.1

84.6

2305.5

133.4

      

LF-c

0.05–0.15

683.7

22.9

617.2

19.6

467.7

16.6

557.8

19.6

      

HF-c

0.15–0.50

174.2

5.0

165.0

3.4

107.9

2.6

128.3

2.8

      
 

Case 8

      

B2

0.10–0.20

355.5

12.29

254.9

8.61

327.6

10.06

325.2

11.96

      

LF-b

0.01–0.05

2907.3

188.9

2137.7

129.9

2165.7

131.8

2719.0

194.6

      

LF-c

0.05–0.15

1110.4

38.1

878.4

34.2

1025.4

34.7

997.1

38.2

      

HF-c

0.15–0.50

213.8

8.2

156.9

4.8

194.1

5.4

213.3

8.0

      
  1. B2-band (B2-b), HRV-SFO; LF-band: HRV-VSFO; LF-c: HRV LF-component; HF-c: HRV HF-component.
  2. N between 260 and 287; t: Student t; p: P-value (Sidak correction).