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. Author manuscript; available in PMC: 2011 Mar 29.
Published in final edited form as: Eur J Appl Physiol. 2010 Oct 2;111(3):497–507. doi: 10.1007/s00421-010-1670-9

Table 3.

Systolic blood pressure variability at baseline and during LBNP −20 mmHg. Median (confidence interval)

Baseline LBNP Δ (LBNP-Baseline)
Control
(n=56) 		CFS
(n=14) 		p-
value* 		Control
(n=56) 		CFS
(n=14) 		Control
(n=56) 		CFS
(n=14) 		p-
value*
Variance
(mmHg2)

37.2
(32.3–43.7)

41.7
(25.1–63.4)
0.509

35.0
(27.8–40.7)

38.0
(33.9–47.6)

−1.2
(−6.1–3.2)

1.5
(−12.3–10.3)
0.883
Total Power
(mmHg2)

48.4
(41.5–60.8)

51.1
(41.5–81.6)
0.472

40.2
(34.3–43.3)

43.0
(32.2–54.2)

−2.4
(−18.1–1.2)

−10.2
(−46.2–6.1)
0.481
HF absolute units
(mmHg2)

1.03
(0.89–1.25)

0.71
(0.33–1.22)
0.012

0.92
(0.77–1.19)

0.68
(0.43–0.93)

−0.14
(−0.27–−0.02)

0.02
(−0.40–0.32)
0.780
LF absolute units
(mmHg2)

5.76
(4.44–6.95)

2.96
(1.87–8.58)
0.223

6.00
(5.11–8.74)

6.66
(3.98–11.52)

−0.04
(−1.73–1.83)

2.97
(−0.56–4.48)
0.186
HF normalized
units (nu)

0.19
(0.15–0.25)

0.13
(0.07–0.49)
0.325

0.14
(0.10–0.21)

0.09
(0.08–0.14)

−0.03
(−0.07–0.03)

−0.03
(−0.09–0.02)
0.370
LF normalized
units (nu)

0.81
(0.75–0.85)

0.87
(0.51–0.93)
0.325

0.86
(0.79–0.90)

0.91
(0.86–0.92)

0.03
(−0.03–0.07)

0.03
(−0.02–0.09)
0.370
LF/HF 6.24
(4.37–8.23)		 8.23
(1.34–15.38)		 0.528 7.64
(4.61–10.33)		 12.21
(7.84–20.40)		 −0.03
(−1.42–3.24)		 2.52
(−1.53–8.68)		 0.386
*

Wilcoxon-Mann-Whitney’s test. In order to reduce the methodological problem of multiple comparisons, statistical tests were only performed for the cardiovascular variable baseline and Δ (LBNP-Baseline)