Table 2.

NIRS response differences between postural changes

	Sit to stand versus slow supine to stand	p value	Sit to stand versus rapid supine to stand	p value	Slow supine to stand versus rapid supine to stand	p value
0–30 s interval
O2Hb, ∆µmol/L, mean (SD)
Mean	− 2.89 (3.60)	0.0077	− 3.44 (3.64)	0.0026	− 0.56 (2.58)	0.4169
Maximum	− 1.45 (2.44)	0.0368	− 1.27 (1.86)	0.0189	0.18 (1.54)	0.6551
Minimum	− 3.78 (3.82)	0.0018	− 4.09 (3.58)	0.0006*	− 0.31 (3.04)	0.6959
HHb, ∆µmol/L, mean (SD)
Mean	− 0.67 (1.06)	0.0279	− 0.89 (1.26)	0.0158	− 0.22 (0.99)	0.4047
Maximum	− 0.27 (1.00)	0.3231	− 0.50 (0.97)	0.0642	− 0.24 (0.50)	0.0848
Minimum	− 0.71 (0.98)	0.0143	− 0.91 (1.24)	0.0131	− 0.20 (1.05)	0.4689
TSI, ∆%, mean (SD)
Mean	0.0 (1.1)	0.9580	0.2 (1.5)	0.6058	0.2 (1.4)	0.5495
Maximum	0.3 (1.2)	0.3031	0.9 (2.4)	0.1792	0.6 (2.4)	0.3941
Minimum	− 0.3 (1.0)	0.3169	− 0.7 (1.1)	0.0309	− 0.4 (0.8)	0.0625
30–180 s interval
O2Hb, ∆µmol/L, mean (SD)
Mean	− 4.79 (3.78)	0.0002*	− 4.45 (3.84)	0.0005*	0.34 (3.95)	0.7451
Maximum	− 4.31 (3.71)	0.0005*	− 2.57 (8.74)	0.2739	1.74 (8.59)	0.4448
Minimum	− 4.50 (4.01)	0.0007*	− 5.31 (4.44)	0.0004*	− 0.81 (3.46)	0.3792
HHb, ∆µmol/L, mean (SD)
Mean	1.01 (1.10)	0.0031	1.58 (3.06)	0.0663	0.57 (2.51)	0.3941
Maximum	1.11 (1.11)	0.0017	3.01 (8.13)	0.1731	1.90 (7.67)	0.3537
Minimum	0.42 (1.41)	0.2653	0.00 (1.65)	0.9956	− 0.42 (1.25)	0.2145
TSI, ∆%, mean (SD)
Mean	− 0.1 (2.1)	0.8743	− 0.1 (1.9)	0.7806	− 0.1 (1.0)	0.8259
Maximum	0.1 (1.9)	0.8672	0.8 (3.6)	0.4273	0.7 (3.5)	0.4644
Minimum	− 0.0 (2.1)	0.9637	− 0.5 (2.4)	0.4707	− 0.4 (1.3)	0.2260

Bold values indicate significant differences before correction for multiple comparisons

NIRS responses (i.e., mean, highest value and lowest value) in two intervals, compared between postural changes. Significantly different responses were observed when comparing sit to stand with supine to stand. The responses do not differ significantly between slow and rapid supine to stand

*This association remains significant after correction for multiple comparisons