Table 2.

Means and standard errors of postures and time periods (blocks).

	Block	Supine	Upright	p
SDNN	1	435.03 (87.88)	261.37 (46.27)	0.025*
	2	343.74 (50.25)	186.50 (32.94)	0.001***
	3	365.43 (64.78)	208.28 (45.28)	0.026*
	4	763.90 (123.41)	303.58 (63.65)	0.001***
RMSSD	1	38.18 (4.23)	35.15 (4.01)	0.513
	2	37.00 (3.73)	33.07 (2.92)	0.170
	3	39.00 (3.63)	33.43 (3.42)	0.068
	4	46.54 (4.12)	37.56 (4.53)	0.056
TP	1	1147.38 (154.49)	1592.29 (467.56)	0.292
	2	910.08 (119.40)	1133.99 (177.47)	0.042*
	3	942.51 (130.53)	1126.97 (173.03)	0.197
	4	2288.07 (337.55)	2297.69 (514.33)	0.986
LFnu	1	0.56 (0.04)	0.63 (0.02)	0.061
	2	0.59 (0.03)	0.67 (0.02)	0.005**
	3	0.58 (0.03)	0.69 (0.02)	0.001***
	4	0.59 (0.03)	0.69 (0.02)	0.001***
HFnu	1	0.40 (0.04)	0.32 (0.02)	0.052
	2	0.37 (0.03)	0.29 (0.02)	0.004**
	3	0.38 (0.03)	0.27 (0.02)	0.001***
	4	0.36 (0.03)	0.25 (0.02)	0.001***
LF/HF	1	2.51 (0.53)	2.61 (0.44)	0.835
	2	2.39 (0.47)	3.08 (0.41)	0.133
	3	2.27 (0.41)	3.17 (0.34)	0.029*
	4	2.26 (0.32)	3.43 (0.50)	0.013*

^*p < 0.05; **p < 0.01; ***p < 0.001.