Table 4.

Mean 24-hour data

	Controls	Low paraplegia	High paraplegia	Tetraplegia	Significance
24-hour HR (bpm)	70 ± 9	83 ± 12	80 ± 6	69 ± 10	1,2,5,6
Daytime HR	75 ± 10	87 ± 13	87 ± 9	70 ± 10	1,2,5,6
Nighttime HR	62 ± 10	75 ± 13	70 ± 6	64 ± 9	1,5
Nocturnal HRdip	−17 ± 8	−14 ± 8	−19 ± 7	−8 ± 7	3,6
SDANN (ms)	112 ± 31	96 ± 34	140 ± 45	103 ± 31	4,6
rMSSD (ms)	61 ± 20	30 ± 13	46 ± 10	51 ± 20	1,4,5
24-hour SBP (mmHg)	115 ± 8	113 ± 13	116 ± 8	107 ± 11	NS
Daytime SBP	119 ± 8	114 ± 16	115 ± 7	103 ± 12	3,5,6
Nighttime SBP	107 ± 8	102 ± 11	108 ± 11	106 ± 10	NS
Nocturnal SBPdip	−10 ± 5	−10 ± 11	−6 ± 10	3 ± 10	3,5,6

Data are means ± SD; HR, heart rate; SBP, systolic blood pressure; DBP, diastolic blood pressure; MAP, mean arterial pressure; SDANN, standard deviation of the average normal R–R interval; RMSSD, root mean square of the standard deviation; AI, autonomic index.

1, control versus low paraplegia; 2, control versus high paraplegia; 3, control versus tetraplegia; 4, low paraplegia versus high paraplegia; 5, low paraplegia versus tetraplegia; 6, high paraplegia versus tetraplegia.