Table IV.

Autonomic Function at Baseline and 12 Months

Parameter (Mean± SEM)	Normal	Baseline	12 Months	p Value
Time domain variables (ms)
Average RR interval	667–1000	711.3±16.3	723.3±19.1	0.18
SD of the average RR interval over a 24‐h period	141±39	81.1±5.9	79.3±4.9	0.90
SD of all 5‐min mean RR intervals	127±35	75.6±5.9	72.9±4.4	0.79
Average SD of all 5‐min RR intervals		27.1±2.5	26.9±2.3	0.80
% of RR intervals with >50 ms variation		0.64±0.26	1.11±0.80	0.53
$$ of mean squared differences of successive RR intervals	27±12	9.9±1.3	11.2±1.6	0.41
Covariance of the RR intervals		11.4±0.8	10.9±0.6	0.61
Frequency domain variables (Hz)
High frequency (HF)	975±203	59.6±25.7	36.1±7.3	0.37
Low frequency (LF)	1170±416	180.3±60	119.3±29	0.14
LF/HF ratio	1.5–2.0	3.77±0.43	3.37±0.44	0.25
Very LF		715.0±166.4	411.2±72.3	0.03
Ultra LF		7186±1624	5654±830	0.30