Table 2

Heart rate variability in angina patients and healthy subjects

HRV Subjects Patients p Value
GP (24 h) (ms2)1574 (1117)1042 (691)0.007
GP (08–20 h) (ms2)1355 (953)877 (535)0.03
GP (00–05 h) (ms2)2620 (2648)1765 (1754)0.04
HF (24 h) (ms2)149 (145)90 (82)0.02
HF (08–20 h) (ms2)103 (83)73 (61)0.04
HF (00–05 h) (ms2)356 (579)178 (225)0.03
LF (24 h) (ms2)705 (605)445 (355)0.02
LF (08–20 h) (ms2)645 (513)379 (273)0.01
LF (00–05) (ms2)1144 (1365)777 (982)NS
LF/HF (24 h)6.1 (4.4)6.2 (3.2)NS
RR (24 h) (ms)841 (127)815 (104)NS
RR (08–20 h) (ms)741 (225)723 (195)NS
RR (00–05 h) (ms)952 (310)938 (238)NS
SDANN (ms)136 (45)125 (34)NS
SDNN (ms)151 (46)136 (33)NS
SD (ms)56 (18)49 (13)0.02
rMSDD (ms)29 (11)23 (9)0.01
pNN50 (%)8.2 (6.9)4.8 (4.8)0.01
  • Values are mean (SD).

  • GP, global power (0.01–1.0 Hz); HF, power of the high frequency peak (0.15–0.40 Hz); LF, power of the low frequency peak (0.04–0.15 Hz); pNN50, proportion of adjacent normal RR intervals differing more than 50 ms from the preceding RR interval, stated as percentage; rMSSD, root mean square of differences of successive normal RR intervals; RR, mean RR interval; SD, mean of all five minute standard deviations of mean RR intervals; SDANN, standard deviation of all five minute mean normal RR intervals; SDNN, standard deviation of normal RR intervals.