Also, there was a significant decrease of SDNN
and RMSSD in response to painful stimuli (SDNN
: F = 6.
30%) increases in SDNN
, r-MSSD, LF, HF, and TP, respectively (all p < 0.
, SDANN, pNN50, and LFnu were similar in both groups, however RMSSD, pNN50, HFnu, LF/HF ratio, TS (p < 0.
(standard ms Standard deviation of all NN deviation of NN intervals, reflecting all the intervals) cyclic components responsible for variability.
In this investigation, baseline values of all time domain HRV parameters (RRNN, SDNN
, RMSSD) were significantly higher in the two supine positions compared with the seated position, suggesting that parasympathetic activity is related to postural effects.
The black men also exhibited significantly higher SDNN
and HFnu and significantly lower LF:HF ratio during the 25 to 30 minutes post-exercise HRV recording.
index : mean value of the standard deviations of the RR-interval times of normal beats in all 5-minute segments,
4 Hz), LF (%), HF (%), LF to HF ratio, SDNN
(milliseconds), pNN50 (%), and rMSSD (milliseconds) .
Heart rate variability parameters SDNN
24 hour 77 SDANN index, ms 61 SDNN
index, ms 58 rMSSD 24 pNN50, % 3 Spectral power-24 hour, 4633.
However, day/night differences in N-N intervals can contribute to a major fraction of the SDNN
magnitude (Kleiger et al 2005).
Standard deviation of all NN intervals (SDNN
index, square root of the mean of the sum of the squares of differences between adjacent NN intervals (RMSSD) and standard deviation of the averages of NN intervals in all 5-min segments of the entire recording (SDANN) from the time-domain criteria were calculated.
In addition to HR we evaluated the time-domain HRV parameters SDNN
and RMSSD (rootmean square of successive differences), and the frequency-domain HRV parameters LF power (0.