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Table 1 Distribution characteristics of heart rate variability indices

From: Normative references of heart rate variability and salivary alpha-amylase in a healthy young male population

 

Heart period

(ms)

lnHF

(ln-ms2)

lnLF

(ln-ms2)

ln(LF/HF)

(ln-ratio)

SDNN

(ms)

rMSSD

(ms)

n

417

417

417

417

417

417

mean

945.85

9.84

10.42

0.58

27.17

37.49

median

938.86

9.89

10.42

0.56

25.09

34.76

Standard deviationa

126.98

0.92

0.73

0.92

11.78

16.54

Coefficient of variation (%)

13.42

9.35

7.01

-b

43.36

44.12

Skewness

0.38

0.01

0.11

0.19

1.22

1.24

Kurtosis

0.26

0.32

-0.21

0.71

1.91

2.04

Fifth percentile

748.53

8.39

9.24

-0.90

12.4

16.98

95th percentile

1171.68

11.37

11.58

2.12

50.99

69.95

  1. HF: high frequency component; LF: low frequency component; rMSSD: root mean square of successive differences; SDNN: standard deviation of normal-to-normal intervals. Skewness is a measure of symmetry of distribution. Negative or positive skewness is indicated when the left or right tail of the histogram is longer, respectively. The skewness of a normally distributed data set is zero. Kurtosis is a measure of whether the distribution curve is peaked (positive) or flat (negative) relative to the normal distribution. The kurtosis of a normally distributed data set is zero. aStandard deviation of interindividual variation; bthe coefficient of variation of ln(LF/HF) was not calculated because it was occasionally negative.