mean RR

Mean value of RR intervals, expressed in milliseconds

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SDNN

SDNN: Standard deviation of RR intervals, expressed in milliseconds

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RMSSD

RMSSD: Square root of the mean squared differences between successive RR intervals, expressed in milliseconds

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NN50

NN50: Number of successive RR interval pairs that differ more than 50 ms

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pNN50

pNN50: NN50 divided by the total number of RR intervals

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SDANN

SDANN: Standard deviation of the averages of RR intervals in 5-min segments, expressed in milliseconds

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SDNNI

SDNNI: Mean of the standard deviations of RR intervals in 5-min segments, expressed in milliseconds

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mean HR

Mean heart rate, expressed in beats per minute

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std HR

Standard deviation of heart rate

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min HR

Minimum HR computed using N=5 beat moving average

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max HR

Maximum HR computed using N=5 beat moving average

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SI (Stress Index)

SI: Baevsky stress index, computed according to the formula given in Baevsky 2009, is a geometric measure of HRV reflecting cardiovascular system stress

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HRV triangular index

HRV triangular index: integral of the histogram (i.e. total number of RR intervals) divided by the height of the histogram computed with a bin width of 1/128 seconds

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TINN

TINN: baseline width of the RR histogram evaluated through triangular interpolation

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AC

AC: Acceleration Capacity captures the shortening of RR interval within 2-4 successive beats. It is computed as a four point difference from the acceleration PRSA signal (phase-rectified signal averaging), expressed in milliseconds

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DC

DC: Deceleration Capacity is a measure of cardiac parasympathetic modulation as it captures the lengthening of RR interval within 2-4 successive beats. It is computed as a four point difference from the deceleration PRSA signal (phase-rectified signal averaging), expressed in milliseconds

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ACmod

ACmod: modified Acceleration Capacity, computed according to the formula given in Nasario-Junior et al. 2014, expressed in milliseconds

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DCmod

DCmod: modified Deceleration Capacity, computed according to the formula given in Nasario-Junior et al. 2014, expressed in milliseconds

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