Segmented (long-term) HRV indices: SDANN and SDNN index

Splits an NN-interval series into consecutive fixed-duration segments (5 minutes by default) and returns the two Task Force (1996) long-term variability measures.

Usage

ecgHRVsegmented(rr, segment_sec = 300)

Arguments

rr

Numeric vector of NN/RR intervals in milliseconds.

segment_sec

Segment length in seconds (default 300 = 5 minutes).

Value

A list with:

SDANN

Standard deviation of the per-segment mean NN intervals (ms) - long-term variability.

SDNN_index

Mean of the per-segment SDNN values (ms) - average short-term variability.

n_segments

Number of segments used.

References

Task Force of the ESC and NASPE (1996). Circulation, 93(5), 1043-1065.

See also

ecgHRVgeometric, ecgHRVtime

Examples

set.seed(1)
rr <- 800 + rnorm(3000, sd = 40)
ecgHRVsegmented(rr, segment_sec = 300)
#> $SDANN
#> [1] 1.7121
#> 
#> $SDNN_index
#> [1] 41.39023
#> 
#> $n_segments
#> [1] 8
#>