sedbreaks: Sedentary Breaks

In accelerometry: Functions for Processing Accelerometer Data

Description

Identifies sedentary breaks in accelerometer count data.

Usage

sedbreaks(counts, weartime = NULL, thresh = 100, flags = FALSE)

Arguments

counts	Integer vector with accelerometer count values.
weartime	Integer vector with 1's for wear time minutes and 0's for non-wear time minutes.
thresh	Integer value specifying minimum count value to consider a break from sedentary time.
flags	Logical value for whether to return a vector of 1's and 0's flagging the sedentary breaks (as opposed to the total number of sedentary breaks).

Value

Integer value or vector depending on flags.

Examples

# Load accelerometer data for first 5 participants in NHANES 2003-2004
data(unidata)

# Get data from ID number 21005
id.part1 <- unidata[unidata[, "seqn"] == 21005, "seqn"]
counts.part1 <- unidata[unidata[, "seqn"] == 21005, "paxinten"]

# Identify periods of valid wear time
wear.part1 <- weartime(counts = counts.part1)

# Count number of sedentary breaks (over full week)
n.sedbreaks <- sedbreaks(counts = counts.part1, weartime = wear.part1)

# Flag sedentary breaks
sedbreaks.flagged <- sedbreaks(counts = counts.part1, weartime = wear.part1, 
                               flags = TRUE)

accelerometry documentation built on May 2, 2019, 1:07 p.m.