activpalProcessing (version 1.0.1)

lit.min.AP: Estimate Time in Light Intensity Activity

Description

This function estimates time spent in light intensity activity. Light intensity activity is activity between 1.5-2.99 METs.

Usage

lit.min.AP(mets, epoch = 1)

Arguments

mets

mets is a vector of met values

epoch

numeric value indicating what epoch (in seconds) the data are in (e.g. 60 = 1 minute epochs). The default value is 1 second

Value

a numeric value indicating hours spent in light intensity activity

Details

The default settings of the AP assign a met value of 1.25 to sitting, 1.4 to standing and estimates a met value for stepping activities. Cadence is used to estimate mets for stepping. With these settings all standing activity will be considered sedentary (e.g. < 1.5 mets). In the second-by-second function in this package standing met values are changed to 1.5 so that standing is considered a light intensity activity

See Also

sed.min.AP mvpa.min.AP

Examples

	
data(second.by.second)
mets <- second.by.second.data$mets	

lit.min.AP(mets,epoch=1)

# summarize by date
tapply(second.by.second.data$mets, second.by.second.data$date, lit.min.AP,epoch=1)