activpalProcessing (version 1.0.2)

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

Description

This function estimates time spent in light intensity activity. Light intensity activity is activity in the standing or stepping posture and between 1.5-2.99 METs.

Usage

lit.min.AP(mets, posture, epoch = 1)

Arguments

mets

mets is a vector of met values

posture

posture is a vector of values 0-2 indicating 0=sitting, 1=standing, 2=stepping

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. Although the default met value for standing is 1.4, which is below the traditional met threshold for light intensity, standing is always considered light because it is an upright posture and only seated activities are considered sedentary

See Also

sed.min.AP mvpa.min.AP

Examples

	
data(second.by.second.data)
mets <- second.by.second.data$mets	
posture <- second.by.second.data$ap.posture
lit.min.AP(mets,posture,epoch=1)