Variable Details

Available Studies

MAP

Scaled? 

Not Scaled

Variable Type 

Longitudinal

Variable Name 

tactivity_d_avgnew

Categories

Actigraphy, Lifestyle

Average total daily activity
Actical activity measure - Average total daily activity (MAP only)

This variable is only available in MAP.

Average total daily activity is a measure of the sum of all activity during an average 24-hour period. Objective measures of physical activity are obtained using a portable actigraph: AX3 (2020-present), GENEActiv (2018-2020), Actical (2005-2018). See the Actigraphy category description for detailed information on each device. Participants are asked to wear the actigraph 24 hours per day for up to 10 days.

Total daily activity is the sum of all activity counts during a 24-hour period, averaged over the number of days that the individual wore the device.

Publications

James BD, Boyle PA, Bennett DA, Buchman AS. Total daily activity measured with actigraphy and motor function in community-dwelling older persons with and without dementia. Alzheimer disease and associated disorders. 2012 Jul-Sep; 26 (3):238-45. PubMed PMID: 21946015; PubMedCentral PMCID: PMC3251727 Buchman AS, Boyle PA, Yu L, Shah RC, Wilson RS, Bennett DA. Total daily physical activity and the risk of AD and cognitive decline in older adults. Neurology. 2012 Apr 18; 78 (17):1323-9. PubMed PMID: 22517108; PubMedCentral PMCID: PMC3335448