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There are three physical activity objective monitors and a single combined wear log covering both monitors.

ActiGraph

The ActiGraph GT3X physical activity monitor measures acceleration in 3 axis, body position, and ambulation (steps). Participants wore the ActiGraph GT3X monitor two times during the study with six months between administrations. The monitor was placed on an elastic belt and participants were instructed to wear the belt on their waist with the monitor positioned over their right hip, directly under the right armpit. Participants were asked to wear the ActiGraph GT3X monitors all day, including naptimes, for seven days, and to remove the monitors when showering, bathing, and swimming and for bed at night. Participants were asked to wear the monitor for seven days, but some participants chose to wear the monitor for additional days beyond the specified week.

ActiGraph GT3X monitor data are provided in three formats: by 60-second, 10-second and 1 second epoch.

A small portion of the raw one second ActiGraph data is not included in the 10-second and 60-second summaries due to persistent invalid or out of range output, suggesting that the device had malfunctioned. The first 7 days of data (the protocol period) are always kept. Days outside the first week may be kept if the physical activity log indicates continued wear.

You may view data dictionaries and formats for the ActiGraph files. Datasets can be obtained by submitting a request.

Summary
  • Monitor recorded data
  • Worn twice for 7 days:
    • Groups 1&3 in Month 0 and Month 6
    • Groups 2&4 in Month 6 and Month 11
  • 955 Participants
    • 823 completed both administrations
    • 95 completed only the 1st
    • 37 completed only the 2nd
Available Data

ACTIGRAPH 10 & 60–SECOND EPOCH DATA

  • Date and time
  • Vector Magnitude (total acceleration per epoch, calculated as the sum over 10 seconds of the 1 second vector magnitude)
  • Inclinometer (orientation of monitor)
  • Accumulated steps per epoch
  • Vertical, horizontal and perpendicular axis acceleration data
  • Status: continuous walking/running, intermittent lying/sitting
  • Energy Expenditure value (EE) and METS calculated by the Crouter two-regression model on one axis (EE is not in 60-second data)
  • Wear log data – information provided by the participant about when they wore the device and reason for removing it. This data was entered by the participant and may differ from the monitor.

ACTIGRAPH 1-SECOND EPOCH DATA

  • Date and time (HH:MM:SS with hours 0-23)
  • Vector Magnitude (total acceleration per epoch, calculated as: vector magnitude = square root of (axis12 + axis22 + axis32))
  • Inclinometer (orientation of device)
  • Accumulated steps per epoch
  • Vertical, horizontal and perpendicular axis acceleration data

ActivPAL

The ActivPAL 3 physical activity monitor measures acceleration, body position, and ambulation (steps). Participants wore the ActivPAL 3 monitor two times during the study with six months between administrations. The monitor was placed on an adhesive patch and participants were instructed to attach the patch to the skin on the front of their right thigh, about a third of the way between the hip and knee. Participants were asked to wear the ActivPAL 3 monitors all day and night, including during sleep, for seven days, and to remove the monitors when showering, bathing, and swimming. Participants were asked to wear the monitor for seven days, but some participants chose to wear the monitor for additional days beyond the specified week. Instrument data has been processed by PALanalysis (v. 8.4.9.19).

Data are provided in two formats: by 15-second epoch and by activity event.

You may view data dictionaries and formats for the ActivPAL files. Datasets can be obtained by submitting a request.

Summary Available Data
  • Monitor recorded data
  • Worn twice for 7 days:
    • Groups 1&3 in Month 0 and Month 6
    • Groups 2&4 in Month 6 and Month 11
  • 931 participants with results
    • 744 completed both administrations
    • 108 completed only the 1st
    • 79 completed only the 2nd
  • Date and times
  • Activity score metabolic equivalent (MET)
  • Step count
  • Body position
  • Transitions in body position (not in event file)

Physical Activity Log

This dataset contains the raw information from the physical activity log, which lists information about when each participant wore the ActivPal and ActiGraph devices. There is one record for each day the participant filled out the wear log.

You may view data dictionaries and formats for the Physical Activity Log \ files. Datasets can be obtained by submitting a request.

Summary Available Data
  • Log of wearing monitors
  • 950 participants
  • Date of the form, and day of the week
  • Times for when the participant got out of bed, put on each device for the first time, intervals during the day when the device was not worn, the time the participant took off the device at the end of the day, and when they went to bed.

HRM

The Heart Rate Monitor is a monitor that measures heart rate and interbeat intervals. The monitor was worn by a participants in a subset of the IDATA study. Participants were asked to wear the device once for seven days and to fill out a wear log. The Heart Rate Monitor was supposed to be worn at all times, including swimming or showering

Heart Rate Monitor data are provided in three formats: by Long Source, Short Source, and Wear Log.

Click here for data dictionaries and formats for the Heart Rate Monitor files. Datasets can be obtained by submitting a request.

Summary Available Data
  • Monitor recorded data
  • Worn once for seven days:
    • Groups 1&3 in Month 0
    • Groups 2&4 in Month 5
  • Only a subset of the population was asked to participate with this instrument
    • 42 Participants from Long Source
    • 2 Participants from Short Source
    • 41 Participants with a Wear Log

HEART RATE MONITOR LONG SOURCE

  • Date and time
  • Activity
  • BPM
  • RHR
  • ECG
  • Lost Time
  • Interbeat Interval Minimums and Maximums

HEART RATE MONITOR SHORT SOURCE

  • Date and time
  • Activity
  • BPM
  • RHR
  • ECG
  • Calorie Factor
  • Interbeat Interval Times

HEART RATE MONITOR WEAR LOG

  • Date and time
  • Device On, Off, and Reason Date/Time