RECOVERY- Actigraph GT3X Physical Activity Monitors

The purpose of this acquisition is to provide accelerometer-based activity monitors for researchers participating in the Biomarker-Based Validation of Diet and Physical Activity Assessment Tools in Existing Cohorts.

Accelerometers are an accepted objective measure of physical activity, and are an essential element of the proposed research. The validation study requires detailed movement information to characterize the physical activity patterns of study participants for comparison with self-reported information and with activity energy expenditure calculated from doubly labeled water and resting metabolic rate measures. The current state of the physical activity field is that the best information would include triaxial acceleration information captured in high resolution (e.g., epoch length of 10 sec or less), step count data, and information about postural position.

The contractor shall provide:
1) 400 Actigraph GT3X with expanded memory physical activity monitors
2) 8 7-port USB hub with cables
3) 4 ActiLife Software for device initialization and data download

Salient characteristics of the Actigraph GT3X with expanded memory physical activity monitors include:
1.) Triaxial acceleration information captured in high resolution (which allows evaluation of orientation),
2.) Capability for < 10 second epoch length, and sufficient memory and battery for at least 7 days.
3.) Step count data
4.) Availability of information about postural position

1) The first delivery of 175 devices shall be delivered by March 26, 2010 to:
2) The second delivery of 175 devices shall be delivered by April 8, 2010 to:
3) The third delivery of 1,050 devices shall be delivered by July 30, 2010.

The Actigraph GT3X with expanded memory allows capture and storage of a week of triaxial acceleration data at one second resolution in addition to step count and postural orientation data. This is necessary to support the precise physical activity measurements required for the research to be supported. These capabilities are not found in other known physical activity monitors.
The Actigraph GT3X is the only known established monitor that meets the requirements noted above and Actigraph L.L.C. is the only known provider of the monitor and its related software.