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ERIC Number: EJ880324
Record Type: Journal
Publication Date: 2010
Pages: 13
Abstractor: As Provided
Reference Count: 44
ISSN: ISSN-1091-367X
Technical Reliability Assessment of the Actigraph GT1M Accelerometer
Silva, Pedro; Mota, Jorge; Esliger, Dale; Welk, Gregory
Measurement in Physical Education and Exercise Science, v14 n2 p79-91 2010
The purpose of this study was to determine the reliability of the Actigraph GT1M (Pensacola, FL, USA) accelerometer activity count and step functions. Fifty GT1M accelerometers were initialized to collect simultaneous acceleration counts and steps data using 15-sec epochs. All reliability testing was completed using a mechanical shaker plate to perform six different test conditions in Experiment 1 and 18 test conditions in Experiment 2. The overall intra- and inter-instrument reliability of the GT1M was CV[subscript intra] = 2.9% and CV[subscript inter] = 3.5% for counts and CV[subscript intra] = 1.1% and CV[subscript inter] = 1.2% for steps. No batch effects were evident in the 50 GT1Ms. The Actigraph GT1M accelerometer demonstrated good reliability for measuring both counts and steps. However, the ability of the GT1M to consistently detect acceleration at a given acceleration and frequency condition varied widely. Future studies clarifying the filtering limitations and the threshold necessary to detect the occurrence of movement are warranted. (Contains 4 tables and 3 figures.)
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Publication Type: Journal Articles; Reports - Research
Education Level: N/A
Audience: N/A
Language: English
Sponsor: N/A
Authoring Institution: N/A