Translations equations to compare ActiGraph GT3X and Actical accelerometers activity counts
Background: This study aimed to develop a translation equation to enable comparison between Actical and ActiGraph GT3X accelerometer counts recorded minute by minute. Methods: Five males and five females of variable height, weight, body mass index and age participated in this investigation. Particip...
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| Format: | Journal Article |
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BioMed Central
2012
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| Online Access: | http://www.biomedcentral.com http://hdl.handle.net/20.500.11937/14496 |
| _version_ | 1848748638089510912 |
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| author | Straker, Leon Campbell, Amity |
| author_facet | Straker, Leon Campbell, Amity |
| author_sort | Straker, Leon |
| building | Curtin Institutional Repository |
| collection | Online Access |
| description | Background: This study aimed to develop a translation equation to enable comparison between Actical and ActiGraph GT3X accelerometer counts recorded minute by minute. Methods: Five males and five females of variable height, weight, body mass index and age participated in this investigation. Participants simultaneously wore an Actical and an ActiGraph accelerometer for two days. Conversion algorithms and R2 were calculated day by day for each subject between the omnidirectional Actical and three different ActiGraph (three-dimensional) outputs: 1) vertical direction, 2) combined vector, and 3) a custom vector. Three conversion algorithms suitable for minute/minute conversions were then calculated from the full data set. Results: The vertical ActiGraph activity counts demonstrated the closest relationship with the Actical, with consistent moderate to strong conversions using the algorithm: y = 0.905x, in the day by day data (R2 range: 0.514 to 0.989 and average: 0.822) and full data set (R2 = 0.865). Conclusions: The Actical is most sensitive to accelerations in the vertical direction, and does not closely correlate with three-dimensional ActiGraph output. Minute by minute conversions between the Actical and ActiGraphvertical component can be confidently performed between data sets and might allow further synthesis of information between studies. |
| first_indexed | 2025-11-14T07:08:13Z |
| format | Journal Article |
| id | curtin-20.500.11937-14496 |
| institution | Curtin University Malaysia |
| institution_category | Local University |
| last_indexed | 2025-11-14T07:08:13Z |
| publishDate | 2012 |
| publisher | BioMed Central |
| recordtype | eprints |
| repository_type | Digital Repository |
| spelling | curtin-20.500.11937-144962020-11-24T01:35:58Z Translations equations to compare ActiGraph GT3X and Actical accelerometers activity counts Straker, Leon Campbell, Amity Background: This study aimed to develop a translation equation to enable comparison between Actical and ActiGraph GT3X accelerometer counts recorded minute by minute. Methods: Five males and five females of variable height, weight, body mass index and age participated in this investigation. Participants simultaneously wore an Actical and an ActiGraph accelerometer for two days. Conversion algorithms and R2 were calculated day by day for each subject between the omnidirectional Actical and three different ActiGraph (three-dimensional) outputs: 1) vertical direction, 2) combined vector, and 3) a custom vector. Three conversion algorithms suitable for minute/minute conversions were then calculated from the full data set. Results: The vertical ActiGraph activity counts demonstrated the closest relationship with the Actical, with consistent moderate to strong conversions using the algorithm: y = 0.905x, in the day by day data (R2 range: 0.514 to 0.989 and average: 0.822) and full data set (R2 = 0.865). Conclusions: The Actical is most sensitive to accelerations in the vertical direction, and does not closely correlate with three-dimensional ActiGraph output. Minute by minute conversions between the Actical and ActiGraphvertical component can be confidently performed between data sets and might allow further synthesis of information between studies. 2012 Journal Article http://hdl.handle.net/20.500.11937/14496 10.1186/1471-2288-12-54 http://www.biomedcentral.com http://creativecommons.org/licenses/by/4.0/ BioMed Central fulltext |
| spellingShingle | Straker, Leon Campbell, Amity Translations equations to compare ActiGraph GT3X and Actical accelerometers activity counts |
| title | Translations equations to compare ActiGraph GT3X and Actical accelerometers activity counts |
| title_full | Translations equations to compare ActiGraph GT3X and Actical accelerometers activity counts |
| title_fullStr | Translations equations to compare ActiGraph GT3X and Actical accelerometers activity counts |
| title_full_unstemmed | Translations equations to compare ActiGraph GT3X and Actical accelerometers activity counts |
| title_short | Translations equations to compare ActiGraph GT3X and Actical accelerometers activity counts |
| title_sort | translations equations to compare actigraph gt3x and actical accelerometers activity counts |
| url | http://www.biomedcentral.com http://hdl.handle.net/20.500.11937/14496 |