Reliability of the Actigraph GT3X+ Accelerometer in Adults under Free-Living Conditions.
Reliability of the Actigraph GT3X+ accelerometer has not been determined under normal wear time criteria in a large sample of subjects and accelerometer units. The aim of this study was to assess contralateral hip difference and inter-instrument reliability of the Actigraph GT3X+ monitor in adults u...
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| Format: | Article |
| Language: | English |
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Public Library of Science (PLoS)
2015-01-01
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| Series: | PLoS ONE |
| Online Access: | http://europepmc.org/articles/PMC4537282?pdf=render |
| _version_ | 1818260815523872768 |
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| author | Eivind Aadland Einar Ylvisåker |
| author_facet | Eivind Aadland Einar Ylvisåker |
| author_sort | Eivind Aadland |
| collection | DOAJ |
| description | Reliability of the Actigraph GT3X+ accelerometer has not been determined under normal wear time criteria in a large sample of subjects and accelerometer units. The aim of this study was to assess contralateral hip difference and inter-instrument reliability of the Actigraph GT3X+ monitor in adults under long-term free-living conditions.Eighty-seven adult subjects (28 men; mean (standard deviation) age 31.3 (12.2) years; body mass index 23.7 (3.1) kg/m2) concurrently wore two GT3X+ accelerometers (174 units in total) attached to contralateral hips for 21 days. Reliability was assessed using Bland-Altman plots, mixed model regression analyses and absolute measures of agreement for different lengths of data accumulation (single-day-, 7-day- and 21-day periods).There were no significant differences between contralateral hips (effect size ≤0.042; p ≥.213). Inter-instrument reliability increased with increased length of data-accumulation. For a 7-day measurement period (n = 232 weeks), limits of agreement were ±68 cpm (vertical axis) and ±81.3 cpm (vector magnitude) for overall physical activity (PA) level, ±51 min for sedentary time, ±18.2 min for light PA, ±6.3 min for moderate PA, ±3.5 min for vigorous PA, and ±6.7 min for moderate-to-vigorous PA.The Actigraph GT3X+ accelerometer is a reliable tool for measuring PA in adults under free-living conditions using normal data-reduction criteria. Contralateral hip differences are very small. We suggest accelerometers be attached to the right hip and data to be accumulated over several days of measurement. |
| first_indexed | 2024-12-12T18:37:20Z |
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| id | doaj.art-f75aa61a9dfa4ebbbeefe0198e8a1ef1 |
| institution | Directory Open Access Journal |
| issn | 1932-6203 |
| language | English |
| last_indexed | 2024-12-12T18:37:20Z |
| publishDate | 2015-01-01 |
| publisher | Public Library of Science (PLoS) |
| record_format | Article |
| series | PLoS ONE |
| spelling | doaj.art-f75aa61a9dfa4ebbbeefe0198e8a1ef12022-12-22T00:15:45ZengPublic Library of Science (PLoS)PLoS ONE1932-62032015-01-01108e013460610.1371/journal.pone.0134606Reliability of the Actigraph GT3X+ Accelerometer in Adults under Free-Living Conditions.Eivind AadlandEinar YlvisåkerReliability of the Actigraph GT3X+ accelerometer has not been determined under normal wear time criteria in a large sample of subjects and accelerometer units. The aim of this study was to assess contralateral hip difference and inter-instrument reliability of the Actigraph GT3X+ monitor in adults under long-term free-living conditions.Eighty-seven adult subjects (28 men; mean (standard deviation) age 31.3 (12.2) years; body mass index 23.7 (3.1) kg/m2) concurrently wore two GT3X+ accelerometers (174 units in total) attached to contralateral hips for 21 days. Reliability was assessed using Bland-Altman plots, mixed model regression analyses and absolute measures of agreement for different lengths of data accumulation (single-day-, 7-day- and 21-day periods).There were no significant differences between contralateral hips (effect size ≤0.042; p ≥.213). Inter-instrument reliability increased with increased length of data-accumulation. For a 7-day measurement period (n = 232 weeks), limits of agreement were ±68 cpm (vertical axis) and ±81.3 cpm (vector magnitude) for overall physical activity (PA) level, ±51 min for sedentary time, ±18.2 min for light PA, ±6.3 min for moderate PA, ±3.5 min for vigorous PA, and ±6.7 min for moderate-to-vigorous PA.The Actigraph GT3X+ accelerometer is a reliable tool for measuring PA in adults under free-living conditions using normal data-reduction criteria. Contralateral hip differences are very small. We suggest accelerometers be attached to the right hip and data to be accumulated over several days of measurement.http://europepmc.org/articles/PMC4537282?pdf=render |
| spellingShingle | Eivind Aadland Einar Ylvisåker Reliability of the Actigraph GT3X+ Accelerometer in Adults under Free-Living Conditions. PLoS ONE |
| title | Reliability of the Actigraph GT3X+ Accelerometer in Adults under Free-Living Conditions. |
| title_full | Reliability of the Actigraph GT3X+ Accelerometer in Adults under Free-Living Conditions. |
| title_fullStr | Reliability of the Actigraph GT3X+ Accelerometer in Adults under Free-Living Conditions. |
| title_full_unstemmed | Reliability of the Actigraph GT3X+ Accelerometer in Adults under Free-Living Conditions. |
| title_short | Reliability of the Actigraph GT3X+ Accelerometer in Adults under Free-Living Conditions. |
| title_sort | reliability of the actigraph gt3x accelerometer in adults under free living conditions |
| url | http://europepmc.org/articles/PMC4537282?pdf=render |
| work_keys_str_mv | AT eivindaadland reliabilityoftheactigraphgt3xaccelerometerinadultsunderfreelivingconditions AT einarylvisaker reliabilityoftheactigraphgt3xaccelerometerinadultsunderfreelivingconditions |