Variability and Reliability of the Axivity AX6 Accelerometer in Technical and Human Motion Conditions
This study aimed to evaluate the intra- and inter-instrument variability and reliability of the Axivity AX6 accelerometer under controlled technical conditions and human motion scenarios. In the first experiment, 12 accelerometers were affixed to a vibration platform and tested at four frequencies (...
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MDPI AG
2025-04-01
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| author | Marcos Echevarría-Polo Pedro J. Marín Esther Pueyo Javier Ramos Maqueda Nuria Garatachea |
| author_facet | Marcos Echevarría-Polo Pedro J. Marín Esther Pueyo Javier Ramos Maqueda Nuria Garatachea |
| author_sort | Marcos Echevarría-Polo |
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| description | This study aimed to evaluate the intra- and inter-instrument variability and reliability of the Axivity AX6 accelerometer under controlled technical conditions and human motion scenarios. In the first experiment, 12 accelerometers were affixed to a vibration platform and tested at four frequencies (2.2, 3.2, 6.5, and 9.4 Hz) along three axes to assess frequency- and axis-dependent variability. In the second experiment, four AX6 accelerometers were simultaneously placed on a subject’s wrist and tested under four human motion conditions (walking at 4 km·h<sup>−1</sup> and 6 km·h<sup>−1</sup> and running at 8 km·h<sup>−1</sup> and 10 km·h<sup>−1</sup>). Results demonstrated low intra- and inter-instrument variability (CVintra: 3.3–4.5%; CVinter: 6.3–7.7%) with high reliability (ICC = 0.98). Similar results were observed in human motion conditions (CVintra: 5.3–8.8%; CVinter: 7.1–10.4%), with ICC values of 0.98 for combined devices, and 0.99 for each device individually. Despite statistically significant differences (<i>p</i> < 0.05) between devices in human motion all conditions, the variations remained below the minimal clinically significant difference threshold. These findings indicate that under technical conditions on a vibrating platform, and within the range of typical human accelerations, the Axivity AX6 is a reliable tool for measuring accelerations representative of physical activity. However, further research is necessary to validate its performance under free-living conditions. |
| format | Article |
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| language | English |
| publishDate | 2025-04-01 |
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| spelling | doaj-art-54649e4670fa4f6791ddbca3ca9b65e42025-08-20T02:25:11ZengMDPI AGSensors1424-82202025-04-01258248010.3390/s25082480Variability and Reliability of the Axivity AX6 Accelerometer in Technical and Human Motion ConditionsMarcos Echevarría-Polo0Pedro J. Marín1Esther Pueyo2Javier Ramos Maqueda3Nuria Garatachea4EXER-GENUD “Growth, Exercise, NUtrition and Development” Research Group, University of Zaragoza, 50009 Zaragoza, SpainCYMO Research Institute, 47140 Valladolid, SpainBSICos Group, I3A, IIS Aragón, University of Zaragoza, 50018 Zaragoza, SpainBSICos Group, I3A, IIS Aragón, University of Zaragoza, 50018 Zaragoza, SpainEXER-GENUD “Growth, Exercise, NUtrition and Development” Research Group, University of Zaragoza, 50009 Zaragoza, SpainThis study aimed to evaluate the intra- and inter-instrument variability and reliability of the Axivity AX6 accelerometer under controlled technical conditions and human motion scenarios. In the first experiment, 12 accelerometers were affixed to a vibration platform and tested at four frequencies (2.2, 3.2, 6.5, and 9.4 Hz) along three axes to assess frequency- and axis-dependent variability. In the second experiment, four AX6 accelerometers were simultaneously placed on a subject’s wrist and tested under four human motion conditions (walking at 4 km·h<sup>−1</sup> and 6 km·h<sup>−1</sup> and running at 8 km·h<sup>−1</sup> and 10 km·h<sup>−1</sup>). Results demonstrated low intra- and inter-instrument variability (CVintra: 3.3–4.5%; CVinter: 6.3–7.7%) with high reliability (ICC = 0.98). Similar results were observed in human motion conditions (CVintra: 5.3–8.8%; CVinter: 7.1–10.4%), with ICC values of 0.98 for combined devices, and 0.99 for each device individually. Despite statistically significant differences (<i>p</i> < 0.05) between devices in human motion all conditions, the variations remained below the minimal clinically significant difference threshold. These findings indicate that under technical conditions on a vibrating platform, and within the range of typical human accelerations, the Axivity AX6 is a reliable tool for measuring accelerations representative of physical activity. However, further research is necessary to validate its performance under free-living conditions.https://www.mdpi.com/1424-8220/25/8/2480physical activityaccelerometryactivity monitorreliability |
| spellingShingle | Marcos Echevarría-Polo Pedro J. Marín Esther Pueyo Javier Ramos Maqueda Nuria Garatachea Variability and Reliability of the Axivity AX6 Accelerometer in Technical and Human Motion Conditions Sensors physical activity accelerometry activity monitor reliability |
| title | Variability and Reliability of the Axivity AX6 Accelerometer in Technical and Human Motion Conditions |
| title_full | Variability and Reliability of the Axivity AX6 Accelerometer in Technical and Human Motion Conditions |
| title_fullStr | Variability and Reliability of the Axivity AX6 Accelerometer in Technical and Human Motion Conditions |
| title_full_unstemmed | Variability and Reliability of the Axivity AX6 Accelerometer in Technical and Human Motion Conditions |
| title_short | Variability and Reliability of the Axivity AX6 Accelerometer in Technical and Human Motion Conditions |
| title_sort | variability and reliability of the axivity ax6 accelerometer in technical and human motion conditions |
| topic | physical activity accelerometry activity monitor reliability |
| url | https://www.mdpi.com/1424-8220/25/8/2480 |
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