Sedentary Sphere: A method for the analysis, identification and visual presentation of raw acceleration data from triaxial accelerometers
(GENEActiv, ActivInsights, Cambs, UK)
These custom built Excel spreadsheets enable the calculation of the most likely posture from 15 s epoch data from a wrist or thigh-worn triaxial accelerometer.
These custom built Excel spreadsheets enable the calculation of the most likely posture from 15 s epoch data from a wrist or thigh-worn triaxial accelerometer. The 15 s epoch values for the x, y and z vectors are the mean acceleration over the epoch (expressed in g and retaining the gravity vector), whereas the 15 s epoch vector magnitude values are the summed acceleration values over the epoch, corrected for gravity (this is the output created when converting raw GENEActiv output to 15-s epoch files with the GENEActiv PC software. Full instructions are provided in the second tab of the template.
- Wrist-worn wrist_Posture_7day_Template.xltx: Postures = sitting/lying, standing
- Thigh-worn 15s thigh template calc.xlsx: Postures = sitting/lying back, sitting/lying front, sitting/lying side, standing)
Rowlands, A.V., Olds, T.S., Hillsdon, M., Pulsford, R., Hurst, T.L., Eston, R.G., Gomersall, S.R., Johnston, K., Langford, J. (2014). Assessing sedentary behaviour with the GENEActiv: Introducing the Sedentary Sphere. Medicine and Science in Sports and Exercise, 46, 1235-1247.
Rowlands, A.V., Yates, T., Olds, T.S., Davies, M., Khunti, K., Edwardson, C.E. (2015). Wrist-worn accelerometer-brand independent posture classification. Medicine and Science in Sports and Exercise. DOI: 10.1249/MSS.0000000000000813.
Edwardson, C.L., Rowlands, A.V., Bunnewell, S., Sanders, J., Esliger, D., Gorely, T., O’Connell, S., Davies, M., Khunti, K., Yates, T. Accuracy of posture allocation algorithms for thigh and waist-worn accelerometers. Medicine and Science in Sports and Exercise. Under review.
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