Assessing sedentary behavior with the GENEActiv: introducing the sedentary sphere

Rowlands, Alex V., Olds, Tim S., Hilldson, Melvyn, Pulsford, Richard, Hurst, Tina L., Eston, Roger G., Gomersall, Sjaan R., Johnston, Kylie and Langford, Joss (2014) Assessing sedentary behavior with the GENEActiv: introducing the sedentary sphere. Medicine and Science in Sport and Exercise, 46 6: 1235-1247. doi:10.1249/MSS.0000000000000224

Author Rowlands, Alex V.
Olds, Tim S.
Hilldson, Melvyn
Pulsford, Richard
Hurst, Tina L.
Eston, Roger G.
Gomersall, Sjaan R.
Johnston, Kylie
Langford, Joss
Title Assessing sedentary behavior with the GENEActiv: introducing the sedentary sphere
Journal name Medicine and Science in Sport and Exercise   Check publisher's open access policy
ISSN 0195-9131
Publication date 2014-06-01
Year available 2013
Sub-type Article (original research)
DOI 10.1249/MSS.0000000000000224
Open Access Status Not yet assessed
Volume 46
Issue 6
Start page 1235
End page 1247
Total pages 13
Place of publication Philadelphia, United States
Publisher Lippincott Williams & Wilkins
Language eng
Formatted abstract
Background: The Sedentary Sphere is a method for the analysis, identification and visual presentation of sedentary behaviours from a wrist-worn triaxial accelerometer.

To introduce the concept of the Sedentary Sphere, and to determine the accuracy of posture classification
from wrist accelerometer data.

Methods: Three samples were used: 1) free-living (N=13, aged 20-60y); 2) laboratory-based (N=25, aged 30-65y); 3) hospital in-patients (N=10, aged 60- 90y). All participants wore a GENEActiv on their wrist and activPAL on their thigh. The freeliving sample wore an additional GENEActiv on the thigh and completed the Multimedia Activity Recall for Children & Adults (MARCA). The laboratory-based sample wore the monitors while seated at a desk for seven hours, punctuated by two minutes of walking every 20 minutes. The free-living and in-patient samples wore the monitors for 24 h. Posture was classified from wrist-worn accelerometry using the Sedentary Sphere concept.

Results: Sitting time did not differ between the wrist GENEActiv and the activPAL in the free-living sample and was correlated
in the three samples combined (rho=0.9, p<0.001), free-living and in-patient samples (r≃0.8, p<0.01). Mean intra-individual agreement was 85±7%. In the laboratory-based and in-patient samples, sitting time was underestimated by the wrist GENEActiv by 30 minutes and two hours relative to the activPAL, respectively (p<0.05). Posture classification disagreed during reading while standing, cooking standing and brief periods during driving. Posture allocation validity was excellent when the GENEActiv was worn on the thigh, evidenced by near perfect agreement with the activPAL (96±3%).

Conclusion: The Sedentary Sphere enables determination of the most likely posture from the wrist-worn GENEActiv. Visualising behaviours on the Sphere displays the pattern of wrist movement and positions within that behaviour.
Keyword Sitting
Triaxial accelerometer
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ
Additional Notes Published online ahead of print 20 November 2013

Document type: Journal Article
Sub-type: Article (original research)
Collections: Official 2014 Collection
School of Human Movement and Nutrition Sciences Publications
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Citation counts: TR Web of Science Citation Count  Cited 23 times in Thomson Reuters Web of Science Article | Citations
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Created: Wed, 08 Jan 2014, 22:22:34 EST by Sjaan Gomersall on behalf of School of Human Movement and Nutrition Sciences