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Abstract Number: 2447

Accuracy of Sensewear MiniTM and Actigraph GT3XTM Accelerometers for Differentiating Sedentary and Light Physical Activities in a Controlled Laboratory Setting

April Y. F. Leung1, Lynne M. Feehan2, Cynthia Macdonald1, Jenny Leese3, Erin Carruthers4 and Linda C. Li5, 1Physical Therapy, University of British Columbia, Vancouver, BC, Canada, 2Physical Therapy, Arthritis Research Centre of Canada and University of British Columbia, Vancouver, BC, Canada, 3Arthritis Research Centre of Canada, Vancouver, BC, Canada, 4Arthritis Research Centre of Canada, Richmond, BC, Canada, 5Department of Physical Therapy, University of British Columbia, Vancouver, BC, Canada

Meeting: 2012 ACR/ARHP Annual Meeting

Keywords: inflammatory arthritis, outcome measures and physical activity

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Session Information

Title: ACR/ARHP Combined Rehabilitation Abstract Session

Session Type: Combined Abstract Sessions

Background/Purpose: People living with inflammatory arthritis are likely to be less physically active due to pain and fatigue.  To understand the relationship between physical inactivity and poor health outcomes in inflammatory arthritis, it is necessary to accurately identify and quantify lower levels of physical activity. Accelerometers are small activity monitors used to measure moderate and higher levels of physical activity.  However, it is unclear how accurately different monitors capture sedentary and light physical activities. The purpose of this study was to compare the accuracy of the SenseWear MiniTM (SW) and Actigraph GT3XTM (AG) accelerometers for differentiating between sedentary and non-sedentary/ light physical activities in a controlled laboratory setting.

Methods: 22 adults (F=15, M=7, mean age 35.7, range 19 to 72) volunteered to participate.  Both monitors were synchronized with Greenwich Mean Time and were set to collect data at 1-minute intervals. Participants were randomly assigned to perform 9 activities for 5 minutes each.  All activities were observed and timed.  The activities were performed in: 1) standing (**slow treadmill, **wash dishes, *text messaging), 2) sitting (**slow cycling, *watch television, **computer typing), and 3) lying down (*rest with music, *read book, *knee ROM exercise in lying). According to the 2011 Compendium of Physical Activities (CPA), 5 activities were defined as *sedentary (<1.6 METs) and 4 were defined as **non-sedentary/ light (1.6 to 3 METs).  The middle 3-minute interval from each 5-minute time period was analyzed. Each SW activity was categorized as sedentary (< 1.6 METs) or non-sedentary (> 1.6 METs) based on the SW proprietary MET data.  Each AG activity was categorized as sedentary or non-sedentary, based on 2 different sedentary cut-points (< 100 and < 589 activity counts/ minute) for the AG vertical axis data. 

Percentage of activities correctly identified as sedentary (sensitivity) and non-sedentary (specificity), proportion of all activities identified as sedentary or non-sedentary that were in fact sedentary (positive predictive value – PPV) or non-sedentary (negative predictive value – NPV),  as well as, the positive (LR+) and negative (LR-) likelihood ratios were calculated for both accelerometers.

Results: Compared against derived values from the 2011 Compendium of Physical Activities, SW performed notably better than AG in differentiating between sedentary and non-sedentary/ light physical activities under controlled laboratory settings (Table 1).  Accuracy of AG was not affected by the cut-point chosen.

Conclusion:  Our results suggest that SenseWear Mini may be a better accelerometer for objective measurements of low physical activity in people with inflammatory arthritis.  Further studies are needed to examine the accuracy of SenseWear Mini for measuring physical activity under free-living conditions.

Table 1: Summary of measurement accuracy of SenseWear Mini and Actigraph GTX3 compared with the Compendium of Physical Activities

SenseWear Mini

Actigraph GTX3
(<100 activity counts/ minute)

Actigraph GTX3
(<589 activity counts/ minute)

Sensitivity  (Sedentary)

0.98

1.00

1.00

Specificity (Non-Sedentary)

0.70

0.27

0.11

PPV (Sedentary)

0.81

0.63

0.59

NPV (Non-Sedentary)

0.97

1.00

1.00

LR+ (Sedentary)

3.32

1.38

1.13

LR- (Non-Sedentary)

0.03

0.00

0.00


Disclosure:

A. Y. F. Leung,
None;

L. M. Feehan,
None;

C. Macdonald,
None;

J. Leese,
None;

E. Carruthers,
None;

L. C. Li,
None.

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