Detection of Lying Down, Sitting, Standing, and Stepping Using Two ActivPAL Monitors

The activPAL is an accelerometer-based monitor worn on the thigh that classifies daily activities into three categories (sitting/lying down, standing, and stepping). The monitor discriminates between sitting/lying and the upright position by detecting the inclination of the thigh. It detects steppin...

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Veröffentlicht in:Medicine and science in sports and exercise 2014-10, Vol.46 (10), p.2025-2029
Hauptverfasser: BASSETT, DAVID R, JOHN, DINESH, CONGER, SCOTT A, RIDER, BRIAN C, PASSMORE, RYAN M, CLARK, JUSTIN M
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Sprache:eng
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Zusammenfassung:The activPAL is an accelerometer-based monitor worn on the thigh that classifies daily activities into three categories (sitting/lying down, standing, and stepping). The monitor discriminates between sitting/lying and the upright position by detecting the inclination of the thigh. It detects stepping from the acceleration versus time wave form. However, a current limitation of the activPAL is that it does not discriminate between sitting and lying down. PURPOSEThis study aimed to determine whether placing a second activPAL monitor on the torso would allow the detection of seated versus lying postures. METHODSFifteen healthy adults (18–55 yr of age) wore an activPAL on the right thigh and another activPAL over the right rib cage. Both monitors were synchronized and initialized to record data in 15-s epochs. Participants performed a semistructured routine of activities for 3 min each. Activities included lying down (while supine, prone, and on the side), sitting, standing, sweeping, treadmill walking at 3 mph, and treadmill running at 6 mph. The spatial orientation of the thigh and chest monitors was used to determine body posture, and the activPAL on the thigh was used to detect ambulation. RESULTSThe use of two activPAL devices enabled four behaviors to be accurately classified. The percentages of observations that were classified accurately were as followslying down (100%), sitting (100%), standing/light activity in the upright position (90.8%), and stepping (100%). CONCLUSIONSThe current method allows researchers to obtain more detailed information on postural allocation compared with that in the use of a single activPAL on the thigh.
ISSN:0195-9131
1530-0315
DOI:10.1249/MSS.0000000000000326