Design of Posture and Activity Detector (PAD)

In recent years, there has been much research and development of wearable devices using accelerometers for studying physical activity. Previously, we have described the development of the Posture and Activity Detector (PAD). After demonstrating success with PAD, we were motivated to improve the design by taking the device one step further and implementing all of these components on a single printed circuit board, adding a few additional features to make the system more flexible, and custom-designing an outer case. We have continued our efforts in improving PAD with respect to software development as well as making PAD more physically robust and mass producible. In this paper, the specifications for PAD will be outlined including its hardware and software components, and clinical research applications.

[1]  B.K. Gilbert,et al.  A miniaturized low power personal motion analysis logger utilizing MEMS accelerometers and low power microcontroller , 2005, 2005 3rd IEEE/EMBS Special Topic Conference on Microtechnology in Medicine and Biology.

[2]  Kenton R Kaufman,et al.  Precision and accuracy of an ankle-worn accelerometer-based pedometer in step counting and energy expenditure. , 2005, Preventive medicine.

[3]  Anthony Rowe,et al.  eWatch: a wearable sensor and notification platform , 2006, International Workshop on Wearable and Implantable Body Sensor Networks (BSN'06).

[4]  M. Clark,et al.  Interindividual Variation in Posture Allocation: Possible Role in Human Obesity , 2005, Science.

[5]  Barry K. Gilbert,et al.  Design of a Compact System Using a MEMS Accelerometer to Measure Body Posture and Ambulation , 2006, 19th IEEE Symposium on Computer-Based Medical Systems (CBMS'06).

[6]  G M Lyons,et al.  A description of an accelerometer-based mobility monitoring technique. , 2005, Medical engineering & physics.

[7]  B E Ainsworth,et al.  Validity of four motion sensors in measuring moderate intensity physical activity. , 2000, Medicine and science in sports and exercise.

[8]  Kuan Zhang,et al.  Measurement of human daily physical activity. , 2003, Obesity research.

[9]  J. D. Janssen,et al.  A triaxial accelerometer and portable data processing unit for the assessment of daily physical activity , 1997, IEEE Transactions on Biomedical Engineering.

[10]  Kuan Zhang,et al.  Improving energy expenditure estimation for physical activity. , 2004, Medicine and science in sports and exercise.

[11]  David R Bassett,et al.  Sources of variance in daily physical activity levels as measured by an accelerometer. , 2002, Medicine and science in sports and exercise.

[12]  D. Bassett,et al.  The technology of accelerometry-based activity monitors: current and future. , 2005, Medicine and science in sports and exercise.

[13]  Guy Plasqui,et al.  Measuring free-living energy expenditure and physical activity with triaxial accelerometry. , 2005, Obesity research.