An ambulatory system for physical activity monitoring in elderly

Author

Najafi, B. ; Aminian, K. ; Loew, F. ; Blanc, Y. ; Rober, Ph

Author_Institution

Metrol. Lab., Swiss Fed. Inst. of Technol., Lausanne, Switzerland

fYear

2000

fDate

2000

Firstpage

562

Lastpage

566

Abstract

A new method of physical activity monitoring is presented, which is able to detect body postures (sitting, standing and lying) and walking period in the elderly from only one kinematic sensor attached to the chest. Wavelet analysis in conjunction with a simple kinematics model was used to recognize different postural transitions and walking periods during daily physical activity. The method was tested on 11 elderly subjects (all community walkers) in a gait laboratory where an optical motion system (Vicon) was used as reference. A close correspondence was found between the two systems. The efficiency of the system for ambulatory monitoring outside of the laboratory was tested on 3 old subjects. High sensitivity (>90%) was obtained for the classification of usual physical activities

Keywords

biomedical equipment; geriatrics; kinematics; patient monitoring; wavelet transforms; Vicon; community walkers; daily physical activity; elderly subjects; gait laboratory; kinematic sensor; optical motion system; physical activity monitoring method; postural transitions; simple kinematics model; usual physical activities classification; walking periods; wavelet analysis; Accelerometers; Discrete wavelet transforms; Hospitals; Kinematics; Laboratories; Legged locomotion; Monitoring; Senior citizens; Sensor systems; System testing;

fLanguage

English

Publisher

ieee

Conference_Titel

Microtechnologies in Medicine and Biology, 1st Annual International, Conference On. 2000

Conference_Location

Lyon

Print_ISBN

0-7803-6603-4

Type

conf

DOI

10.1109/MMB.2000.893847

Filename

893847