Authors:
Noriaki Ikeda
1
;
Kai Ishida
1
;
Yoshitaka Shiba
1
;
Kousuke Mizuno
2
;
Noritaka Mamorita
3
and
Akihiro Takeuchi
1
Affiliations:
1
Kitasato University, Japan
;
2
Kitasato University East Hospital, Japan
;
3
Hokkaido Institute of Technology, Japan
Keyword(s):
Bluetooth, iphone/ipod, Posture Measurement, Physical Therapy.
Related
Ontology
Subjects/Areas/Topics:
Ad Hoc Networks
;
Application Domains
;
Applications and Uses
;
Biomedical Engineering
;
Data Manipulation
;
Health Information Systems
;
Healthcare
;
Multi-Sensor Data Processing
;
Programming and Middleware
;
Sensor Networks
;
Simulation and Modeling
;
Software and Architectures
;
Wireless Information Networks
Abstract:
A smartphone-based measurement system was developed for the purpose of measuring time series data for posture in the physical therapy field. We used the iPod touch (Apple Inc.) as hardware and iOS SDK as a software development tool. Posture data (pitch, roll and yaw) were taken directly from Euler angles or by transformation from quaternion data (qw, qx, qy, qz) to the Euler angles, depending on the orientation of the device. This approach allows continuity of data values. Data were stored in the Documents directory of the iOS Appli as a file in CSV format, which can be transferred to a PC via iTunes or sent by email as an attached file if a WiFi environment is available. In order to synchronize two devices, communication via Bluetooth was implemented. The accuracy of the data was checked by comparing with the OPTOTRAK data. Variation of posture while standing still and walking was recorded using this system for 50 elderly subjects.