Calibration of an instrumented couch with a motioncapture system in measuring force applied and distance during manual therapy

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Published: Feb 1, 2019
Keywords:
Instrumented Couch Manual Therapy Forces Applied

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Adit Chiradejnant
Department of Physical Therapy, Faculty of Allied Health Sciences, Chulalongkorn University, Bangkok, THAILAND
Duangporn Suriyaamarit
Department of Physical Therapy, Faculty of Allied Health Sciences, Chulalongkorn University, Bangkok, THAILAND
Mathawee Kaewprasert
Physical Therapy Unit, Office of the Director of Vajira Hospital, Faculty of Medicine Vajira Hospital, Navamindradhiraj University, Bangkok, THAILAND

Abstract

Objective: This study aimed to (i) describe an instrumented couch which would be able to synchronize with the motion-capture system in details; (ii) calibrate this device in measuring applied forces on its surface and distance.


Study design: The criterion-related validity and test-retest reliability.


Methods: The criterion-related validity and reliability of the couch were investigated in two


conditions: empty couch and a couch with dead weight of known mass 70 kg., in three directions (vertical, medial-lateral and caudad-cephalad directions). The motion-capture system was also investigated by using the grid paper size 40×40 cm2. Pearson’s correlation and the intraclass correlation coefficient (2, 1) were used to analyze the validity and the reliability of the couch in measuring the applied force and motion-capture system in measuring the distance. The percentage error was calculated for both the couch and the motion-capture system.


Results: The Pearson’s correlation of the couch and the motion-capture system in this study was 1.00 (p<0.05). The intraclass correlation coefficient (2, 1) of the couch was 1.00 (p<0.05). The average percentage error of the couch in measuring the applied force and the motioncapture system in measuring the distance ranged from 0.41-1.12% and 0%, respectively.


Conclusion: The instrumented couch and the motion-capture system are appropriate to investigate both amount of force applied and displacement during manual therapy.

Article Details

How to Cite
Chiradejnant, A., Suriyaamarit, D., & Kaewprasert, M. (2019). Calibration of an instrumented couch with a motioncapture system in measuring force applied and distance during manual therapy. Vajira Medical Journal : Journal of Urban Medicine, 63(1), 1–8. Retrieved from https://he02.tci-thaijo.org/index.php/VMED/article/view/210961
Issue
Vol. 63 No. 1 (2019): JAN - FEB 2019
Section
Original Articles

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