Key measurement principles to strengthen the reliability of loading device technologies: Implications to health care practice
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Physiotherapy Program, School of Rehabilitation, Faculty of Health Sciences, Universiti Kebangsaan Malaysia, Kuala Lumpur, Malaysia
Faculty of Health Sciences, Universiti Kebangsaan Malaysia, Kuala Lumpur, Malaysia
Department of ECE, Bharathiyar College of Engineering and Technology, Pondicherry University, Tamilnadu, India
Submission date: 2015-06-24
Acceptance date: 2016-01-23
Online publication date: 2016-03-09
Publication date: 2020-03-24
Corresponding author
Leonard H. Joseph   

Physiotherapy Program, School of Rehabilitation Sciences, Faculty of Health Sciences, Universiti Kebangsaan Malaysia, 5th Floor, Bangunan Yayasan Selangor, Jalan Raja Muda Abdul Aziz, 50300 Kuala Lumpur, Malaysia. Tel.: +60 196 781 935.
Pol. Ann. Med. 2016;23(2):123-128
In practice, reliability of the load measurement device is carried out as a standard practice prior to data collection to eliminate errors in measurement. However, reliability alone cannot confirm the goodness of a measurement device. The other key measurement variables such as accuracy, hysteresis, eccentricity error, uncertainty could affect the device output. This study highlights the importance of several key measurement principles to strengthen the reliability of loading device technologies in health care practice.

To describes a method of testing the key measurement principles necessary to test the goodness of a load measurement technology at clinical or research setting.

Material and methods:
A customized load measurement device was used to elucidate the calibration procedure. To determine the accuracy and hysteresis, a series of ten equally spaced standard loads ranging 10–100 kg was applied from no load to maximum load over device platform. The applied loads were removed in the same order as initially placed. In addition, the repeatability was tested with a load of 20 kg for five trials. Furthermore, the eccentricity error was determined by applying loads over five different quadrants.

Results and discussion:
The result of the method demonstrated that the device has excellent accuracy and repeatability, with no errors in hysteresis, uncertainty, eccentricity.

In addition to reliability, the other proposed key measurement variables are proven essential to test the goodness of a loading device in research and clinical practice.

This study was supported by FRGS/1/2013/SKK10/UKM/03/1. The grant funding had no role in the study design, data collection, analysis, or with writing of this manuscript.
No authors had any financial or personal relationships with other people or organizations that could have influenced this study.
Bartlett H, Bingham J, Ting LH. Validation and calibration of the Wii Balance Board as an inexpensive force plate. Am Soc Biomech. 2012;1(2):3–4.
Kumar SN, Omar B, Htwe O, et al. Reliability, agreement, and validity of digital weighing scale with MatScan in limb load measurement. J Rehabil Res Dev. 2014;51(4):591–598.
Hurkmans HLP, Bussmann JBJ, Benda E, Verhaar JAN, Stam HJ. Techniques for measuring weight bearing during standing and walking. Clin Biomech (Bristol Avon). 2003;18(7):576–589.
Clark RA, Bryant AL, Pua Y, McCrory P, Bennell K, Hunt M. Validity and reliability of the Nintendo Wii Balance Board for assessment of standing balance. Gait Posture. 2010;31(3):307–310.
Bobbert MF, Schamhardt HC. Accuracy of determining the point of force application with piezoelectric force plates. J Biomech. 1990;23(7):705–710.
Chockalingam N, Giakas G, Iossifidou A. Do strain gauge force platforms need in situ correction? Gait Posture. 2002;16(3):233–237.
Faber GS, Chang CC, Kingma I, et al. A force plate based method for the calibration of force/torque sensors. J Biomech. 2012;45(7):1332–1338.
Hall MG, Fleming HE, Dolan MJ, Millbank SFD, Paul JP. Static in situ calibration of force plates. J Biomech. 1996;29(5):659–665.
Clarkson DM. Patient weighing: standardisation and measurement. Nurs Stand. 2012;26(29):33–37.
The Institute of Measurement and Control. A Code of Practice for the Calibration of Industrial Process Weighing Systems. London: Institute of Measurement and Control; 2011.
Morse D, Baer DM. Laboratory balances: how they work, checking their accuracy. Lab Med. 2004;35(1):48–51.
Bell S. A Beginner's Guide to Uncertainty of Measurement. Teddington, Middlesex: National Physical Laboratory; 2001.
Preumont A. Mechatronics: Dynamics of Electromechanical and Piezoelectric Systems. Dordrecht: Springer Science & Business Media; 2006.
Webster JG, Eren H. Measurement, Instrumentation, and Sensors Handbook: Spatial, Mechanical, Thermal, and Radiation Measurement. Boca Raton: CRC Press; 2014.
ISO/IEC 17025:1999. General requirements for the competence of testing and calibration laboratories.
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