Measurement error of rearfoot kinematics during running between a 100Hz and 30Hz camera

Ferber, Reed, Sheerin, Kelly, & Kendall, Karen (2009) Measurement error of rearfoot kinematics during running between a 100Hz and 30Hz camera. International SportMed Journal, 10(3), pp. 152-162.

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Background: Measurement accuracy is critical for biomechanical gait assessment. Very few studies have determined the accuracy of common clinical rearfoot variables between cameras with different collection frequencies.

Research question: What is the measurement error for common rearfoot gait parameters when using a standard 30Hz digital camera compared to 100Hz camera?

Type of study: Descriptive.

Methods: 100 footfalls were recorded from 10 subjects ( 10 footfalls per subject) running on a treadmill at 2.68m/s. A high-speed digital timer, accurate within 1ms served as an external reference. Markers were placed along the vertical axis of the heel counter and the long axis of the shank. 2D coordinates for the four markers were determined from heel strike to heel lift. Variables of interest included time of heel strike (THS), time of heel lift (THL), time to maximum eversion (TMax), and maximum rearfoot eversion angle (EvMax).

Results: THS difference was 29.77ms (+/- 8.77), THL difference was 35.64ms (+/- 6.85), and TMax difference was 16.50ms (+/- 2.54). These temporal values represent a difference equal to 11.9%, 14.3%, and 6.6% of the stance phase of running gait, respectively. EvMax difference was 1.02 degrees (+/- 0.46).

Conclusions: A 30Hz camera is accurate, compared to a high-frequency camera, in determining TMax and EvMax during a clinical gait analysis. However, relatively large differences, in excess of 12% of the stance phase of gait, for THS and THL variables were measured.

Impact and interest:

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1 citations in Web of Science®

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ID Code: 60068
Item Type: Journal Article
Refereed: Yes
Keywords: biomechanics, gait, sampling frequency, error analysis
ISSN: 1528-3356
Subjects: Australian and New Zealand Standard Research Classification > MEDICAL AND HEALTH SCIENCES (110000)
Divisions: Current > QUT Faculties and Divisions > Faculty of Health
Current > Schools > School of Exercise & Nutrition Sciences
Copyright Owner: Copyright 2009 International Federation of Sports Medicine
Deposited On: 20 May 2013 03:00
Last Modified: 30 Jun 2013 22:17

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