Low-frequency accelerations over-estimate impact-related shock during walking.

Journal article

James, DC, Mileva, K. and Cook, DP (2014). Low-frequency accelerations over-estimate impact-related shock during walking. Journal of Electromyography and Kinesiology. 24 (2), pp. 264-270. https://doi.org/10.1016/j.jelekin.2013.12.008
AuthorsJames, DC, Mileva, K. and Cook, DP
Abstract

During gait, a failure to acknowledge the low-frequency component of a segmental acceleration signal will result in an overestimation of impact-related shock and may lead to inappropriately drawn conclusions. The present study was undertaken to investigate the significance of this low-frequency component in two distinctly different modalities of gait: barefoot (BF) and shod (SHOD) walking. Twenty-seven participants performed five walking trials at self-selected speed in each condition. Peak positive accelerations (PPA) at the shank and spine were first derived from the time-domain signal. The raw acceleration signals were then resolved in the frequency-domain and the active (low-frequency) and impact-related components of the power spectrum density (PSD) were quantified. PPA was significantly higher at the shank (P<0.0001) and spine (P=0.0007) in the BF condition. In contrast, no significant differences were apparent between conditions for shank (P=0.979) or spine (P=0.178) impact-related PSD when the low-frequency component was considered. This disparity between approaches was due to a significantly higher active PSD in both signals in the BF condition (P<0.0001; P=0.008, respectively), due to kinematic differences between conditions (P<0.05). These results indicate that the amplitude of the low-frequency component of an acceleration signal during gait is dependent on knee and ankle joint coordination behaviour, and highlight that impact-related shock is more accurately quantified in the frequency-domain following subtraction of this component.

KeywordsMuscle, Skeletal; Ankle Joint; Knee Joint; Humans; Gait; Walking; Acceleration; Shoes; Adult; Female; Male; Young Adult; Biomechanical Phenomena; Barefoot; Gait; Heel-strike; Kinematics; Shock; Acceleration; Adult; Ankle Joint; Biomechanical Phenomena; Female; Gait; Humans; Knee Joint; Male; Muscle, Skeletal; Shoes; Walking; Young Adult; 1106 Human Movement And Sports Science; Sport Sciences
Year2014
JournalJournal of Electromyography and Kinesiology
Journal citation24 (2), pp. 264-270
PublisherElsevier
ISSN1873-5711
Digital Object Identifier (DOI)https://doi.org/10.1016/j.jelekin.2013.12.008
Publication dates
Print09 Jan 2014
Publication process dates
Deposited31 May 2018
Accepted26 Dec 2013
Accepted author manuscript
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