Low-frequency accelerations over-estimate impact-related shock during walking.
James, DC, Mileva, KN and Cook, DP (2014). Low-frequency accelerations over-estimate impact-related shock during walking. Journal of Electromyography and Kinesiology. 24 (2), pp. 264-270.
|Authors||James, DC, Mileva, KN and Cook, DP|
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.
|Keywords||Muscle, 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|
|Journal||Journal of Electromyography and Kinesiology|
|Journal citation||24 (2), pp. 264-270|
|Digital Object Identifier (DOI)||doi:10.1016/j.jelekin.2013.12.008|
|09 Jan 2014|
|Publication process dates|
|Deposited||31 May 2018|
|Accepted||26 Dec 2013|
|Accepted author manuscript|
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