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Load Magnitude and Locomotion Pattern Alter Locomotor System Function in Healthy Young Adult Women

Krajewski, Kellen T.; Dever, Dennis E.; Johnson, Camille C.; Mi, Qi; Simpson, Richard J.; Graham, Scott M.; Moir, Gavin L.; Ahamed, Nizam U.; Flanagan, Shawn D.; Anderst, William J.; Connaboy, Chris

Authors

Kellen T. Krajewski

Dennis E. Dever

Camille C. Johnson

Qi Mi

Richard J. Simpson

Scott M. Graham

Gavin L. Moir

Nizam U. Ahamed

Shawn D. Flanagan

William J. Anderst

Chris Connaboy



Abstract

Introduction: During cyclical steady state ambulation, such as walking, variability in stride intervals can indicate the state of the system. In order to define locomotor system function, observed variability in motor patterns, stride regulation and gait complexity must be assessed in the presence of a perturbation. Common perturbations, especially for military populations, are load carriage and an imposed locomotion pattern known as forced marching (FM). We examined the interactive effects of load magnitude and locomotion pattern on motor variability, stride regulation and gait complexity during bipedal ambulation in recruit-aged females. Methods: Eleven healthy physically active females (18-30 years) completed one-minute trials of running and FM at three load conditions: no additional weight/bodyweight (BW), an additional 25% of BW (BW+25%), and an additional 45% of BW (BW+45%). A goal equivalent manifold (GEM) approach was used to assess motor variability yielding relative variability (RV; ratio of ‘good’ to ‘bad’ variability) and detrended fluctuation analysis (DFA) to determine gait complexity on stride length (SL) and stride time (ST) parameters. DFA was also used on GEM outcomes to calculate stride regulation. Results: There was a main effect of load (p=.01) on RV; as load increased, RV decreased. There was a main effect of locomotion (p=.01), with FM exhibiting greater RV than running. Strides were regulated more tightly and corrected quicker at BW+45% compared (p

Citation

Krajewski, K. T., Dever, D. E., Johnson, C. C., Mi, Q., Simpson, R. J., Graham, S. M., Moir, G. L., Ahamed, N. U., Flanagan, S. D., Anderst, W. J., & Connaboy, C. (2020). Load Magnitude and Locomotion Pattern Alter Locomotor System Function in Healthy Young Adult Women. Frontiers in Bioengineering and Biotechnology, 8, https://doi.org/10.3389/fbioe.2020.582219

Journal Article Type Article
Acceptance Date Aug 19, 2020
Online Publication Date Sep 16, 2020
Publication Date Sep 16, 2020
Deposit Date Sep 11, 2020
Publicly Available Date Sep 11, 2020
Electronic ISSN 2296-4185
Publisher Frontiers Media
Peer Reviewed Peer Reviewed
Volume 8
DOI https://doi.org/10.3389/fbioe.2020.582219
Keywords complexity, motor variability, load carriage, motor control, regulation, biomechanics, gait
Public URL http://researchrepository.napier.ac.uk/Output/2685868

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Load Magnitude And Locomotion Pattern Alter Locomotor System Function In Healthy Young Adult Women (published version) (1 Mb)
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Publisher Licence URL
http://creativecommons.org/licenses/by/4.0/

Copyright Statement
This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY).


Load Magnitude And Locomotion Pattern Alter Locomotor System Function In Healthy Young Adult Women (accepted version) (1 Mb)
PDF

Publisher Licence URL
http://creativecommons.org/licenses/by/4.0/

Copyright Statement
This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY).





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