Emulating constant acceleration locomotion mechanics on a treadmill

Farris, Dominic (2016) Emulating constant acceleration locomotion mechanics on a treadmill. Journal of Biomechanics, 49 5: 653-658. doi:10.1016/j.jbiomech.2016.01.030

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Author Farris, Dominic
Title Emulating constant acceleration locomotion mechanics on a treadmill
Journal name Journal of Biomechanics   Check publisher's open access policy
ISSN 1873-2380
0021-9290
Publication date 2016-03
Sub-type Article (original research)
DOI 10.1016/j.jbiomech.2016.01.030
Volume 49
Issue 5
Start page 653
End page 658
Total pages 6
Place of publication Oxford, United Kingdom
Publisher Pergamon Press
Collection year 2017
Language eng
Formatted abstract
Locomotion on an accelerating treadmill belt is not dynamically similar to overground acceleration. The purpose of this study was to test if providing an external force to compensate for inertial forces during locomotion on an accelerating treadmill belt could induce locomotor dynamics similar to real accelerations. Nine males (mean±sd age=26±4 years, mass=81±9 kg, height=1.8±0.05 m) began walking and transitioned to running on an accelerating instrumented treadmill belt at three accelerations (0.27 m s−2, 0.42 m s−2, 0.76 m s−2). Half the trials were typical treadmill locomotion (TT) and half were emulated acceleration (EA), where elastic tubing harnessed to the participant provided a horizontal force equal to mass multiplied by acceleration. Net mechanical work (WCOM) and ground reaction force impulses (IGRF) were calculated for individual steps and a linear regression was performed with these experimental measures as independent variables and theoretically derived values of work and impulse as predictor variables. For EA, linear fits were significant for WCOM (y=1.19x+10.5, P<0.001, R2=0.41) and IGRF (y=0.95x+8.1, P<0.001, R2=0.3). For TT, linear fits were not significant and explained virtually no variance for WCOM (y=0.06x+1.6, P=0.29, R2<0.01) and IGRF (y=0.10x+0.4, P=0.06, R2=0.01). This suggested that the EA condition was a better representation of real acceleration dynamics than TT. Running steps from EA where work and impulse closely matched theoretical values showed similar adaptations to increasing acceleration as have been previously observed overground (forward reorientation of GRF vector without an increase in magnitude or change in spatio-temporal metrics).
Keyword Walking
Running
Acceleration
Treadmill
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: HERDC Pre-Audit
School of Human Movement and Nutrition Sciences Publications
 
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Created: Thu, 11 Feb 2016, 14:07:56 EST by Dominic James Farris on behalf of School of Human Movement and Nutrition Sciences