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Running Velocity Does Not Influence Lower Limb Mechanical Asymmetry

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submitted on 2024-02-21, 06:35 and posted on 2024-02-21, 06:35 authored by Olivier Girard, Jean-Benoit Morin, Joong Ryu, Paul Read, Nathan Townsend

We examined the effect of running velocity upon magnitude and range of asymmetry in the main kinetics and kinematics of treadmill running at constant, submaximal velocities. Nine well-trained, un-injured distance runners ran, in a random order, at seven running velocities (10, 12.5, 15, 17.5, 20, 22.5 and 25 km.h-1) for 60 s (separated by > 90 s of rest) on an instrumented treadmill (ADAL3D-WR, Medical Development, France). Continuous measurement (1000 Hz) of spatio-temporal, horizontal force production and spring-mass characteristics was performed and data over 10 consecutive steps (5 right and 5 leg foot contacts after 50 s of running) were used for subsequent comparisons. Group mean and the range of asymmetry scores were assessed from the ‘symmetry angle’ (SA) formulae where a score of 0%/100% indicates perfect symmetry/asymmetry. Mean SA scores for spatio-temporal variables were lower than 2%: contact time (0.6±0.1%; range: 0.4–0.7%), aerial time (1.7±0.2%; range: 1.3–2.1%) as well as step length and step frequency (0.7±0.2%; range: 0.5–0.9%). Mean loading rate (5.3±1.1%; range: 4.1–6.9%) and spring mass model peak vertical force: 3.2±1.6% (range: 2.9–3.4%); maximal downward vertical displacement: 11.2±6.0% (range: 9.2–14.0%); leg compression: 3.6±1.9% (range: 2.9–5.6%); vertical stiffness: 8.8±1.9% (range: 7.1–11.6%); leg stiffness: 1.6±0.6% (range: 1.2–2.9%) presented larger mean SA values. Mean SA scores ranged 1-4% for duration of braking (1.3±0.3%; range: 0.9–2.0%) and push-off (1.6±0.9%; range: 1.2–2.4%) phases, peak braking (2.4±1.1%; range: 1.6–3.6%) and push-off (1.7±0.9%; range: 1.2–2.2%) forces as well as braking (3.7±2.0%; range: 2.8–5.8%) and push-off (2.1±0.8%; range: 1.3–2.6%) impulses. However, with the exception of braking impulse (P=0.005), there was no influence of running velocity on asymmetry scores for any of the mechanical variables studied (0.118

Other Information

Published in: Frontiers in Sports and Active Living
License: https://creativecommons.org/licenses/by/4.0/
See article on publisher's website: https://dx.doi.org/10.3389/fspor.2019.00036

Additional institutions affiliated with: Athlete Health and Performance Research Center - ASPETAR

Funding

Open Access funding provided by the Qatar National Library.

History

Language

  • English

Publisher

Frontiers

Publication Year

  • 2019

License statement

Copyright © 2019 Girard, Morin, Ryu, Read and Townsend. This Item is licensed under the Creative Commons Attribution 4.0 International License.

Institution affiliated with

  • Aspire Zone Foundation
  • Aspetar Orthopaedic and Sports Medicine Hospital - AZF
  • Aspire Academy - AZF

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