Mechanical asymmetries remain low-to-moderate during 30 min of self-paced treadmill running.

Autor:	Mtibaa K; College of Health and Life Sciences, Hamad Bin Khalifa University, Doha, Qatar., Zarrouk N; Education, Motricity, Sports and Health, High Institute of Sport and Physical Education of Sfax, Sfax, Tunisia., Ryu JH; Sports Science Department, Aspire Academy, Doha, Qatar., Racinais S; Research and Scientific Support, Aspetar Orthopaedic and Sports Medicine Hospital, Doha, Qatar., Girard O; Research and Scientific Support, Aspetar Orthopaedic and Sports Medicine Hospital, Doha, Qatar.; Exercise and Sport Science Department, School of Human Sciences, The University of Western Australia, Perth, WA, Australia.
Jazyk:	angličtina
Zdroj:	Frontiers in physiology [Front Physiol] 2023 Dec 18; Vol. 14, pp. 1289172. Date of Electronic Publication: 2023 Dec 18 (Print Publication: 2023).
DOI:	10.3389/fphys.2023.1289172
Abstrakt:	Introduction: We characterized the magnitude and range of gait asymmetry during self-paced treadmill running. Methods: On an instrumented treadmill, twelve trained runners (11 males, 1 female) completed a 30-min self-paced run, during which participants were instructed to cover the most distance possible. Ground reaction force recordings at a constant velocity corresponding to 70% of their maximal aerobic velocity (13.3 ± 0.8 km.h -1 ) allowed for the measurement of running kinetics and kinematics, as well as the calculation of spring-mass characteristics at the beginning, middle, and end of the run (minutes 1, 14, and 29, respectively). Group mean asymmetry scores were assessed using the "symmetry angle" (SA) formulae, where scores of 0% and 100% represent perfect symmetry and perfect asymmetry, respectively. Results: There was no time effect on SA scores for any of the 13 biomechanical variables ( p ≥ 0.128). Mean SA scores were <2.5% for contact time (0.8% ± 0.7%), flight time (1.4% ± 0.6%), step frequency (0.7% ± 0.3%), duty factor (0.7% ± 0.3%), duration of braking (1.3% ± 0.7%) and push-off phases (0.9% ± 0.8%), as well as peak braking (2.3% ± 1.3%) and push-off forces (1.4% ± 0.9%). Mean SA scores were ≥2.5% for peak vertical loading rate (3.1% ± 1.7%), mean vertical loading rate (3.4% ± 2.1%), peak vertical forces (2.9% ± 2.2%), as well as vertical stiffness (5.2% ± 3.5%) and leg stiffness (2.5% ± 1.5%). Conclusion: Throughout a 30-min running time trial, there were consistently low-to-moderate mechanical asymmetries for spatiotemporal variables, kinetics, and spring-mass model characteristics. This suggests that trained runners maintained relatively even strides during the self-paced treadmill run, with lower extremities behaving similarly when controlling for velocity. Competing Interests: The authors declare that the research was conducted in the absence of any commercial or financial relationships that could be construed as a potential conflict of interest. The author(s) declared that they were an editorial board member of Frontiers, at the time of submission. This had no impact on the peer review process and the final decision. (Copyright © 2023 Mtibaa, Zarrouk, Ryu, Racinais and Girard.)
Databáze:	MEDLINE
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