Running mechanics adjustments to perceptually-regulated interval runs in hypoxia and normoxia

Journal article

Li, S.N., Hobbins, L., Morin, J-B., Ryu, J.H., Gaoua, N., Hunter, S. and Girard, O. (2020). Running mechanics adjustments to perceptually-regulated interval runs in hypoxia and normoxia. Journal of Science and Medicine in Sport. 23 (11), pp. 1111-1116. https://doi.org/10.1016/j.jsams.2020.04.001
AuthorsLi, S.N., Hobbins, L., Morin, J-B., Ryu, J.H., Gaoua, N., Hunter, S. and Girard, O.
Abstract Objectives We determined whether perceptually-regulated, high-intensity intermittent runs in hypoxia and normoxia induce similar running mechanics adjustments within and between intervals. Design Within-participants repeated measures. Methods Nineteen trained runners completed a high-intensity intermittent running protocol (4×4-min intervals at a perceived rating exertion of 16 on the 6–20 Borg scale, 3-min passive recoveries) in either hypoxic (FiO2 =0.15) or normoxic (FiO2 =0.21) conditions. Running mechanics were collected over 10 consecutive steps, at constant velocity (∼15.0±2.0km.h−1), at the beginning and the end of each 4-min interval. Repeated measure ANOVA were used to assess within intervals (onset vs. end of each interval), between intervals (interval 1, 2, 3 vs. 4) and FiO2 (0.15 vs. 0.21) main effects and any potential interaction. Results Participants progressively reduced running velocity from interval 1–4, and more so in hypoxia compared to normoxia for intervals 2, 3 and 4 (P <0.01). There were no between intervals (across all intervals P >0.298) and FiO2 (across all intervals P >0.082) main effects or any significant between intervals×within intervals×FiO2 interactions (all P >0.098) for any running mechanics variables. Irrespective of interval number or FiO2, peak loading rate (+10.6±7.7%; P <0.001) and duration of push-off phase (+2.0±3.1%; P =0.001) increased from the onset to the end of 4-min intervals, whereas peak push-off force decreased (−4.0±4.0%; P <0.001). Conclusions When carrying out perceptually-regulated interval treadmill runs, runners adjust to progressively slower velocities in hypoxia compared to normoxia. However, only subtle constant-velocity modifications of their mechanical behaviour occurred within each set, independently of FiO2 or interval number.
Year2020
JournalJournal of Science and Medicine in Sport
Journal citation23 (11), pp. 1111-1116
PublisherElsevier
ISSN14402440
Digital Object Identifier (DOI)https://doi.org/10.1016/j.jsams.2020.04.001
Funder/ClientQNRF
Publication dates
Print15 Apr 2020
Online07 Oct 2020
Publication process dates
Deposited05 Aug 2020
Accepted03 Apr 2020
Accepted author manuscript
License
File Access Level
Open
Licensehttp://creativecommons.org/licenses/by-nc-nd/4.0/
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