Running mechanics adjustments to perceptually-regulated interval runs in hypoxia and normoxia
| Autor: | Liam Hobbins, Nadia Gaoua, Olivier Girard, Steve Hunter, Siu Nam Li, Joong Hyun Ryu, Jean-Benoit Morin |
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| Rok vydání: | 2020 |
| Předmět: |
Adult
Male Physical Therapy Sports Therapy and Rehabilitation Instrumented treadmill Athletic Performance High-Intensity Interval Training Running 03 medical and health sciences Young Adult 0302 clinical medicine Oxygen Consumption medicine Humans Orthopedics and Sports Medicine 030212 general & internal medicine Exertion Treadmill Hypoxia Mathematics Constant velocity Repeated measures design 030229 sport sciences Mechanics Hypoxia (medical) Athletes Loading rate Exercise Test Female Analysis of variance medicine.symptom |
| Zdroj: | Journal of science and medicine in sport. 23(11) |
| ISSN: | 1878-1861 |
| Popis: | 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 ± 2.0 km.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 0.298) 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 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. |
| Databáze: | OpenAIRE |
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