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.
journal_name
J Sci Med Sportjournal_title
Journal of science and medicine in sportauthors
Li SN,Hobbins L,Morin JB,Ryu JH,Gaoua N,Hunter S,Girard Odoi
10.1016/j.jsams.2020.04.001subject
Has Abstractpub_date
2020-11-01 00:00:00pages
1111-1116issue
11eissn
1440-2440issn
1878-1861pii
S1440-2440(20)30080-3journal_volume
23pub_type
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journal_title:Journal of science and medicine in sport
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journal_title:Journal of science and medicine in sport
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journal_title:Journal of science and medicine in sport
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journal_title:Journal of science and medicine in sport
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journal_title:Journal of science and medicine in sport
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journal_title:Journal of science and medicine in sport
pub_type: 杂志文章,meta分析,评审
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journal_title:Journal of science and medicine in sport
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journal_title:Journal of science and medicine in sport
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