Energetically optimal stride frequency is maintained with fatigue in trained ultramarathon runners.
Objectives: At a given running speed, humans naturally endeavor to achieve an optimal stride frequency that minimizes metabolic cost. Research has suggested that runners select this near optimal stride frequency in some process of self-optimization even during fatiguing tasks up to 1-h of high-inten...
| Publicado en: | Journal of Science & Medicine in Sport Vol. 22; no. 9; pp. 1054 - 1059 |
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| Autores principales: | , , , |
| Formato: | Journal Article |
| Publicado: |
Elsevier B.V.
Sep2019
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| Acceso en línea: | Ver este registro en EBSCOhost |
| fields | @attributes: recordID: 1 pdfLink: plink: https://search.ebscohost.com/login.aspx?direct=true&db=ccm&AN=137748240&site=ehost-live header: @attributes: shortDbName: ccm uiTerm: 137748240 longDbName: CINAHL Complete uiTag: AN controlInfo: bkinfo: dissinfo: jinfo: jid: 14402440 1FKA jtl: Journal of Science & Medicine in Sport issn: 14402440 maglogo: N pubinfo: dt: Sep2019 vid: 22 iid: 9 pid: 467 pub: Elsevier B.V. place: New York, New York artinfo: ui: 137748240 137748240 NLM31029549 10.1016/j.jsams.2019.04.003 NLM31029549 137748240 ppf: 1054 ppct: 5 formats: tig: atl: Energetically optimal stride frequency is maintained with fatigue in trained ultramarathon runners. aug: au: Vernillo, Gianluca Doucende, Gregory Cassirame, Johan Mourot, Laurent affil: Department of Biomedical Sciences for Health, Università degli Studi di Milano, Italy sug: subj: Running Physiology Fatigue Metabolism Energy Metabolism Gait Young Adult Kinematics Middle Age Adult Male Middle Aged: 45-64 years Adult: 19-44 years Male ab: Objectives: At a given running speed, humans naturally endeavor to achieve an optimal stride frequency that minimizes metabolic cost. Research has suggested that runners select this near optimal stride frequency in some process of self-optimization even during fatiguing tasks up to 1-h of high-intensity running. Here, we studied whether runners demonstrate a similar self-optimizing capability after an ultramarathon of 6 h.Design: Controlled pre-post study.Method: We collected temporal stride kinematics and metabolic data in nine (experimental group) male runners before and after 6 h of running and in six (control group) male ultramarathon runners who did not run, but stayed awake and performed normal, daily physical activities avoiding strenuous exercises over the 6-h period. For each participant, preferred and optimal stride frequencies were measured, where stride frequency was systematically varied above and below PSF (±4% and ±8%).Results: Preferred and optimal stride frequencies across time and group showed no significant differences (p ≥ 0.276). Furthermore, neither the overall relationship between metabolic cost and stride frequency, nor the energetically optimal stride frequency changed substantially after several hours of running.Conclusions: Similar dynamics of stride frequency adjustments in the experimental group occurred as those found in a non-fatigued state. This suggests that after an ultramarathon of 6 h, runners were still able to optimize their gait, and automatically adjust it in order to converge on the energetically optimal gait. pubtype: Academic Journal doctype: Journal Article ougenre: Article language: English refInfo: holdings: @attributes: islocal: N |
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