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Fatigue and Recovery after Single-Stage versus Multistage Ultramarathon Running.

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Title: Fatigue and Recovery after Single-Stage versus Multistage Ultramarathon Running.
Authors: BESSON, THIBAULT1, ROSSI, JÉRÉMY1, LE ROUX MALLOUF, THIBAULT2, MARECHAL, MATTHIEU2, DOUTRELEAU, STÉPHANE2, VERGES, SAMUEL2, MILLET, GUILLAUME Y.1
Source: Medicine & Science in Sports & Exercise. Aug2020, Vol. 52 Issue 8, p1691-1698. 8p.
Subject Terms: *Fatigue (Physiology), Knee physiology, Neuromuscular disease diagnosis, Peripheral nervous system physiology, Femur physiology, Tibia physiology, Evoked potentials (Electrophysiology), Neural stimulation, Vagus nerve, Extreme sports, Cooldown, Long-distance running, Flexor hallucis longus
Abstract: Purpose: Ultramarathon running includes two main types of events: single-stage race (SSR) and multistage races (MSR). Direct comparison of neuromuscular fatigue and recovery after SSR versus MSR race of comparable distance and elevation has never been performed. The aim of this study was to assess neuromuscular fatigue and recovery after two ultramarathons of equal distance performed either (i) in a single stage or (ii) in four successive days. Methods: Thirty-one runners participated in the study: 17 ran 169 km in a single-stage race and 14 performed around 40 km·d−1 over 4 d. The two races were performed on the same course. Neuromuscular function was tested before (PRE), after (POST), and 2 (D + 2), 5 (D + 5) and 10 (D + 10) days after the races. Neuromuscular function was evaluated on both knee extensors (KE) and plantar flexors (PF) with voluntary and evoked contractions using electrical (femoral and tibial, respectively) nerve stimulation. Results: Reduction of voluntary activation measured in the KE was greater (i.e., central fatigue) for SSR than MSR directly after the race (−23% vs −7%), P < 0.01). Reductions in evoked mechanical KE and PF responses on relaxed muscle (i.e., peripheral fatigue) of both KE and PF took longer to recover in MSR than in SSR. Conclusions: Performing prolonged running exercise over several days, each separated by rest, elicits more prolonged impairments in contractile function compared with single-stage ultramarathon, whereas single-stage mountain ultramarathon ran on the same course is associated with greater central fatigue. [ABSTRACT FROM AUTHOR]
Copyright of Medicine & Science in Sports & Exercise is the property of Lippincott Williams & Wilkins and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
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  Data: Fatigue and Recovery after Single-Stage versus Multistage Ultramarathon Running.
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– Name: Abstract
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  Data: Purpose: Ultramarathon running includes two main types of events: single-stage race (SSR) and multistage races (MSR). Direct comparison of neuromuscular fatigue and recovery after SSR versus MSR race of comparable distance and elevation has never been performed. The aim of this study was to assess neuromuscular fatigue and recovery after two ultramarathons of equal distance performed either (i) in a single stage or (ii) in four successive days. Methods: Thirty-one runners participated in the study: 17 ran 169 km in a single-stage race and 14 performed around 40 km&#183;d−1 over 4 d. The two races were performed on the same course. Neuromuscular function was tested before (PRE), after (POST), and 2 (D + 2), 5 (D + 5) and 10 (D + 10) days after the races. Neuromuscular function was evaluated on both knee extensors (KE) and plantar flexors (PF) with voluntary and evoked contractions using electrical (femoral and tibial, respectively) nerve stimulation. Results: Reduction of voluntary activation measured in the KE was greater (i.e., central fatigue) for SSR than MSR directly after the race (−23% vs −7%), P &lt; 0.01). Reductions in evoked mechanical KE and PF responses on relaxed muscle (i.e., peripheral fatigue) of both KE and PF took longer to recover in MSR than in SSR. Conclusions: Performing prolonged running exercise over several days, each separated by rest, elicits more prolonged impairments in contractile function compared with single-stage ultramarathon, whereas single-stage mountain ultramarathon ran on the same course is associated with greater central fatigue. [ABSTRACT FROM AUTHOR]
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  Data: &lt;i&gt;Copyright of Medicine &amp; Science in Sports &amp; Exercise is the property of Lippincott Williams &amp; Wilkins and its content may not be copied or emailed to multiple sites without the copyright holder&#39;s express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.&lt;/i&gt; (Copyright applies to all Abstracts.)
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RecordInfo BibRecord:
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    Identifiers:
      – Type: doi
        Value: 10.1249/MSS.0000000000002303
    Languages:
      – Code: eng
        Text: English
    PhysicalDescription:
      Pagination:
        PageCount: 8
        StartPage: 1691
    Subjects:
      – SubjectFull: Fatigue (Physiology)
        Type: general
      – SubjectFull: Knee physiology
        Type: general
      – SubjectFull: Neuromuscular disease diagnosis
        Type: general
      – SubjectFull: Peripheral nervous system physiology
        Type: general
      – SubjectFull: Femur physiology
        Type: general
      – SubjectFull: Tibia physiology
        Type: general
      – SubjectFull: Evoked potentials (Electrophysiology)
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      – SubjectFull: Neural stimulation
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      – SubjectFull: Vagus nerve
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      – SubjectFull: Extreme sports
        Type: general
      – SubjectFull: Cooldown
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      – SubjectFull: Long-distance running
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      – SubjectFull: Flexor hallucis longus
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      – TitleFull: Fatigue and Recovery after Single-Stage versus Multistage Ultramarathon Running.
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              Text: Aug2020
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              Y: 2020
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