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Scand J Med Sci Sports. 2016 Nov;26(11):1321-1333. doi: 10.1111/sms.12583. Epub 2015 Nov 19.

Acute and delayed peripheral and central neuromuscular alterations induced by a short and intense downhill trail run.

Author information

1
Laboratory of Exercise Physiology (EA4338), University Savoie Mont-Blanc, Le Bourget-du-Lac, France. marlene.giandolini@salomon.com.
2
Amer Sports Footwear Laboratory of Biomechanics and Exercise Physiology, Salomon SAS, Annecy, France. marlene.giandolini@salomon.com.
3
Amer Sports Footwear Laboratory of Biomechanics and Exercise Physiology, Salomon SAS, Annecy, France.
4
Laboratory of Exercise Physiology (EA4338), University Savoie Mont-Blanc, Le Bourget-du-Lac, France.
5
Human Performance Laboratory, Faculty of Kinesiology, University of Calgary, Calgary, Alberta, Canada.
6
Laboratory of Human Motricity, Education Sport and Health, University of Nice Sophia Antipolis, Nice, France.

Abstract

Downhill sections are highly strenuous likely contributing to the development of neuromuscular fatigue in trail running. Our purpose was to investigate the consequences of an intense downhill trail run (DTR) on peripheral and central neuromuscular fatigue at knee extensors (KE) and plantar flexors (PF). Twenty-three runners performed a 6.5-km DTR (1264-m altitude drop) as fast as possible. The electromyographic activity of vastus lateralis (VL) and gastrocnemius lateralis (GL) was continuously recorded. Neuromuscular functions were assessed Pre-, Post-, and 2-day Post-DTR (Post2d). Maximal voluntary torques decreased Post (∼ -19% for KE, ∼ -25% for PF) and Post2d (∼ -9% for KE, ∼ -10% for PF). Both central and peripheral dysfunctions were observed. Decreased KE and PF voluntary activation (VA), evoked forces, VL M-wave amplitude, and KE low-frequency fatigue were observed at Post. Changes in VL M-wave amplitude were negatively correlated to VL activity during DTR. Changes in PF twitch force and VA were negatively correlated to GL activity during DTR. The acute KE VA deficit was about a third of that reported after ultramarathons, although peripheral alterations were similar. The prolonged force loss seems to be mainly associated to VA deficit likely induced by the delayed inflammatory response to DTR-induced ultrastructural muscle damage.

KEYWORDS:

Downhill running; central fatigue; muscle activity; peripheral fatigue; trail running

PMID:
26584478
DOI:
10.1111/sms.12583
[Indexed for MEDLINE]

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