Task failure during sustained low‐intensity contraction is not associated with a critical amount of central fatigue

Fatigue‐related mechanisms induced by low‐intensity prolonged contraction in lower limb muscles are currently unknown. This study investigated central fatigue kinetics in the knee extensors during a low‐intensity sustained isometric contraction. Eleven subjects sustained a 10% maximal voluntary cont...

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Published in:Scandinavian journal of medicine & science in sports 2020-12, Vol.30 (12), p.2329-2341
Main Authors: Souron, Robin, Voirin, Anne‐Cloé, Kennouche, Djahid, Espeit, Loïc, Millet, Guillaume Y, Rupp, Thomas, Lapole, Thomas
Format: Article
Language:English
Subjects:
central fatigue
Electric Stimulation - methods
Electromyography
Evoked Potentials, Motor
Femoral Nerve - physiology
Humans
Isometric Contraction
Knee - physiology
Life Sciences
Male
Muscle Fatigue - physiology
Perception - physiology
Physical Exertion - physiology
Pyramidal Tracts - physiology
RPE
sustained contraction
task failure
Task Performance and Analysis
Transcranial Magnetic Stimulation
voluntary activation
Young Adult
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Summary:Fatigue‐related mechanisms induced by low‐intensity prolonged contraction in lower limb muscles are currently unknown. This study investigated central fatigue kinetics in the knee extensors during a low‐intensity sustained isometric contraction. Eleven subjects sustained a 10% maximal voluntary contraction (MVC) until task failure (TF) with neuromuscular evaluation every 3 minutes. Testing encompassed transcranial magnetic stimulation to evaluate maximal voluntary activation (VATMS), motor evoked potential (MEP), and silent period (SP), and peripheral nerve stimulation to assess M‐wave. Rating of perceived exertion (RPE) was also recorded. MVC progressively decreased up to 50% of the time to TF (ie, 50%TTF) and then plateaued, reaching ~50% at TF (P 
ISSN:0905-7188
1600-0838
DOI:10.1111/sms.13815