Immediate voluntary activation deficits following submaximal eccentric contractions of knee extensors are associated with alterations of the sense of movement.

TitreImmediate voluntary activation deficits following submaximal eccentric contractions of knee extensors are associated with alterations of the sense of movement.
Publication TypeJournal Article
Year of Publication2022
AuthorsDa Silva F, Colson SS, Zghal F, Chorin F, GuÉrin O, Monjo F
JournalSci Rep
Volume12
Issue1
Pagination2338
Date Published2022 02 11
ISSN2045-2322
Mots-clésAdult, Female, Humans, Knee, Knee Joint, Male, Muscle Contraction, Muscle Fatigue, Proprioception, Psychophysiology, Sensory Thresholds, Young Adult
Résumé

The mechanisms underlying movement sense alterations following repeated eccentric contractions remain unclear. This study concomitantly investigated the effects of unilateral eccentric contractions on movement sense and on neuromuscular function at the knee before, immediately after (POST), 24 (POST24) and 48 (POST48) h after the exercise. Twelve participants performed sets of submaximal knee extensors (KE) eccentric contractions until a 20% decrease in maximal voluntary isometric contraction (MVIC) torque was reached. Threshold to detect passive movement (TTDPM) tasks were used to assess movement sense during both knee flexion (TTDPM) and extension (TTDPM). KE fatigability was assessed using the interpolated twitch technique. TTDPM values expressed in seconds and the percentage of unsuccessful trials only increased at POST during TTDPM and TTDPM. The 20%-MVIC decrease was associated with significant decreases in voluntary activation level (- 12.7%, p < 0.01) and potentiated doublet torque at 100 Hz (- 18.1%, p < 0.001). At POST24, despite persistent reductions of maximal voluntary and electrically evoked torques associated with increased perceived muscle soreness, TTDPM values and the percentage of unsuccessful trials returned to baseline values. Consequently, movement sense alterations were only observed in the presence of voluntary activation deficits, suggesting that some exercise-induced central alterations may affect the somatosensory function.

DOI10.1038/s41598-022-06081-2
Alternate JournalSci Rep
PubMed ID35149737
PubMed Central IDPMC8837602