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Electromechanical delay components during relaxation after voluntary contraction: reliability and effects of fatigue.

AbstractINTRODUCTION:
Fatigue effects on total relaxation delay (R-DelayTOT ) components and measurement reliability were investigated.
METHODS:
Electromyogram (EMG), force (F), and mechanomyogram (MMG) were recorded during maximum voluntary contraction from the biceps brachii muscle before and after fatigue. The delays between EMG cessation and onset of F decay (R-EMD), between F decay and onset of MMG largest displacement (MMG p-p) (R-Δt F-MMG), from the beginning to the end of MMG p-p (R-Δt MMGp-p ), and from the end of MMG p-p to F cessation (R-Δt MMG-Fend ) were calculated.
RESULTS:
R-DelayTOT lasted 366 ± 10 ms. R-EMD, R-Δt F-MMG, R-Δt MMGp-p , and R-Δt MMG-Fend accounted for 6%, 8%, 59%, and 27% of R-DelayTOT , respectively. After fatigue, R-DelayTOT , R-EMD, R-Δt F-MMG, and R-Δt MMGp-p increased by 38%, 22%, 40%, 40%, and 38%, respectively (P<0.05). Reliability was very high (0.853-0.960).
CONCLUSIONS:
R-Δt MMGp-p was the main contributor to R-DelayTOT . Fatigue affected all R-DelayTOT contributors, with a smaller effect on R-EMD.
AuthorsEmiliano Cè, Susanna Rampichini, Massimo Venturelli, Eloisa Limonta, Arsenio Veicsteinas, Fabio Esposito
JournalMuscle & nerve (Muscle Nerve) Vol. 51 Issue 6 Pg. 907-15 (Jun 2015) ISSN: 1097-4598 [Electronic] United States
PMID25256098 (Publication Type: Journal Article, Research Support, Non-U.S. Gov't)
Copyright© 2014 Wiley Periodicals, Inc.
Topics
  • Adult
  • Arm (physiology)
  • Electromyography
  • Ergometry
  • Fatigue (physiopathology)
  • Humans
  • Isometric Contraction (physiology)
  • Muscle, Skeletal (physiology)
  • Myography
  • Reproducibility of Results
  • Sensitivity and Specificity
  • Statistics as Topic
  • Young Adult

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