Abstract
Introduction: 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 (Pp-p was the main contributor to R-DelayTOT. Fatigue affected all R-DelayTOT contributors, with a smaller effect on R-EMD.
| Original language | English |
|---|---|
| Pages (from-to) | 907-915 |
| Number of pages | 9 |
| Journal | Muscle and Nerve |
| Volume | 51 |
| Issue number | 6 |
| DOIs | |
| Publication status | Published - Jun 1 2015 |
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Keywords
- Electromyogram
- Force
- Latency
- Mechanomyogram
- Myotonia
ASJC Scopus subject areas
- Clinical Neurology
- Cellular and Molecular Neuroscience
- Physiology (medical)
- Physiology
- Medicine(all)
Cite this
Electromechanical delay components during relaxation after voluntary contraction : Reliability and effects of fatigue. / Cè, Emiliano; Rampichini, Susanna; Venturelli, Massimo; Limonta, Eloisa; Veicsteinas, Arsenio; Esposito, Fabio.
In: Muscle and Nerve, Vol. 51, No. 6, 01.06.2015, p. 907-915.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Electromechanical delay components during relaxation after voluntary contraction
T2 - Reliability and effects of fatigue
AU - Cè, Emiliano
AU - Rampichini, Susanna
AU - Venturelli, Massimo
AU - Limonta, Eloisa
AU - Veicsteinas, Arsenio
AU - Esposito, Fabio
PY - 2015/6/1
Y1 - 2015/6/1
N2 - Introduction: 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 (Pp-p was the main contributor to R-DelayTOT. Fatigue affected all R-DelayTOT contributors, with a smaller effect on R-EMD.
AB - Introduction: 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 (Pp-p was the main contributor to R-DelayTOT. Fatigue affected all R-DelayTOT contributors, with a smaller effect on R-EMD.
KW - Electromyogram
KW - Force
KW - Latency
KW - Mechanomyogram
KW - Myotonia
UR - http://www.scopus.com/inward/record.url?scp=84929516971&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=84929516971&partnerID=8YFLogxK
U2 - 10.1002/mus.24466
DO - 10.1002/mus.24466
M3 - Article
C2 - 25256098
AN - SCOPUS:84929516971
VL - 51
SP - 907
EP - 915
JO - Muscle and Nerve
JF - Muscle and Nerve
SN - 0148-639X
IS - 6
ER -