NDLI: Prediction of endurance capacity of quadriceps muscles in humans using surface electromyogram spectrum analysis during submaximal voluntary isometric contractions

Content Provider	Springer Nature Link
Author	Maïsetti, Olivier Guével, Arnaud Legros, Patrick Hogrel, Jean Yves
Copyright Year	2002
Abstract	The measurement of endurance time (t lim) is the procedure commonly used to quantify the ability of a muscle to maintain force. The relationship between surface electromyographic (sEMG) manifestations of localised muscle fatigue and t lim during an effort at 50% of maximal voluntary isometric torque of the knee extensors (vastus lateralis and vastus medialis) until exhaustion was studied in 14 healthy volunteers. It was carried out to test whether changes in sEMG computed over shorter periods than expected t lim could be used to predict t lim. Changes in mean muscle fibre conduction velocity, mean power frequency , median frequency , root mean square ), in the relative power in the 6–30 Hz and 30–60 Hz frequency bands were monitored using linear slope and area ratio index as statistical indicators. These indicators were computed over fixed periods shorter than t lim. The subjects were able to maintain the required force level for [mean (SD)] 78.8 (9.5) s. During the fatigue trial, it was the greatest of the increases in the 6–30 Hz frequency band, recorded for either of the two muscles investigated, that was the only variable which correlated with t lim. Significant relationships between t lim and changes in this low frequency band were observed as early as the first 15–30 s of the contraction. These results suggest that sEMG frequency banding may predict mechanical endurance without the need to maintain the contraction until exhaustion. From a clinical perspective, this could be an advantage for patients who might not be able to tolerate contractions to exhaustion.
Starting Page	509
Ending Page	519
Page Count	11
File Format	PDF
ISSN	14396319
Journal	European Journal of Applied Physiology
Volume Number	87
Issue Number	6
e-ISSN	14396327
Language	English
Publisher	Springer-Verlag
Publisher Date	2002-06-20
Publisher Place	Berlin/Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Content Type	Text
Resource Type	Article
Subject	Orthopedics and Sports Medicine Physiology (medical) Public Health, Environmental and Occupational Health Sports Science

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