S
S. Karlsson
Researcher at Umeå University
Publications - 41
Citations - 1132
S. Karlsson is an academic researcher from Umeå University. The author has contributed to research in topics: Computer science & Vastus lateralis muscle. The author has an hindex of 15, co-authored 24 publications receiving 1052 citations.
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Journal ArticleDOI
Mean frequency and signal amplitude of the surface EMG of the quadriceps muscles increase with increasing torque - A study using the continuous wavelet transform
S. Karlsson,Björn Gerdle +1 more
TL;DR: Time frequency methods can be applied when investigating EMG during brief contractions associated with non-stationarity, and in a great majority of the subjects and in the three muscles, significant linear force dependencies were found for STMNF.
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Criterion validation of surface EMG variables as fatigue indicators using peak torque: a study of repetitive maximum isokinetic knee extensions.
TL;DR: At the individual level MNF generally - in contrast to RMS - showed good criterion validity with respect to biomechanical fatigue during dynamic maximum contractions.
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The influences of muscle fibre proportions and areas upon EMG during maximal dynamic knee extensions.
TL;DR: The results of the present study showed that the three EMG variables of a dynamic endurance test were clearly correlated with the proportions of the different fibre types, but only to a small extent with fibre areas, contradict some of the theoretical models of the EMG.
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Differential responses in intramuscular pressure and EMG fatigue indicators during low‐ vs. high‐level isometric contractions to fatigue
TL;DR: This study investigated changes in intramuscular pressure (IMP) and surface electromyographic (EMG) parameters during contractions to fatigue at 25 and 70% of maximal voluntary contraction (MVC) to suggest a common mechanism governing changes in IMP and EMG fatigue indicators.
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The relationships between EMG and muscle morphology throughout sustained static knee extension at two submaximal force levels
TL;DR: Relationships between surface EMG and muscle morphology, which is contrary to presented models of the EMG, are indicated.