Distribution of motor unit potential velocities in the biceps brachii muscle of sprinters and endurance athletes during prolonged dynamic exercises at low force levels

Reliability of resting intramuscular fiber conduction velocity evaluation

“…Resting MFCV was higher than previous reports in healthy or trained participants . However, those previous studies investigated MFCV in biceps brachii or used sEMG.…”

Muscle fiber velocity and electromyographic signs of fatigue in fibromyalgia

“…On the Methods. As some methodological pitfalls might lead to falsely high CV estimates, we took appropriate measures: (a) we selected participants with thin skin, and an additional analysis of subgroups matched on skin thickness confirmed the CV results 18 ; (b) the electrodes were placed far from the innervation zone 23,41,42 ; (c) possible misalignments between electrodes and muscle fibers were checked by measuring the CV (the lowest CV indicates the optimal electrode location) 22 ; and (d) the skin temperature in the vicinity of the electrodes was measured and was similar between patients and controls. 43 During fatigue, we did not differentiate between the peripheral and central fractions of fatigue by, for example, using the interpolated twitch technique, which can be regarded as a methodological limitation.…”

Neuromuscular functions in sportsmen and fibromyalgia patients : a surface EMG study in static and dynamic conditions

“…During both static and dynamic tests, the mean CV of the muscles in sprinters was higher than that of the muscles in endurance athletes. Interestingly, our newly introduced variable, the skewness of peak-CVs, appeared even more sensitive than the mean CV in showing the differences between the two types of sportsmen: sprinters had a significantly greater proportion of fast propagating peaks than endurance athletes (Klaver-Król et al 2010a, Klaver-Król et al 2010b. This underscores the value of skewness as an additional sEMG variable.…”

“…As some methodological pitfalls might lead to falsely high CV estimates, we took appropriate measures: (a) we selected participants with thin skin, and an additional analysis of sub-groups matched on skin thickness confirmed the CV results (Hogrel et al 1998); (b) the electrodes were placed far from the innervation zone (Klaver-Król et al 2010a, Nielsen et al 2008, Rainoldi et al 2000; (c) possible misalignments between electrodes and muscle fibers were checked by measuring the CV, (the lowest CV indicates the optimal electrode location) (Sollie et al 1985b); and (d) the skin temperature in the vicinity of the electrodes was measured and was similar between patients and controls (Blijham et al 2008).…”