Distribution of motor unit potential velocities in the biceps brachii muscle of sprinters and endurance athletes during short static contractions at low force levels

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

“…The CV calculated by the IPL method correlated very well with that calculated by the CC method (Table 1), which was consistent with our earlier experiment under static conditions (Klaver-Król et al, 2010). Both in the dynamic and the static experiments, the CV obtained by the CC method was systematically higher than that by the IPL method.…”

“…Our previous study found that during short ($4 s) static contractions at low (up to 20% MVC) force levels, sprinters produced relatively more fast propagating MUPs than endurance athletes, as indicated by the skewness parameter (Klaver-Król et al, 2010). In the present study, a larger proportion of fast propagating MUPs was again found in sprinters, this time during prolonged dynamic exercises at low forces of the same range.…”

Fibromyalgia: Increased reactivity of the muscle membrane and a role of central regulation

“…In the set-up of the sEMG measurements, we tried to mimic natural everyday activities: while applying static conditions, the force was exerted by an inertial load put in the palm of the hand. The methods have been described in detail previously (Klaver-Krol et al, 2007;Klaver-Krol et al, 2010). Maximum voluntary contraction force (MVC = maximum strength) of the elbow flexors was measured with a hand-held dynamometer (Lameris Instruments, Utrecht, The Netherlands).…”

“…To achieve the above goals, we measured the CV by surface electromyography (sEMG) using an elaborated method previously developed to distinguish between the muscles of sprinters and of long-distance runners (Klaver-Krol et al, 2010). From the sEMG signals, large sets of motor unit action potentials' velocities (MUPs, CV-MUPs) were obtained.…”

Surface Electromyography Assessment of the <i>Biceps Brachii</i> Muscle between the Endplate Region and Distal Tendon Insertion: Comparison in Terms of Gender, Dominant Arm and Contraction

“…Researchers have reported that electromyography (EMG) characteristics are influenced by electrode placement on the biceps brachii muscle 8,9) . In many studies, they chose the middle of the BB muscle for electromyographic analysis [10][11][12][13][14] , and only a few previous studies have investigated surface electromyography of the BB muscle in the lower part of the muscle belly [15][16][17] . Lowery et al investigated cross-talk in this muscle zone 18) and Merletti et al investigated the detection of sEMG in the innervation zone of BB 19) .…”