Electronic textiles are an emerging field providing novel and non-intrusive solutions for healthcare. Conducting polymer-coated enable a new generation of fully organic surface electrodes electrophysiological evaluations. Textile able to assess high quality muscular monitoring perform transcutaneous electrical stimulation. As service our authors readers, this journal provides supporting information supplied by the authors. Such materials peer reviewed may be re-organized online delivery, but...

Abstract The purpose of the study was to examine time course neuromuscular fatigue components during a low‐frequency electrostimulation (ES) session. Three bouts 17 trains stimulation at 30 H Z (4 s on, 6 off) were used electrically induce in plantar flexor muscles. Before and after every 17‐train bout, torque, electromyographic activity [expressed as root mean square (RMS) median frequency (MF) values], evoked potentials (M‐wave H‐reflex), level voluntary activation (LOA, using twitch...

The aim of the study was to compare fatigue induced by different electrical stimulation (ES) protocols. triceps surae muscle 8 healthy subjects fatigued with 4 protocols (30 Hz-500 μs, 30 Hz-1 ms, 100 and μs), composed 60 trains (4 s on-6 off), delivered at an intensity evoking 30% maximal voluntary contraction (MVC). Fatigue quantified ES MVC torque decreases. amplitude twitch pulse width used in each fatiguing protocol (twitch Istim ) analyzed. All parameters decreased significantly after...

Neuromuscular electrical stimulation (NMES) causes early onset of neuromuscular fatigue. Peripheral electrophysiological explorations suggest that supra-spinal alterations are involved through sensitive afferent pathways. As sensory input is projected over the primary somatosensory cortex (S1), S1 area involvement in inhibiting central motor drive can be hypothesized. This study assessed cortical activity under a fatiguing NMES protocol at low frequency.Twenty healthy males performed five...

The aim of the study was to identify stimulation conditions permitting occurrence extra torque (ET) and examine their impact on spinal corticospinal excitabilities. Twelve subjects received trains over tibial nerve (20 s duration, 1 ms pulse duration) that were delivered at 3 frequencies (20, 50, 100 Hz) 5 intensities (110%, 120%, 130%, 140%, 150% motor threshold). Torque-time integral (TTI) each train calculated. Spinal [maximum H-reflex (Hmax)/maximal M-wave (Mmax)] [maximal evoked...

This study aimed to evaluate torque production in response the application of a brief muscle lengthening during neuromuscular electrical stimulation (NMES) applied over posterior tibial nerve. Fifteen participants took part three experimental sessions, where wide-pulse NMES delivered at 20 and 100 Hz (pulse duration 1 ms 15 s an intensity evoking 5-10% maximal voluntary contraction) was either alone (NMES condition) or combination with distinct speeds (60, 180, 300°/s; + LEN condition). The...

We examined the neural mechanisms responsible for plantar flexion torque changes at different joint positions.Nine subjects performed maximal voluntary contractions (MVC) 6 ankle-knee angle combinations [3 ankle angles (dorsiflexion, anatomic position, flexion) and 2 knee (flexion, full extension)]. Neural were determined by V-wave, H-reflex (at rest during MVC), electromyography MVC (RMS), normalized to muscle compound action potential (V/Msup, Hmax/Mmax, Hsup Msup RMS/Msup) activation...

This study compared fatigue development of the triceps surae induced by two electrical stimulation protocols composed constant and variable frequency trains (CFTs, VFTs, 450 trains, 30 Hz, 167 ms ON, 500 OFF 146 respectively). For VFTs protocol a doublet (100 Hz) was used at beginning each train. The intensity evoked 30% maximal voluntary contraction (MVC) defined using CFTs. Neuromuscular tests were performed before after protocol. Changes in excitation-contraction coupling assessed...

The purpose of the study was to assess neural adaptations plantar-flexors induced by an electrical stimulation training applied over motor nerve at low intensity using two different frequencies. Thirty subjects were randomly assigned into 3 groups: 20 Hz, 100 and control group. consisted 15 sessions 25 trains tibial delivered evoking 10% maximal voluntary isometric contraction (MVIC). Before after training, MVIC assessed evaluated activation level (VAL) V-wave (normalized superimposed muscle...

Muscle fatigue is an unavoidable problem when electrical stimulation applied to paralyzed muscles. The detection and compensation of muscle essential avoid movement failure achieve desired trajectory. This work aims predict ankle plantar-flexion torque using stimulus evoked EMG (eEMG) during different states. Five spinal cord injured patients were recruited for this study. An intermittent protocol was delivered triceps surae induce fatigue. A hammerstein model used capture the contraction...

The study analyzed neural mechanisms mediating spinal excitability modulation during eccentric (ECC) movement (passive muscle lengthening, submaximal, and maximal ECC contractions) as compared with concentric (CON) conditions. Twenty-two healthy subjects participated in three experiments. Experiment A (n = 13) examined D1 presynaptic inhibition (D1 PI) recurrent (RI) passive lengthening shortening, by conditioning the soleus (SOL) H-reflex common peroneal nerve submaximal tibial stimulation,...

Using different electrophysiological techniques, results show that the downregulation of spinal excitability observed after 20-Hz train could be ascribed to homosynaptic postactivation depression Ia afferents terminals, whereas changes in intrinsic motoneuron properties explain increased 100-Hz train. A novel methodology for assessing soleus D1 presynaptic inhibition and heteronymous facilitation, accounting eventual modulations test reflex amplitude throughout session, was developed.

This study investigated the influence of stimulation parameters on torque production when combining a brief muscle lengthening with electrical stimulation. Fifteen volunteers participated in one experimental session where two distinct modalities were compared: wide-pulse high-frequency (WPHF; pulse duration: 1 ms, frequency: 100 Hz), favoring afferent pathway activation, and narrow-pulse low-frequency (NPLF; 0.05 20 activation efferent pathway. Both applied to evoke 5-10% maximal voluntary...

This study investigated torque production resulting from the combined application wide‐pulse neuromuscular electrical stimulation (NMES), delivered over posterior tibial nerve, and muscle lengthening at two distinct amplitudes. Wide‐pulse NMES (pulse duration: 1ms; intensity: 5 – 10% of maximal voluntary contraction) was both low (20 Hz) high (100 frequencies, either alone (NMES condition) or with a amplitudes (10 20° ankle joint rotation; NMES+LEN 10 20 conditions, respectively). For each...

Electronic textiles is an emerging field providing novel and non-intrusive solutions for healthcare. On page 2001, Esma Ismailova co-workers evaluate the potential of conducting polymercoated in monitoring stimulating muscle activity. Such textile electrodes are able to assess high quality muscular perform transcutaneous electrical stimulations.

The purpose of this study was to propose a method that allows extraction the current muscle state under electrically induced fatigue.The triceps surae 5 subjects paralyzed by spinal cord injury fatigued intermittent electrical stimulation (5 × trains at 30 Hz). Classical fatigue indices representing contractile properties [peak twitch (Pt) and half-relaxation time (HRT)] were assessed before after each 5-train series used identify 2 relevant parameters (Fm , Ur ) previously developed...