Showing papers in "Journal of Electromyography and Kinesiology in 2000"
••
TL;DR: A common body of knowledge has been created on SEMG sensors and sensor placement properties as well as practical guidelines for the proper use of SEMG.
5,044 citations
••
TL;DR: A time-frequency analysis of the intensities in time series was developed, which uses a filter bank of non-linearly scaled wavelets with specified time-resolution to extract time- Frequency aspects of the signal.
340 citations
••
TL;DR: The purpose of this paper is to briefly review the most frequently used algorithms for EMG variable estimation, compare them using computer generated as well as real signals and outline the advantages and drawbacks of each.
340 citations
••
TL;DR: Elderly people elevate muscle pre- and coactivity during downward stepping to stiffen the leg in compensation for impaired neuromotor functions.
257 citations
••
TL;DR: The paper includes review and discussion of electrode site location, methods of normalization, data reliability, and factors that can affect sEMG signals from this region, including noise, physiologic artifact, stress, visual deficiencies, and pain.
218 citations
••
TL;DR: While the reduced coactivation on the paretic side may contribute to poor postural stability and poor locomotor performance, the presence of excessive co activation on the non-pareticside when both limbs were in ground contact may be an adaptation to help maintain postural Stability during gait.
207 citations
••
TL;DR: An attempt is made to integrate the 'question level' and the 'model property level' in a matrix providing direction to the development and application of sEMG models with different characteristics and varying complexity.
205 citations
••
TL;DR: Assessment of geometrical artefacts on sEMG during isometric contractions at different muscle lengths found three out of five subjects found a 1 cm shift for the vastus medialis muscle while no shift was observed for the other two subjects.
191 citations
••
TL;DR: Two methods for occupational SEMG data reduction representing two different approaches to SEMG applications in ergonomics, Exposure Variation Analysis (EVA) and Joint Analysis of EMG Spectrum and Amplitude (JASA), applied on the same SEMG recording from three muscles during urology surgeon work, have been compared.
164 citations
••
TL;DR: Gap frequency, muscular rest, and percentiles were derived for eight fundamental work tasks and normalisation to RVE, rather than MVE, improved sensitivity to differences between tasks, and reduced undesirable variability.
155 citations
••
TL;DR: These data demonstrate distinct neuromuscular fatigue profiles for the different types of muscle contraction, Whereas eccentric activity was largely fatigue resistant, isometric and concentric contractions displayed different neuromUScular fatigue profile.
••
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.
••
TL;DR: The surface EMG signal detected from voluntarily activated muscles can be used as a control signal for functional neuromuscular electrical stimulation and a proper positioning in relation to the stimulation electrodes is required to reduce the stimulus artefact and the non-voluntary contribution.
••
TL;DR: The EMG amplitude analysis revealed significant differences between groups for some muscles (left lumbar and thoracic erector spinae) and the abnormal EMG patterns detected among CLBP patients were not explained by postural asymmetries.
••
TL;DR: Eccentric actions led to possible muscle damage as indicated by elevated serum CK and muscle soreness, and therefore to longer recovery as compared to concentric actions, as well asFatigue response was action type specific as seen in the greater reduction in the force of the exercise type.
••
TL;DR: In the forward fall paradigm studied, age-differences in balance recovery performance do not seem due to slowness in response onset but may relate to differences in muscle activation timing during the stepping movement.
••
TL;DR: The different techniques to measure and analyze surface EMG are summarized with an emphasis on the clinician's point of view, and the use of analysis techniques such as the estimation of muscle fiber conduction velocity has already proven to be of diagnostic value in several myopathy characterized by a disturbed membrane function and in metabolic myopathies with abnormal fatigue profiles.
••
••
TL;DR: It was concluded that there may be a greater use of fast twitch motor units in explosive movements and that instead of fatigue, the present number of concentric actions in explosive exercise seems to have facilitated the neuromuscular system.
••
TL;DR: The notion that the EMG signal is "quasi-random" in nature, as demonstrated by the reproducible F(med) means and unreliable variability, is supported.
••
TL;DR: The relationship between knee extension force and EMG signals detected by multiple bipolar wire electrodes inserted into the human vastus lateralis muscle under isometric conditions suggests that, if all of the muscle fibers participate in the same action at the same time, the averaged normalized IEMG from any places using wire electrodes could reflect the total activities of that muscle even if the muscle is large.
••
TL;DR: The protocol used for assessing fatigue in the back extensor muscles proved to be reliable and is recommended for further use.
••
TL;DR: The findings confirmed that reactive neuromuscular responses following this functional perturbation differ markedly from those previously reported using seated, partial weight-bearing and/or uni-planar models under relaxed conditions.
••
TL;DR: Results of this study suggest that during isokinetic testing, both the VM and BF have significantly greater reciprocal coactivation levels when compared to the VL and MH, respectively.
••
TL;DR: A new technique for determining the most appropriate sites at which to insert intramuscular electrodes for selective recordings of ECRB and ECRL is presented to provide an important objective method that can be used in conjunction with manual muscle testing to provide a means of ensuring accurate intramUScular electromyographic recording from these two muscles.
••
••
TL;DR: Kinematics and several characteristics of the EMG signals of the trunk were statistically independent of the speed of motion and displayed larger fatigue indexes derived from the EMg signals for some of their back muscles than for other subjects.
••
TL;DR: This work presents a spasticity measurement system for on-line quantifying the stretch reflex of paretic limbs by subtracting the baseline torque, reflex torque measured at a selected low stretch velocity of 5 deg/sec, so the influence of gravity torque and inertial in vertical stretching mode can be minimized.
••
TL;DR: It is expected that the refinement of the method used in this study could provide an effective clinical tool to assess EMG waveforms of trunk muscles during dynamic tasks and several reasons that could explain the low sensitivity of these measures to low back status are discussed.
••
TL;DR: The most interesting finding of this work was the discovery of a cyclic trend in the mean frequency of the myoelectric signals studied, which is a potential indicator of the cyclic recruitment of motor units during sustained postural contractions.