Showing papers in "Journal of Electromyography and Kinesiology in 2010"

TL;DR: If the aim is to reduce inter-individual variability, then the peak or mean EMG from the task under investigation should be used as the normalization reference value, but the ability of such normalization methods to facilitate comparisons of EMGs is questionable.

TL;DR: The problems associated with surface EMG in muscle force estimation are discussed and the solutions that novel methodological developments provide to this problem are discussed.

TL;DR: Support is provided for the clinical hypothesis that FHRSP impacts shoulder mechanics independent of shoulder pain by displaying significantly greater scapular internal rotation with less serratus anterior activity during both tasks.

TL;DR: Evaluating the effectiveness of several maximal voluntary isometric contraction strategies and identifying maximum electromyographic reference values used for normalizing trunk muscle activity concluded that several upper and lower trunk MVC techniques should be performed for EMG normalization in healthy women.

TL;DR: The study highlights the importance of APAs in control of posture and points out the existence of a relationship between the anticipatory and the compensatory components of postural control and suggests a possibility to enhance balance control by improving the APAs responses during external perturbations.

TL;DR: The present results legitimate the use of TMG for the assessment of vastus medialis muscle contractile properties, particularly for Dm and Tc, and it is recommended to avoid Tr quantification and IED modifications during multiple TMG measurements.

TL;DR: Peripheral impairments assessed by sEMG spectral index FI(nsm5) may be a relevant factor involved in the loss of power output after dynamic high-loading fatiguing task.

TL;DR: Investigation of muscle co-activation as a predisposing factor in low back pain development while including a multifactorial approach of clinical assessment tools and psychosocial assessments to identify individuals who are at risk for pain development during standing finds it useful for early identification of at-risk individuals.

TL;DR: The outcome of the study suggests that control of posture could be enhanced by better utilization of APAs and such an approach could be considered as a valuable modality in the rehabilitation of individuals with balance impairment.

TL;DR: Comprehensive fall risk screening and prevention programs should address both neuromuscular and non-muscular factors, and, weakness of the ankle dorsiflexors and plantarflexors should be further studied as potential contributors to falls in older adults.

TL;DR: The most reproducible patterns of activation arose from the more prime mover muscle sites in all EMG variables analysed and although variability was present, there emerged 'invariant characteristics' that were considered 'normal' for this group of non pathological shoulders.

TL;DR: The results showed that postures and the type of mobile phone task affected muscle activity and thumb positions and subjects with symptoms had lower muscle activity levels in the abductor pollicis longus and tended to have higher thumb movement velocities and fewer pauses in the thumb movements compared to those without symptoms.

TL;DR: The data suggests that normalising EMG to dynamic methods is the most appropriate for examining muscle activity during cycling over different days and for once-off measurements.

TL;DR: The finding that hand gripping altered muscle activation, and thus the internal loading, of the shoulder may play an important role in shoulder injury development and rehabilitation is found.

TL;DR: It is demonstrated that persons with knee OA develop higher antagonistic muscle activity despite differences in freely chosen walking speed, and although subjects with OA had higher co-contraction than the control group, co- Contraction may not increase with disease severity.

TL;DR: The observed increased trunk muscle activity in subjects with CLBP during walking supports the guarding hypothesis.

TL;DR: Kinetics and kinematics changes observed at hip and knee joint was expected due to their function as power sources and would be explained as an attempt to overcome decreased contractile properties of muscles during fatigue.

TL;DR: It is demonstrated that lengthening of intracellular action potential (IAP) profile typical for fatiguing contraction could affect EMG amplitude characteristics stronger than alteration in neural drive defined by number of active motor units (MUs) and their firing rates.

TL;DR: The exercise program proved beneficial in reducing LBP during standing and changes in muscle activation patterns previously associated with LBP were shown to change positively with appropriate exercise intervention.

TL;DR: It is concluded that high-frequency/high peak-to-peak displacement was the most effective vibration setting to enhance knee extensor muscle strength and jump performance during a 6-week WBV training program and that these improvements were not mediated by central neural adaptations.

TL;DR: The learning of complete selectiveactivation of both the lower and the upper serratus anterior of one subject, and selective activation of either the upper or lower serratu anterior by five subjects designates the promising clinical application of EMG biofeedback for restoring scapular muscle balance.

TL;DR: The data suggest that the ST and BF architecture is not uniform and that measurement of these parameters largely depends on the measurement site, and modeling these muscles by assuming a uniform architecture along muscle length may yield less accurate representation of human hamstring muscle function.

TL;DR: The global pattern of muscle recruitment was consistent between s EMG and fEMG but sEMG recordings were characterized by additional myoelectric content, and these findings support and guide the use of f EMG techniques to investigate leg muscle recruitment during cycling.

TL;DR: It was concluded that the squat jump provides a standardised and reproducible reference EMG value for the triceps surae for use as a normalisation method.

TL;DR: The findings suggest that inter-segmental spine motion is complex, task dependent, and often unevenly distributed between spine levels, with motion patterns differing between subjects, even in the absence of pathology.

TL;DR: An experimental application of the algorithm was carried out recruiting a population of 10 able-bodied subjects and processing the myoelectric signals recorded from the lower limb during an isokinetic exercise, and it was able to reveal correctly the timing of muscular activation with performance comparable to the state-of-the-art methods.

TL;DR: Adaptations in below-knee amputees in response to increasing steady-state walking speeds were consistent with the need for additional body support and forward propulsion in the absence of the plantar flexors.

TL;DR: It is suggested that young adults with chronic neck pain exhibit proprioceptive dysfunction and altered EMG pattern during voluntary sagittal neck motions and guidelines are provided which could lead to the development of therapeutic exercise programs.

TL;DR: This study provides characterization of daily living and mobility activities associated with manual wheelchair propulsion not previously reported and identifies activities that result in higher shoulder kinetics when compared to standard level propulsion.

TL;DR: Until the relationships between wire and surface electrode measurements are better defined in other postures, intensities and exertion types, the use of surface electrodes to estimate indwelling rotator cuff activity is cautioned against.