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Journal of Electromyography and Kinesiology

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https://www.readbyqxmd.com/read/28941870/temporal-changes-in-motor-variability-during-prolonged-lifting-lowering-and-the-influence-of-work-experience
#1
Alireza Sedighi, Maury A Nussbaum
Existing research indicates that repetitive motions are strongly correlated with the development of work-related musculoskeletal disorders (WMSDs). Resulting from the redundant degrees-of-freedom in the human body, there are variations in motions that occur while performing a repetitive task. These variations are termed motor variability (MV), and may be beneficial for reducing WMSD risks. To better understand the potential role of MV in preventing injury risk, we evaluated the effects of fatigue on MV using data collected during a lab-based prolonged, repetitive lifting/lowering task...
September 15, 2017: Journal of Electromyography and Kinesiology
https://www.readbyqxmd.com/read/28926802/patterns-of-trunk-muscle-activation-during-walking-and-pole-walking-using-statistical-non-parametric-mapping
#2
Luca Zoffoli, Massimiliano Ditroilo, Ario Federici, Francesco Lucertini
This study used surface electromyography (EMG) to investigate the regions and patterns of activity of the external oblique (EO), erector spinae longissimus (ES), multifidus (MU) and rectus abdominis (RA) muscles during walking (W) and pole walking (PW) performed at different speeds and grades. Eighteen healthy adults undertook W and PW on a motorized treadmill at 60% and 100% of their walk-to-run preferred transition speed at 0% and 7% treadmill grade. The Teager-Kaiser energy operator was employed to improve the muscle activity detection and statistical non-parametric mapping based on paired t-tests was used to highlight statistical differences in the EMG patterns corresponding to different trials...
September 9, 2017: Journal of Electromyography and Kinesiology
https://www.readbyqxmd.com/read/28888972/emg-synchrony-to-assess-impaired-corticomotor-control-of-locomotion-after-stroke
#3
Neha Lodha, Yen-Ting Chen, Theresa E McGuirk, Emily J Fox, Steven A Kautz, Evangelos A Christou, David J Clark
Adapting one's gait pattern requires a contribution from cortical motor commands. Evidence suggests that frequency-based analysis of electromyography (EMG) can be used to detect this cortical contribution. Specifically, increased EMG synchrony between synergistic muscles in the Piper frequency band has been linked to heightened corticomotor contribution to EMG. Stroke-related damage to cerebral motor pathways would be expected to diminish EMG Piper synchrony. The objective of this study is therefore to test the hypothesis that EMG Piper synchrony is diminished in the paretic leg relative to nonparetic and control legs, particularly during a long-step task of walking adaptability...
September 1, 2017: Journal of Electromyography and Kinesiology
https://www.readbyqxmd.com/read/28865312/postural-stability-in-subjects-with-temporomandibular-disorders-and-healthy-controls-a-comparative-assessment
#4
Alessandro Nota, Simona Tecco, Shideh Ehsani, Johnny Padulo, Alberto Baldini
PURPOSE OF THE STUDY: The influence of the stomatognathic apparatus on body posture is a continuously discussed topic with contrasting results. The aim of this study is to analyze differences in postural stability between subjects with and without myogenous TMD. METHODS: 25 subjects affected by myogenous TMD according with DC/TMD (6 males, 19 females; mean age 31.75±6.68years) and a healthy control group of 19 subjects (4 Males, 15 Females; mean age 27.26±3.85years) were enrolled in the study...
August 30, 2017: Journal of Electromyography and Kinesiology
https://www.readbyqxmd.com/read/28846897/muscle-synergies-underlying-sit-to-stand-tasks-in-elderly-people-and-their-relationship-with-kinetic-characteristics
#5
Hiroki Hanawa, Keisuke Kubota, Takanori Kokubun, Tatsuya Marumo, Fumihiko Hoshi, Akira Kobayashi, Naohiko Kanemura
BACKGROUND: Physiological evidence suggests that the nervous system controls motion by using a low-dimensional synergy organization for muscle activation. Because the muscle activation produces joint torques, kinetic changes accompanying aging can be related to changes in muscle synergies. OBJECTIVES: We explored the effects of aging on muscle synergies underlying sit-to-stand tasks, and examined their relationships with kinetic characteristics. METHODS: Four younger and three older adults performed the sit-to-stand task at two speeds...
August 24, 2017: Journal of Electromyography and Kinesiology
https://www.readbyqxmd.com/read/28843087/are-there-mode-specific-and-fatigue-related-electromechanical-delay-responses-for-maximal-isokinetic-and-isometric-muscle-actions
#6
Cory M Smith, Terry J Housh, Ethan C Hill, Joshua L Keller, Glen O Johnson, Richard J Schmidt
This study used a combined electromyographic, mechanomyographic, and force approach to identify electromechanical delay (EMD) from the onsets of the electromyographic to force signals (EMDE-F), onsets of the electromyographic to mechanomyogrpahic signals (EMDE-M), and onsets of mechanomyographic to force signals (EMDM-F). The purposes of the current study were to examine: (1) differences in EMDE-M, EMDM-F, and EMDE-F from the vastus lateralis between maximal isokinetic and maximal concentric isometric leg extensions; and (2) the effects of fatigue and recovery on EMDE-M, EMDM-F, and EMDE-F...
August 23, 2017: Journal of Electromyography and Kinesiology
https://www.readbyqxmd.com/read/28841523/normalizing-shoulder-emg-an-optimal-set-of-maximum-isometric-voluntary-contraction-tests-considering-reproducibility
#7
Cédric Schwartz, François Tubez, François-Charles Wang, Jean-Louis Croisier, Olivier Brüls, Vincent Denoël, Bénédicte Forthomme
Normalization of the electromyography (EMG) signal is often performed relatively to maximal voluntary activations (MVA) obtained during maximum isometric voluntary contraction (MVIC). The first aim was to provide an inter-session reproducible protocol to normalize the signal of eight shoulder muscles. The protocol should also lead to a level of activation >90% of MVA for >90% of the volunteers. The second aim was to evaluate the influence of the method used to extract the MVA from the EMG envelope on the normalized EMG signal...
August 18, 2017: Journal of Electromyography and Kinesiology
https://www.readbyqxmd.com/read/28866370/acute-effects-of-direct-inhibitory-pressure-over-the-biceps-brachii-myotendinous-junction-on-skeletal-muscle-activation-and-force-output
#8
Emiliano Cè, Stefano Longo, Emily McCoy, Angela Valentina Bisconti, Davide Tironi, Eloisa Limonta, Susanna Rampichini, Marco Rabuffetti, Fabio Esposito
Force (F) reduction is reported with myotendinous junction (MTJ) manipulation. Autogenic inhibition reflex (AIR) activation is supposed to be the main mechanism. Still, its role remains unclear. The study aimed at assessing the effects of MTJ direct inhibitory pressure (DIP) on neuromuscular activation and F in the elbow flexor (agonist) and extensor (antagonist) muscles. After maximum voluntary contraction (MVC) assessment, thirty-five participants randomly performed submaximal contractions at 20, 40, 60, and 80% MVC...
August 12, 2017: Journal of Electromyography and Kinesiology
https://www.readbyqxmd.com/read/28818412/are-extramedian-symptoms-associated-with-peripheral-causes-in-patient-with-carpal-tunnel-syndrome-electrodiagnostic-and-ultrasonographic-study
#9
Basak Mansiz-Kaplan, Merve Akdeniz-Leblecicier, Ilker Yagci
OBJECTIVE: To evaluate the relationship between extramedian spreading of sensorial symptoms and median and ulnar nerve cross-sectional area (CSA) and to compare the ultrasonographic and electrophysiological findings in patients with carpal tunnel syndrome (CTS) with or without extramedian sensory symptoms. DESIGN: Cross-sectional study. MATERIALS AND METHODS: Patients with CTS were divided into two groups as with or without extramedian symptoms and were assessed clinically, electrophysiologically and ultrasonographically by three blind investigators...
August 10, 2017: Journal of Electromyography and Kinesiology
https://www.readbyqxmd.com/read/28918109/precision-based-guidelines-for-sub-maximal-normalisation-task-selection-for-trunk-extensor-emg
#10
Jennie A Jackson, Svend Erik Mathiassen, Jack P Callaghan, Patrick G Dempsey
AIM: The object of this study was to quantify the contribution of sub-maximal normalisation to the overall variance of exposure parameters describing erector spinae (ES) activity, and to provide guidelines for task selection which minimize methodological variance. METHODS: ES EMG was measured from three locations (T9, L1 and L5 levels) on fifteen men performing a manual materials handling task in the laboratory on three separate days. Four repeats of each of eleven sub-maximal normalisation tasks (eight static, three dynamic) were collected, work data were normalised to each task and repeat, and exposure parameters calculated...
July 20, 2017: Journal of Electromyography and Kinesiology
https://www.readbyqxmd.com/read/28797897/ultrasonographic-quantification-of-architectural-response-in-tibialis-anterior-to-neuromuscular-electrical-stimulation
#11
Emilie Simoneau-Buessinger, Sébastien Leteneur, Alix Bisman, François Gabrielli, Jennifer Jakobi
While muscle contraction in voluntary efforts has been widely investigated, little is known about contraction during neuromuscular electrical stimulation (NMES). The aim of this study was to quantify in vivo muscle architecture of agonist and antagonist muscles at the ankle joint during NMES. Muscle fascicle lengths and pennation angles of the tibialis anterior (TA) and lateral gastrocnemius muscles were assessed via ultrasonography in 8 healthy young males. Measures were obtained during maximal NMES and torque-matched voluntary dorsiflexion contractions...
October 2017: Journal of Electromyography and Kinesiology
https://www.readbyqxmd.com/read/28763682/normal-contractile-algorithm-of-swallowing-related-muscles-revealed-by-needle-emg-and-its-comparison-to-videofluoroscopic-swallowing-study-and-high-resolution-manometry-studies-a-preliminary-study
#12
Donghwi Park, Hyun Haeng Lee, Seok Tae Lee, Yoongul Oh, Jun Chang Lee, Kyoung Won Nam, Ju Seok Ryu
The purpose of this study was to investigate the function and importance of infrahyoid muscles with the suprahyoid muscles during swallowing, and to investigate swallowing sequences using kinematic analysis, high-resolution manometry (HRM) and electromyography (EMG). As a preliminary study, ten healthy subjects were prospectively enrolled. A needle EMG evaluated the onset latency, peak latency and duration of the suprahyoid and infrahyoid muscles. HRM measured the time intervals among the velopharynx, tongue base, and upper esophageal sphincter...
October 2017: Journal of Electromyography and Kinesiology
https://www.readbyqxmd.com/read/28753521/comparing-electro-and-mechano-myographic-muscle-activation-patterns-in-self-paced-pediatric-gait
#13
Katherine Plewa, Ali Samadani, Tom Chau
Electromyography (EMG) is the standard modality for measuring muscle activity. However, the convenience and availability of low-cost accelerometer-based wearables makes mechanomyography (MMG) an increasingly attractive alternative modality for clinical applications. Literature to date has demonstrated a strong association between EMG and MMG temporal alignment in isometric and isokinetic contractions. However, the EMG-MMG relationship has not been studied in gait. In this study, the concurrence of EMG- and MMG-detected contractions in the tibialis anterior, lateral gastrocnemius, vastus lateralis, and biceps femoris muscles were investigated in children during self-paced gait...
October 2017: Journal of Electromyography and Kinesiology
https://www.readbyqxmd.com/read/28735104/effect-of-limb-dominance-and-sex-on-neuromuscular-activation-patterns-in-athletes-under-12-performing-unanticipated-side-cuts
#14
Michael J Del Bel, Alana K Fairfax, Michelle L Jones, Kendal Steele, Scott C Landry
Non-contact ACL injuries are one of the most common injuries to the knee joint among adolescent/collegiate athletes, with sex and limb dominance being identified as risk factors. In children under 12years of age (U12), these injuries occur less often and there is no sex-bias present. This study set out to explore if sex and/or limb dominance differences exist in neuromuscular activations in U12 athletes. Thirty-four U12 males and females had six bilateral muscles analyzed during unanticipated side-cuts. Principal component analysis was performed, capturing differences in overall magnitudes and timing of peak magnitudes...
October 2017: Journal of Electromyography and Kinesiology
https://www.readbyqxmd.com/read/28735103/voluntary-activation-of-the-trapezius-muscle-in-cases-with-neck-shoulder-pain-compared-to-healthy-controls
#15
Katrine Tholstrup Bech, Camilla Marie Larsen, Gisela Sjøgaard, Andreas Holtermann, Janet L Taylor, Karen Søgaard
Subjects reporting neck/shoulder pain have been shown to generate less force during maximal voluntary isometric contractions (MVC) of the shoulder muscles compared to healthy controls. This has been suggested to be caused by a pain-related decrease in voluntary activation (VA) rather than lack of muscle mass. The aim of the present study was to investigate VA of the trapezius muscle during MVCs in subjects with and without neck/shoulder pain by use of the twitch interpolation technique. Ten cases suffering from pain and ten age and gender matched, healthy controls were included in the study...
October 2017: Journal of Electromyography and Kinesiology
https://www.readbyqxmd.com/read/28735102/intra-operatively-measured-spastic-semimembranosus-forces-of-children-with-cerebral-palsy
#16
Can A Yucesoy, Yener Temelli, Filiz Ateş
The knee kept forcibly in a flexed position is typical in cerebral palsy. Using a benchmark, we investigate intra-operatively if peak spastic hamstring force is measured in flexed knee positions. This tests the assumed shift of optimal length due to adaptation of spastic muscle and a decreasing force trend towards extension. Previously we measured spastic gracilis (GRA) and semitendinosus (ST) forces. Presently, we studied spastic semimembranosus (SM) and tested the following hypotheses: spastic SM forces are (1) high in flexed and (2) low in extended positions...
October 2017: Journal of Electromyography and Kinesiology
https://www.readbyqxmd.com/read/28734171/muscle-synergies-reveal-impaired-trunk-muscle-coordination-strategies-in-individuals-with-thoracic-spinal-cord-injury
#17
Matija Milosevic, Hikaru Yokoyama, Murielle Grangeon, Kei Masani, Milos R Popovic, Kimitaka Nakazawa, Dany H Gagnon
Spinal cord injury (SCI) can result in paralysis of trunk muscles, which can affect sitting balance. The objective of this study was to analyze trunk muscle coordination of individuals with thoracic SCI and compare it to able-body individuals. A total of 27 individuals were recruited and subdivided into: (a) high thoracic SCI; (b) low thoracic SCI; and (c) able-body groups. Participants were seated and asked to lean their trunk in eight directions while trunk muscle activity was recorded. Muscle coordination was assessed using the non-negative matrix factorization (NMF) method to extract muscle modules, which are the synergistic trunk muscle activations, and their directional activation patterns...
October 2017: Journal of Electromyography and Kinesiology
https://www.readbyqxmd.com/read/28719820/intrarater-reliability-and-agreement-of-linear-encoder-derived-heel-rise-endurance-test-outcome-measures-in-healthy-adults
#18
Christopher Byrne, David J Keene, Sarah E Lamb, Keith Willett
A linear encoder measuring vertical displacement during the heel-rise endurance test (HRET) enables the assessment of work and maximum height in addition to the traditional repetitions measure. We aimed to compare the test-retest reliability and agreement of these three outcome measures. Thirty-eight healthy participants (20 females, 18 males) performed the HRET on two occasions separated by a minimum of seven days. Reliability was assessed by the intraclass correlation coefficient (ICC) and agreement by a range of measures including the standard error of measurement (SEM), coefficient of variation (CV), and 95% limits of agreement (LoA)...
October 2017: Journal of Electromyography and Kinesiology
https://www.readbyqxmd.com/read/28688293/a-new-parameter-for-quantifying-the-variability-of-surface-electromyographic-signals-during-gait-the-occurrence-frequency
#19
Francesco Di Nardo, Alessandro Mengarelli, Annachiara Strazza, Valentina Agostini, Marco Knaflitz, Laura Burattini, Sandro Fioretti
Natural variability of myoelectric activity during walking was recently analyzed considering hundreds of strides. This allowed assessing a parameter seldom considered in classic surface EMG (sEMG) studies: the occurrence frequency, defined as the frequency each muscle activation occurs with, quantified by the number of strides when a muscle is recruited with that specific activation modality. Aim of present study was to propose the occurrence frequency as a new parameter for assessing sEMG-signal variability during walking...
October 2017: Journal of Electromyography and Kinesiology
https://www.readbyqxmd.com/read/28662461/standing-on-wedges-modifies-side-specific-postural-control-in-the-presence-of-lateral-external-perturbations
#20
Yun-Ju Lee, Jing-Nong Liang, Bing Chen, Mohan Ganesan, Alexander S Aruin
Standing on wedges changes the position in the ankle joints and affects postural stability in the medial-lateral direction. The objective of the study was to investigate the role of wedges and external lateral perturbations on anticipatory (APA) and compensatory postural adjustments (CPA). Ten healthy young participants were exposed to perturbations applied to the lateral part of their right shoulder when standing on a planar surface, on a medial or lateral wedges. Bilateral electromyographic activity of dorsal and ventral postural muscles and the center of pressure (COP) displacement were recorded and analyzed during the APA and CPA phases...
October 2017: Journal of Electromyography and Kinesiology
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