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https://www.readbyqxmd.com/read/28544170/hamstring-injury-prevention-in-soccer-before-or-after-training
#1
Ric Lovell, Michael Knox, Matthew Weston, Jason C Siegler, Scott Brennan, Paul W M Marshall
We examined the effects of a 12-week program of Nordic hamstring exercises (NHE), administered before or after football training, upon eccentric hamstring strength, muscle activity, and architectural adaptations. Amateur soccer players were randomized into 3 groups. The control group (CON; n=11) undertook core stability exercises, whereas a periodized NHE program was delivered either before (NHEBEF ; n=10) or after (NHEAFT ; n=14) bi-weekly training sessions. Outcome measures included peak torque and concomitant normalized peak surface electromyography signals (sEMG) of the biceps femoris (BF) and medial hamstring (MH) muscles during knee flexor maximal eccentric contractions, performed at 30°·s(-1) ...
May 24, 2017: Scandinavian Journal of Medicine & Science in Sports
https://www.readbyqxmd.com/read/28544083/evaluating-abdominal-core-muscle-fatigue-assessment-of-the-validity-and-reliability-of-the-prone-bridging-test
#2
Cedric De Blaiser, Roel De Ridder, Tine Willems, Lieven Danneels, Luc Vanden Bossche, Tanneke Palmans, Philip Roosen
The aims of present study were to research the amplitude and median frequency characteristics of selected abdominal, back and hip muscles of healthy subjects during a prone bridging endurance test, based on surface electromyography (sEMG), (1) to determine if the prone bridging test is a valid field test to measure abdominal muscle fatigue, and (2) to evaluate if the current method of administrating the prone bridging test is reliable. Thirty healthy subjects participated in this experiment. The sEMG activity of seven abdominal, back and hip muscles was bilaterally measured...
May 24, 2017: Scandinavian Journal of Medicine & Science in Sports
https://www.readbyqxmd.com/read/28522976/trunk-muscle-activity-during-drop-jump-performance-in-adolescent-athletes-with-back-pain
#3
Steffen Mueller, Josefine Stoll, Juliane Mueller, Michael Cassel, Frank Mayer
In the context of back pain, great emphasis has been placed on the importance of trunk stability, especially in situations requiring compensation of repetitive, intense loading induced during high-performance activities, e.g., jumping or landing. This study aims to evaluate trunk muscle activity during drop jump in adolescent athletes with back pain (BP) compared to athletes without back pain (NBP). Eleven adolescent athletes suffering back pain (BP: m/f: n = 4/7; 15.9 ± 1.3 y; 176 ± 11 cm; 68 ± 11 kg; 12...
2017: Frontiers in Physiology
https://www.readbyqxmd.com/read/28513278/infraspinatus-isolation-during-external-rotation-exercise-at-varying-degrees-of-abduction
#4
Gareth Ryan, Heather Johnston, Janice Moreside
CONTEXT: External rotation (ER) strengthening exercises are a common component of shoulder injury prevention and rehabilitation programs. They are primarily intended to target the infraspinatus muscle, based on its role in glenohumeral stabilization and inferior humeral glide. ER also recruits the posterior deltoid, which can be undesirable due to its role in subacromial space narrowing. OBJECTIVE: To determine the angle of humeral abduction that maximizes the infraspinatus to posterior deltoid activation ratio (INFRA/PD) during ER...
May 17, 2017: Journal of Sport Rehabilitation
https://www.readbyqxmd.com/read/28511122/robotic-assessment-of-neuromuscular-characteristics-using-musculoskeletal-models-a-pilot-study
#5
V R Jayaneththi, J Viloria, L G Wiedemann, C Jarrett, A J McDaid
OBJECTIVE: Non-invasive neuromuscular characterization aims to provide greater insight into the effectiveness of existing and emerging rehabilitation therapies by quantifying neuromuscular characteristics relating to force production, muscle viscoelasticity and voluntary neural activation. In this paper, we propose a novel approach to evaluate neuromuscular characteristics, such as muscle fiber stiffness and viscosity, by combining robotic and HD-sEMG measurements with computational musculoskeletal modeling...
May 10, 2017: Computers in Biology and Medicine
https://www.readbyqxmd.com/read/28504930/extracorporeal-stimulation-of-sacral-nerve-roots-for-observation-of-pelvic-autonomic-nerve-integrity-description-of-a-novel-methodological-setup
#6
Tomasz Moszkowski, Daniel Kauff, Celine Wegner, Roman Ruff, Karin Somerlik-Fuchs, Thilo Krueger, Piotr Augustyniak, Klaus-Peter Hoffmann, Werner Kneist
INTRODUCTION: Neurophysiologic monitoring can improve autonomic nerve sparing during critical phases of rectal cancer surgery. OBJECTIVES: To develop a system for extracorporeal stimulation of sacral nerve roots. METHODS: Dedicated software controlled a ten-electrode stimulation array by switching between different electrode configurations and current levels. A built-in impedance and current level measurement assessed the effectiveness of current injection...
May 12, 2017: IEEE Transactions on Bio-medical Engineering
https://www.readbyqxmd.com/read/28499143/differences-between-clinician-and-self-administered-shoulder-sustained-mobilization-on-scapular-and-shoulder-muscle-activity-during-shoulder-abduction-a-repeated-measures-study-on-asymptomatic-individuals
#7
Daniel Cury Ribeiro, Gisela Sole, Ramu Venkat, Jonathan Shemmell
BACKGROUND: Sustained glenohumeral postero-lateral glide administered by a clinician is commonly used in the management of patients with shoulder pain. This technique reduced shoulder muscle activity in asymptomatic individuals, but it is unknown whether a self-administered version of the mobilization leads to similar neuromuscular response. This study compared the effect of sustained shoulder mobilizations (performed by a physiotherapist) with self-administered mobilization (with a belt) on activity levels of scapular and glenohumeral shoulder muscles...
May 1, 2017: Musculoskeletal Science & Practice
https://www.readbyqxmd.com/read/28497771/an-isometric-muscle-force-estimation-framework-based-on-a-high-density-surface-emg-array-and-an-nmf-algorithm
#8
Chengjun Huang, Xiang Chen, Shuai Cao, Bensheng Qiu, Xu Zhang
OBJECTIVE: To realize accurate muscle force estimation, a novel framework is proposed in this paper which can extract the input of the prediction model from the appropriate activation area of the skeletal muscle. APPROACH: Surface electromyographic (sEMG) signals from the biceps brachii muscle during isometric elbow flexion were collected with a high-density (HD) electrode grid (128 channels) and the external force at three contraction levels was measured at the wrist synchronously...
May 12, 2017: Journal of Neural Engineering
https://www.readbyqxmd.com/read/28497068/effects-of-force-load-muscle-fatigue-and-magnetic-stimulation-on-surface-electromyography-during-side-arm-lateral-raise-task-a-preliminary-study-with-healthy-subjects
#9
Liu Cao, Ying Wang, Dongmei Hao, Yao Rong, Lin Yang, Song Zhang, Dingchang Zheng
The aim of this study was to quantitatively investigate the effects of force load, muscle fatigue, and extremely low-frequency (ELF) magnetic stimulation on surface electromyography (SEMG) signal features during side arm lateral raise task. SEMG signals were recorded from 18 healthy subjects on the anterior deltoid using a BIOSEMI ActiveTwo system during side lateral raise task (with the right arm 90 degrees away from the body) with three different loads on the forearm (0 kg, 1 kg, and 3 kg; their order was randomized between subjects)...
2017: BioMed Research International
https://www.readbyqxmd.com/read/28494371/improving-surface-emg-burst-detection-in-infrahyoid-muscles-during-swallowing-using-digital-filters-and-discrete-wavelet-analysis
#10
Sebastian Restrepo-Agudelo, Sebastian Roldan-Vasco, Lina Ramirez-Arbelaez, Santiago Cadavid-Arboleda, Estefania Perez-Giraldo, Andres Orozco-Duque
The visual inspection is a widely used method for evaluating the surface electromyographic signal (sEMG) during deglutition, a process highly dependent of the examiners expertise. It is desirable to have a less subjective and automated technique to improve the onset detection in swallowing related muscles, which have a low signal-to-noise ratio. In this work, we acquired sEMG measured in infrahyoid muscles with high baseline noise of ten healthy adults during water swallowing tasks. Two methods were applied to find the combination of cutoff frequencies that achieve the most accurate onset detection: discrete wavelet decomposition based method and fixed steps variations of low and high cutoff frequencies of a digital bandpass filter...
May 3, 2017: Journal of Electromyography and Kinesiology
https://www.readbyqxmd.com/read/28486092/evaluating-the-ergonomic-benefit-of-a-wrist-brace-on-wrist-posture-muscle-activity-rotational-stiffness-and-peak-shovel-ground-impact-force-during-a-simulated-tree-planting-task
#11
Peter J Sheahan, Joshua G A Cashaback, Steven L Fischer
Background Tree planters are at a high risk for wrist injury due to awkward postures and high wrist loads experienced during each planting cycle, specifically at shovel-ground impact. Wrist joint stiffness provides a measure that integrates postural and loading information. Objective The purpose of this study was to evaluate wrist joint stiffness requirements at the instant of shovel-ground impact during tree planting and determine if a wrist brace could alter muscular contributions to wrist joint stiffness...
May 1, 2017: Human Factors
https://www.readbyqxmd.com/read/28483248/electromyographic-ratio-of-masseter-and-anterior-temporalis-muscles-in-children-with-and-without-temporomandibular-disorders
#12
Thaís Cristina Chaves, Aroldo Dos Santos Aguiar, Lilian Ramiro Felicio, Stella Maris Greghi, Simone Cecilio Hallak Regalo, Débora Bevilaqua-Grossi
OBJECTIVE: This study investigated differences in surface electromyography (sEMG) activity of the masseter and anterior temporalis muscles in children with and without temporomandibular disorders (TMD). PARTICIPANTS: Thirty-four children aged 8-12 years were recruited, comprising 17 children with TMD and 17 without TMD (control group [CG]). The children were quasi-matched for sex, age, weight, and height. sEMG data were obtained using Myosystem(®) Br-1 equipment with 12 channels to evaluate the bilateral masseter, anterior temporalis, and suprahyoid muscles...
June 2017: International Journal of Pediatric Otorhinolaryngology
https://www.readbyqxmd.com/read/28457405/diaphragm-muscle-surface-electromyography-in-patients-submitted-to-liver-transplant-and-eligible-for-extubation
#13
R P Duarte, A C Sentanin, A M O da Silva, R M Tonella, G L Duarte, L S R Ratti, I F S F Boin
INTRODUCTION: Liver disease induces many organic and metabolic changes, leading to malnutrition and weight and muscular function loss. Surface electromyography is an easily applicable, noninvasive study, through which the magnitudes of the peaks on the charts depict voluntary muscle activity. AIM: To evaluate the diaphragmatic surface electromyography of postoperative liver transplantation subjects. METHODS: Subjects were patients who underwent liver transplantation and extubation in the Clinical Hospital of State University of Campinas...
May 2017: Transplantation Proceedings
https://www.readbyqxmd.com/read/28455942/the-evaluation-of-pelvic-floor-muscle-strength-in-women-with-pelvic-floor-dysfunction-a-reliability-and-correlation-study
#14
Beatriz Navarro Brazález, María Torres Lacomba, Pedro de la Villa, Beatriz Sánchez Sánchez, Virginia Prieto Gómez, Ángel Asúnsolo Del Barco, Linda McLean
AIMS: The purposes of this study were: (i) to evaluate the reliability of vaginal palpation, vaginal manometry, vaginal dynamometry; and surface (transperineal) electromyography (sEMG), when evaluating pelvic floor muscle (PFM) strength and/or activation; and (ii) to determine the associations among PFM strength measured using these assessments. METHODS: One hundred and fifty women with pelvic floor disorders participated on one occasion, and 20 women returned for the same investigations by two different raters on 3 different days...
April 28, 2017: Neurourology and Urodynamics
https://www.readbyqxmd.com/read/28450730/effectiveness-of-immersive-videos-in-inducing-awe-an-experimental-study
#15
Alice Chirico, Pietro Cipresso, David B Yaden, Federica Biassoni, Giuseppe Riva, Andrea Gaggioli
Awe, a complex emotion composed by the appraisal components of vastness and need for accommodation, is a profound and often meaningful experience. Despite its importance, psychologists have only recently begun empirical study of awe. At the experimental level, a main issue concerns how to elicit high intensity awe experiences in the lab. To address this issue, Virtual Reality (VR) has been proposed as a potential solution. Here, we considered the highest realistic form of VR: immersive videos. 42 participants watched at immersive and normal 2D videos displaying an awe or a neutral content...
April 27, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28448852/reproducibility-of-scapular-muscle-activity-in-isokinetic-shoulder-flexion-and-extension
#16
Monique Wochatz, Sophie Rabe, Martin Wolter, Tilman Engel, Steffen Mueller, Frank Mayer
Repetitive overhead movements have been identified as a main risk factor to develop shoulder complaints with scapular muscle activity being altered. Reliable assessment of muscle activity is essential to differentiate between symptomatic and asymptomatic individuals. Therefore, the present study aimed to investigate the intra- and inter-session reliability of scapular muscle activity during maximal isokinetic shoulder flexion and extension. Eleven asymptomatic adults performed maximum effort isokinetic shoulder flexion and extension (concentric and eccentric at 60°/s) in a test-retest design...
April 13, 2017: Journal of Electromyography and Kinesiology
https://www.readbyqxmd.com/read/28423987/reproducibility-of-upper-leg-emg-frequency-content-during-cycling
#17
Rodrigo Rico Bini, Camila Peter Hoefelmann, Vitor Pereira Costa, Fernando Diefenthaeler
Reproducibility of frequency content from surface electromyography (sEMG) signals has not been assessed and it is unknown if incremental load testing design could affect sEMG in cycling. The goals of this study were to assess the reproducibility of measures from sEMG frequency content between sessions and to compare these frequency components between a ramp and a step incremental cycling test. Eighteen cyclists performed four incremental load cycling tests to exhaustion. Two tests were performed using a step increment (load started at 100 W for 3 min followed by increments of 30 W every 3 min) and two were performed using a ramp increment (load started at 100 W for 1 min followed by increments of 30 W·min(-1))...
April 20, 2017: Journal of Sports Sciences
https://www.readbyqxmd.com/read/28413069/improving-the-upper-limb-force-feasible-set-evaluation-by-muscles-maximal-isometric-force-identification-and-cocontraction-factors
#18
Vincent Hernandez, Gentiane Venture, Nasser Rezzoug, Philippe Gorce
In order to improve the evaluation of the force feasible set (FFS) of the upper-limb which is of great interest in the biomechanics field, this study proposes two additional techniques. The first one is based on the identification of the maximal isometric force (MIF) of Hill-based muscles models from sEMG and isometric force measurements at the hand. The second one considers muscles cocontraction. The FFS was computed with an upper-limb musculoskeletal model in three different cases. The first one (M1) considered binary muscular activation and a simple MIF scaling method based on the weight and muscle length of the subject...
April 4, 2017: Journal of Biomechanics
https://www.readbyqxmd.com/read/28406945/predicting-3d-lip-shapes-using-facial-surface-emg
#19
Merijn Eskes, Maarten J A van Alphen, Alfons J M Balm, Ludi E Smeele, Dieta Brandsma, Ferdinand van der Heijden
AIM: The aim of this study is to prove that facial surface electromyography (sEMG) conveys sufficient information to predict 3D lip shapes. High sEMG predictive accuracy implies we could train a neural control model for activation of biomechanical models by simultaneously recording sEMG signals and their associated motions. MATERIALS AND METHODS: With a stereo camera set-up, we recorded 3D lip shapes and simultaneously performed sEMG measurements of the facial muscles, applying principal component analysis (PCA) and a modified general regression neural network (GRNN) to link the sEMG measurements to 3D lip shapes...
2017: PloS One
https://www.readbyqxmd.com/read/28391722/eversion-strength-and-surface-electromyography-measures-with-and-without-chronic-ankle-instability-measured-in-2-positions
#20
Lindsy Donnelly, Luke Donovan, Joseph M Hart, Jay Hertel
BACKGROUND: Individuals with chronic ankle instability (CAI) have demonstrated strength deficits compared to healthy controls; however, the influence of ankle position on force measures and surface electromyography (sEMG) activation of the peroneus longus and brevis has not been investigated. The purpose of this study was to compare sEMG amplitudes of the peroneus longus and brevis and eversion force measures in 2 testing positions, neutral and plantarflexion, in groups with and without CAI...
April 1, 2017: Foot & Ankle International
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