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https://www.readbyqxmd.com/read/28926802/patterns-of-trunk-muscle-activation-during-walking-and-pole-walking-using-statistical-non-parametric-mapping
#1
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/28922049/magnitudes-of-muscle-activation-of-spine-stabilizers-in-healthy-adults-during-prone-on-elbow-planking-exercises-with-and-without-a-fitness-ball
#2
James W Youdas, Kendra C Coleman, Erin E Holstad, Stephanie D Long, Nicole L Veldkamp, John H Hollman
Prone planking exercises have been used by rehabilitation professionals to activate torso muscles in healthy persons and those with low back pain. The aim of this study was to compare the magnitude of electromyographic (EMG) muscle activation from 10 right-sided muscles as demonstrated by the percentage of maximum voluntary isometric contraction (%MVIC) during four planking procedures. Surface EMG activity was acquired from the following muscles: (1) iliocostalis lumborum (IL), (2) longissimus thoracis (LT), (3) lumbar multifidus (LM), (4) rectus abdominis (RA), (5) external oblique (EO), (6) internal oblique (IO), (7) serratus anterior (SA), (8) latissimus dorsi (LD), (9) hamstrings (HS), and (10) gluteus maximus (GM)...
September 18, 2017: Physiotherapy Theory and Practice
https://www.readbyqxmd.com/read/28921744/cholinergic-basal-forebrain-structures-are-not-essential-for-mediation-of-the-arousing-action-of-glutamate
#3
Zoltán Lelkes, Shamsiiat Abdurakhmanova, Tarja Porkka-Heiskanen
The cholinergic basal forebrain contributes to cortical activation and receives rich innervations from the ascending activating system. It is involved in the mediation of the arousing actions of noradrenaline and histamine. Glutamatergic stimulation in the basal forebrain results in cortical acetylcholine release and suppression of sleep. However, it is not known to what extent the cholinergic versus non-cholinergic basal forebrain projection neurones contribute to the arousing action of glutamate. To clarify this question, we administered N-methyl-D-aspartate (NMDA), a glutamate agonist, into the basal forebrain in intact rats and after destruction of the cholinergic cells in the basal forebrain with 192 immunoglobulin (Ig)G-saporin...
September 18, 2017: Journal of Sleep Research
https://www.readbyqxmd.com/read/28921633/spontaneous-mechanical-and-electrical-activities-of-human-calf-musculature-at-rest-assessed-by-repetitive-single-shot-diffusion-weighted-mri-and-simultaneous-surface-electromyography
#4
Martin Schwartz, Günter Steidle, Petros Martirosian, Ander Ramos-Murguialday, Hubert Preißl, Alto Stemmer, Bin Yang, Fritz Schick
PURPOSE: Assessment of temporal and spatial relations between spontaneous mechanical activities in musculature (SMAM) at rest as revealed by diffusion-weighted imaging (DWI) and electrical muscular activities in surface EMG (sEMG). Potential influences of static and radiofrequency magnetic fields on muscular activity on sEMG measurements at rest were examined systematically. METHODS: Series of diffusion-weighted stimulated echo planar imaging were recorded with concurrent sEMG measurements...
September 17, 2017: Magnetic Resonance in Medicine: Official Journal of the Society of Magnetic Resonance in Medicine
https://www.readbyqxmd.com/read/28918109/precision-based-guidelines-for-sub-maximal-normalisation-task-selection-for-trunk-extensor-emg
#5
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/28915821/assessment-of-the-underlying-systems-involved-in-standing-balance-the-additional-value-of-electromyography-in-system-identification-and-parameter-estimation
#6
J H Pasma, J van Kordelaar, D de Kam, V Weerdesteyn, A C Schouten, H van der Kooij
BACKGROUND: Closed loop system identification (CLSIT) is a method to disentangle the contribution of underlying systems in standing balance. We investigated whether taking into account lower leg muscle activation in CLSIT could improve the reliability and accuracy of estimated parameters identifying the underlying systems. METHODS: Standing balance behaviour of 20 healthy young participants was measured using continuous rotations of the support surface (SS). The dynamic balance behaviour obtained with CLSIT was expressed by sensitivity functions of the ankle torque, body sway and muscle activation of the lower legs to the SS rotation...
September 15, 2017: Journal of Neuroengineering and Rehabilitation
https://www.readbyqxmd.com/read/28912700/action-direction-of-muscle-synergies-in-voluntary-multi-directional-postural-control
#7
Akari Kubo, Shota Hagio, Benio Kibushi, Toshio Moritani, Motoki Kouzaki
A muscle synergy is a coordinative structure of muscles that has been proposed as a strategy to reduce the number of variables that the central nervous system (CNS) has to address in motor tasks. In this article, the mechanical contribution of muscle synergies and coordinative structures of muscles in voluntary multi-directional postural control were investigated. The task for healthy, young subjects was to shift and align their center of pressure (COP) to targets dispersed in 12 different directions in the horizontal plane by leaning their bodies for 10 s...
2017: Frontiers in Human Neuroscience
https://www.readbyqxmd.com/read/28906348/effect-of-anodal-transcranial-direct-current-stimulation-of-the-motor-cortex-on-elbow-flexor-muscle-strength-in-the-very-old
#8
Kentaro Oki, Leatha A Clark, Shinichi Amano, Brian C Clark
BACKGROUND AND PURPOSE: Muscle weakness predisposes older adults to a fourfold increase in functional limitations and has previously been associated with reduced motor cortex excitability in aging adults. The purpose of this study was to determine whether a single session of anodal transcranial direct current stimulation (tDCS) of the motor cortex would increase elbow flexion muscle strength and electromyographic (EMG) amplitude in very old individuals. METHODS: Eleven very old individuals-85...
September 12, 2017: Journal of Geriatric Physical Therapy
https://www.readbyqxmd.com/read/28904105/contribution-of-sensory-feedback-to-plantar-flexor-muscle-activation-during-push-off-in-adults-with-cerebral-palsy
#9
Rasmus Feld Frisk, Peter Jensen, Henrik Kirk, Laurent J Bouyer, Jakob Lorentzen, Jens Bo Nielsen
INTRODUCTION: Exaggerated sensory activity has been assumed to contribute to functional impairment following lesion of the central motor pathway. However, recent studies have suggested that sensory contribution to muscle activity during gait is reduced in stroke patients and children with cerebral palsy (CP). We investigated whether this also occurs in CP adults and whether daily treadmill training is accompanied by alterations in sensory contribution to muscle activity. MATERIALS AND METHODS: 17 CP adults and 12 uninjured individuals participated...
September 13, 2017: Journal of Neurophysiology
https://www.readbyqxmd.com/read/28902682/the-influence-of-foot-strike-technique-on-the-neuromechanical-function-of-the-foot
#10
Luke A Kelly, Dominic J Farris, Glen A Lichtwark, Andrew G Cresswell
PURPOSE: The aim of this study was to investigate the influence of foot-strike technique on longitudinal arch mechanics and intrinsic foot muscle function during running. METHODS: 13 healthy participants ran barefoot on a force-instrumented treadmill at 2.8ms with a forefoot (FFS) and rear-foot (RFS, habitual) running technique, while kinetic, kinematic and electromyographic (EMG) data from the intrinsic foot muscles were collected simultaneously. The longitudinal arch was modeled as a single "mid-foot" joint representing motion of the rear-foot (calcaneus) relative to the forefoot (metatarsals)...
September 11, 2017: Medicine and Science in Sports and Exercise
https://www.readbyqxmd.com/read/28902116/adding-whole-body-vibration-to-preconditioning-squat-exercise-increases-cycling-sprint-performance
#11
Sébastien Duc, Bent R Rønnestad, William Bertucci
This study investigated the effect of performing a preconditioning exercise with or without whole-body vibration (WBV) on a subsequent cycling sprint performance. Fourteen trained subjects performed two separate test sessions in randomized order. After a warm-up, the preconditioning exercise (body-loaded half squats) was applied: 30-seconds of half-squats with WBV (40 Hz, 2 mm) or 30-seconds of half-squats without WBV with a 10-second all-out sprint performed after one minute. Surface electromyography (EMG) was measured from the vastus medialis, vastus lateralis and gastrocnemius medialis during the sprints...
September 6, 2017: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/28902108/effects-of-two-different-self-adapted-occlusal-splints-on-electromyographic-and-force-parameters-during-elbow-flexors-isometric-contraction
#12
Eloisa Limonta, Chiara Arienti, Susanna Rampichini, Massimo Venturelli, Emiliano Cè, Arsenio Veicsteinas, Fabio Esposito
The study was aimed at determining the acute effects of two types of occlusal splints on maximum isometric strength and fatigue of the elbow flexors muscles. The hypothesis was that splint-induced masticatory muscle repositioning might improve primary muscles recruitment by stretching masticatory muscles especially with the thicker splint.On nine physically active volunteers with no temporo-mandibular joint and masticatory muscles disorders, we assessed maximum voluntary contraction (MVC) of the elbow flexors with diurnal (OSD, 1-mm thick) and sport (OSSP, 3-mm thick) splints, and without splint (control, Ctrl)...
September 6, 2017: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/28900782/why-are-antagonist-muscles-co-activated-in-my-simulation-a-musculoskeletal-model-for-analysing-human-locomotor-tasks
#13
Adrian K M Lai, Allison S Arnold, James M Wakeling
Existing "off-the-shelf" musculoskeletal models are problematic when simulating movements that involve substantial hip and knee flexion, such as the upstroke of pedalling, because they tend to generate excessive passive fibre force. The goal of this study was to develop a refined musculoskeletal model capable of simulating pedalling and fast running, in addition to walking, which predicts the activation patterns of muscles better than existing models. Specifically, we tested whether the anomalous co-activation of antagonist muscles, commonly observed in simulations, could be resolved if the passive forces generated by the underlying model were diminished...
September 12, 2017: Annals of Biomedical Engineering
https://www.readbyqxmd.com/read/28900719/the-effects-of-exercise-induced-muscle-damage-on-critical-torque
#14
Marcin K Szczyglowski, Carl J Ade, Jason A Campbell, Christopher D Black
OBJECTIVE: Exercise-induced muscle damage (EIMD) has been shown to reduce endurance exercise performance. This study examined the effects of EIMD on critical torque (CT) and the sum of the torque integral above CT during (∫ T total) during a 5-min all-out, intermittent isometric knee extension exercise. METHODS: CT was determined in eight participants prior to and 48-h following EIMD. EIMD was induced using electrically stimulated eccentric knee extensions until maximal voluntary strength (MVC) was reduced by 40%...
September 12, 2017: European Journal of Applied Physiology
https://www.readbyqxmd.com/read/28900561/effects-of-a-band-loop-on-lower-extremity-muscle-activity-and-kinematics-during-the-barbell-squat
#15
Ryan C A Foley, Brittany D Bulbrook, Duane C Button, Michael W R Holmes
BACKGROUND: Medial knee collapse can signal an underlying movement issue that, if uncorrected, can lead to a variety of knee injuries. Placing a band around the distal thigh may act as a proprioceptive aid to minimize medial collapse of the knee during squats; however, little is known about EMG and biomechanics in trained and untrained individuals during the squat with an elastic band added. HYPOTHESIS/PURPOSE: To investigate the effects of the TheraBand® Band Loop on kinematics and muscle activity of the lower extremity during a standard barbell back squat at different intensities in both trained and untrained individuals...
August 2017: International Journal of Sports Physical Therapy
https://www.readbyqxmd.com/read/28900560/building-a-better-gluteal-bridge-electromyographic-analysis-of-hip-muscle-activity-during-modified-single-leg-bridges
#16
B J Lehecka, Michael Edwards, Ryan Haverkamp, Lani Martin, Kambry Porter, Kailey Thach, Richard J Sack, Nils A Hakansson
BACKGROUND: Gluteal strength plays a role in injury prevention, normal gait patterns, eliminating pain, and enhancing athletic performance. Research shows high gluteal muscle activity during a single-leg bridge compared to other gluteal strengthening exercises; however, prior studies have primarily measured muscle activity with the active lower extremity starting in 90 ° of knee flexion with an extended contralateral knee. This standard position has caused reports of hamstring cramping, which may impede optimal gluteal strengthening...
August 2017: International Journal of Sports Physical Therapy
https://www.readbyqxmd.com/read/28900414/alterations-in-spectral-attributes-of-surface-electromyograms-after-utilization-of-a-foot-drop-stimulator-during-post-stroke-gait
#17
Rakesh Pilkar, Arvind Ramanujam, Karen J Nolan
BACKGROUND: A foot drop stimulator (FDS) is a rehabilitation intervention that stimulates the common peroneal nerve to facilitate ankle dorsiflexion at the appropriate time during post-stroke hemiplegic gait. Time-frequency analysis (TFA) of non-stationary surface electromyograms (EMG) and spectral variables such as instantaneous mean frequency (IMNF) can provide valuable information on the long-term effects of FDS intervention in terms of changes in the motor unit (MU) recruitment during gait, secondary to improved dorsiflexion...
2017: Frontiers in Neurology
https://www.readbyqxmd.com/read/28895466/lower-limb-muscle-activity-during-table-tennis-strokes
#18
Yann Le Mansec, Sylvain Dorel, François Hug, Marc Jubeau
This study aimed to compare the muscle activity of lower limbs across typical table tennis strokes. Fourteen high-level players participated in this study in which five typical strokes (backhand top, forehand top, forehand spin, forehand smash, flick) were analysed. Surface electromyography activity (EMG) of eight muscles was recorded (gluteus maximus, biceps femoris, vastus medialis, vastus lateralis, rectus femoris, gastrocnemius medialis, gastrocnemius lateralis, soleus) and normalised to the maximal activity measured during squat jump or isometric maximal voluntary contractions...
September 12, 2017: Sports Biomechanics
https://www.readbyqxmd.com/read/28894422/does-heel-height-cause-imbalance-during-sit-to-stand-task-surface-emg-perspective
#19
Ganesh R Naik, Ahmed Al-Ani, Massimiliano Gobbo, Hung T Nguyen
The purpose of this study was to determine whether electromyography (EMG) muscle activities around the knee differ during sit-to-stand (STS) and returning task for females wearing shoes with different heel heights. Sixteen healthy young women (age = 25.2 ± 3.9 years, body mass index = 20.8 ± 2.7 kg/m(2)) participated in this study. Electromyography signals were recorded from the two muscles, vastus medialis (VM) and vastus lateralis (VL) that involve in the extension of knee. The participants wore shoes with five different heights, including 4, 6, 8, 10, and 12 cm...
2017: Frontiers in Physiology
https://www.readbyqxmd.com/read/28893295/a-brain-computer-interface-driven-by-imagining-different-force-loads-on-a-single-hand-an-online-feasibility-study
#20
Kun Wang, Zhongpeng Wang, Yi Guo, Feng He, Hongzhi Qi, Minpeng Xu, Dong Ming
BACKGROUND: Motor imagery (MI) induced EEG patterns are widely used as control signals for brain-computer interfaces (BCIs). Kinetic and kinematic factors have been proved to be able to change EEG patterns during motor execution and motor imagery. However, to our knowledge, there is still no literature reporting an effective online MI-BCI using kinetic factor regulated EEG oscillations. This study proposed a novel MI-BCI paradigm in which users can online output multiple commands by imagining clenching their right hand with different force loads...
September 11, 2017: Journal of Neuroengineering and Rehabilitation
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