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https://www.readbyqxmd.com/read/28214295/blood-flow-restriction-increases-metabolic-stress-but-decreases-muscle-activation-during-high-load-resistance-exercise
#1
Emerson L Teixeira, Renato Barroso, Carla Silva-Batista, Gilberto C Laurentino, Jeremy P Loenneke, Hamilton Roschel, Carlos Ugrinowitsch, Valmor Tricoli
INTRODUCTION: We investigated differences in metabolic stress (lactate) and muscle activation (electromyography) when high load exercise is compared to a condition where blood flow restriction (BFR) is applied during the exercise or during the rest interval. METHODS: Twelve participants performed high load resistance exercise with BFR during the intervals (BFR-I), during the set (BFR-S) and without BFR (HL). Each condition consisted of 3 sets of 8 repetitions with knee-extension at 70% of one-repetition-maximum...
February 18, 2017: Muscle & Nerve
https://www.readbyqxmd.com/read/28212264/correlated-emg-oscillations-between-antagonists-during-cocontraction-in-men
#2
Yasuhide Yoshitake, Hiroaki Kanehisa, Minoru Shinohara
PURPOSE: The purpose of this study was to determine the modulation of common low-frequency oscillations in pools of motor units across antagonistic muscles because of the difference in the activation level of pools of spinal motor neurons and the presence of neuromuscular fatigue during intended cocontraction. METHODS: Ten healthy young men (21.8 ± 1.5 yr) performed intended steady cocontractions of elbow flexors and extensors at maximal and a submaximal (10% of maximal EMG) effort...
March 2017: Medicine and Science in Sports and Exercise
https://www.readbyqxmd.com/read/28211794/test-retest-reliability-of-muscle-fiber-conduction-velocity-and-fractal-dimension-of-surface-emg-during-isometric-contractions
#3
Matteo Beretta-Piccoli, Giuseppe D'Antona, Cristian Zampella, Marco Barbero, Ron Clijsen, Corrado Cescon
The aim of this study was to determine the test-retest reliability of muscle fiber conduction velocity (CV) and fractal dimension (FD) obtained from multichannel surface electromyographic (sEMG) recordings. Forty healthy recreationally active subjects (20 men and 20 women) performed two elbow flexions on two trials with a 1-week interval. The first was a 20% maximal voluntary contraction (MVC) of 120 s, and the second at 60% MVC held until exhaustion. sEMG signals were detected from the biceps brachii, using bi-dimensional arrays...
February 17, 2017: Physiological Measurement
https://www.readbyqxmd.com/read/28210047/the-effect-of-visual-field-condition-on-kinetic-in-upper-extremities-and-e-m-g-in-lower-extremities-while-performing-reaching-in-normal-adults
#4
Hyekang Park, Youngeun Kang, Minah Yoo, Bomjin Lee, Jeongok Yang, Joongsook Lee, Dongwook Han, Taeyoung Oh
[Purpose] The aims of this study was to investigate mean velocity and angle of shoulder joint, activation of tibialis anterior and gastrocnemius according to both eyes, dominant eye and non-dominant eye condition during reaching task in normal adults. [Subjects and Methods] Our research recruited 24 participants (male 11, female 13) in Silla University. Participants were performed reaching out movement by conditions of both eye, dominants eye, non-dominants eye. The target was placed at 45 degree diagonal direction and distance far away 130% of their arm length...
January 2017: Journal of Physical Therapy Science
https://www.readbyqxmd.com/read/28209741/frequency-characteristics-of-human-muscle-and-cortical-responses-evoked-by-noisy-achilles-tendon-vibration
#5
Robyn Lynne Mildren, Ryan M Peters, Aimee J Hill, Jean-Sebastien Blouin, Mark Gregory Carpenter, J Timothy Inglis
Noisy stimuli, along with linear systems analysis, have proven to be effective for mapping functional neural connections. We explored the use of noisy (10-115 Hz) Achilles tendon vibration to examine proprioceptive reflexes in the triceps surae muscles in standing healthy young adults (n = 8). We also examined the association between noisy vibration and electrical activity recorded over the sensorimotor cortex using electroencephalography. We applied two-minutes of vibration and recorded ongoing muscle activity of the soleus and gastrocnemii using surface electromyography (EMG)...
February 16, 2017: Journal of Applied Physiology
https://www.readbyqxmd.com/read/28209439/post-polio-syndrome-cases-report-and-review-of-literature
#6
Żanna Pastuszak, Adam Stępień, Kazimierz Tomczykiewicz, Renata Piusińska-Macoch, Dariusz Galbarczyk, Agnieszka Rolewska
It is estimated that around 15 million people survived polio infection worldwide since early twentieth century. In 1950 effective vaccination was used for first time. Since that time number of affected people decreased. The last epidemic of Haine-Medine disease in Poland was in 1950s. Another rare cases of infections were observed till 1970s. About at least 15 years after polio virus infection, slowly progressive muscle limbs paresis with muscle atrophy, joints pain, paresthesia were observed in polio survivors...
February 3, 2017: Neurologia i Neurochirurgia Polska
https://www.readbyqxmd.com/read/28202647/longitudinal-and-transversal-displacements-between-triceps-surae-muscles-during-locomotion-of-the-rat
#7
Michel Bernabei, Jaap H van Dieën, Huub Maas
The functional consequences of differential muscle activation and contractile behavior between mechanically coupled synergists are still poorly understood. Even though synergistic muscles exert similar mechanical effects at the joint they span, differences in the anatomy, morphology and neural drive may lead to non-uniform contractile conditions. This study aimed to investigate the patterns of activation and contractile behavior of triceps surae muscles, to understand how these contribute to the relative displacement between the one-joint soleus (SO) and two-joint lateral gastrocnemius (LG) muscle bellies and their distal tendons during locomotion in the rat...
February 15, 2017: Journal of Experimental Biology
https://www.readbyqxmd.com/read/28198605/the-effect-of-gymnastic-training-on-muscle-strength-and-co-activation-during-isometric-elbow-and-glenohumeral-flexion-extension
#8
Andrzej Kochanowicz, Bartłomiej Niespodziński, Jan Mieszkowski, Kazimierz Kochanowicz, Stanisław Sawczyn
BACKGROUND: The purpose of the study was to demonstrate the differences between non- athletes and gymnasts at the pre- and post-pubertal age in the development of peak torque and ensuing flexion/extension ratios at the elbow and the glenohumeral joints, as well as to assess the relevance of the above activities for the co-activation of selected muscles. METHODS: The study involved 20 gymnasts and 20 non-athletes aged 8-9 years, in addition to 12 gymnasts and 16 non-athletes aged 18-25 years...
February 14, 2017: Journal of Sports Medicine and Physical Fitness
https://www.readbyqxmd.com/read/28197674/role-of-vision-in-sighted-and-blind-soccer-players-in-adapting-to-an-unstable-balance-task
#9
María Campayo-Piernas, Carla Caballero, David Barbado, Raúl Reina
This study tested whether a compensatory hypothesis exists on postural control during standing unstable balance tasks comparing blind soccer players (n = 7) to sighted soccer players (n = 15) and sighted sedentary individuals (n = 6). All subjects performed a pre-test, a training of ten practice trials on a single day, and a post-test balance test. All tests were performed on an unstable surface placed on a force platform and under closed-eyes conditions, and a final test was performed with open eyes...
February 14, 2017: Experimental Brain Research. Experimentelle Hirnforschung. Expérimentation Cérébrale
https://www.readbyqxmd.com/read/28197354/neuromuscular-coordination-deficit-persists-12-months-after-acl-reconstruction-but-can-be-modulated-by-6-weeks-of-kettlebell-training-a-case-study-in-women-s-elite-soccer
#10
Mette K Zebis, Christoffer H Andersen, Jesper Bencke, Christina Ørntoft, Connie Linnebjerg, Per Hölmich, Kristian Thorborg, Per Aagaard, Lars L Andersen
The aim of the present single-case study was to investigate the effect of 6 weeks' kettlebell training on the neuromuscular risk profile for ACL injury in a high-risk athlete returning to sport after ACL reconstruction. A female elite soccer player (age 21 years) with no previous history of ACL injury went through neuromuscular screening as measured by EMG preactivity of vastus lateralis and semitendinosus during a standardized sidecutting maneuver. Subsequently, the player experienced a noncontact ACL injury...
2017: Case Reports in Orthopedics
https://www.readbyqxmd.com/read/28194659/activity-of-erector-spinae-during-trunk-forward-bending-and-backward-return-the-effects-of-age
#11
Iman Shojaei, Babak Bazrgari
Electromyography (EMG)-based measures of the trunk muscles behavior have been used for objective assessment of biomechanical impairments in patients with low back pain (LBP); yet the literature on normal age-related differences in such measures is scant. A cross-sectional study was designed to assess age-related differences in activity of trunk extensors during forward bending and backward return. Sixty asymptomatic individuals were recruited to form five gender-balanced age groups between 20 and 70 years old...
February 13, 2017: Annals of Biomedical Engineering
https://www.readbyqxmd.com/read/28192854/ingestion-of-trp-channel-agonists-attenuates-exercise-induced-muscle-cramps
#12
Daniel H Craighead, Sean W Shank, Jinger S Gottschall, Dennis H Passe, Bob Murray, Lacy M Alexander, W Larry Kenney
: Exercise associated muscle cramping (EAMC) is a poorly understood problem that is neuromuscular in origin. Ingestion of transient receptor potential (TRP) channel agonists has been efficacious in attenuating electrically-induced muscle cramps. PURPOSE: To examine the effect of TRP agonist ingestion on voluntarily-induced EAMC and motor function. METHODS: Study 1: 39 subjects completed 2 trials after ingesting TRP agonist-containing active treatment (A), or vehicle (V) control...
February 13, 2017: Muscle & Nerve
https://www.readbyqxmd.com/read/28192829/tens-alleviates-muscle-weakness-attributable-to-attenuation-of-ia-afferents
#13
Y Konishi, P J McNair, D A Rice
Quadriceps weakness is a notable problem following knee damage. Research has shown effectiveness of TENS in improving Quadriceps weakness associated with arthrogenic muscle inhibition. However, these studies were not focused upon short term delivery of TENS, nor did they examine the potential mechanism(s). The present study examined the effect of 25-30 s of TENS upon weakness induced temporarily by a prolonged vibration. Subjects performed eccentric MVCs under 2 conditions (TENS and no-TENS). First, MVC was measured at baseline...
February 13, 2017: International Journal of Sports Medicine
https://www.readbyqxmd.com/read/28192488/does-dystonic-muscle-activity-affect-sense-of-effort-in-cervical-dystonia
#14
Loïc Carment, Marc A Maier, Sophie Sangla, Vincent Guiraud, Serge Mesure, Marie Vidailhet, Påvel G Lindberg, Jean-Pierre Bleton
BACKGROUND: Focal dystonia has been associated with deficient processing of sense of effort cues. However, corresponding studies are lacking in cervical dystonia (CD). We hypothesized that dystonic muscle activity would perturb neck force control based on sense of effort cues. METHODS: Neck extension force control was investigated in 18 CD patients with different clinical features (7 with and 11 without retrocollis) and in 19 control subjects. Subjects performed force-matching and force-maintaining tasks at 5% and 20% of maximum voluntary contraction (MVC)...
2017: PloS One
https://www.readbyqxmd.com/read/28192079/electrical-neuromodulation-of-the-cervical-spinal-cord-facilitates-forelimb-skilled-function-recovery-in-spinal-cord-injured-rats
#15
Monzurul Alam, Guillermo Garcia-Alias, Benita Jin, Jonathan Keyes, Hui Zhong, Roland R Roy, Yury Gerasimenko, Daniel C Lu, V Reggie Edgerton
Enabling motor control by epidural electrical stimulation of the spinal cord is a promising therapeutic technique for the recovery of motor function after a spinal cord injury (SCI). Although epidural electrical stimulation has resulted in improvement in hindlimb motor function, it is unknown whether it has any therapeutic benefit for improving forelimb fine motor function after a cervical SCI. We tested whether trains of pulses delivered at spinal cord segments C6 and C8 would facilitate the recovery of forelimb fine motor control after a cervical SCI in rats...
February 9, 2017: Experimental Neurology
https://www.readbyqxmd.com/read/28191352/hybrid-assistive-neuromuscular-dynamic-stimulation-therapy-a-new-strategy-for-improving-upper-extremity-function-in-patients-with-hemiparesis-following-stroke
#16
REVIEW
Toshiyuki Fujiwara, Michiyuki Kawakami, Kaoru Honaga, Michi Tochikura, Kaoru Abe
Hybrid Assistive Neuromuscular Dynamic Stimulation (HANDS) therapy is one of the neurorehabilitation therapeutic approaches that facilitates the use of the paretic upper extremity (UE) in daily life by combining closed-loop electromyography- (EMG-) controlled neuromuscular electrical stimulation (NMES) with a wrist-hand splint. This closed-loop EMG-controlled NMES can change its stimulation intensity in direct proportion to the changes in voluntary generated EMG amplitudes recorded with surface electrodes placed on the target muscle...
2017: Neural Plasticity
https://www.readbyqxmd.com/read/28183689/game-based-rehabilitation-for-myoelectric-prosthesis-control
#17
Cosima Prahm, Ivan Vujaklija, Fares Kayali, Peter Purgathofer, Oskar C Aszmann
BACKGROUND: A high number of upper extremity myoelectric prosthesis users abandon their devices due to difficulties in prosthesis control and lack of motivation to train in absence of a physiotherapist. Virtual training systems, in the form of video games, provide patients with an entertaining and intuitive method for improved muscle coordination and improved overall control. Complementary to established rehabilitation protocols, it is highly beneficial for this virtual training process to start even before receiving the final prosthesis, and to be continued at home for as long as needed...
February 9, 2017: JMIR Serious Games
https://www.readbyqxmd.com/read/28183042/the-effect-of-asymmetrical-body-orientation-during-simulated-forward-falls-on-the-distal-upper-extremity-impact-response-of-healthy-people
#18
Timothy A Burkhart, Evan Brydges, Jennifer Stefanczyk, David M Andrews
The occurrence of distal upper extremity injuries resulting from forward falls (approximately 165,000 per year) has remained relatively constant for over 20years. Previous work has provided valuable insight into fall arrest strategies, but only symmetric falls in body postures that do not represent actual fall scenarios closely have been evaluated. This study quantified the effect of asymmetric loading and body postures on distal upper extremity response to simulated forward falls. Twenty participants were suspended from the Propelled Upper Limb fall ARest Impact System (PULARIS) in different torso and leg postures relative to the ground and to the sagittal plane (0°, 30° and 45°)...
January 27, 2017: Journal of Electromyography and Kinesiology
https://www.readbyqxmd.com/read/28181788/measuring-effectiveness-of-orthognathic-surgery-by-electromyography-a-restrospective-clinical-study
#19
Giovanni B Grossi, Umberto Garagiola, Franco Santoro
BACKGROUND: This study investigates retrospectively if the initial electromyography (EMG) status of patients who underwent orthognathic surgery correlates with the extent of post-surgical EMG functional recovery. METHODS: Clinical records concerning 20 patients who underwent Le Fort I and/or sagittal osteotomy of the mandibular ramus to correct skeletal dental class III malocclusions were retrieved and pre-surgical and post-surgical EMG data were analyzed and compared...
February 9, 2017: Minerva Stomatologica
https://www.readbyqxmd.com/read/28178184/a-3d-human-machine-integrated-design-and-analysis-framework-for-squat-exercises-with-a-smith-machine
#20
Haerin Lee, Moonki Jung, Ki-Kwang Lee, Sang Hun Lee
In this paper, we propose a three-dimensional design and evaluation framework and process based on a probabilistic-based motion synthesis algorithm and biomechanical analysis system for the design of the Smith machine and squat training programs. Moreover, we implemented a prototype system to validate the proposed framework. The framework consists of an integrated human-machine-environment model as well as a squat motion synthesis system and biomechanical analysis system. In the design and evaluation process, we created an integrated model in which interactions between a human body and machine or the ground are modeled as joints with constraints at contact points...
February 6, 2017: Sensors
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