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https://www.readbyqxmd.com/read/28100652/correlation-between-discharge-timings-of-pairs-of-motor-units-reveals-the-presence-but-not-the-proportion-of-common-synaptic-input-to-motor-neurons
#1
Javier Rodriguez-Falces, Francesco Negro, Dario Farina
We investigated whether correlation measures derived from pairs of motor unit (MU) spike trains are reliable indicators of the degree of common synaptic input to motor neurons. Several 50-s isometric contractions of the biceps brachii muscle were performed at different target forces ranging from 10 to 30% of the maximal voluntary contraction (MVC) relying on force feedback. 48 pairs of MUs were examined at various force levels. Motor unit synchrony was assessed by cross-correlation analysis using three indices: the output correlation as the peak of the cross-histogram (ρ), the number of synchronous spikes per second (CIS), and per trigger (E)...
January 18, 2017: Journal of Neurophysiology
https://www.readbyqxmd.com/read/28099194/chronic-resistance-training-does-not-ameliorate-unloading-induced-decrements-in-neuromuscular-function
#2
Michael R Deschenes, Raymond W McCoy, Katherine A Mangis
OBJECTIVE: The aim of this study was to assess the efficacy of long-term resistance training in preventing the detrimental effects of muscle unloading on neuromuscular function. DESIGN: Eleven untrained men and 11 men with extensive backgrounds in resistance training were tested for several parameters of neuromuscular function at various isokinetic contractile velocities before and after 7 days of muscle unloading. Measurements included muscle mass, strength, power, total work, electromyography, and neuromuscular transmission efficiency using superimposed electrical stimulation of maximally contracting muscles...
January 17, 2017: American Journal of Physical Medicine & Rehabilitation
https://www.readbyqxmd.com/read/28099193/the-effect-of-peripheral-nerve-stimulation-on-shoulder-biomechanics-a-randomized-controlled-trial-in-comparison-to-physical-therapy
#3
Richard D Wilson, Jayme S Knutson, Maria E Bennett, John Chae
OBJECTIVE: To establish the effects on shoulder biomechanics from a peripheral nerve stimulation (PNS) treatment compared to physical therapy (PT) in stroke survivors with chronic hemiplegic shoulder pain. DESIGN: Single-site, pilot, randomized controlled trial for adults with chronic shoulder pain after stroke. Participants were randomized to receive a 3-week treatment of single-lead PNS or physical therapy (PT). The outcomes included isometric shoulder abduction strength, pain-free shoulder external rotation range of motion (ROM), delay in initiation and termination of shoulder abduction electromyogram (EMG) activity, and the Fugl-Meyer Motor Assessment (upper extremity section)...
January 17, 2017: American Journal of Physical Medicine & Rehabilitation
https://www.readbyqxmd.com/read/28096689/influence-of-exercise-on-visceral-pain-an-explorative-study-in-healthy-volunteers
#4
Laura Jgm van Weerdenburg, Christina Brock, Asbjørn Mohr Drewes, Harry van Goor, Marjan de Vries, Oliver Hg Wilder-Smith
BACKGROUND AND OBJECTIVES: Contradictory results have been found about the effect of different exercise modalities on pain. The aim of this study was to investigate the early effects of aerobic and isometric exercise on different types of experimental pain, including visceral pain, compared to an active control condition. METHODS: Fifteen healthy subjects (6 women, mean [standard deviation] age 25 [6.5] years) completed 3 interventions consisting of 20 minutes of aerobic cycling, 12 minutes of isometric knee extension and a deep breathing procedure as active control...
2017: Journal of Pain Research
https://www.readbyqxmd.com/read/28095747/effects-of-roller-massager-on-muscle-recovery-after-exercise-induced-muscle-damage
#5
Nuno Casanova, Joana F Reis, João R Vaz, Rita Machado, Bruno Mendes, Duane C Button, Pedro Pezarat-Correia, Sandro R Freitas
Two experiments (n = 10) were conducted to determine the effects of roller massager (RM) on ankle plantar flexor muscle recovery after exercise-induced muscle damage (EIMD). Experiment 1 examined both functional [i.e., ankle plantar flexion maximal isometric contraction and submaximal (30%) sustained force; ankle dorsiflexion maximal range of motion and resistance to stretch; and medial gastrocnemius pain pressure threshold] and morphological [cross-sectional area, thickness, fascicle length, and fascicle angle] variables, before and immediately, 1, 24, 48, and 72 h after an EIMD stimulus...
January 18, 2017: Journal of Sports Sciences
https://www.readbyqxmd.com/read/28095102/electromyographic-analysis-of-gluteus-maximus-and-hamstring-activity-during-the-supine-resisted-hip-extension-exercise-versus-supine-unilateral-bridge-to-neutral
#6
James W Youdas, James P Hartman, Brooke A Murphy, Ashley M Rundle, Jenna M Ugorowski, John H Hollman
Hip extension strengthening exercises which maximize gluteus maximus contributions and minimize hamstring influences may be beneficial for persons with hip pain. This study's aim was to compare muscle activation of the gluteus maximus and hamstrings from healthy subjects during a supine resisted hip extension exercise versus supine unilateral bridge to neutral. Surface electromyographic (EMG) signals were obtained from the right gluteus maximus and hamstrings in 13 healthy male and 13 healthy female subjects...
January 17, 2017: Physiotherapy Theory and Practice
https://www.readbyqxmd.com/read/28095094/female-age-related-differences-in-biomechanics-and-muscle-activity-during-descents-on-the-outstretched-arms
#7
Lauren Jane Lattimer, Joel Lanovaz, Jon Farthing, Stéphanie Madill, Soo Kim, Stephen Robinovitch, Cathy Arnold
The purposes of this study were to examine female age differences in: 1) upper extremity (UE) and trunk muscle activity, elbow joint moment, loading force and UE energy absorption during a controlled forward body descent and 2) UE muscle strength. Twenty young (mean 24.8±3.4 yrs.) and 20 older (68.4±5.7 yrs.) women were assessed via dynamometry for isometric, concentric and eccentric UE strength and performed forward descents on force plates at three body lean angles (60, 45, and 30° from horizontal). Significant differences (p < ...
January 17, 2017: Journal of Aging and Physical Activity
https://www.readbyqxmd.com/read/28093359/fmri-characterisation-of-widespread-brain-networks-relevant-for-behavioural-variability-in-fine-hand-motor-control-with-and-without-visual-feedback
#8
Stephen D Mayhew, Camillo Porcaro, Franca Tecchio, Andrew P Bagshaw
A bilateral visuo-parietal-motor network is responsible for fine control of hand movements. However, the sub-regions which are devoted to maintenance of contraction stability and how these processes fluctuate with trial-quality of task execution and in the presence/absence of visual feedback remains unclear. We addressed this by integrating behavioural and fMRI measurements during right-hand isometric compression of a compliant rubber bulb, at 10% and 30% of maximum voluntary contraction, both with and without visual feedback of the applied force...
January 13, 2017: NeuroImage
https://www.readbyqxmd.com/read/28092056/a-randomised-placebo-controlled-crossover-study-investigating-the-effects-of-nicotine-gum-on-strength-power-and-anaerobic-performance-in-nicotine-na%C3%A3-ve-active-males
#9
Toby Mündel, Marine Machal, Darryl J Cochrane, Matthew J Barnes
BACKGROUND: Nicotine use amongst athletes is high and increasing, especially team sports, yet the limited previous studies investigating the performance consequences of this behaviour have not examined the effects of the principal active ingredient, nicotine, per se. Therefore, we determined whether nicotine gum affected muscular and anaerobic performance. METHODS: Nine active males (24 ± 3 years) completed three trials in a random order in which 20 min prior to testing they chewed 2 mg (NIC-2), 4 mg (NIC-4) nicotine or flavour-matched placebo (PLA) gum...
December 2017: Sports Medicine—Open
https://www.readbyqxmd.com/read/28091708/the-effect-of-motor-overflow-on-bimanual-asymmetric-force-coordination
#10
David A Cunningham, Sarah M Roelle, Didier Allexandre, Kelsey A Potter-Baker, Vishwanath Sankarasubramanian, Jayme S Knutson, Guang H Yue, Andre G Machado, Ela B Plow
Motor overflow, typically described in the context of unimanual movements, refers to the natural tendency for a 'resting' limb to move during movement of the opposite limb and is thought to be influenced by inter-hemispheric interactions and intra-cortical networks within the 'resting' hemisphere. It is currently unknown, however, how motor overflow contributes to asymmetric force coordination task accuracy, referred to as bimanual interference, as there is need to generate unequal forces and corticospinal output for each limb...
January 16, 2017: Experimental Brain Research. Experimentelle Hirnforschung. Expérimentation Cérébrale
https://www.readbyqxmd.com/read/28090182/supervised-versus-home-exercise-training-programs-on-functional-balance-in-older-subjects
#11
Enas Fawzy Youssef, Alsayed Abd Elhameed Shanb
BACKGROUND: Aging is associated with a progressive decline in physical capabilities and a disturbance of both postural control and daily living activities. The aim of this study was to evaluate the effects of supervised versus home exercise programs on muscle strength, balance and functional activities in older participants. METHODS: Forty older participants were equally assigned to a supervised exercise program (group-I) or a home exercise program (group-II). Each participant performed the exercise program for 35-45 minutes, two times per week for four months...
November 2016: Malaysian Journal of Medical Sciences: MJMS
https://www.readbyqxmd.com/read/28090180/a-randomised-placebo-controlled-trial-of-neurodynamic-sliders-on-hamstring-responses-in-footballers-with-hamstring-tightness
#12
Pattanasin Areeudomwong, Ketsarakon Oatyimprai, Saranchana Pathumb
BACKGROUND: Neurodynamics intervention is known to increase apparent muscle extensibility, but information regarding hamstring responses after a neurodynamic sliders (NS) technique is scarce. The aim of this study was to evaluate the effects of NS on apparent hamstring extensibility and activity in footballers with hamstring tightness. METHODS: Forty eligible healthy male footballers with hamstring tightness were each randomly allocated to either a 4-week NS technique or a control group (CG) receiving placebo shortwave intervention...
November 2016: Malaysian Journal of Medical Sciences: MJMS
https://www.readbyqxmd.com/read/28089495/assessment-of-the-isometry-of-the-anterolateral-ligament-in-a-3-dimensional-weight-bearing-computed-tomography-simulation
#13
Karl Wieser, Philipp Fürnstahl, Fabio Carrillo, Sandro F Fucentese, Lazaros Vlachopoulos
PURPOSE: To simulate the most isometric insertion points of the anterolateral ligament (ALL) in a weight-bearing 3-dimensional computed tomography (CT) model using previously published anatomic landmarks and to define radiographic landmarks, which make for an easier identification of the optimal insertion points. METHODS: The most isometric femoral insertion points were analyzed for 10 individuals, using data of weight-bearing CT scans in increasing knee flexion positions...
January 12, 2017: Arthroscopy: the Journal of Arthroscopic & related Surgery
https://www.readbyqxmd.com/read/28089225/-effectiveness-of-an-individualised-physiotherapy-program-versus-group-therapy-on-neck-pain-and-disability-in-patients-with-acute-and-subacute-mechanical-neck-pain
#14
Leonardo Gregorio Antúnez Sánchez, María de la Casa Almeida, Jesús Rebollo Roldán, Antonio Ramírez Manzano, Rocío Martín Valero, Carmen Suárez Serrano
OBJECTIVE: To compare the efficacy in reducing neck pain and disability in an individualised physiotherapy treatment with group treatment in acute and subacute mechanical neck pain. DESIGN: Randomised clinical trial. LOCATION: Health Area of University Hospital Virgen del Rocío, Seville, Spain. PARTICIPANTS: A total of 90 patients diagnosed with mechanical neck pain of up to one month onset, distributed randomly into two groups: (i)individualised treatment; (ii)group treatment...
January 11, 2017: Atencion Primaria
https://www.readbyqxmd.com/read/28088661/reduced-cortical-voluntary-activation-during-bilateral-knee-extension
#15
Luc Girompaire, Baptiste Morel, Thomas Lapole
INTRODUCTION: Reduced neural drive is mainly thought to explain the bilateral deficit phenomenon, i.e. the difference in maximal isometric voluntary contraction (MVC) between unilateral and bilateral contractions. The aim of the present study was to further document if bilateral knee extension is associated with changes in voluntary activation level assessed by both peripheral nerve electrical stimulation and transcranial magnetic stimulation. METHODS: Fourteen subjects performed unilateral and bilateral knee extensions with both superimposed femoral electrical nerve stimulation and transcranial magnetic stimulation in order to assess voluntary activation (VAFNES) and cortical voluntary activation (VATMS), respectively...
January 12, 2017: Human Movement Science
https://www.readbyqxmd.com/read/28088014/reduced-complexity-of-force-and-muscle-activity-during-low-level-isometric-contractions-of-the-ankle-in-diabetic-individuals
#16
E Y Suda, P Madeleine, R P Hirata, A Samani, T T Kawamura, I C N Sacco
BACKGROUND: This study evaluated the structure and amount of variability of surface electromyography (sEMG) patterns and ankle force data during low-level isometric contractions in diabetic subjects with different degrees of neuropathy. METHODS: We assessed 10 control subjects and 38 diabetic patients, classified as absent, mild, moderate, or severe neuropathy, by a fuzzy system based on clinical variables. Multichannel sEMG (64-electrode matrix) of tibialis anterior and gastrocnemius medialis muscles were acquired during isometric contractions at 10%, 20%, and 30% of the maximum voluntary contraction, and force levels during dorsi- and plantarflexion were recorded...
January 4, 2017: Clinical Biomechanics
https://www.readbyqxmd.com/read/28079176/adductor-canal-block-versus-femoral-nerve-block-for-total-knee-arthroplasty-a-meta-analysis-of-randomized-controlled-trials
#17
Duan Wang, Yang Yang, Qi Li, Shen-Li Tang, Wei-Nan Zeng, Jin Xu, Tian-Hang Xie, Fu-Xing Pei, Liu Yang, Ling-Li Li, Zong-Ke Zhou
Femoral nerve blocks (FNB) can provide effective pain relief but result in quadriceps weakness with increased risk of falls following total knee arthroplasty (TKA). Adductor canal block (ACB) is a relatively new alternative providing pure sensory blockade with minimal effect on quadriceps strength. The meta-analysis was designed to evaluate whether ACB exhibited better outcomes with respect to quadriceps strength, pain control, ambulation ability, and complications. PubMed, Embase, Web of Science, Wan Fang, China National Knowledge Internet (CNKI) and the Cochrane Database were searched for RCTs comparing ACB with FNB after TKAs...
January 12, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28068846/impact-of-tamsulosin-and-nifedipine-on-contractility-of-pregnant-rat-ureters-in-vitro
#18
Lisette Haddad, Stéphanie Corriveau, Eric Rousseau, Simon Blouin, Jean-Charles Pasquier, Yves Ponsot, Marie-Ève Roy-Lacroix
OBJECTIVES: To evaluate the in vitro effect of tamsulosin and nifedipine on the contractility of pregnant rat ureters and to perform quantitative analysis of the pharmacological effects. Medical expulsive therapy (MET) is commonly used to treat urolithiasis. However, this treatment is seldom used in pregnant women since no studies support this practice. METHODS: This was an in vitro study on animal tissue derived from pregnant Sprague-Dawley rats. A total of 124 ureteral segments were mounted in an organ bath system and contractile response to methacholine (MCh) was assessed...
January 9, 2017: Journal of Maternal-fetal & Neonatal Medicine
https://www.readbyqxmd.com/read/28068727/comparison-of-muscle-recovery-following-bi-cruciate-substituting-versus-posterior-stabilized-total-knee-arthroplasty-in-the-asian-population
#19
Akihito Takubo, Keinosuke Ryu, Takanori Iriuchishima, Yasuaki Tokuhashi
The purpose of this study was to compare muscle recovery in the lower extremities following the newly developed bi-cruciate substituting (BCS) to posterior stabilized (PS) total knee arthroplasty (TKA) in the Asian population. Forty-one knees in 41 patients undergoing BCS-TKA (41 female, average age: 71 ± 8.8) and 34 knees in 34 patients undergoing PS-TKA (33 female, average age: 73 ± 7.2) were included in this study. The maximum isometric power of the quadriceps and hamstring muscles was measured preoperatively, and at 1, 3, 6, and 12 months after surgery using a handheld dynamometer...
January 9, 2017: Journal of Knee Surgery
https://www.readbyqxmd.com/read/28068520/impact-loading-following-quadriceps-strength-training-in-individuals-with-medial-knee-osteoarthritis-and-varus-alignment
#20
Crystal O Kean, Rana S Hinman, Tim V Wrigley, Boon-Whatt Lim, Kim L Bennell
BACKGROUND: Greater impact loading at initial contact is postulated to play a role in the progression of osteoarthritis. Quadriceps weakness is common in individuals with knee osteoarthritis and may contribute to high impact loading. The purpose of this study was to examine the effects of quadriceps strengthening on impact loading parameters. METHODS: Data from 97 individuals with knee osteoarthritis who participated in a randomized clinical trial examining effects of a 12-week quadriceps strengthening program was used to conduct this secondary exploratory analysis...
January 4, 2017: Clinical Biomechanics
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