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https://www.readbyqxmd.com/read/28530475/a-novel-electromyographic-approach-to-estimate-fatigue-threshold-in-maximum-incremental-strength-tests
#1
Jerónimo Aragón-Vela, Yaira Barranco-Ruiz, Cristina Casals, Julio Plaza-Díaz, Rafael A Casuso, Luis Fontana, Jesus R Huertas
Evaluation of muscular fatigue thresholds in athletes performing short-duration and explosive exercises is difficult due to the fact that classic parameters do not suffer large variations. Therefore, the aim of this study was to develop a new method to estimate the fatigue threshold in single muscles. Our approach is based on electromyographic data recorded during a maximun incremental strength test until the one repetition maximum (1RM) is reached. Ten men and ten women performed a half-squat strength test consisting of five incremental intensities of 1RM...
May 22, 2017: Motor Control
https://www.readbyqxmd.com/read/28529804/unilateral-discomfort-increases-the-use-of-contralateral-side-during-sit-to-stand-transfer
#2
Simisola O Oludare, Charlie C Ma, Alexander S Aruin
Individuals with unilateral impairment perform symmetrical movements asymmetrically. Restoring symmetry of movements is an important goal of rehabilitation. The aim of the study was to evaluate the effect of using discomfort-inducing devices on movement symmetry. Fifteen healthy individuals performed the sit-to-stand (STS) maneuver using devices inducing unilateral discomfort under the left sole and left thigh or right sole and right thigh and without them. 3D body kinematics, ground reaction forces, electrical activity of muscles, and the level of perceived discomfort were recorded...
2017: Rehabilitation Research and Practice
https://www.readbyqxmd.com/read/28526226/experimental-pain-in-the-groin-may-refer-into-the-lower-abdomen-implications-to-clinical-assessments
#3
M K Drew, T S Palsson, R P Hirata, M Izumi, G Lovell, M Welvaert, P Chiarelli, P G Osmotherly, T Graven-Nielsen
OBJECTIVES: To investigate the effects of experimental adductor pain on the pain referral pattern, mechanical sensitivity and muscle activity during common clinical tests. DESIGN: Repeated-measures design. METHODS: In two separate sessions, 15 healthy males received a hypertonic (painful) and isotonic (control) saline injection to either the adductor longus (AL) tendon to produce experimental groin pain or into the rectus femoris (RF) tendon as a painful control...
April 21, 2017: Journal of Science and Medicine in Sport
https://www.readbyqxmd.com/read/28514018/salvage-of-postcranioplasty-implant-exposure-using-free-tissue-transfer
#4
Pang-Yun Chou, Cheng-Hung Lin, Chung-Chen Hsu, Wei-Hsun Yang, Alex A Kane, Chih-Hung Lin
BACKGROUND: Refractory implant exposure is frustrating after cranioplasty. The purpose of this study was for the authors to present their experience with free tissue transfer for salvage of postcranioplasty implant exposure. METHODS: A retrospective medical chart review was conducted on all free tissue transfers performed for exposed implant coverage after cranioplasty between January 2004 and February 2016. RESULTS: Twelve free flaps were performed in 11 patients who underwent postcranioplasty with implant exposure, and whose attempted implant coverage using locoregional flaps had failed...
May 17, 2017: Head & Neck
https://www.readbyqxmd.com/read/28513880/unstable-rocker-shoes-promote-recovery-from-marathon-induced-muscle-damage-in-novice-runners
#5
Kento Nakagawa, Takayuki Inami, Takahisa Yonezu, Yuta Kenmotsu, Takaya Narita, Yasuo Kawakami, Kazuyuki Kanosue
We recently reported that wearing unstable rocker shoes (Masai Barefoot Technology: MBT) may enhance recovery from marathon race induced fatigue. However, this earlier study only utilized a questionnaire. In the present study, we evaluated MBT utilizing objective physiological measures of recovery from marathon induced muscle damages. Twenty-five university student novice runners were divided into two groups. After running a full marathon, one group wore MBT shoes (MBT group), and the control group (CON) wore ordinary shoes daily for one week following the race...
May 17, 2017: Scandinavian Journal of Medicine & Science in Sports
https://www.readbyqxmd.com/read/28513281/short-term-effects-of-kinesio-taping-on-muscle-recruitment-order-during-a-vertical-jump-a-pilot-study
#6
Guillermo Mendez-Rebolledo, Rodrigo Ramirez-Campillo, Eduardo Guzman-Muñoz, Valeska Gatica-Rojas, Alexis Dabanch-Santis, Francisco Diaz-Valenzuela
CONTEXT: Kinesio taping is commonly used in sports and rehabilitation settings with the aim of prevention and treatment of musculoskeletal injuries. However, limited evidence exists regarding the effects of 24 and 72 h of kinesio taping on trunk and lower limb neuromuscular and kinetic performance during a vertical jump. OBJECTIVE: The purpose of this study was to analyze the short-term effects of kinesio taping on the height and ground reaction force during a vertical jump, in addition to trunk and lower limb muscle latency and recruitment order...
May 17, 2017: Journal of Sport Rehabilitation
https://www.readbyqxmd.com/read/28512726/cutaneous-reflex-modulation-during-obstacle-avoidance-under-conditions-of-normal-and-degraded-visual-input
#7
Daniel S Marigold, Andrew J Chang, Kim Lajoie
The nervous system integrates visual input regarding obstacles with limb-based sensory feedback to allow an individual to safely negotiate the environment. This latter source can include cutaneous information from the foot, particularly in the event that limb trajectory is not sufficient and there is an unintended collision with the object. However, it is not clear the extent to which cutaneous reflexes are modified based on visual input. In this study, we first determined if phase-dependent modulation of these reflexes is present when stepping over an obstacle during overground walking...
May 16, 2017: Experimental Brain Research. Experimentelle Hirnforschung. Expérimentation Cérébrale
https://www.readbyqxmd.com/read/28505208/neuromuscular-function-of-the-quadriceps-muscle-during-isometric-maximal-submaximal-and-submaximal-fatiguing-voluntary-contractions-in-knee-osteoarthrosis-patients
#8
Anett Mau-Moeller, Robert Jacksteit, Mario Jackszis, Frank Feldhege, Matthias Weippert, Wolfram Mittelmeier, Rainer Bader, Ralf Skripitz, Martin Behrens
INTRODUCTION: Knee osteoarthrosis (KOA) is commonly associated with a dysfunction of the quadriceps muscle which contributes to alterations in motor performance. The underlying neuromuscular mechanisms of muscle dysfunction are not fully understood. The main objective of this study was to analyze how KOA affects neuromuscular function of the quadriceps muscle during different contraction intensities. MATERIALS AND METHODS: The following parameters were assessed in 20 patients and 20 healthy controls: (i) joint position sense, i...
2017: PloS One
https://www.readbyqxmd.com/read/28501988/gluteus-maximus-contraction-velocity-assessed-by-tensiomyography-improves-following-arthroscopic-treatment-of-femoroacetabular-impingement
#9
Roberto Seijas, Miguel Marín, Eila Rivera, Eduard Alentorn-Geli, David Barastegui, Pedro Álvarez-Díaz, Ramón Cugat
PURPOSE: Muscular impairment, particularly for the gluteus maximus (GM), has been observed in femoroacetabular impingement (FAI). The purpose of this study was to evaluate the tensiomyographic changes of the GM, rectus femoris (RF) and adductor longus (AL) before and after arthroscopic surgery for FAI. It was hypothesized that arthroscopic treatment of FAI would improve the preoperative muscular impairment. METHODS: All patients undergoing arthroscopic treatment of FAI between January and July 2015 were approached for eligibility...
May 13, 2017: Knee Surgery, Sports Traumatology, Arthroscopy: Official Journal of the ESSKA
https://www.readbyqxmd.com/read/28498546/the-use-of-inverted-l-posteromedial-thigh-l-pmt-flap-for-autologous-breast-reconstruction-a-case-report
#10
Mario F Scaglioni, Maximilian Eder, Pietro Giovanoli
The posteromedial thigh (PMT) flap has been described for breast reconstruction in vertical fashion (vPMT). However, it might not incorporate enough soft tissue for reconstruction of a medium size breast. Here, we present a case utilizing the free inverted-L posteromedial thigh (L-PMT) flap for autologous reconstruction of the breast. A 65-year-old woman with a body max index (BMI) of 24.5 kg/m(2) underwent nipple sparring mastectomy and received immediate unilateral breast reconstruction. The flap was raised based on the first medial perforator of the profunda femoris artery (PFA)...
May 12, 2017: Microsurgery
https://www.readbyqxmd.com/read/28488211/calf-augmentation-and-restoration-long-term-results-and-the-review-of-the-reported-complications
#11
Igor Niechajev, Christen Krag
BACKGROUND: Augmentation or reconstruction of the calves is indicated in patients with thin legs, for bodybuilders, or when there is a defect after an injury or illness. The principle of placing implants under the investing crural fascia was worked out in the 1980s. The senior author (I.N.) introduced many technical modifications and improvements for this operation, among them the new instrument, an inserter for the calf implants. Presented patient material is unique in that the more challenging reconstructive cases almost equal the numbers of the aesthetic cases...
May 9, 2017: Aesthetic Plastic Surgery
https://www.readbyqxmd.com/read/28487221/neurophysiological-insights-on-flexibility-improvements-through-motor-imagery
#12
Thiago Ferreira Dias Kanthack, Aymeric Guillot, Charalambos Papaxanthis, Théophile Guizard, Christian Collet, Franck Di Rienzo
The efficacy of motor imagery (MI) practice to facilitate muscle stretching remains controversial and the underlying neurophysiological mechanisms unexplored. We evaluated the effects of MI practice during a sit-and-reach task. Healthy participants were randomly assigned to a MI practice (n=15) or Control (n=15) group and completed 2 blocks of 5 sit-and-reach trials. During the first block (B1), participants performed 5 maximal stretching trials of 10s. During the second block (B2), trials were divided into two consecutive parts: i) reproducing the maximum performance of B1 (10s, B2 part 1), and ii) attempting to outperform the maximum performance of B1 (10s, B2 part 2)...
May 6, 2017: Behavioural Brain Research
https://www.readbyqxmd.com/read/28483469/spectral-properties-of-multiple-myoelectric-signals-new-insights-into-the-neural-origin-of-muscle-synergies
#13
Julien Frère
It is still unclear if muscle synergies reflect neural strategies or mirror the underlying mechanical constraints. Therefore, this study aimed to verify the consistency of muscle groupings between the synergies based on the linear envelope (LE) of muscle activities and those incorporating the time-frequency (TF) features of the electromyographic (EMG) signals. Twelve healthy participants performed six 20-m walking trials at a comfort and fast self-selected speed, while the activity of eleven lower limb muscles was recorded by means of surface EMG...
May 5, 2017: Neuroscience
https://www.readbyqxmd.com/read/28474107/-foot-drop-treatment-by-implantation-of-a%C3%A2-neuroprosthesis-actigait%C3%A2
#14
D Yao, E Jakubowitz, S Ettinger, C Plaass, C Stukenborg-Colsman, K Daniilidis
OBJECTIVE: Gait improvement by restoring dorsiflexion using a neuroprosthesis implant. INDICATIONS: Foot drop with damage to the 1st motor neuron; passive mobility in ankle is possible; adult patients. CONTRAINDICATIONS: Foot drop with peripheral damage and injury to the peroneal nerve; already implanted stimulators (e.g., defibrillator, pacemaker, or pain stimulator); severe anesthesia risks in multimorbid patients. SURGICAL TECHNIQUE: Surgery in lateral position...
May 4, 2017: Operative Orthopädie und Traumatologie
https://www.readbyqxmd.com/read/28464800/effect-of-tendon-vibration-during-wide-pulse-neuromuscular-electrical-stimulation-nmes-on-the-decline-and-recovery-of-muscle-force
#15
Vanesa Bochkezanian, Robert U Newton, Gabriel S Trajano, Amilton Vieira, Timothy S Pulverenti, Anthony J Blazevich
BACKGROUND: Neuromuscular electrical stimulation (NMES) is commonly used to activate skeletal muscles and reverse muscle atrophy in clinical populations. Clinical recommendations for NMES suggest the use of short pulse widths (100-200 μs) and low-to-moderate pulse frequencies (30-50 Hz). However, this type of NMES causes rapid muscle fatigue due to the (non-physiological) high stimulation intensities and non-orderly recruitment of motor units. The use of both wide pulse widths (1000 μs) and tendon vibration might optimize motor unit activation through spinal reflex pathways and thus delay the onset of muscle fatigue, increasing muscle force and mass...
May 2, 2017: BMC Neurology
https://www.readbyqxmd.com/read/28463899/acute-metabolic-response-energy-expenditure-and-emg-activity-in-sitting-and-standing
#16
Ying Gao, Mika Silvennoinen, Arto Pesola, Heikki Kainulainen, Neil J Cronin, Taija Finni
PURPOSE: While merely standing up interrupts sedentary behavior, it is important to study acute metabolic responses during single bouts of sitting and standing to understand the physiological processes affecting the health of office workers. METHODS: 18 healthy middle aged women aged 49.4 ± 7.9 years (range: 40 to 64) with a BMI of 23.4 ± 2.8 kg·m volunteered for this laboratory-based randomized crossover trial where they performed two hours desk work either in sitting or standing postures after overnight fasting...
May 2, 2017: Medicine and Science in Sports and Exercise
https://www.readbyqxmd.com/read/28459795/four-weeks-of-nordic-hamstring-exercise-reduce-muscle-injury-risk-factors-in-young-adults
#17
João Breno de A R Alvares, Vanessa Bernardes Marques, Marco Aurélio Vaz, Bruno Manfredini Baroni
The Nordic hamstring exercise (NHE) is a field-based exercise designed for knee-flexor eccentric strengthening, aimed at muscle strains prevention. However, possible effects of NHE programmes on other hamstring injury risk factors remain unclear. The purpose of this study was to investigate the effects of a NHE training programme on multiple hamstring injury risk factors. Twenty physically active young adults were allocated into two equal sized groups: control group (CG) and training group (TG). The TG was engaged in a 4-week NHE programme, twice a week, 3 sets of 6-10 repetitions; while CG received no exercise intervention...
April 26, 2017: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/28448712/-quadratus-femoris-muscle-tear
#18
L G Domínguez-Gasca, J L Alcocer-Maldonado, J Magaña-Reyes, L G Domínguez-Carrillo
BACKGROUND: Quadratus femoris tear is an uncommon injury that usually cause hip pain, it incidence is unknown. The patient can suffer of posterior gluteal pain or groin pain or both, which makes accurate diagnosis difficult, because the differential diagnosis of hip pain is broad. CLINICAL CASE: A 65 years old male, with gluteal and groin pain presented during tennis; evaluated by neurologist with lumbosacral magnetic resonance imaging (MRI) (normal) and referred to physical therapy, a pelvic MRI was required, finding an unsuspected quadratus femoris tear...
September 2016: Acta Ortopédica Mexicana
https://www.readbyqxmd.com/read/28447184/electromyographic-evaluation-of-high-intensity-elastic-resistance-exercises-for-lower-extremity-muscles-during-bed-rest
#19
Jonas Vinstrup, Sebastian Skals, Joaquin Calatayud, Markus Due Jakobsen, Emil Sundstrup, Matheus Daros Pinto, Mikel Izquierdo, Yuling Wang, Mette K Zebis, Lars Louis Andersen
PURPOSE: Prolonged hospital bed rest after severe injury or disease leads to rapid muscle atrophy and strength loss. Therefore, the main aim of this study was to evaluate the efficacy of lower extremity strengthening exercises using elastic resistance that can be performed while lying in a hospital bed. METHODS: Using a cross-sectional design, 22 healthy individuals performed three consecutive repetitions of 14 different lower extremity exercises using elastic resistance, with a perceived intensity corresponding to 8 on the Borg CR-10 scale...
April 26, 2017: European Journal of Applied Physiology
https://www.readbyqxmd.com/read/28445224/impact-of-6-consecutive-days-of-sprint-training-in-hypoxia-on-performance-in-competitive-sprint-runners
#20
Nobukazu Kasai, Sahiro Mizuno, Sayuri Ishimoto, Etsuko Sakamoto, Misato Maruta, Toshiyuki Kurihara, Yuko Kurosawa, Kazushige Goto
The purpose of the present study was to determine the effects of 6 successive days of repeated sprint training in moderate hypoxia on anaerobic capacity in 100-200-m sprint runners. Eighteen male sprint runners (age, 20.0 ± 0.3 years; height, 175.9 ± 1.1 cm; body mass, 65.0 ± 1.2 kg) performed repeated cycling sprints for 6 consecutive days in either normoxic (NOR; fraction of inspired oxygen [FiO2], 20.9%; n = 9) or hypoxic conditions (HYPO; FiO2, 14.5%; n = 9). The repeated sprint ability (10 × 6-s sprints), 30-s maximal sprint ability, maximal oxygen uptake (VO2max), and 60-m running time on the track were measured before and after the training period...
April 18, 2017: Journal of Strength and Conditioning Research
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