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https://www.readbyqxmd.com/read/29774307/bethlem-myopathy-in-a-portuguese-patient-case-report
#1
Ana Inês Martins, Cristin Maarque, Jorge Pinto-Basto, Luis Negrão
Mutations of the encoding genes of collagen VI (COL6A1, COL6A2 and COL6A3 ), are responsible for two classical phenotypes (with a wide range of severity), the Ullrich congenital muscular dystrophy (UCMD) and the Bethlem myopathy (BM). We present a male patient of 49 years old, with symptoms of muscle weakness beginning in childhood and of very slowly progression. At the age of 42, the neurological examination revealed proximal lower limb muscle weakness and contractures of fingers flexors muscles, positive Gowers manoeuvre and a waddling gait...
September 2017: Acta Myologica: Myopathies and Cardiomyopathies: Official Journal of the Mediterranean Society of Myology
https://www.readbyqxmd.com/read/29772741/changes-in-lumbopelvic-movement-and-muscle-recruitment-associated-with-prolonged-deep-squatting-a-pilot-study
#2
Tim K S Lui, Sharon M H Tsang, Anthony W L Kwok
This study examined the changes in spinal kinematics and muscle recruitment of the lumbopelvic region associated with prolonged squatting. Eight subjects with chronic nonspecific low back pain (LBP) and eight asymptomatic subjects (AS) performed squat-to-stand and reverse movements, before and immediately after 15 min deep-squatting. Within-group and between-group differences in lumbopelvic kinematics and electromyographic activity acquired in lumbar erector spinae (ES), gluteus maximus (GM), and vastus lateralis (VL) were analyzed...
May 16, 2018: International Journal of Environmental Research and Public Health
https://www.readbyqxmd.com/read/29770501/correlation-between-cycling-power-and-muscle-thickness-in-cyclists
#3
Hyung-Jin Lee, Kang-Woo Lee, Yong-Woo Lee, Hee-Jin Kim
INTRODUCTION: The aim of this study was to determine the correlation between muscle thickness (MT) and cycling power in varsity cyclists using ultrasonography (US) and to identify any differences in MT between short- and long-distance cyclists. MATERIALS AND METHODS: Twelve cyclists participated in this study. Real-time two-dimensional B-mode US was used to measure the MT in the anterior thigh, anterior lower leg, and trunk, especially in the abdominal and lumbar regions...
May 17, 2018: Clinical Anatomy
https://www.readbyqxmd.com/read/29769821/validity-and-reliability-of-surface-electromyography-measurements-from-a-wearable-athlete-performance-system
#4
Scott K Lynn, Casey M Watkins, Megan A Wong, Katherine Balfany, Daniel F Feeney
The Athos ® wearable system integrates surface electromyography (sEMG ) electrodes into the construction of compression athletic apparel. The Athos system reduces the complexity and increases the portability of collecting EMG data and provides processed data to the end user. The objective of the study was to determine the reliability and validity of Athos as compared with a research grade sEMG system. Twelve healthy subjects performed 7 trials on separate days (1 baseline trial and 6 repeated trials). In each trial subjects wore the wearable sEMG system and had a research grade sEMG system's electrodes placed just distal on the same muscle, as close as possible to the wearable system's electrodes...
June 2018: Journal of Sports Science & Medicine
https://www.readbyqxmd.com/read/29768096/lower-extremity-muscle-function-of-front-row-rugby-union-scrummaging
#5
Mostafa Yaghoubi, Sally D Lark, Wyatt H Page, Philip W Fink, Sarah P Shultz
A rugby scrum's front row must act uniformly to transfer maximal horizontal force and improve performance. This study investigated the muscle activation patterns of lower extremity muscles in front row forwards during live and machine scrums at professional and amateur levels. Electromyography was collected bilaterally on vastus lateralis, rectus femoris and gastrocnemius muscles of 75 male rugby prop players during live and machine scrums. ANOVAs compared muscle reaction time, rate of change in muscle amplitude and muscle amplitude between groups and conditions...
May 16, 2018: Sports Biomechanics
https://www.readbyqxmd.com/read/29761654/low-load-resistance-exercise-during-inactivity-is-associated-with-greater-fibre-area-and-satellite-cell-expression-in-older-skeletal-muscle
#6
Daniel R Moore, Ryan P Kelly, Michaela C Devries, Tyler A Churchward-Venne, Stuart M Phillips, Gianni Parise, Adam P Johnston
BACKGROUND: Age-related sarcopenia is accelerated by physical inactivity. Low-load resistance exercise (LLRE) counters inactivity-induced muscle atrophy in older adults, but changes in muscle fibre morphology are unstudied. We aimed to determine the impact of LLRE during short-term inactivity (step-reduction) on muscle fibre size and capillarity as well as satellite cell (SC) content in older skeletal muscle. METHODS: Fourteen older (~71 years) male adults underwent 14 days of step reduction (<1500 steps/day) while performing six sessions of LLRE (~30% maximal strength) with one leg (SR + EX) while the contralateral leg served as an untrained control (SR)...
May 14, 2018: Journal of Cachexia, Sarcopenia and Muscle
https://www.readbyqxmd.com/read/29758055/active-recovery-affects-the-recovery-of-the-corticospinal-system-but-not-of-muscle-contractile-properties
#7
Louis-Solal Giboin, Ehsan Amiri, Raphael Bertschinger, Markus Gruber
PURPOSE: Active recovery is often used by athletes after strenuous exercise or competition but its underlying mechanisms are not well understood. We hypothesized that active recovery speeds-up recovery processes within the muscle and the central nervous system (CNS). METHODS: We assessed muscular and CNS recovery by measuring the voluntary activation (VA) in the vastus lateralis muscle with transcranial magnetic stimulation (VATMS) and peripheral nerve stimulation (VAPNS) during maximal voluntary contractions (MVC) of the knee extensors in 11 subjects...
2018: PloS One
https://www.readbyqxmd.com/read/29745773/muscle-oxygenation-rather-than-vo-2-max-is-a-strong-predictor-of-performance-in-sprint-canoe-kayak
#8
Myriam Paquette, François Bieuzen, François Billaut
PURPOSE: This study aimed to characterize the relationships between muscle oxygenation and performance during on- and off-water tests in highly trained sprint canoe-kayak athletes. METHODS: Thirty athletes (19 kayakers and 11 canoeists) performed a maximal incremental test on a canoe or kayak ergometer for determination of VO2max and examination of the relation between peak power output (PPO) and physiological parameters. A subset of 21 athletes also performed a 200-m and a 500-m (for women) or 1000-m (for men) on-water time trials...
May 10, 2018: International Journal of Sports Physiology and Performance
https://www.readbyqxmd.com/read/29745735/time-trial-performance-in-elite-speed-skaters-after-remote-ischemic-preconditioning
#9
Philippe Richard, François Billaut
PURPOSE: Speed skating leads to blood-flow restriction and deoxygenation in the lower limbs (especially the right leg) that may affect performance. Although the acute influence of such deoxygenation is not clearly understood, we tested whether remote ischemic preconditioning (RIPC) could modify muscular oxygenation and improve time-trial performance in that sport. METHODS: Using a randomized, single-blind, placebo-controlled, crossover design, 9 elite speed skaters performed 1000-m on-ice time-trials preceded by either RIPC of the upper limbs (3x5-min compression/5-min reperfusion cycles at 30 mmHg > arterial systolic pressure) or SHAM (10 mmHg)...
May 10, 2018: International Journal of Sports Physiology and Performance
https://www.readbyqxmd.com/read/29727016/metabolic-stress-dependent-regulation-of-the-mitochondrial-biogenic-molecular-response-to-high-intensity-exercise-in-human-skeletal-muscle
#10
M Fiorenza, T P Gunnarsson, M Hostrup, F M Iaia, F Schena, H Pilegaard, J Bangsbo
KEY POINTS: Low-volume high-intensity exercise training promotes muscle mitochondrial adaptations that resemble the ones associated with high-volume moderate-intensity exercise training. These training-induced mitochondrial adaptations stem from the cumulative effects of transient transcriptional responses to each acute exercise bout. However, whether metabolic stress is a key mediator of the acute molecular responses to high-intensity exercise is still incompletely understood. Herein we show that, by comparing different work-matched low-volume high-intensity exercise protocols, more marked metabolic perturbations were associated with enhanced mitochondrial biogenesis-related muscle mRNA responses...
May 4, 2018: Journal of Physiology
https://www.readbyqxmd.com/read/29722622/blood-flow-occlusion-related-o-2-extraction-reserve-is-present-in-different-muscles-of-the-quadriceps-but-greater-in-deeper-regions-after-ramp-incremental-test
#11
Danilo Iannetta, Dai Okushima, Erin Calaine Inglis, Narihiko Kondo, Juan M Murias, Shunsaku Koga
It was recently demonstrated that an O2 extraction reserve, as assessed by the near-infrared spectroscopy (NIRS)-derived deoxygenation signal ([HHb]), exists in the superficial region of vastus lateralis (VL) muscle during an occlusion performed at the end of a ramp-incremental test. However, it is unknown whether this reserve is present and/or different in magnitude in other portions and depths of the quadriceps muscles. We tested the hypothesis that O2 extraction would exist in other regions of this muscle but greater in deep compared to more superficial portions...
May 3, 2018: Journal of Applied Physiology
https://www.readbyqxmd.com/read/29708284/supersonic-shear-imaging-elastography-in-skeletal-muscles-relationship-between-in-vivo-and-synthetic-fiber-angles-and-shear-modulus
#12
Kelly Lima, Remi Rouffaud, Wagner Pereira, Liliam F Oliveira
OBJECTIVES: To verify a relationship between the pennation angle of synthetic fibers and muscle fibers with the shear modulus (μ) generated by Supersonic shear imaging (SSI) elastography and to compare the anisotropy of synthetic and in vivo pennate muscle fibers in the x2 -x3 plane (probe perpendicular to water surface or skin). METHODS: First, the probe of Aixplorer ultrasound scanner (v.9, Supersonic Imagine, Aix-en-Provence, France) was placed in 2 positions (parallel [aligned] and transverse to the fibers) to test the anisotropy in the x2 -x3 plane...
April 30, 2018: Journal of Ultrasound in Medicine: Official Journal of the American Institute of Ultrasound in Medicine
https://www.readbyqxmd.com/read/29707959/acute-changes-in-muscle-thickness-and-pennation-angle-in-response-to-work-matched-concentric-and-eccentric-isokinetic-exercise
#13
Amilton Vieira, Anthony J Blazevich, Nuno Frade de Sousa, Rodrigo Celes, Savio Alex, James J Tufano, Martim Bottaro
Acute changes in muscle architecture influenced by muscle swelling might be associated with chronic adaptations to resistance exercise, including skeletal muscle growth. Concentric (CON) and eccentric (ECC) muscle actions both play a role in hypertrophic processes, but the influence of each on acute indices of muscle swelling [i.e. muscle thickness (MT) and pennation angle PA)] remain relatively unknown. Therefore, this study compared the acute changes in MT and PA in response to work-matched CON versus ECC isokinetic exercise...
April 30, 2018: Applied Physiology, Nutrition, and Metabolism, Physiologie Appliquée, Nutrition et Métabolisme
https://www.readbyqxmd.com/read/29706723/electromyographic-activity-of-selected-trunk-core-and-thigh-muscles-in-commonly-used-exercises-for-acl-rehabilitation
#14
Omid A Khaiyat, Jessica Norris
[Purpose] Most of rehabilitation programmes for Anterior Cruciate Ligament (ACL) injury focus on quadriceps-hamstrings activation imbalances and less is known about kinetically linked muscles. This study investigated electromyographic activity of selected trunk, core, and thigh muscles during common rehabilitation exercises for ACL injury. [Subjects and Methods] Twelve active female volunteers participated in this cross-sectional laboratory study. Surface EMG was used to compare activation of eight trunk, hip/core, and lower limb muscles: Erector Spinae (ES), Rectus Abdominis (RA), Gluteus Maximus (GM), Vastus Lateralis (VL), Rectus Femoris (RF), Vastus Medialis (VM), Biceps Femoris (BF), and Semitendinosus (ST) during Forward Lunge, Double Leg Raise, Glute Bridge, Sit-Up, and Squat...
April 2018: Journal of Physical Therapy Science
https://www.readbyqxmd.com/read/29706719/effects-of-pelvic-range-of-motion-and-lower-limb-muscle-activation-pattern-on-over-ground-and-treadmill-walking-at-the-identical-speed-in-healthy-adults
#15
Seung-Yeop Lim, Wan-Hee Lee
[Purpose] Many studies have compared over-ground and treadmill walking, but the biomechanical relationship between the two gait modes is unclear. The aim of this study was to analyze differences in pelvic range of motion and lower limb muscles activity during over-ground and treadmill walking in healthy adults. Moreover, we aimed to analyze differences according to gender. [Subjects and Methods] Twenty-three healthy adults (9 men, 14 women) between 25 and 35 years of age walked at the identical speed for 30 seconds each in two difference gait modes...
April 2018: Journal of Physical Therapy Science
https://www.readbyqxmd.com/read/29706702/does-the-relative-muscle-activation-of-the-vastus-medialis-rectus-femoris-and-vastus-lateralis-during-the-various-activities-change-in-relation-to-the-quadriceps-angle
#16
Nakyung Lee
[Purpose] The purpose of this study was to examine the correlation between the quadriceps angle and muscle-activation ratios for the vastus medialis, rectus femoris, and vastus lateralis during various activities. [Subjects and Methods] Seventeen heathy females were recruited. The quadriceps angles were measured with long-arm goniometers. The muscle activity of the vastus medialis, rectus femoris, and vastus lateralis were measured using electromyography under four different activity settings: walking, squatting, step-up, and sit-to-stand...
April 2018: Journal of Physical Therapy Science
https://www.readbyqxmd.com/read/29703223/comparison-of-exercise-intensity-during-four-early-rehabilitation-techniques-in-sedated-and-ventilated-patients-in-icu-a-randomised-cross-over-trial
#17
Clément Medrinal, Yann Combret, Guillaume Prieur, Aurora Robledo Quesada, Tristan Bonnevie, Francis Edouard Gravier, Elise Dupuis Lozeron, Eric Frenoy, Olivier Contal, Bouchra Lamia
BACKGROUND: In the ICU, out-of-bed rehabilitation is often delayed and in-bed exercises are generally low-intensity. Since the majority of rehabilitation is carried out in bed, it is essential to carry out the exercises that have the highest intensity. The aim of this study was to compare the physiological effects of four common types of bed exercise in intubated, sedated patients confined to bed in the ICU, in order to determine which was the most intensive. METHODS: A randomised, single-blind, placebo-controlled crossover trial was carried out to evaluate the effects of four bed exercises (passive range of movements (PROM), passive cycle-ergometry, quadriceps electrical stimulation and functional electrical stimulation (FES) cycling) on cardiac output...
April 27, 2018: Critical Care: the Official Journal of the Critical Care Forum
https://www.readbyqxmd.com/read/29700758/assessing-sarcopenia-with-vastus-lateralis-muscle-ultrasound-an-operative-protocol
#18
Andrea Ticinesi, Marco V Narici, Fulvio Lauretani, Antonio Nouvenne, Elena Colizzi, Marco Mantovani, Andrea Corsonello, Francesco Landi, Tiziana Meschi, Marcello Maggio
BACKGROUND: Muscle ultrasound (MUS) has so far not been implemented for sarcopenia assessment in clinical geriatric practice due to allegedly low reproducibility of results in the absence of standardization of procedures. However, rigorous and standardized application of this technique yields highly reproducible results. Its application, especially if integrated with clinical evaluation and comprehensive geriatric assessment, proofs very useful for rapidly obtaining information on muscle mass and architecture...
April 26, 2018: Aging Clinical and Experimental Research
https://www.readbyqxmd.com/read/29699865/color-coded-digital-subtraction-angiography-for-assessing-acute-skeletal-muscle-ischemia-reperfusion-injury-in-a-rabbit-model
#19
Yan Zhang, Chengzhi Li, Hong Zhang, Wanghai Li, Jinwei Li, Xiaobai Wang
RATIONALE AND OBJECTIVES: This paper describes an ongoing investigation of imaging and characterization of ischemia-reperfusion (IR) and investigated the use of color-coded digital subtraction angiography (DSA) to assess reperfusion injury or potential injury. METHODS: New Zealand white rabbits were subjected to right hindlimb ischemia (IR, n = 24) or sham operation (control, n = 6). After 3 hours, the IR rabbits underwent reperfusion and were assessed at 0, 6, 12, or 24 hours (n = 6 each)...
April 23, 2018: Academic Radiology
https://www.readbyqxmd.com/read/29696675/anodal-and-cathodal-transcranial-direct-current-stimulation-can-decrease-force-output-of-knee-extensors-during-an-intermittent-mvc-fatiguing-task-in-young-healthy-male-participants
#20
Louis-Solal Giboin, Markus Gruber
Transcranial direct current stimulation (tDCS) has the capacity to enhance force output during a short-lasting maximal voluntary contraction (MVC) as well as during a long-lasting submaximal voluntary contraction until task failure. However, its effect on an intermittent maximal effort is not known. We hypothesized that anodal tDCS applied during or before a maximal fatigue task increases the amplitude of maximal voluntary contraction (aMVC) and voluntary activation (VA) in young healthy male participants. We measured VA, potentiated twitch at rest (Ptw), root mean square electromyogram (EMG), and aMVC during a fatiguing task that consisted of 35 × 5 s MVC of knee extensors and was performed during tDCS or 10 min after the end of tDCS (sham, anodal, or cathodal treatments)...
April 26, 2018: Journal of Neuroscience Research
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