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https://www.readbyqxmd.com/read/28644193/heel-raised-foot-posture-do-not-affect-trunk-and-lower-extremity-biomechanics-during-a-barbell-back-squat-in-recreational-weightlifters
#1
Szu-Ping Lee, Carrie Gillis, Javier J Ibarra, Derek Oldroyd, Ryan Zane
It is claimed that weightlifting shoes with a raised heel may lead to a more upright trunk posture, and thus reduce the risk of back injuries during a barbell back squat. These proclaimed biomechanical effects have not been thoroughly investigated. The purpose of this study was to compare trunk and lower extremity biomechanics during barbell back squats in 3 foot postures.14 recreational weightlifters (7 male and 7 female) between the ages of 18-50 performed barbell back squats in 3 conditions (barefoot on a flat surface, barefoot on a heel-raised platform, and wearing heel-raised weightlifting shoes) at 80% of their 1-RM...
June 19, 2017: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/28637659/enduring-effects-of-perinatal-nicotine-exposure-on-murine-sleep-in-adulthood
#2
Jeremy Charles Borniger, Reuben F Don, Ning Zhang, Robert Thomas Boyd, Randy J Nelson
The long-term consequences of early life nicotine exposure are poorly defined. Approximately 8-10% of women report smoking during pregnancy, and this may promote aberrant development in the offspring. To this end, we investigated potential enduring effects of perinatal nicotine exposure on murine sleep and affective behaviors in adulthood (~13-15 weeks of age) in C57Bl6j mice. Mothers received a water bottle containing 200 µg/ml nicotine bitartrate dihydrate in 2% w/v saccharin or pH-matched 2% saccharin with 0...
June 21, 2017: American Journal of Physiology. Regulatory, Integrative and Comparative Physiology
https://www.readbyqxmd.com/read/28628750/ergonomic-benefits-from-a-laparoscopic-instrument-with-rotatable-handle-piece-depend-on-the-area-of-the-operating-field-and-working-height
#3
Benjamin Steinhilber, Florian Reiff, Robert Seibt, Monika A Rieger, Peter Martus, Bernhard Kraemer, Ralf Rothmund
Objective To evaluate the effect of a laparoscopic instrument with a 360° rotatable handle piece (rot-HP) on biomechanical stress and precision in different areas of a simulated operating field at two working heights. Background Surgeons performing laparoscopic procedures are exposed to biomechanical stress and have an increased risk of musculoskeletal complaints. Method Fifty-seven healthy subjects (27 men, median age 26) without experience in laparoscopy performed a precision task in four quadrants (A-D) of the operating field using the rot-HP or a common fixed handle piece (fixed-HP) at an individually adjusted lower or higher working height...
June 1, 2017: Human Factors
https://www.readbyqxmd.com/read/28627507/semivertical-incision-an-aesthetically-and-electrophysiologically-effective-mini-incision-technique-for-carpal-tunnel-decompression
#4
Nese Keser, Nimet Dortcan, Ulas Cikla, Kutluay Uluc, Erhan Celikoglu, Merih Is, Bora Gurer
BACKGROUND The purpose of this study was to present the clinical results of our retrospective series of carpal tunnel release (CTR) operations. For these operations we used a unique type of incision, for the first time, for treatment of carpal tunnel syndrome (CTS) consisting of a 1-cm semi-vertical (SV) incision made into the wrist crease for macroscopic open CTR. MATERIAL AND METHODS This retrospective study included 114 patients (101 females and 13 males) with CTR who were operated upon in our neurosurgery clinic between December 2010 and June 2015...
June 19, 2017: Medical Science Monitor: International Medical Journal of Experimental and Clinical Research
https://www.readbyqxmd.com/read/28623713/indirect-sinusoidal-vibrations-induces-an-acute-increase-in-explosive-strength
#5
Leandro V de Paula, Pedro V S Moreira, Rudolf Huebner, Leszek A Szmuchrowski
The purpose of this study was to examine the acute effect of indirect vibration on neuromuscular responses and fatigue resistance (electromyographic activity - EMG and force) during isometric exercise. Nineteen healthy men (age=22.4±2.7years; body mass=76.4±12.9kg, height=175±6.7cm) performed isometric elbow flexion exercises in three experimental treatments: only isometric exercise (control - CON); isometric exercise with the addition of sinusoidal vibrations (SVE1; frequency=20Hz, displacement=3.55±0...
August 2017: Journal of Electromyography and Kinesiology
https://www.readbyqxmd.com/read/28611677/greater-neural-adaptations-following-high-vs-low-load-resistance-training
#6
Nathaniel D M Jenkins, Amelia A Miramonti, Ethan C Hill, Cory M Smith, Kristen C Cochrane-Snyman, Terry J Housh, Joel T Cramer
We examined the neuromuscular adaptations following 3 and 6 weeks of 80 vs. 30% one repetition maximum (1RM) resistance training to failure in the leg extensors. Twenty-six men (age = 23.1 ± 4.7 years) were randomly assigned to a high- (80% 1RM; n = 13) or low-load (30% 1RM; n = 13) resistance training group and completed leg extension resistance training to failure 3 times per week for 6 weeks. Testing was completed at baseline, 3, and 6 weeks of training. During each testing session, ultrasound muscle thickness and echo intensity, 1RM strength, maximal voluntary isometric contraction (MVIC) strength, and contractile properties of the quadriceps femoris were measured...
2017: Frontiers in Physiology
https://www.readbyqxmd.com/read/28608860/sensitivity-and-specificity-of-multichannel-surface-electromyography-in-diagnosing-fecal-incontinence
#7
Michał Nowakowski, Krzysztof A Tomaszewski, Łukasz Machura, Paulina Trybek, Roman M Herman
BACKGROUND: Assessment of the neurocontrol of the external anal sphincter has long been restricted to investigating patients by invasive tools. Less invasive techniques have been regarded less suitable for diagnosis. OBJECTIVE: The aim was to develop a surface electromyography-based algorithm to facilitate fecal incontinence diagnosis, and to assess its sensitivity and specificity. DESIGN: Data analysis from a single center prospective study...
2017: Folia Medica Cracoviensia
https://www.readbyqxmd.com/read/28602631/clinical-electrodiagnostic-and-outcome-correlation-in-als-patients-in-thailand
#8
Kongkiat Kulkantrakorn, Dararat Suksasunee
INTRODUCTION: The diagnosis of amyotrophic lateral sclerosis (ALS) requires both clinical and electrodiagnostic (EDx) data. The correlation between the two may aid in outcome prognostication. METHODS: Retrospective review of patients with ALS in tow tertiary hospitals in Thailand. RESULTS: Data from 25 ALS patients out of 38 patients with motor neuron disease was reviewed. Male was predominant with mean age of onset of 60.1±10.7years old...
June 8, 2017: Journal of Clinical Neuroscience: Official Journal of the Neurosurgical Society of Australasia
https://www.readbyqxmd.com/read/28598910/power-training-induced-increases-in-muscle-activation-during-gait-in-old-adults
#9
Chantal M I Beijersbergen, Urs Granacher, Martijn Gäbler, Paul DeVita, Tibor Hortobágyi
INTRODUCTION/PURPOSE: Aging modifies neuromuscular activation of agonist and antagonist muscles during walking. Power training can evoke adaptations in neuromuscular activation that underlie gains in muscle strength and power but it is unknown if these adaptations transfer to dynamic tasks such as walking. We examined the effects of lower extremity power training on neuromuscular activation during level gait in old adults. METHODS: Twelve community dwelling old adults (age ≥ 65 years) completed a 10-week lower extremity power-training program and thirteen old adults completed a 10-week control period...
June 7, 2017: Medicine and Science in Sports and Exercise
https://www.readbyqxmd.com/read/28593096/emg-of-shoulder-muscles-during-reactive-isometric-elastic-resistance-exercises
#10
Michael J Mullaney, Christine Perkinson, Ian Kremenic, Timothy F Tyler, Karl Orishimo, Christopher Johnson
BACKGROUND: Traditionally, shoulder isometrics are introduced in the early stages of shoulder rehabilitation. A patient's isometric torque output is based on a subjective perception of force generation. By utilizing elastic resistance elongation (strain) to standardize force output, clinicians could prescribe shoulder therapeutic isometrics based on % maximum voluntary contraction (%MVC). PURPOSE/HYPOTHESIS: The purpose of this study was to measure electromyographic (EMG) activity and determine the %MVC during shoulder flexion, external rotation and abduction isometrics at varying lengths of TheraBand® elastic resistance...
June 2017: International Journal of Sports Physical Therapy
https://www.readbyqxmd.com/read/28582456/detailed-spatial-characterization-of-superficial-hip-muscle-activation-during-walking-a-multi-electrode-surface-emg-investigation-of-the-gluteal-region-in-healthy-older-adults
#11
Christoph Anders, Steffen Patenge, Klaus Sander, Frank Layher, Uta Biedermann, Raimund W Kinne
PURPOSE: A multi-electrode array was used to generate spatially resolved Surface electromyography (SEMG) data of the hip muscles in healthy older adults. The cohort was meant to serve as an age-matched, normal control population for future surgical and rehabilitative studies in patients undergoing total hip arthroplasty, in view of the large, continuously increasing number of hip joint replacements. METHODS: Bilateral hip muscle SEMG activity, including tensor fasciae latae (TFL), gluteus medius (Gmed), and gluteus maximus (Gmax), was measured during locomotion on a walkway at self-selected slow, normal, and fast walking speeds (age-matched cohort of 29 females and 25 males)...
2017: PloS One
https://www.readbyqxmd.com/read/28579089/muscle-strength-and-force-development-in-high-and-low-functioning-elderly-men-influence-of-muscular-and-neural-factors
#12
Charlotte H Pion, Sébastien Barbat-Artigas, Félix St-Jean-Pelletier, Stéphanie Chevalier, Pierrette Gaudreau, Gilles Gouspillou, José A Morais, Marc Bélanger, Mylène Aubertin-Leheudre
BACKGROUND: Aging leads to a loss of muscle strength and functional capacity likely resulting from a combination of neural and muscle alterations. The aim of this study was to identify possible disparities in muscle strength and force development profiles in high- and low-functioning elderly men and to investigate muscular and neurophysiological factors that could explain the differences. METHODS: Sixty community-dwelling men in good general health were divided in two groups based on a functional capacity (FC) z-score derived from 6 tests of the Short Physical Performance Battery and Senior Fitness Test (Normal and fast 4m-walk tests, normal and fast Timed-up and go, chair and stair tests)...
June 1, 2017: Experimental Gerontology
https://www.readbyqxmd.com/read/28557850/compensatory-muscle-activation-during-unstable-overhead-squat-using-a-water-filled-training-tube
#13
Stephen C Glass, Robert W Albert
The purpose of this study was to assess compensatory muscle activation of core and support muscle during an overhead squat using a water-filled training tube. Eleven experienced weight lifting (age= 20.10 ± 0.99, mass 89.17 ± 6.88kg) men completed three, 30s trials of an overhead squat using an 11.4 kg tube that was partially filled with water. A central valve allowed three conditions of water movement: 50% open, 100% open, and a stable(S), closed valve condition. Subjects completed 8-10 repetitions within each condition...
May 23, 2017: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/28557394/-age-related-changes-of-peripheral-nerve-system-and-muscles-of-the-limbs-in-healthy-persons
#14
V B Voitenkov, V N Komancev, N V Skripchenko, S G Grigoryev, A V Klimkin, A I Aksenova
Our aim was to present and analyze age-related changes of peripheral nerves and muscles of limbs on a huge population of healthy persons of different ages. Persons aged from 2 months to 87 years were studied by conduction studies (EMG) during the period 2009-2016 years in Scientific Research Institute of Children's Infection. Data of those 1 121confirmed healthy was included in our study. Conduction along n. Medianus, n. Ulnaris, n. Musculocutaneus, n. Axillaris, n. Facialis, n. Tibialis, n. Peroneus et n. Femoralis was registered, with latency and amplitude of compound muscle action potential (CMAP) being analyzed...
2017: Advances in Gerontology, Uspekhi Gerontologii
https://www.readbyqxmd.com/read/28555052/blackcurrant-alters-physiological-responses-and-femoral-artery-diameter-during-sustained-isometric-contraction
#15
Matthew David Cook, Stephen David Myers, Mandy Lucinda Gault, Mark Elisabeth Theodorus Willems
Blackcurrant is rich in anthocyanins that may affect exercise-induced physiological responses. We examined tissue oxygen saturation, muscle activity, cardiovascular responses and femoral artery diameter during a submaximal sustained isometric contraction. In a randomised, double-blind, crossover design, healthy men (n = 13, age: 25 ± 4 years, BMI: 25 ± 3 kg·m(-2), mean ± SD) ingested New Zealand blackcurrant (NZBC) extract (600 mg∙day(-1) CurraNZ™) or placebo (PL) for 7-days separated by 14-days washout...
May 29, 2017: Nutrients
https://www.readbyqxmd.com/read/28552923/the-influence-of-aging-on-the-isometric-torque-sharing-patterns-among-the-plantar-flexor-muscles
#16
Liliam F Oliveira, Debora Verneque, Luciano L Menegaldo
PURPOSE: Physiological cross-sectional area (PCSA) reduction of the triceps surae (TS) muscles during aging suggests a proportional loss of torque among its components: soleus, medial and lateral gastrocnemii. However, direct measurements of muscle forces in vivo are not feasible. The purpose of this paper was to compare, between older and young women, isometric ankle joint torque sharing patterns among TS muscles and tibialis anterior (TA). METHODS: An EMG-driven model was used for estimating individual muscle torque contributions to the total plantar flexor torque, during sustained contractions of 10% and 40% of maximum voluntary contraction (MVC)...
2017: Acta of Bioengineering and Biomechanics
https://www.readbyqxmd.com/read/28552496/effects-of-novel-guidance-tubing-gait-on-emg-neuromuscular-imbalance-and-joint-angular-kinematics-during-locomotion-in-hemiparetic-stroke-patients
#17
Jeong J Lee, Joshua Sung H You
OBJECTIVE: To compare the immediate effects of conventional treadmill gait (CTG) and guidance tubing gait (GTG) on electromyographic (EMG) neuromuscular imbalance and knee joint kinematics in hemiparetic gait. DESIGN: Case control study. SETTING: University medical center. PARTICIPANTS: Eighteen patients with hemiparetic stroke (18 experimental, mean (SD) age 39.2 (16.8) years) and 15 healthy controls, mean age 26.3 (2...
May 25, 2017: Archives of Physical Medicine and Rehabilitation
https://www.readbyqxmd.com/read/28543166/chronic-emgs-in-treadmill-running-sod1-mice-reveal-early-changes-in-muscle-activation
#18
K A Quinlan, E Kajtaz, J D Ciolino, R D Imhoff-Manuel, M C Tresch, C J Heckman, V M Tysseling
To improve our understanding of early disease mechanisms and find reliable biomarkers of amyotrophic lateral sclerosis (ALS), a progressive neurodegenerative disease, we measured electromyogram (EMG) activity in hind limb muscles of SOD1G93A mice. In contrast to clinical diagnostic measures using EMGs, which are performed on quiescent patients, we monitored activity during treadmill running in order to detect presymptomatic changes in motor patterning. Chronic EMG electrodes were implanted into vastus lateralis (VL), biceps femoris posterior (BFP), lateral gastrocnemius (LG), and tibialis anterior (TA) in mice from postnatal day (P) 55-100, and results were assessed using linear mixed models...
May 24, 2017: Journal of Physiology
https://www.readbyqxmd.com/read/28541902/complex-neuromuscular-changes-post-stroke-revealed-by-clustering-index-analysis-of-surface-electromyogram
#19
Xu Zhang, Zhongqing Wei, Xiaoting Ren, Xiaoping Gao, Xiang Chen, Ping Zhou
The objective of this study was to characterize complex neuromuscular changes induced by a hemisphere stroke through a novel clustering index (CI) analysis of surface electromyogram (EMG). The CI analysis was performed using surface EMG signals collected bilaterally from the thenar muscles of 17 subjects with stroke and 12 age-matched healthy controls during their performance of varying levels of isometric muscle contractions. Compared with the neurologically intact or contralateral muscles, mixed CI patterns were observed in the paretic muscles...
May 24, 2017: IEEE Transactions on Neural Systems and Rehabilitation Engineering
https://www.readbyqxmd.com/read/28527720/overactive-bladder-oab-a-symptom-in-search-of-a-disease-its-relationship-to-specific-lower-urinary-tract-symptoms-and-conditions
#20
Jason P Van Batavia, Andrew J Combs, Angela M Fast, Kenneth I Glassberg
BACKGROUND: The ICCS defines OAB by the subjective symptom of urgency; detrusor overactivity (DO) is only implied. While no other symptom is required, OAB can also be associated with urinary frequency, decreased functional bladder capacity, and incontinence. OBJECTIVE: We sought to determine how often these associated findings occur in OAB and what if any uroflow/EMG-defined conditions are found to be associated with it. METHODS: The charts of 548 children (231M, 318F; mean age 9...
March 10, 2017: Journal of Pediatric Urology
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