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https://www.readbyqxmd.com/read/29106420/a-small-graphene-oxide-sheet-polyvinylidene-fluoride-bilayer-actuator-with-large-and-rapid-responses-to-multiple-stimuli
#1
Guochuang Xu, Miao Zhang, Qinqin Zhou, Hongwu Chen, Tiantian Gao, Chun Li, Gaoquan Shi
A high-performance actuator should be able to deliver large-shape deformations, fast actuations and sensitive responses to multiple stimuli. Here, we report such an actuator constructed from one layer of polyvinylidene fluoride (PVDF) with a high coefficient of thermal expansion (CTE), and another layer of small sheets of graphene oxide (SGO) with a negative CTE. The opposite deformations of both actuation layers make the SGO/PVDF bilayer actuator highly sensitive to the temperature stimulus with a large bending sensitivity of 1...
November 16, 2017: Nanoscale
https://www.readbyqxmd.com/read/29089111/trunk-response-and-stability-in-standing-under-sagittal-symmetric-pull-push-forces-at-different-orientations-elevations-and-magnitudes
#2
Z El Ouaaid, A Shirazi-Adl, A Plamondon
To reduce lifting and associated low back injuries, manual material handling operations often involve pulling-pushing of carts at different weights, orientations, and heights. The loads on spine and risk of injury however need to be investigated. The aim of this study was to evaluate muscle forces, spinal loads and trunk stability in pull-push tasks in sagittal-symmetric, static upright standing posture. Three hand-held load magnitudes (80, 120 and 160 N) at four elevations (0, 20, 40 and 60 cm to the L5-S1) and 24 force directions covering all pull/push orientations were considered...
October 25, 2017: Journal of Biomechanics
https://www.readbyqxmd.com/read/29076958/gluteus-maximus-and-hamstring-activation-during-selected-weight-bearing-resistance-exercises
#3
Kevin McCurdy, John Walker, Derrick Yuen
McCurdy, K, Walker, J, and Yuen, D. Gluteus maximus and hamstring activation during selected weight-bearing resistance exercises. J Strength Cond Res XX(X): 000-000, 2017-The purpose of this study was to compare the gluteus maximus (GM) and hamstring group (HG) electromyographic (EMG) activation levels among selected weight-bearing resistance exercises. Eighteen young adult females with previous resistance training experience completed the study. Strength was assessed on the bilateral squat (BS) (3 repetition maximum [RM]), modified single-leg squat (MSLS) (3RM), and stiff-leg deadlift (SLDL) (8RM) to determine an 8RM load for all lifts...
October 20, 2017: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/29075819/augmentation-mastopexy-with-a-dermal-encapsulated-round-or-anatomic-autoprosthesis
#4
Safvet Ors
INTRODUCTION: Several factors, such as aging, pregnancy, and weight loss, reduce the elasticity of the breast tissue, and ptosis occurs. Due to aging and gravity, it is not possible to completely prevent breast ptosis. The goal is to delay the recurrence of ptosis as much as possible. PATIENTS AND METHODS: This study included 20 female patients aged 25-55 years. The patients who underwent surgery had different levels of ptosis. Although the patients wanted their breasts to be lifted and an increase in projection, they did not want implants to be used...
October 26, 2017: Aesthetic Plastic Surgery
https://www.readbyqxmd.com/read/29064986/male-surgical-neck-rejuvenation
#5
REVIEW
Ronald L Moy, Lauren Moy
BACKGROUND: Patients who are aging, with weight gain, and increased skin laxity, request dermatologists to improve their neck area. Surgical and nonsurgical options are reviewed as well as benefits and side effects. This article will focus on how surgical techniques can be applied for male patients in particular. OBJECTIVE: To review surgical neck rejuvenation therapies available currently to find the best option for male patients. CONCLUSION: Surgical treatment of the male neck to improve mandibular contour and loose neck skin requires tightening of the platysmal muscle and usually skin removal in the postauricular sulcus and into the hairline...
November 2017: Dermatologic Surgery: Official Publication for American Society for Dermatologic Surgery [et Al.]
https://www.readbyqxmd.com/read/29059498/respiratory-reflex-generated-by-movement-of-the-arms
#6
Ranjit K Mal
In their article "Motor control of the trunk during a modified clean and jerk lift", Eriksson Crommert, Ekblom and Thortensson(1) measured the intra-abdominal pressure (IAP) and trunk muscle activity at various stages of lifting a 30-kg weight. They observed that the "TrA (transversus abdominis muscle) was more active in a position with augmented postural demand, i.e., with the arms above the head" and that "The activation of TrA was relatively low in the lower parts of the lift, despite a higher load in terms of imposed flexor moment (judged from the sketches in the figures, not calculated) corroborated by increases in ES activation and IAP amplitude, both providing the extensor moment necessary to raise the trunk...
October 23, 2017: Scandinavian Journal of Medicine & Science in Sports
https://www.readbyqxmd.com/read/29054327/sex-differences-in-anticipatory-postural-adjustments-during-rapid-single-leg-lift
#7
Melanie D Bussey, Marcelo Peduzzi de Castro, Daniela Aldabe, Jonathan Shemmell
The aim of this study was to assess the influence of sex on the kinetic, kinematic and neuromuscular correlates of anticipatory postural adjustments (APAs) during a single leg lift task performed by healthy participants. Fifty healthy age and body mass index matched participants (25 women and 25 men) performed 20 single leg lift task (hip flexion to 90 ° as quickly as possible) with their dominant and their non-dominant lower limbs. A force plate was used to determine the medial-lateral displacement of the center of pressure (COPML), and the initiation of weight shift (T0); kinematics was used to determine leg lift (T1); and electromyography was used to determine onset times from eight muscles: bilateral external oblique, internal oblique and lumbar multifidus, and unilateral (stance limb) gluteus maximus and biceps femoris...
October 17, 2017: Human Movement Science
https://www.readbyqxmd.com/read/28965479/effects-of-the-weight-configuration-of-hand-load-on-trunk-musculature-during-static-weight-holding
#8
Saman Madinei, Xiaopeng Ning
The performance of manual material handling tasks is one major cause of lower back injuries. In the current study, we investigated the influence of the weight configuration of hand loads on trunk muscle activities and the associated spinal stability. Thirteen volunteers each performed static weight holding tasks using two different 9 kg weight bars (with medial and lateral weight configurations) at two levels of heights (low and high) and one fixed horizontal distance (which resulted in constant spinal joint moment across conditions)...
October 2, 2017: Ergonomics
https://www.readbyqxmd.com/read/28932006/a-newly-developed-floor-chair-placed-on-an-office-chair-reduces-lumbar-muscle-fatigue-by-cyclically-changing-its-lumbar-supporting-shape
#9
Tadamitsu Matsuda, Takayuki Koyama, Yasushi Kurihara, Miki Tagami, Yasuaki Kusumoto, Osamu Nitta
[Purpose] This study investigated lumbar muscle fatigue before and after maintaining a seated position for one hour, lumbar and pelvic inclination angle change, in subjects with and without active lumber support. [Subjects and Methods] Fourteen healthy subjects randomized into two groups sat on a floor chair, placed on an office chair, that cyclically changed its lumbar supporting shape to provide active lumbar support (ALS) or no ALS for one hour. Before and after, we measured the frequency of muscle waveforms of the trunk extensor muscles when the subjects lifted an object weighing 10% of their body weight, using both hands while seated...
September 2017: Journal of Physical Therapy Science
https://www.readbyqxmd.com/read/28900561/effects-of-a-band-loop-on-lower-extremity-muscle-activity-and-kinematics-during-the-barbell-squat
#10
Ryan C A Foley, Brittany D Bulbrook, Duane C Button, Michael W R Holmes
BACKGROUND: Medial knee collapse can signal an underlying movement issue that, if uncorrected, can lead to a variety of knee injuries. Placing a band around the distal thigh may act as a proprioceptive aid to minimize medial collapse of the knee during squats; however, little is known about EMG and biomechanics in trained and untrained individuals during the squat with an elastic band added. HYPOTHESIS/PURPOSE: To investigate the effects of the TheraBand® Band Loop on kinematics and muscle activity of the lower extremity during a standard barbell back squat at different intensities in both trained and untrained individuals...
August 2017: International Journal of Sports Physical Therapy
https://www.readbyqxmd.com/read/28813796/feedforward-model-based-arm-weight-compensation-with-the-rehabilitation-robot-armin
#11
Fabian Just, Ozhan Ozen, Stefano Tortora, Robert Riener, Georg Rauter
Highly impaired stroke patients at early stages of recovery are unable to generate enough muscle force to lift the weight of their own arm. Accordingly, task-related training is strongly limited or even impossible. However, as soon as partial or full arm weight support is provided, patients are enabled to perform arm rehabilitation training again throughout an increased workspace. In the literature, the current solutions for providing arm weight support are mostly mechanical. These systems have components that restrict the freedom of movement or entail additional disturbances...
July 2017: IEEE ... International Conference on Rehabilitation Robotics: [proceedings]
https://www.readbyqxmd.com/read/28727649/variables-affecting-intra-abdominal-pressure-during-lifting-in-the-early-postpartum-period
#12
Yvonne Hsu, Robert Hitchcock, Stefan Niederauer, Ingrid E Nygaard, Janet M Shaw, Xiaoming Sheng
OBJECTIVES: Intra-abdominal pressure (IAP) may contribute to pelvic floor health, although the direction and magnitude of such an effect, if any, are not yet known. Identifying individual characteristics, and in particular modifiable factors, associated with higher IAP during recovery from vaginal childbirth might serve to mitigate early pelvic floor dysfunction. The aim of this study was to identify characteristics associated with maximal IAP during lifting in postpartum primiparous women who delivered vaginally...
July 20, 2017: Female Pelvic Medicine & Reconstructive Surgery
https://www.readbyqxmd.com/read/28695558/rehabilitation-in-patients-with-pulmonary-arterial-hypertension
#13
Stephan Keusch, Alexander Turk, Stéphanie Saxer, Nicola Ehlken, Ekkehard Grunig, Silvia Ulrich, On Behalf Of The Swiss Society Of Pulmonary Hypertension
Exertional dyspnoea is a leading symptom in patients with pulmonary arterial hypertension (PAH). Patients suffering from PAH report poor quality of life, have skeletal muscle dysfunction and in the absence of advanced medical therapy deteriorate progressively due to right heart failure which can lead to death. For decades, patients with PAH were advised to avoid exercise in fear of exacerbated right heart failure. Recently, it has been shown that a highly supervised rehabilitation programme in expert centres leads to significant improvements in symptoms, quality of life, exercise capacity and may even enhance haemodynamics in selected stable patients treated with advanced regimens of PAH-targeted drugs...
July 11, 2017: Swiss Medical Weekly
https://www.readbyqxmd.com/read/28686081/letter-to-the-editor-concerning-the-article-bar-velocities-capable-of-optimising-the-muscle-power-in-strength-power-exercises-by-loturco-pereira-abad-tabares-moraes-kobal-kitamura-nakamura-2017
#14
Slobodan Jaric, Amador Garcia Ramos
Loturco and co-workers (2017) recently published data in the Journal of Sports Sciences to present the optimum loading magnitudes regarding the maximization of the "mean propulsive power" of the leg and arm muscles. Among the most important findings were that (1) the recorded power in the squat and squat jump exercises was markedly low, (2) the optimum external load that maximized the power in the same exercises was close to 100% of body weight, while (3) the ballistic bench press throw revealed smaller power than the regular bench press typically performed with relatively low level of muscle activation towards the end of the propulsive lifting phase...
July 7, 2017: Journal of Sports Sciences
https://www.readbyqxmd.com/read/28596267/adaptations-of-motoneuron-properties-after-weight-lifting-training-in-rats
#15
Piotr Krutki, Włodzimierz Mrówczyński, Marcin Bączyk, Dawid Łochyński, Jan Celichowski
Resistance training, with repeated short-term and high-intensity exercises, is responsible for an increase in muscle mass and force. The aim of this study was to determine whether such training induces adaptations in the electrophysiological properties of motoneurons innervating the trained muscles and to relate these adaptive changes to previous observations made on motor unit contractile properties. The study was performed on adult male Wistar rats. Animals from the training group were subjected to a five-week voluntary progressive weight-lifting program, while control rats were restricted to standard cage activity...
June 8, 2017: Journal of Applied Physiology
https://www.readbyqxmd.com/read/28593763/high-performance-electroactive-polymer-actuators-based-on-ultrathick-ionic-polymer-metal-composites-with-nanodispersed-metal-electrodes
#16
Hyuck Sik Wang, Jaehyun Cho, Dae Seok Song, Jong Hyun Jang, Jae Young Jho, Jong Hyuk Park
Ionic polymer-metal composites (IPMCs) have been proposed as biomimetic actuators that are operable at low applied voltages. However, the bending strain and generating force of the IPMC actuators have generally exhibited a trade-off relationship, whereas simultaneous enhancement of both the qualities is required for their practical applications. Herein, a significant improvement in both the strain and force of the IPMC actuators is achieved by a facile approach, exploiting thickness-controlled ion-exchange membranes and nanodispersed metal electrodes...
July 5, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28584310/effects-of-external-loading-on-lumbar-extension-moment-during-squat-lifting
#17
Iman Vahdat, Mostafa Rostami, Farhad Tabatabai Ghomsheh, Siamak Khorramymehr, Ali Tanbakoosaz
OBJECTIVES: The main objective of this study has been qualitative investigation of the effects of external loading on the lumbar extension moment during squat lifting. Findings of this study may allow to determine the factor with the most considerable effect on the lumbar extension moment and may help determine the lumbar spine risk factors at temporo-spatial coordination during squat lifting. MATERIAL AND METHODS: Twelve healthy men volunteered to perform slow and fast squat lifting of a box of varied mass (4 kg, 8 kg and 12 kg)...
May 29, 2017: International Journal of Occupational Medicine and Environmental Health
https://www.readbyqxmd.com/read/28558314/flexion-synergy-overshadows-flexor-spasticity-during-reaching-in-chronic-moderate-to-severe-hemiparetic-stroke
#18
Michael D Ellis, Ingrid Schut, Julius P A Dewald
OBJECTIVE: Pharmaceutical intervention targets arm flexor spasticity with an often-unsuccessful goal of improving function. Flexion synergy is a related motor impairment that may be inadvertently neglected. Here, flexor spasticity and flexion synergy are disentangled to determine their contributions to reaching dysfunction. METHODS: Twenty-six individuals participated. A robotic device systematically modulated shoulder abduction loading during ballistic reaching...
July 2017: Clinical Neurophysiology: Official Journal of the International Federation of Clinical Neurophysiology
https://www.readbyqxmd.com/read/28557850/compensatory-muscle-activation-during-unstable-overhead-squat-using-a-water-filled-training-tube
#19
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/28557663/dietary-supplement-intake-and-associated-factors-among-gym-users-in-a-university-community
#20
Amita Attlee, Amina Haider, Asma Hassan, Noura Alzamil, Mona Hashim, Reyad Shaker Obaid
Dietary supplement intake and associated factors among gym users in a university community in Sharjah, United Arab Emirates (UAE), were assessed using a structured, self-administered questionnaire in this cross-sectional study. Adults (N = 320) from five gyms in the University City of Sharjah participated in this cross-sectional study. The prevalence of dietary supplement intake was 43.8%. Statistically significant associations were found between the use of dietary supplements and sex (47.7% males, 28.1% females; p = ...
May 30, 2017: Journal of Dietary Supplements
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