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https://www.readbyqxmd.com/read/29779611/compliance-control-for-a-hydraulic-bouncing-system
#1
Guangrong Chen, Junzheng Wang, Shoukun Wang, Jiangbo Zhao, Wei Shen
This paper is to reduce the contact impact, control the leg stiffness and bouncing height. Firstly, the combining position/force active compliance control was involved in the deceleration phase to decrease the impact force and improve the leg compliance capacity. Then a reasonable velocity control of cylinder was addressed to control the bouncing height to the given value in the acceleration phase. Due to the model uncertainties and disturbances in the deceleration and acceleration phase, a near inverse like controller with a proportional and differential control (PD) was added into the velocity control of acceleration phase to compensate the bouncing height control error...
May 17, 2018: ISA Transactions
https://www.readbyqxmd.com/read/29768094/lower-limb-stiffness-testing-in-athletic-performance-a-critical-review
#2
Sean J Maloney, Iain M Fletcher
Stiffness describes the resistance of a body to deformation. In regard to athletic performance, a stiffer leg-spring would be expected to augment performance by increasing utilisation of elastic energy. Two-dimensional spring-mass and torsional spring models can be applied to model whole-body (vertical and/or leg stiffness) and joint stiffness. Various tasks have been used to characterise stiffness, including hopping, gait, jumping, sledge ergometry and change of direction tasks. Appropriate levels of reliability have been reported in most tasks, although they vary between investigations...
May 16, 2018: Sports Biomechanics
https://www.readbyqxmd.com/read/29761101/fibromyalgia-syndrome-a-case-report-on-controlled-remission-of-symptoms-by-a-dietary-strategy
#3
Silvia Maria Lattanzio, Francesca Imbesi
A 34-year-old woman suffered from significant chronic pain, depression, non-restorative sleep, chronic fatigue, severe morning stiffness, leg cramps, irritable bowel syndrome, hypersensitivity to cold, concentration difficulties, and forgetfulness. Blood tests were negative for rheumatic disorders. The patient was diagnosed with Fibromyalgia syndrome (FMS). Due to the lack of effectiveness of pharmacological therapies in FMS, she approached a novel metabolic proposal for the symptomatic remission. Its core idea is supporting serotonin synthesis by allowing a proper absorption of tryptophan assumed with food, while avoiding, or at least minimizing the presence of interfering non-absorbed molecules, such as fructose and sorbitol...
2018: Frontiers in Medicine
https://www.readbyqxmd.com/read/29740569/kinetic-analysis-of-downward-step-posture-according-to-the-foothold-heights-and-visual-information-blockage-in-cargo-truck
#4
Seung-Hyun Hyun, Che-Cheong Ryew
The study was undertaken to compare and analyze kinetic variables during downward foot-on according to the foothold heights under interrupted-visual information on 25-t cargo truck. Skilled adult male drivers (n=10) engaged in cargo truck driving over 1 year participated in the experiment. The results obtained from cinematographic and ground reaction force data during downward foot-on as follows; First, leg stiffness, peak vertical force (PVF) and loading rate showed significant difference as an increase of foothold heights, that is, interrupted-visual information showed greater impulse force than as was not...
April 2018: Journal of Exercise Rehabilitation
https://www.readbyqxmd.com/read/29738296/microcurrent-as-an-adjunct-therapy-to-accelerate-chronic-wound-healing-and-reduce-patient-pain
#5
Harikrishna K R Nair
OBJECTIVE: The primary aim is to assess the efficacy of microcurrent, a form of electrical stimulation, as an adjunct therapy in accelerating healing in chronic wounds by reducing wound size and pain level. The secondary aim is to assess the qualitative changes in these parameters: inflammatory symptoms, vasodilation, sleep quality, gait and frequency of bowel movement. METHOD: Eligible patients with chronic wounds were enrolled between March and June 2016, from the Wound Care Unit, Hospital Kuala Lumpur in this consecutive case series...
May 2, 2018: Journal of Wound Care
https://www.readbyqxmd.com/read/29732595/noninvasive-measurement-of-sciatic-nerve-stiffness-in-patients-with-chronic-low-back-related-leg-pain-using-shear-wave-elastography
#6
Tiago Neto, Sandro R Freitas, Ricardo J Andrade, João R Vaz, Bruno Mendes, Telmo Firmino, Paula M Bruno, Antoine Nordez, Raúl Oliveira
OBJECTIVES: The purpose of this study was to determine whether sciatic nerve stiffness is altered in people with chronic low back-related leg pain by using shear wave elastography. METHODS: In this cross-sectional study, the sciatic nerve shear wave velocity (ie, an index of stiffness) was measured in both legs of 16 participants (8 with unilateral low back-related leg pain and 8 healthy controls). Sciatic stiffness was measured during a passive ankle dorsiflexion motion performed at 2°/s in an isokinetic dynamometer...
May 6, 2018: Journal of Ultrasound in Medicine: Official Journal of the American Institute of Ultrasound in Medicine
https://www.readbyqxmd.com/read/29712747/holding-tight-on-feathers-structural-specializations-and-attachment-properties-of-the-avian-ectoparasite-crataerina-pallida-diptera-hippoboscidae
#7
Dennis S Petersen, Nils Kreuter, Lars Heepe, Sebastian Büsse, Arndt H J Wellbrock, Klaudia Witte, Stanislav N Gorb
The louse fly Crataerina pallida is an obligate blood-sucking ecto-parasite of the common swift Apus apus Due to reduction of the wings, C. pallida is unable to fly, thus an effective and reliable attachment to their host's plumage is of outmost importance. Its attachment system shows several modifications in comparison to other calyptrate flies. The most prominent ones are the large tridentate claws and the dichotomously shaped setae located on the pulvilli. Based on data from morphological analysis, confocal laser scanning microscopy, cryo-scanning electron microscopy and traction force experiments, performed on native (feathers) as well as artificial substrates (glass, epoxy-resin and silicone rubber), we showed that the entire attachment system is highly adapted to the fly's lifestyle as an ectoparasite...
April 30, 2018: Journal of Experimental Biology
https://www.readbyqxmd.com/read/29705521/vertical-stiffness-and-balance-control-of-two-legged-hopping-in-place-in-children-with-and-without-down-syndrome
#8
Matthew Beerse, Jianhua Wu
BACKGROUND: Children with Down syndrome (DS) are known for their reduced balance control, and typically take longer to develop motor skills and display less coordinated movement patterns. Hopping in-place is a gross motor skill requiring whole-body vertical stiffness and horizontal movement control, particularly when attempting to modify hopping frequency. However, there is a lack of knowledge of the hopping capacity of children with DS. RESEARCH QUESTION: The purpose of this study was to assess the ability of children with DS aged 5-11 years old to continuously hop in-place on two legs and compare their biomechanical patterns to those of typically developing (TD) children...
April 22, 2018: Gait & Posture
https://www.readbyqxmd.com/read/29689986/additions-to-the-indonesian-crab-fauna-of-the-genus-mariaplax-rahayu-ng-2014-and-notes-on-hexapus-timika-rahayu-ng-2014-crustacea-decapoda-brachyura-hexapodidae
#9
Dwi Listyo Rahayu, Ernawati Widyastuti
Hexapus timika Rahayu Ng, 2014 is redescribed based on newly collected male and female specimens from Papua, Indonesia. Three new species from Jakarta Bay and Sunda Strait, Indonesia, are added to the genus Mariaplax, the richest genus in the family Hexapodidae, hitherto having 14 species. Mariaplax pitrai n. sp. has the carapace covered by small, closely-spaced tubercles and long ambulatory legs, resembling M. chenae Rahayu Ng, 2014 but easily separated by the position of female vulvae. Mariaplax hispida n...
February 13, 2018: Zootaxa
https://www.readbyqxmd.com/read/29661643/muscle-ultrasound-elastography-and-mri-in-preschool-children-with-duchenne-muscular-dystrophy
#10
Anna Pichiecchio, Francesco Alessandrino, Chandra Bortolotto, Alessandra Cerica, Cristina Rosti, Maria Vittoria Raciti, Marta Rossi, Angela Berardinelli, Giovanni Baranello, Stefano Bastianello, Fabrizio Calliada
The aim of this study was to determine muscle tissue elasticity, measured with shear-wave elastography, in selected lower limb muscles of patients affected by Duchenne muscular dystrophy (DMD) and to correlate the values obtained with those recorded in healthy children and with muscle magnetic resonance imaging (MRI) data from the same DMD children, specifically the pattern on T1-weighted (w) and short-tau inversion recovery (STIR) sequences. Five preschool DMD children and five age-matched healthy children were studied with shear-wave elastography...
April 13, 2018: Neuromuscular Disorders: NMD
https://www.readbyqxmd.com/read/29660419/effective-leg-stiffness-of-animal-running-and-the-co-optimization-of-energetic-cost-and-stability
#11
ZhuoHua Shen, Justin Seipel
The relative leg stiffness of most running animals falls in a small range between 7 and 27. Here we present a theoretical study of an established running model, an actuated Spring Loaded Inverted Pendulum model, to determine if the energetic cost and stability of running might be co-optimized over this range of leg stiffness values. The energetic cost of the model is quantified as the energy spent to move a unit mass a unit distance. The stability of the model is based on the system response to perturbations with respect to periodic locomotion solutions, and uses the linearized dynamics of Poincaré return maps and the resulting maximum eigenvalue and singular value decomposition in order to analyze asymptotic stability and the overall system response to perturbations, respectively...
April 13, 2018: Journal of Theoretical Biology
https://www.readbyqxmd.com/read/29657848/medial-subvastus-versus-the-medial-parapatellar-approach-for-total-knee-replacement-a-systematic-review-and-meta-analysis-of-randomized-controlled-trials
#12
James R Berstock, James R Murray, Michael R Whitehouse, Ashley W Blom, Andrew D Beswick
Twenty randomized controlled trials comprising 1893 primary total knee replacements were included in this review.The subvastus approach conferred superior results for mean difference (MD) in time to regain an active straight leg raise (1.7 days, 95% confidence interval [CI] 1.0 to 2.3), visual analogue score for pain on day one (0.8 points on a scale out of 10, 95% CI 0.2 to 1.4) and total range of knee movement at one week (7°, 95% CI 3.2 to 10.7). The subvastus approach also resulted in fewer lateral releases (odds ratio 0...
March 2018: EFORT Open Reviews
https://www.readbyqxmd.com/read/29657461/growth-modulation-for-coronal-deformity-correction-by-using-eight-plates-systematic-review
#13
REVIEW
Sanjay Kumar, S V Sonanis
Introduction: Coronal deformities are commonly encountered in paediatric orthopaedics and surgical treatment is indicated for severe deformities causing pain, function and cosmetic problems. In a growing bone, major surgical intervention like osteotomy with internal or external fixation can be avoided by growth modulation (hemiepiphysiodesis) using 8-plates. Our aim is to review the published literature on the use of 8-plates for deformity correction. Methods: We conducted a systematic review on 8-plate growth modulation for coronal deformity correction...
March 2018: Journal of Orthopaedics
https://www.readbyqxmd.com/read/29618165/small-arteries-stay-stiff-for-a-longer-period-following-vibration-exercises-in-combination-with-blood-flow-restriction
#14
Ulku Karabulut, Murat Karabulut, Eric G James
PURPOSE: The aim of this study was to assess the effect of isometric exercises performed during whole-body vibration (WBV) with and without blood flow restriction (BFR) on arterial elasticity and hemodynamic variables. METHODS: Eight male subjects performed static upper body (UB) and lower body (LB) exercises on a vibration platform with and without BFR. During BFR sessions, BFR cuffs were placed on the arms or legs and inflated to a target pressure. Exercises consisted of eight 45-s sets for UB, and ten 1-min sets for LB...
April 4, 2018: Clinical Physiology and Functional Imaging
https://www.readbyqxmd.com/read/29600202/late-and-vague-presentation-of-septic-arthritis-of-hip-in-a-ivdrug-abuser
#15
Anantha Krishnan Raghupathi, Avinash Joshi
Introduction: Septic arthritis of the hip is a rare entity in acute presentation of hip pain in adults. Even though hip is the second most commonly affected joint, adult patients with septic arthritis not related to a surgical procedure represent <0.00001% of total acute admissions. Case Report: We present a 32-year-old female intravenous drug abuser, positive for Hepatitis B and C who had started to inject her femoral veins 2 years ago. She presented with a 10 weeks history of radiating pain in the leg which was full, constant and diffuse in nature with hip stiffness...
November 2017: Journal of Orthopaedic Case Reports
https://www.readbyqxmd.com/read/29589111/effects-of-resistance-training-on-mri-derived-epicardial-fat-volume-and-arterial-stiffness-in-women-with-obesity-a-randomized-pilot-study
#16
Maria Fernandez-Del-Valle, Joaquin U Gonzales, Shelby Kloiber, Sunanda Mitra, Jon Klingensmith, Eneko Larumbe-Zabala
AIM: To date, few studies have analyzed the effects of exercise on cardiac adipose tissue. Overall, exercise programs did not meet the recommendations for significant weight loss, the utilization of resistance training was minimal, and the conclusions derived from these studies have diminished exercise as a strategy for cardiac fat loss. PURPOSE: The objective of this pilot study was to analyze the effects of 3-week high-intensity, moderate-volume muscular endurance resistance training (RT) on cardiac fat and arterial stiffness...
March 27, 2018: European Journal of Applied Physiology
https://www.readbyqxmd.com/read/29582181/self-myofascial-vibro-shearing-a-randomized-controlled-trial-of-biomechanical-and-related-changes-in-male-breakdancers
#17
Christopher-Marc Gordon, Sophie Manuela Lindner, Niels Birbaumer, Pedro Montoya, Rachel L Ankney, Frank Andrasik
BACKGROUND: This randomized controlled trial explored the practicality and effectiveness of a novel tool-assisted self-help device, one that combines vibrational oscillation, leverage, and the shearing effect from the edges, for promoting meaningful changes in key biochemical tissue indices and related parameters. METHODS: One hundred and thirteen male breakdancers were randomized to an intervention or control group. Individuals assigned to the intervention group performed the self-help treatment on the quadriceps and the iliotibial band of their right thighs for 8 min, while individuals assigned to the control condition merely sat quietly during this period...
March 27, 2018: Sports Medicine—Open
https://www.readbyqxmd.com/read/29576951/change-in-skeletal-muscle-stiffness-after-running-competition-is-dependent-on-both-running-distance-and-recovery-time-a-pilot-study
#18
Seyedali Sadeghi, Cassidy Newman, Daniel H Cortes
Long-distance running competitions impose a large amount of mechanical loading and strain leading to muscle edema and delayed onset muscle soreness (DOMS). Damage to various muscle fibers, metabolic impairments and fatigue have been linked to explain how DOMS impairs muscle function. Disruptions of muscle fiber during DOMS exacerbated by exercise have been shown to change muscle mechanical properties. The objective of this study is to quantify changes in mechanical properties of different muscles in the thigh and lower leg as function of running distance and time after competition...
2018: PeerJ
https://www.readbyqxmd.com/read/29571012/have-pedestrian-subsystem-tests-improved-passenger-car-front-shape
#19
Guibing Li, Fang Wang, Dietmar Otte, Zhihua Cai, Ciaran Simms
Subsystem impactor tests are the main approaches for evaluation of safety performance of vehicle front design for pedestrian protection in legislative regulations. However, the main aspects of vehicle safety for pedestrians are shape and stiffness, and though it is clear that subsystem impact tests encourage lower vehicle front stiffness, it is unclear whether they promote improved vehicle front shapes for pedestrian protection. The purpose of this paper is therefore to investigate the effects of European pedestrian safety regulations on passenger car front shape and pedestrian injury risk using recent German In-Depth Accident Study (GIDAS) pedestrian collision data and numerical simulations...
March 20, 2018: Accident; Analysis and Prevention
https://www.readbyqxmd.com/read/29570601/effect-of-compression-garments-on-controlled-force-output-after-heel-rise-exercise
#20
Emika Kato, Mariko Nakamura, Hideyuki Takahashi
Kato, E, Nakamura, M, and Takahashi, H. Effect of compression garments on controlled force output after heel-rise exercise. J Strength Cond Res 32(4): 1174-1179, 2018-The purpose of this study was to elucidate the effects of compression garments (CG) on controlled force output after strenuous exercise. Sixteen healthy volunteers completed trials both with CG and without CG (control trial: CON) on 2 separate, random days which were at least 1 month apart. Both trials required participants to perform heel-rise exercises from maximal dorsiflexion to maximal plantar flexion 20 times with a single leg...
April 2018: Journal of Strength and Conditioning Research
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