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https://www.readbyqxmd.com/read/29445037/on-the-diverse-roles-of-fluid-dynamic-drag-in-animal-swimming-and-flying
#1
REVIEW
R Godoy-Diana, B Thiria
Questions of energy dissipation or friction appear immediately when addressing the problem of a body moving in a fluid. For the most simple problems, involving a constant steady propulsive force on the body, a straightforward relation can be established balancing this driving force with a skin friction or form drag, depending on the Reynolds number and body geometry. This elementary relation closes the full dynamical problem and sets, for instance, average cruising velocity or energy cost. In the case of finite-sized and time-deformable bodies though, such as flapping flyers or undulatory swimmers, the comprehension of driving/dissipation interactions is not straightforward...
February 2018: Journal of the Royal Society, Interface
https://www.readbyqxmd.com/read/29373549/a-novel-grid-sins-dvl-integrated-navigation-algorithm-for-marine-application
#2
Yingyao Kang, Lin Zhao, Jianhua Cheng, Mouyan Wu, Xiaoliang Fan
Integrated navigation algorithms under the grid frame have been proposed based on the Kalman filter (KF) to solve the problem of navigation in some special regions. However, in the existing study of grid strapdown inertial navigation system (SINS)/Doppler velocity log (DVL) integrated navigation algorithms, the Earth models of the filter dynamic model and the SINS mechanization are not unified. Besides, traditional integrated systems with the KF based correction scheme are susceptible to measurement errors, which would decrease the accuracy and robustness of the system...
January 26, 2018: Sensors
https://www.readbyqxmd.com/read/29346971/drag-force-in-a-cold-or-hot-granular-medium
#3
A Seguin, P Gondret
We measure experimentally and analyze the resisting force exerted by a bidimensional packing of small disks on a larger intruder disk dragged horizontally at constant velocity V_{0}. Depending on the vibration level of the packing that leads to a granular "cold" or "hot" packing, two force regimes are observed. At low vibration level ("cold" granular medium), the drag force F does not depend on V_{0}, whereas for high vibrations ("hot" granular medium), the drag force increases linearly with V_{0}. Both regimes can be understood by the balance of two "granular temperatures" that can be defined in the system: a bulk temperature T_{b} imposed by the external vibration to the overall packing and a local temperature T_{0} induced by the own motion of the intruder disk in its vicinity...
September 2017: Physical Review. E
https://www.readbyqxmd.com/read/29244746/effects-of-beetroot-juice-supplementation-on-a-30-s-high-intensity-inertial-cycle-ergometer-test
#4
Raul Domínguez, Manuel Vicente Garnacho-Castaño, Eduardo Cuenca, Pablo García-Fernández, Arturo Muñoz-González, Fernando de Jesús, María Del Carmen Lozano-Estevan, Sandro Fernandes da Silva, Pablo Veiga-Herreros, José Luis Maté-Muñoz
Background: Beetroot juice (BJ) is rich in inorganic nitrates and has proved effective at increasing blood nitric oxide (NO) levels. When used as a supplement BJ has shown an ergogenic effect on cardiorespiratory resistance exercise modalities, yet few studies have examined its impact on high intensity efforts. Objective: To assess the effects of BJ intake on anaerobic performance in a Wingate test. Methods: Fifteen trained men (age 21.46 ± 1.72 years, height 1.78 ± 0.07 cm and weight 76.90 ± 8.67 kg) undertook a 30-s maximum intensity test on an inertial cycle ergometer after drinking 70 mL of BJ (5...
December 15, 2017: Nutrients
https://www.readbyqxmd.com/read/29127707/acoustic-characterization-and-enhanced-ultrasound-imaging-of-long-circulating-lipid-coated-microbubbles
#5
Hongbo Li, Yanye Yang, Meimei Zhang, Liping Yin, Juan Tu, Xiasheng Guo, Dong Zhang
OBJECTIVES: A long-circulating lipid-coated ultrasound (US) contrast agent was fabricated to achieve a longer wash-out time and gain more resistance against higher-mechanical index sonication. Systemic physical, acoustic, and in vivo imaging experiments were performed to better understand the underlying mechanism enabling the improvement of contrast agent performance by adjusting the physical and acoustic properties of contrast agent microbubbles. METHODS: By simply altering the gas core, a kind of US contrast agent microbubble was synthesized with a similar lipid-coating shell as SonoVue microbubbles (Bracco SpA, Milan, Italy) to achieve a longer wash-out time and higher inertial cavitation threshold...
November 11, 2017: Journal of Ultrasound in Medicine: Official Journal of the American Institute of Ultrasound in Medicine
https://www.readbyqxmd.com/read/29107539/is-inertial-flywheel-resistance-training-superior-to-gravity-dependent-resistance-training-in-improving-muscle-strength-a-systematic-review-with-meta-analyses
#6
REVIEW
J Vicens-Bordas, E Esteve, A Fort-Vanmeerhaeghe, T Bandholm, K Thorborg
OBJECTIVE: The primary aim of this systematic review was to determine if inertial flywheel resistance training is superior to gravity-dependent resistance training in improving muscle strength. The secondary aim was to determine whether inertial flywheel resistance training is superior to gravity-dependent resistance training in improving other muscular adaptations. DESIGN: A systematic review with meta-analyses of randomised and non-randomised controlled trials...
January 2018: Journal of Science and Medicine in Sport
https://www.readbyqxmd.com/read/28985727/respiratory-mechanics-in-infants-with-severe-bronchiolitis-on-controlled-mechanical-ventilation
#7
Pablo Cruces, Sebastián González-Dambrauskas, Julio Quilodrán, Jorge Valenzuela, Javier Martínez, Natalia Rivero, Pablo Arias, Franco Díaz
BACKGROUND: Analysis of respiratory mechanics during mechanical ventilation (MV) is able to estimate resistive, elastic and inertial components of the working pressure of the respiratory system. Our aim was to discriminate the components of the working pressure of the respiratory system in infants on MV with severe bronchiolitis admitted to two PICU's. METHODS: Infants younger than 1 year old with acute respiratory failure caused by severe bronchiolitis underwent neuromuscular blockade, tracheal intubation and volume controlled MV...
October 6, 2017: BMC Pulmonary Medicine
https://www.readbyqxmd.com/read/28964209/development-of-a-cryogenically-cooled-platform-for-the-magnetized-liner-inertial-fusion-maglif-program
#8
T J Awe, K P Shelton, A B Sefkow, D C Lamppa, J L Baker, D C Rovang, G K Robertson
A cryogenically cooled hardware platform has been developed and commissioned on the Z Facility at Sandia National Laboratories in support of the Magnetized Liner Inertial Fusion (MagLIF) Program. MagLIF is a magneto-inertial fusion concept that employs a magnetically imploded metallic tube (liner) to compress and inertially confine premagnetized and preheated fusion fuel. The fuel is preheated using a ∼2 kJ laser that must pass through a ∼1.5-3.5-μm-thick polyimide "window" at the target's laser entrance hole (LEH)...
September 2017: Review of Scientific Instruments
https://www.readbyqxmd.com/read/28923661/the-influence-of-the-aquatic-environment-on-the-center-of-pressure-impulses-and-upper-and-lower-trunk-accelerations-during-gait-initiation
#9
Andresa R Marinho-Buzelli, Kei Masani, Hossein Rouhani, Ana M Barela, Gustavo T B Fernandes, Mary C Verrier, Milos R Popovic
Gait initiation is defined as the transition from stationary standing to steady-state walking. Despite the frequent use of therapy pools for training walking in early stages of rehabilitation, none have been reported on the effects of immersion on gait initiation. We aimed to analyze the center of pressure (COP) trajectories, the vertical and anteroposterior impulses and upper and lower trunk accelerations during anticipatory (APA) and execution phases of gait initiation. In the COP trajectory, the execution (EXE) phase was further subdivided in two phases: predominantly mediolateral (EXE1), and predominantly anteroposterior (EXE2)...
October 2017: Gait & Posture
https://www.readbyqxmd.com/read/28894955/a-flexible-cell-concentrator-using-inertial-focusing
#10
Chunglong Tu, Jian Zhou, Yitao Liang, Bobo Huang, Yifeng Fang, Xiao Liang, Xuesong Ye
Cell concentration adjustment is intensively implemented routinely both in research and clinical laboratories. Centrifuge is the most prevalent technique for tuning biosample concentration. But it suffers from a number of drawbacks, such as requirement of experienced operator, high cost, low resolution, variable reproducibility and induced damage to sample. Herein we report on a cost-efficient alternative using inertial microfluidics. While the majority of existing literatures concentrate on inertial focusing itself, we identify the substantial role of the outlet system played in the device performance that has long been underestimated...
September 11, 2017: Biomedical Microdevices
https://www.readbyqxmd.com/read/28846856/perception-and-action-in-swimming-effects-of-aquatic-environment-on-upper-limb-inter-segmental-coordination
#11
Brice Guignard, Annie Rouard, Didier Chollet, Omar Ayad, Marco Bonifazi, Dario Dalla Vedova, Ludovic Seifert
This study assessed perception-action coupling in expert swimmers by focusing on their upper limb inter-segmental coordination in front crawl. To characterize this coupling, we manipulated the fluid flow and compared trials performed in a swimming pool and a swimming flume, both at a speed of 1.35ms(-1). The temporal structure of the stroke cycle and the spatial coordination and its variability for both hand/lower arm and lower arm/upper arm couplings of the right body side were analyzed as a function of fluid flow using inertial sensors positioned on the corresponding segments...
August 25, 2017: Human Movement Science
https://www.readbyqxmd.com/read/28753657/evolution-of-aortic-pressure-during-normal-ageing-a-model-based-study
#12
Stamatia Pagoulatou, Nikolaos Stergiopulos
BACKGROUND: The age-related increase in pulse pressure (PP) and systolic blood pressure (SBP) is often attributed to alterations in the wave reflection profile and augmented contributions of the reflected waves. However, clinical evidence shows that the stiffening of the proximal aorta with age and the consequent augmentation of the forward pressure wave plays an equally important role. The relative importance of the forward and reflected wave components in essential hypertension has not yet been fully elucidated...
2017: PloS One
https://www.readbyqxmd.com/read/28738671/inertial-flywheel-resistance-training-and-muscle-oxygen-saturation
#13
Rafael Timón, Jesús G Ponce-González, José L González-Montesinos, Guillermo Olcina, Alejandro Pérez-Pérez, José Castro-Piñero
BACKGROUND: The inertial flywheel device causes an increase in eccentric overload during training. The aim was to study muscle oxygen saturation produced during an inertial flywheel squat training, comparing it with a barbell squat training. METHODS: Twelve male adults performed a barbell squat training (3 x 8 reps, 75-80% 1RM) and a flywheel squat training (3 x 8 reps, all-out). Muscle oxygen saturation (%SmO2), total hemoglobin (tHb), reoxygenation, heart rate (HR), lactate, vertical jumps, maximal voluntary isometric contraction and rated perceived exertion (RPE) were studied...
July 24, 2017: Journal of Sports Medicine and Physical Fitness
https://www.readbyqxmd.com/read/28545824/classification-of-deadlift-biomechanics-with-wearable-inertial-measurement-units
#14
Martin A O'Reilly, Darragh F Whelan, Tomas E Ward, Eamonn Delahunt, Brian M Caulfield
The deadlift is a compound full-body exercise that is fundamental in resistance training, rehabilitation programs and powerlifting competitions. Accurate quantification of deadlift biomechanics is important to reduce the risk of injury and ensure training and rehabilitation goals are achieved. This study sought to develop and evaluate deadlift exercise technique classification systems utilising Inertial Measurement Units (IMUs), recording at 51.2Hz, worn on the lumbar spine, both thighs and both shanks. It also sought to compare classification quality when these IMUs are worn in combination and in isolation...
May 16, 2017: Journal of Biomechanics
https://www.readbyqxmd.com/read/28544940/directional-preference-of-activation-of-abdominal-and-paraspinal-muscles-during-position-control-tasks-in-sitting
#15
Martin Eriksson Crommert, Kylie Tucker, Christopher Holford, Alexander Wight, Donna McCook, Paul Hodges
Controversy exists in the literature regarding antagonist activity of trunk muscles during different types of trunk loading, and the direction-specificity of activation of trunk muscles, particularly the deeper trunk muscles. This study aimed to systematically compare activation of a range of trunk muscles between directions of statically applied loads, and to consider the impact of breathing in this activation. In a semi-seated position, 13 healthy male participants resisted moderate inertial loads applied to the trunk in eight different directions...
August 2017: Journal of Electromyography and Kinesiology
https://www.readbyqxmd.com/read/28538317/effects-of-inertial-setting-on-power-force-work-and-eccentric-overload-during-flywheel-resistance-exercise-in-women-and-men
#16
Luis M Martinez-Aranda, Rodrigo Fernandez-Gonzalo
Exercise load is a key component in determining end-point adaptations to resistance exercise. Yet, there is no information regarding the use of different inertia (i.e., loads) during isoinertial flywheel resistance exercise, a very popular high-intensity training model. Thus, this study examined power, work, force, and eccentric overload produced during flywheel resistance exercise with different inertial settings in men and women. Twenty-two women (n = 11) and men (n = 11) performed unilateral (in both legs) isolated concentric (CON) and coupled CON and eccentric (ECC) exercise in a flywheel knee extension device employing 6 inertias (0...
June 2017: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/28523981/classification-of-lunge-biomechanics-with-multiple-and-individual-inertial-measurement-units
#17
Martin A O'Reilly, Darragh F Whelan, Tomas E Ward, Eamonn Delahunt, Brian Caulfield
Lunges are a common, compound lower limb resistance exercise. If completed with aberrant technique, the increased stress on the joints used may increase risk of injury. This study sought to first investigate the ability of inertial measurement units (IMUs), when used in isolation and combination, to (a) classify acceptable and aberrant lunge technique (b) classify exact deviations in lunge technique. We then sought to investigate the most important features and establish the minimum number of top-ranked features and decision trees that are needed to maintain maximal system classification efficacy...
September 2017: Sports Biomechanics
https://www.readbyqxmd.com/read/28496410/clinical-applications-of-iso-inertial-eccentric-overload-yoyo%C3%A2-resistance-exercise
#18
REVIEW
Per A Tesch, Rodrigo Fernandez-Gonzalo, Tommy R Lundberg
In the quest for a viable non-gravity dependent method to "lift weights" in space, our laboratory introduced iso-inertial resistance (YoYo™) exercise using spinning flywheel(s), more than 25 years ago. After being thoroughly tested in individuals subjected to various established spaceflight analogs, a multi-mode YoYo™ exercise apparatus was eventually installed on the International Space Station in 2009. The method, applicable to any muscle group, provides accommodated resistance and optimal muscle loading through the full range of motion of concentric actions, and brief episodes of eccentric overload...
2017: Frontiers in Physiology
https://www.readbyqxmd.com/read/28432739/effect-of-a-4-week-elastic-resistance-band-training-regimen-on-back-kinematics-in-horses-trotting-in-hand-and-on-the-lunge
#19
T Pfau, V Simons, N Rombach, N Stubbs, R Weller
BACKGROUND: Training and rehabilitation techniques aiming at improving core muscle strength may result in increased dynamic stability of the equine vertebral column. A system of elastic resistance bands is suggested to provide proprioceptive feedback during motion to encourage recruitment of core abdominal and hindquarter musculature for improved dynamic stability. OBJECTIVES: To quantify the effects of a specific resistance band system on back kinematics during trot in-hand and lungeing at beginning and end of a 4-week exercise programme...
April 22, 2017: Equine Veterinary Journal
https://www.readbyqxmd.com/read/28361893/shock-resistibility-of-mems-based-inertial-microswitch-under-reverse-directional-ultra-high-g-acceleration-for-iot-applications
#20
Qiu Xu, Zhuoqing Yang, Yunna Sun, Liyan Lai, Zhiyu Jin, Guifu Ding, Xiaolin Zhao, Jinyuan Yao, Jing Wang
This paper presents a novel MEMS-based inertial microswitch design with multi-directional compact constraint structures for improving the shock-resistibility. Its shock-resistibility in the reverse-sensitive direction to ultra-high g acceleration (~hunderds of thousands) is simulated and analyzed. The dynamic response process indicates that in the designed inertial microswitch the proof mass weight G, the whole system's stiffness k and the gap x2 between the proof mass and reverse constraint blocks have significant effect on the shock-resistibility...
March 31, 2017: Scientific Reports
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