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https://www.readbyqxmd.com/read/27921999/lift-calculations-based-on-accepted-wake-models-for-animal-flight-are-inconsistent-and-sensitive-to-vortex-dynamics
#1
Eric Gutierrez, Daniel B Quinn, Diana D Chin, David Lentink
There are three common methods for calculating the lift generated by a flying animal based on the measured airflow in the wake. However, these methods might not be accurate according to computational and robot-based studies of flapping wings. Here we test this hypothesis for the first time for a slowly flying Pacific parrotlet in still air using stereo particle image velocimetry recorded at 1000 Hz. The bird was trained to fly between two perches through a laser sheet wearing laser safety goggles. We found that the wingtip vortices generated during mid-downstroke advected down and broke up quickly, contradicting the frozen turbulence hypothesis typically assumed in animal flight experiments...
December 6, 2016: Bioinspiration & Biomimetics
https://www.readbyqxmd.com/read/27900228/xiphoidectomy-a-surgical-intervention-for-an-underdocumented-disorder
#2
Dirk Pieter Hogerzeil, Klaas Albert Hartholt, Mark Rem de Vries
Two patients who presented with nonspecific thoracic and upper abdominal symptoms and tenderness of the xiphoid process are discussed. Both patients had undergone extensive examinations, but no source for their symptoms could be found. Plain chest radiographs revealed an anterior displacement of the xiphoid process in both patients. Physical examination confirmed this to be the primary source of discomfort. Anterior displacement of the xiphoid process may be the result of significant weight gain. Repeated trauma of the afflicted area, unaccustomed heavy lifting, exercise, and perichondritis are, amongst other causes, believed to contribute to the development of xiphodynia...
2016: Case Reports in Surgery
https://www.readbyqxmd.com/read/27893476/comparison-of-muscle-involvement-and-posture-between-the-conventional-deadlift-and-a-walk-in-style-deadlift-machine
#3
Benjamin J Snyder, Courtney P Cauthen, Scott R Senger
The deadlift exercise is one of the most effective exercises for developing lower-body strength; however, technique errors can lead to low back injuries. The use of a 'walk-in' deadlift machine removes the weight bar by using a lever system with independent handles on either side of the body. Theoretically, this would allow alignment of the load with the center of gravity, encouraging a more upright torso and decreasing the involvement of the low back extensors. This study compared trunk angle, knee angle and electrical activity of key muscles between the conventional deadlift (CDL) and two foot positions (ball of foot or toe alignment) with pronated grip, (called BallPro and ToePro) of a walk-in deadlift machine among high-skilled and low-skilled lifters...
November 16, 2016: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/27880779/a-mighty-claw-pinching-force-of-the-coconut-crab-the-largest-terrestrial-crustacean
#4
Shin-Ichiro Oka, Taketeru Tomita, Kei Miyamoto
Crustaceans can exert a greater force using their claws than many animals can with other appendages. Furthermore, in decapods, the chela is a notable organ with multifunctional roles. The coconut crab, Birgus latro, is the largest terrestrial crustacean and has a remarkable ability to lift weights up to approximately 30 kg. However, the pinching force of this crab's chelae has not been previously investigated. In the present study, we measured the pinching force of the chelae in 29 wild coconut crabs (33-2,120 g in body weight)...
2016: PloS One
https://www.readbyqxmd.com/read/27875493/acute-lumbar-paraspinal-myonecrosis-in-football-players-with-sickle-cell-trait-a-case-series
#5
E Randy Eichner, Brock Schnebel, Scott Anderson, James R Clugston, Heath Hale, Charlie Michaudet, John M Small
We report 6 cases of a novel syndrome of acute, exertional low back pain (LBP) in football players, 5 in college and one in the National Football League (NFL). All 6 are African-Americans with sickle cell trait (SCT). The acute LBP is severe and can be disabling, and the condition can be confused with muscle strain, discogenic pain, stress fracture, or other problems in athletes. Our evidence shows that this syndrome is caused by lumbar paraspinal myonecrosis (LPSMN), which likely often contributes to the lumbar paraspinal compartment syndrome...
November 21, 2016: Medicine and Science in Sports and Exercise
https://www.readbyqxmd.com/read/27860135/joint-lavage-followed-by-viscosupplementation-and-triamcinolone-in-patients-with-severe-haemophilic-arthropathy-objective-functional-results
#6
M U Rezende, F R Andrusaitis, R T Silva, E Okazaki, J D A Carneiro, G C Campos, A F Pailo, R Frucchi, T Pasqualin, P R Villaça
INTRODUCTION: Viscosupplementation can improve function in haemophilia patients. Viscosupplementation results can be improved by prior joint lavage and triamcinolone administration. AIM: To objectively assess whether viscosupplementation and associated triamcinolone use in patients with severe haemophilic arthropathy following joint lavage improves force and balance and reduces bleeding events. METHODS: Fourteen patients with haemophilic knee arthritis with and without the involvement of other joints underwent joint lavage and subsequent injections of Hylan G-F20 and triamcinolone into all affected joints...
November 16, 2016: Haemophilia: the Official Journal of the World Federation of Hemophilia
https://www.readbyqxmd.com/read/27849479/heavy-loads-and-lifting-are-risk-factors-for-musculoskeletal-injuries-in-deployed-female-soldiers
#7
Tanja C Roy, Sara R Piva, Bryan C Christiansen, Jonathan D Lesher, Peter M Doyle, Rachel M Waring, James J Irrgang, Charity G Moore, Teresa L Brininger, Marilyn A Sharp
The purpose of this prospective cohort study was to investigate physical, occupational, and psychosocial risk factors for musculoskeletal injuries (MSI) in deployed female soldiers. Before deployment, participants completed performance testing and surveys and after deployment an additional survey detailing occupational demands and MSI. Data analyzed found 57/160 (36%) suffered 78 MSI. In unadjusted analyses, these factors increased the relative risk (RR, 95% confidence interval) of injury: wearing an average load >10% body weight (BW) (RR = 2...
November 2016: Military Medicine
https://www.readbyqxmd.com/read/27824690/hypertension-during-weight-lifting-reduces-flow-mediated-dilation-in-nonathletes
#8
Cullen E Buchanan, Andrew O Kadlec, Anne Z Hoch, David D Gutterman, Matthew J Durand
PURPOSE: The purpose of this study was to determine if increased intraluminal pressure is the damaging factor which reduces flow mediated dilation (FMD) in young, healthy subjects following resistance exercise to maximal exertion. HYPOTHESIS: Attenuating the rise in brachial artery pressure during weight lifting by placing a blood pressure cuff on the upper arm prevents post-exercise impairment of brachial artery FMD in sedentary individuals. METHODS: Nine sedentary individuals who exercise ≤1 time/week and six exercise-trained individuals who exercise ≥3 times/week performed leg press exercise to maximal exertion on two separate occasions...
November 7, 2016: Medicine and Science in Sports and Exercise
https://www.readbyqxmd.com/read/27806005/effect-of-1-rm-80-rm-and-50-rm-strength-exercise-in-trained-individuals-on-variations-in-plasma-redox-biomarkers
#9
Tatiana G Polotow, Tácito P Souza-Junior, Ricardo C Sampaio, Alexandre R Okuyama, Douglas Ganini, Cristina V Vardaris, Ragami C Alves, Steven R McAnulty, Marcelo P Barros
For decades, scientists have examined the participation of oxygen/nitrogen species (ROS/RNS) in anaerobic-like exercises, especially weight lifting and resistance exercises. The balance between the production of oxyradicals and antioxidant responses during anaerobic-like exercises is essential to assure adaptation to the physiological benefits of strength training and to prevent chronic harmful effects. The aim of this study is to examine the hypothesis that different weight loads (1-RM, 80%RM, and 50%RM) lifted until exhaustion could impose distinct oxidative insults and elicit diverse antioxidant responses in plasma of young trained subjects...
October 27, 2016: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/27796000/plasma-stress-responses-in-juvenile-red-spotted-grouper-epinephelus-akaara-exposed-to-abrupt-salinity-decrease
#10
Jang-Won Lee, Hyung Bae Kim, Hea Ja Baek
The objective of the current study was to determine acute plasma stress responses in two size groups of juvenile Epinephelus akaara (average body weight: 8.4±2.1 and 3.3±0.6 g; 150 and 120 days after hatch, respectively) exposed to abrupt salinity drops (from 34 practical salinity unit, PSU seawater to 18, 10 PSU (experiment 1) or 26, 18, 10 PSU (experiment 2), respectively). Plasma glucose, glutamic oxalate transaminase, glutamic pyruvate transaminase, red blood cell counts, and gill histology were determined during 72 h exposure...
September 2016: Balsaeng'gwa Saengsig
https://www.readbyqxmd.com/read/27784953/injury-surveillance-and-safety-considerations-for-large-format-lead-acid-batteries-used-in-mining-applications
#11
Miguel Angel Reyes, Thomas Novak
Large lead-acid batteries are predominantly used throughout the mining industry to power haulage, utility, and personnel-carrier vehicles. Without proper operation and maintenance, the use of these batteries can introduce mechanical and electrical hazards, particularly in the confined, and potentially dangerous, environment of an underground coal mine. A review of the Mine Safety and Health Administration accident/illness/injury database reveals that a significant number of injuries occur during the maintenance and repair of lead-acid batteries...
March 2016: IEEE Transactions on Industry Applications
https://www.readbyqxmd.com/read/27777820/midterm-results-of-semiconstrained-distal-radioulnar-joint-arthroplasty-and-analysis-of-complications
#12
L Reissner, K Böttger, H J Klein, M Calcagni, T Giesen
Range of motion and stability are important outcome parameters to assess function of the distal radioulnar joint (DRUJ), in particular pronation, supination, and weight-lifting capacity. The DRUJ semiconstrained implant developed by Scheker et al is intended to reproduce all the functions of the triangular fibrocartilage complex and the DRUJ. The aim of the study was to investigate the subjective, clinical, and radiographic results in 10 patients after primary implantation of the semiconstrained DRUJ arthroplasty following DRUJ derangement and painful instability, with an average follow-up of 3 years with a special focus on the complications...
November 2016: Journal of Wrist Surgery
https://www.readbyqxmd.com/read/27766155/gill-structural-change-in-response-to-turbidity-has-no-effect-on-the-oxygen-uptake-of-a-juvenile-sparid-fish
#13
H Cumming, N A Herbert
Turbidity as a result of increased suspended sediments in coastal waters is an environmental stress of worldwide concern. Recent research on fish suggests that detrimental changes to gill structure can occur in turbid waters, with speculation that these alterations diminish fitness variables, such as growth and development, by negatively impacting the O2 uptake capacity (respiration) of fish. Specifically to address this unknown, the impact of turbid water on the gill structure, somatic growth rate and O2 uptake rates of a juvenile sparid species (Pagrus auratus) was addressed following exposure to five different turbidity treatments (<10, 20, 40, 60 or 80 nephelometric turbidity units) for 30 days...
2016: Conservation Physiology
https://www.readbyqxmd.com/read/27760821/does-the-sensorimotor-system-minimize-prediction-error-or-select-the-most-likely-prediction-during-object-lifting
#14
Joshua G A Cashaback, Heather R McGregor, Henry C H Pun, Gavin Buckingham, Paul L Gribble
The human sensorimotor system is routinely capable of making accurate predictions about an object's weight, which allows for energetically efficient lifts and prevents objects from being dropped. Often however, poor predictions arise when the weight of an object can vary and sensory cues about object weight are sparse (e.g., picking up an opaque water bottle). The question arises, what strategies does the sensorimotor system use to make weight predictions when dealing with an object whose weight may vary? For example, does the sensorimotor system use a strategy that minimizes prediction error (minimal squared error) or one that selects the weight that is most likely to be correct (maximum a posteriori)? Here we dissociated the predictions of these two strategies by having participants lift an object whose weight varied according to a skewed probability distribution...
October 19, 2016: Journal of Neurophysiology
https://www.readbyqxmd.com/read/27757346/complications-of-lower-body-lift-surgery-in-postbariatric-patients
#15
Ingrid G M Poodt, Martine M van Dijk, Steven Klein, Maarten M Hoogbergen
: There is an exponential rise of patients with massive weight loss because of bariatric surgery or lifestyle changes. The result is an increase of patients with folds of redundant skin that may cause physical and psychological problems. The lower body lift is a procedure to correct deformities in the abdomen, mons, flanks, lateral thighs, and buttocks. Complication rates are quite high and could negatively affect the positive outcomes. The purpose of this study is to assess complication rates and to identify predictors of complications to optimize outcomes for patients after lower body lift surgery...
September 2016: Plastic and Reconstructive Surgery. Global Open
https://www.readbyqxmd.com/read/27753997/ed-07-2-to-lift-walk-or-run-what-is-the-optimal-mode-of-exercise-to-reduce-hypertension-and-prevent-cardiovascular-disease
#16
Peter Kokkinos
A plethora of evidence exists supporting that structured aerobic exercise or activities that increase cardiorespiratory fitness (CRF) lower resting blood pressure (BP) in patients with hypertension (HTN). Relatively few studies have assessed the effects of anaerobic or resistance exercise on BP. Thus, its role in managing HTN is not defined. Also, possible risks related with exercise in hypertensive patients have not been adequately addressed.In addition to lowering BP, CRF attenuates the incidence of HTN. A substantial part of the age-related progression to HTN is not an inevitable outcome of aging as once thought, but a consequence of lifestyle characterized by high-fat/salt diets and physical inactivity...
September 2016: Journal of Hypertension
https://www.readbyqxmd.com/read/27749469/protective-determinants-of-sickness-absence-among-employees-with-multisite-pain-a-7-year-follow-up
#17
Eija Haukka, Anneli Ojajärvi, Leena Kaila-Kangas, Päivi Leino-Arjas
We identified factors protective of all-cause sickness absence (SA) among subjects with multisite musculoskeletal pain (MSP). The nationally representative source sample comprised 3420 actively working Finns aged 30-55 in year 2000 and alive at follow-up. Pain in 18 body locations was combined into four sites (neck, low back, upper limbs, lower limbs). The baseline prevalence of MSP (pain in ≥ 2 sites) was 32 %. Baseline data on sociodemographic factors, work ability, work, health, and lifestyle were gathered by questionnaire, interview and clinical examination and linked with national registers on all-cause SA (periods lasting ≥10 workdays) for 2002-2008...
October 3, 2016: Pain
https://www.readbyqxmd.com/read/27743260/contribution-of-surface-material-and-size-to-the-expected-versus-the-perceived-weight-of-objects
#18
Michele Vicovaro, Luigi Burigana
Because the perceived weight of objects may be affected by various nonweight properties, such as their size and the density of their surface material, relative weight is sometimes misperceived (the size-weight illusion and the material-weight illusion, respectively). A widely accepted explanation for weight illusions is provided by the so-called expectation model, according to which the perceived weight stems from the contrast between the actual and expected weights. In the present study, we varied both the surface material and the size of stimuli, while keeping constant their physical weights...
October 14, 2016: Attention, Perception & Psychophysics
https://www.readbyqxmd.com/read/27743157/modifiable-factors-in-the-management-of-glaucoma-a-systematic-review-of-current-evidence
#19
Idan Hecht, Asaf Achiron, Vitaly Man, Zvia Burgansky-Eliash
PURPOSE: Primary open angle glaucoma is a chronic optic neuropathy affecting millions of people worldwide and represents a major public health issue. Environmental factors, behaviors, and diet are intimately related to patient health and may play a role in the pathogenesis and progression of glaucoma. This study aims to review the literature, focusing on the last three years, regarding modifiable lifestyle interventions in the management of primary open angle glaucoma. METHODS: Electronic databases were searched for studies published between January 2013 and July 2016 on the topic of lifestyle interventions in primary open angle glaucoma...
October 14, 2016: Graefe's Archive for Clinical and Experimental Ophthalmology
https://www.readbyqxmd.com/read/27741049/plastic-and-reconstructive-surgery-contribution-of-lower-body-lift-in-the-correction-of-medial-thigh-deformity-following-massive-weight-loss
#20
Alan Matarasso
No abstract text is available yet for this article.
October 6, 2016: Plastic and Reconstructive Surgery
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