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https://www.readbyqxmd.com/read/29778761/preferential-stabilization-of-newly-formed-dendritic-spines-in-motor-cortex-during-manual-skill-learning-predicts-performance-gains-but-not-memory-endurance
#1
Taylor A Clark, Min Fu, Andrew K Dunn, Yi Zuo, Theresa A Jones
Previous findings that skill learning is associated with the formation and preferential stabilization of new dendritic spines in cortex have raised the possibility that this preferential stabilization is a mechanism for lasting skill memory. We investigated this possibility in adult mice using in vivo two-photon imaging to monitor spine dynamics on superficial apical dendrites of layer V pyramidal neurons in motor cortex during manual skill learning. Spine formation increased over the first 3 days of training on a skilled reaching task, followed by increased spine elimination...
May 17, 2018: Neurobiology of Learning and Memory
https://www.readbyqxmd.com/read/29777386/substrate-metabolism-during-ironman-triathlon-different-horses-on-the-same-courses
#2
Ed Maunder, Andrew E Kilding, Daniel J Plews
Ironman triathlons are ultra-endurance events of extreme duration. The performance level of those competing varies dramatically, with elite competitors finishing in ~ 8:00:00, and lower performing amateurs finishing in ~ 14-15:00:00. When applying appropriate values for swimming, cycling and running economies to these performance times, it is demonstrated that the absolute energy cost of these events is high, and the rate of energy expenditure increases in proportion with the athlete's competitive level...
May 18, 2018: Sports Medicine
https://www.readbyqxmd.com/read/29776561/circulating-micrornas-as-emerging-cardiac-biomarkers-responsive-to-acute-exercise
#3
David de Gonzalo-Calvo, Alberto Dávalos, Manuel Fernández-Sanjurjo, Laura Amado-Rodríguez, Susana Díaz-Coto, Cristina Tomás-Zapico, Ana Montero, Ángela García-González, Vicenta Llorente-Cortés, Maria Eugenia Heras, Araceli Boraita Pérez, Ángel E Díaz-Martínez, Natalia Úbeda, Eduardo Iglesias-Gutiérrez
BACKGROUND: Circulating microRNAs (c-miRNAs) are mediators of intercellular communication with great potential as cardiac biomarkers. The analysis of c-miRNAs in response to physiological stress, such as exercise, would provide valuable information for clinical practice and a deeper understanding of the molecular response to physical activity. Here, we analysed for the first time the acute exercise response of c-miRNAs reported as biomarkers of cardiac disease in a well-characterized cohort of healthy active adults...
August 1, 2018: International Journal of Cardiology
https://www.readbyqxmd.com/read/29776531/an-evaluation-of-a-college-campus-emergency-preparedness-intervention
#4
Christofer Skurka, Brian L Quick, Tobias Reynolds-Tylus, Todd Short, Ann L Bryan
INTRODUCTION: Given the range of emergencies that beset postsecondary institutions, university administrators must take a multimodal approach to prepare campus stakeholders for safety threats. One such strategy is emergency preparedness communication. METHODS: In the present investigation, we tested the efficacy of a professionally produced video that uses the federally endorsed slogan, Run-Hide-Fight(r). Undergraduate students participated in a quasi-experiment with a pretest-posttest-delayed posttest control group design...
June 2018: Journal of Safety Research
https://www.readbyqxmd.com/read/29776425/combined-application-of-latissimus-dorsi-myocutaneous-flap-and-iliac-bone-flap-in-the-treatment-of-chronic-osteomyelitis-of-the-lower-extremity
#5
Jihui Ju, Lei Li, Rong Zhou, Ruixing Hou
BACKGROUND: To evaluate the clinical efficacy and safety of latissimus dorsi myocutaneous flap (stage I) combined with iliac bone flap (stage II) in the treatment of chronic osteomyelitis of the lower extremity. METHODS: Clinical data of 18 patients undergoing latissimus dorsi myocutaneous flap in combination with iliac bone flap grafting were retrospectively analyzed. Among them, 2 patients developed chronic osteomyelitis of the lower segment of the femur, 4 were diagnosed with chronic osteomyelitis of the tibial plateau, and 12 with chronic osteomyelitis of the lower segment of the tibia...
May 18, 2018: Journal of Orthopaedic Surgery and Research
https://www.readbyqxmd.com/read/29775800/insertion-and-presence-of-fine-wire-intramuscular-electrodes-to-the-lumbar-paraspinal-muscles-do-not-affect-muscle-performance-and-activation-during-high-exertion-spinal-extension-activities
#6
Szu-Ping Lee, Jo Armour Smith, Matthew Kimber, Kelsey Houk
BACKGROUND: Low back pain (LBP) is commonly associated with paraspinal muscle dysfunctions. A method to study deep lumbar paraspinal (i.e. multifidus) muscle function and neuromuscular activation pattern is intramuscular electromyography (EMG). Previous studies have shown that the procedure does not significantly impact muscle function during activities involving low-level muscle contractions. However, it is currently unknown how muscular function and activation are affected during high-exertion contractions...
May 15, 2018: PM & R: the Journal of Injury, Function, and Rehabilitation
https://www.readbyqxmd.com/read/29775483/ldha-gene-is-associated-with-pigeon-survivability-during-racing-competitions
#7
Sherif Ramadan, Takeshi Miyake, Junichi Yamaura, Miho Inoue-Murayama
Pigeon racing is a popular sport worldwide. Pigeons are under continuous selection to improve speed, spatial orientation, and endurance during long flights. However, numerous genetic and non-genetic factors affect survivability and homing ability, making such traits difficult for breeders to control. Polymorphisms in the lactate dehydrogenase A gene (LDHA) likely affects pigeon racing and homing abilities, due to its role in physical and mental performance. Additionally, the adenylate cyclase activating polypeptide 1 gene (ADCYAP1) has been associated with physiological and behavioral shifts that occur during avian migration...
2018: PloS One
https://www.readbyqxmd.com/read/29775379/decision-to-return-to-sport-participation-after-anterior-cruciate-ligament-reconstruction-part-ii-self-reported-and-functional-performance-outcomes
#8
Jennifer L Werner, Julie P Burland, Carl G Mattacola, Jenny Toonstra, Robert A English, Jennifer S Howard
CONTEXT:   Anterior cruciate ligament (ACL) reconstruction (ACLR) is the most commonly used method for helping athletes regain function and return to preinjury activity levels after ACL injury. Outcomes after ACLR have suggested that athletes return to a level of function that would support a return to sport participation; however, in a recent meta-analysis, pooled return rates were only 55%. It is unclear whether this discrepancy is a result of functional impairments. OBJECTIVE:   To compare patient-reported outcomes (PROs), dynamic balance, dynamic functional performance, strength, and muscular endurance in athletes who have returned to sport (RTS) and athletes who have not returned to sport (NRTS) after ACLR...
May 18, 2018: Journal of Athletic Training
https://www.readbyqxmd.com/read/29774612/elastic-fiber-supercapacitors-for-wearable-energy-storage
#9
REVIEW
Si Qin, Shayan Seyedin, Jizhen Zhang, Zhiyu Wang, Fangli Yang, Yuqing Liu, Jun Chen, Joselito M Razal
The development of wearable devices such as smart watches, intelligent garments, and wearable health-monitoring devices calls for suitable energy storage devices which have matching mechanical properties and can provide sufficient power for a reasonable duration. Stretchable fiber-based supercapacitors are emerging as a promising candidates for this purpose because they are lightweight, flexible, have high energy and power density, and the potential for easy integration into traditional textile processes. An important characteristic that is oftentimes ignored is stretchability-fiber supercapacitors should be able to accommodate large elongation during use, endure a range of bending motions, and then revert to its original form without compromising electrical and electrochemical performance...
May 17, 2018: Macromolecular Rapid Communications
https://www.readbyqxmd.com/read/29773412/athlete-s-heart-is-the-morganroth-hypothesis-obsolete
#10
Mark J Haykowsky, T Jake Samuel, Michael D Nelson, Andre La Gerche
In 1975, Morganroth and colleagues reported that the increased left ventricular (LV) mass in highly trained endurance athletes versus nonathletes was primarily due to increased end-diastolic volume while the increased LV mass in resistance trained athletes was solely due to an increased LV wall thickness. Based on the divergent remodelling patterns observed, Morganroth and colleagues hypothesised that the increased "volume" load during endurance exercise may be similar to that which occurs in patients with mitral or aortic regurgitation while the "pressure" load associated with performing a Valsalva manoeuvre (VM) during resistance exercise may mimic the stress imposed on the heart by systemic hypertension or aortic stenosis...
May 1, 2018: Heart, Lung & Circulation
https://www.readbyqxmd.com/read/29769820/multivariate-relationships-among-morphology-fitness-and-motor-coordination-in-prepubertal-girls
#11
Leonardo G O Luz, Manuel J Coelho-E-Silva, João P Duarte, João Valente-Dos-Santos, Aristides Machado-Rodrigues, André Seabra, Bruno C M Carmo, Roel Vaeyens, Renaat M Philippaerts, Sean P Cumming, Robert M Malina
Motor coordination and physical fitness are multidimensional concepts which cannot be reduced to a single variable. This study evaluated multivariate relationships among morphology, physical fitness and motor coordination in 74 pre-pubertal girls 8.0-8.9 years of age. Data included body dimensions, eight fitness items and four motor coordination tasks (KTK battery). Maturity status was estimated as percentage of predicted mature stature attained at the time of observation. Canonical correlation analysis was used to examine the relationships between multivariate domains...
June 2018: Journal of Sports Science & Medicine
https://www.readbyqxmd.com/read/29769816/the-effect-of-two-different-concurrent-training-programs-on-strength-and-power-gains-in-highly-trained-individuals
#12
Henrik Petré, Pontus Löfving, Niklas Psilander
The effects of concurrent strength and endurance training have been well studied in untrained and moderately-trained individuals. However, studies examining these effects in individuals with a long history of resistance training (RT) are lacking. Additionally, few studies have examined how strength and power are affected when different types of endurance training are added to an RT protocol. The purpose of the present study was to compare the effects of concurrent training incorporating either low-volume, high-intensity interval training (HIIT, 8-24 Tabata intervals at ~150% of VO2max ) or high-volume, medium-intensity continuous endurance training (CT, 40-80 min at 70% of VO2max ), on the strength and power of highly-trained individuals...
June 2018: Journal of Sports Science & Medicine
https://www.readbyqxmd.com/read/29765698/the-epidemiology-of-hepatitis-c-virus-in-pakistan-systematic-review-and-meta-analyses
#13
Zaina Al Kanaani, Sarwat Mahmud, Silva P Kouyoumjian, Laith J Abu-Raddad
To characterize hepatitis C virus (HCV) epidemiology in Pakistan and estimate the pooled mean HCV antibody prevalence in different risk populations, we systematically reviewed all available records of HCV incidence and/or prevalence from 1989 to 2016, as informed by the Cochrane Collaboration Handbook. This systematic review was reported following the PRISMA guidelines. Populations were classified into six categories based on the risk of exposure to HCV infection. Meta-analyses were performed using DerSimonian and Laird random-effects models with inverse variance weighting...
April 2018: Royal Society Open Science
https://www.readbyqxmd.com/read/29765176/impairments-of-postural-control-functional-performance-and-strength-in-morbidly-obese-patients-awaiting-bariatric-surgery-in-comparison-to-healthy-individuals
#14
Max Lennart Eckstein, Jimmy Bradley Lawrence, Christoph Otto, Peggy Kotsch, Janin Messerschmidt, Richard Michael Bracken, Othmar Moser
[Purpose] There is a lack of information evaluating specific markers of performance in patients awaiting bariatric surgery. We aimed to assess the postural control, functional performance, strength and endurance performance for morbidly obese patients awaiting bariatric surgery compared to lean controls. [Subjects and Methods] All parameters were assessed by modified Y-balance test, timed-up-and-go-test, maximum strength testing on resistance exercise equipment and cardio-pulmonary exercise testing on a cycle ergometer in 10 morbidly obese patients awaiting bariatric surgery and 10 age- and sex-matched lean controls...
May 2018: Journal of Physical Therapy Science
https://www.readbyqxmd.com/read/29762540/the-role-of-peroxisome-proliferator-activated-receptors-and-their-transcriptional-coactivators-gene-variations-in-human-trainability-a-systematic-review
#15
REVIEW
Miroslav Petr, Petr Stastny, Adam Zajac, James J Tufano, Agnieszka Maciejewska-Skrendo
BACKGROUND: The peroxisome proliferator-activated receptors ( PPARA , PPARG , PPARD ) and their transcriptional coactivators' ( PPARGC1A , PPARGC1B ) gene polymorphisms have been associated with muscle morphology, oxygen uptake, power output and endurance performance. The purpose of this review is to determine whether the PPARs and/or their coactivators' polymorphisms can predict the training response to specific training stimuli. METHODS: In accordance with the Preferred Reporting Items for Systematic Reviews and Meta Analyses, a literature review has been run for a combination of PPARs and physical activity key words...
May 15, 2018: International Journal of Molecular Sciences
https://www.readbyqxmd.com/read/29757053/applying-a-low-fodmap-dietary-intervention-to-a-female-ultra-endurance-runner-with-irritable-bowel-syndrome-during-a-multi-stage-ultra-marathon
#16
Stephanie K Gaskell, Ricardo J S Costa
Malabsorption of Fermentable Oligo- Di- and Mono-saccharides and Polyols (FODMAPs) in response to prolonged exercise may increase incidence of upper- and lower-gastrointestinal symptoms (GIS), which are known to impair exercise performance. The case-study aimed to explore the impact of a low-FODMAP diet on exercise-associated GIS in a female ultra-endurance runner diagnosed with irritable bowel syndrome (IBS), competing in a six-day 186.7 km mountainous multi-stage ultra-marathon (MSUM). IBS symptom severity score at diagnosis was 410 and following a low-FODMAP diet (3...
May 14, 2018: International Journal of Sport Nutrition and Exercise Metabolism
https://www.readbyqxmd.com/read/29756638/sex-differences-in-diaphragmatic-fatigue-the-cardiovascular-response-to-inspiratory-resistance
#17
Joseph F Welch, Bruno Archiza, Jordan A Guenette, Christopher R West, A William Sheel
KEY POINTS: Diaphragmatic fatigue (DF) elicits a sympathetically mediated metaboreflex resulting in increased heart rate, blood pressure and limb vascular resistance. Women may be more resistant to DF compared to men and therefore, it was hypothesised that women would experience an attenuated inspiratory muscle metaboreflex during inspiratory pressure-threshold loading (PTL) performed to task failure. At the time of PTL task failure, the severity of DF was not different between sexes; however, inspiratory muscle endurance time was significantly longer in women than men...
May 14, 2018: Journal of Physiology
https://www.readbyqxmd.com/read/29756441/multi-responsive-kinematics-and-robotics-of-surface-patterned-polymer-film
#18
Shumin Liang, Xiaxin Qiu, Jun Yuan, Wei Huang, Xuemin Du, Lidong Zhang
Soft robots, sensors and energy harvesters require materials that are capable of converting external stimuli to visible deformations, and especially shape-programmable deformations are desired. Herein, we develop a polymer film that can reversibly respond to humidity, heating and acetone vapors with generation of shape-programmable large deformations. Polyvinylidene fluoride (PVDF) film, capable of providing acetone responsiveness, is designed with microchannel patterns on one side by using templates, and the microchannels-patterned side is then treated with hygroscopic 3-aminopropyltriethoxysilane (APTES) to give humidity/heating-responsive elements...
May 14, 2018: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/29753800/effect-of-sexual-intercourse-on-lower-extremity-muscle-force-in-strength-trained-men
#19
Leah M Valenti, Claudia Suchil, Gabriel Beltran, Roman C Rogers, Emily A Massey, Todd A Astorino
BACKGROUND: Sex has been deemed taboo for athletic performance going back to ancient Rome and Greece, as the act of sex was thought to promote ease and a sense of relaxation. AIM: This study examined the effect of sexual intercourse completed 12 hours before a bout of isokinetic dynamometry on muscle force production in strength-trained men. METHODS: 12 Healthy physically active men (age = 25.6 ± 3.8 years) who were sexually active participated in this study...
May 9, 2018: Journal of Sexual Medicine
https://www.readbyqxmd.com/read/29753547/an-analysis-of-casualties-presenting-to-military-emergency-departments-in-iraq-and-afghanistan
#20
Steven G Schauer, Jason F Naylor, Joshua J Oliver, Joseph K Maddry, Michael D April
BACKGROUND: During the past 17 years of conflict the deployed US military health care system has found new and innovative ways to reduce combat mortality down to the lowest case fatality rate in US history. There is currently a data dearth of emergency department (ED) care delivered in this setting. We seek to describe ED interventions in this setting. METHODS: We used a series of ED procedure codes to identify subjects within the Department of Defense Trauma Registry from January 2007 to August 2016...
May 2, 2018: American Journal of Emergency Medicine
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