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https://www.readbyqxmd.com/read/29671875/atrial-remodeling-and-ectopic-burden-in-recreational-athletes-implications-for-risk-of-atrial-fibrillation
#1
Adrian D Elliott, Rajiv Mahajan, Dominik Linz, Michael Stokes, Christian V Verdicchio, Melissa E Middeldorp, Andre La Gerche, Dennis H Lau, Prashanthan Sanders
BACKGROUND: Atrial remodeling, vagal tone and atrial ectopic triggers have been suggested to contribute to the increased incidence of atrial fibrillation (AF) in endurance athletes. How these parameters change with increased lifetime training hours is debated. HYPOTHESIS: We hypothesised that atrial remodeling occurs in proportion to total training history, thus contributing to the elevated risk of AF. METHODS: We recruited 99 recreational endurance athletes, subsequently grouped according to lifetime training hours, to undergo evaluation of atrial size, autonomic modulation and atrial ectopy...
April 19, 2018: Clinical Cardiology
https://www.readbyqxmd.com/read/29659723/age-related-slowing-of-contractile-properties-differs-between-power-endurance-and-non-athletes-a-tensiomyographic-assessment
#2
Boštjan Šimunic, Rado Pišot, Jörn Rittweger, Hans Degens
Although master athletes maintain high levels of physical activity, they also suffer from an age-related decline in skeletal muscle function. There are indications of disproportional age- and physical inactivity-induced muscle wasting between muscles. Tensiomyography is a non-invasive tool that has been used to study the effects of a variety of sports on the contraction time (Tc) in different skeletal muscles. The aim of this cross-sectional study was to assess age-related changes in the Tc of the vastus lateralis, gastrocnemius medialis and biceps femoris muscles with Tensiomyography in older non-athletes (age = 62...
April 12, 2018: Journals of Gerontology. Series A, Biological Sciences and Medical Sciences
https://www.readbyqxmd.com/read/29651131/low-level-mitochondrial-heteroplasmy-modulates-dna-replication-glucose-metabolism-and-lifespan-in-mice
#3
Misa Hirose, Paul Schilf, Yask Gupta, Kim Zarse, Axel Künstner, Anke Fähnrich, Hauke Busch, Junping Yin, Marvin N Wright, Andreas Ziegler, Marie Vallier, Meriem Belheouane, John F Baines, Diethard Tautz, Kornelia Johann, Rebecca Oelkrug, Jens Mittag, Hendrik Lehnert, Alaa Othman, Olaf Jöhren, Markus Schwaninger, Cornelia Prehn, Jerzy Adamski, Kensuke Shima, Jan Rupp, Robert Häsler, Georg Fuellen, Rüdiger Köhling, Michael Ristow, Saleh M Ibrahim
Mutations in mitochondrial DNA (mtDNA) lead to heteroplasmy, i.e., the intracellular coexistence of wild-type and mutant mtDNA strands, which impact a wide spectrum of diseases but also physiological processes, including endurance exercise performance in athletes. However, the phenotypic consequences of limited levels of naturally arising heteroplasmy have not been experimentally studied to date. We hence generated a conplastic mouse strain carrying the mitochondrial genome of an AKR/J mouse strain (B6-mtAKR ) in a C57BL/6 J nuclear genomic background, leading to >20% heteroplasmy in the origin of light-strand DNA replication (OriL)...
April 12, 2018: Scientific Reports
https://www.readbyqxmd.com/read/29643999/sympatho-adrenergic-activation-by-endurance-exercise-effect-on-metanephrines-spillover-and-its-role-in-predicting-athlete-s-performance
#4
Elisa Danese, Cantor Tarperi, Gian Luca Salvagno, Alessandra Guzzo, Fabian Sanchis-Gomar, Luca Festa, Luciano Bertinato, Martina Montagnana, Federico Schena, Giuseppe Lippi
Background: The sympatho-adrenergic activation during exercise is implicated in many cardiovascular respiratory and metabolic adaptations which have been thought to partially explain the different levels of performance observed between trained and untrained subjects. To date, no evidence exists about the association between competition performance and markers of "acute stress response". We designed this study to investigate; (i) the acute sympatho-adrenergic activation during endurance exercise in recreational runners by measuring plasma levels of free metanephrine (MN) and normethanephrine (NMN) before and after a half-marathon run; (ii) the association between the metanephrines levels and the running time...
March 20, 2018: Oncotarget
https://www.readbyqxmd.com/read/29643814/impact-of-short-term-training-camp-on-aortic-blood-pressure-in-collegiate-endurance-runners
#5
Tsubasa Tomoto, Jun Sugawara, Ai Hirasawa, Tomoko Imai, Seiji Maeda, Shigehiko Ogoh
To investigate the influence of short-term vigorous endurance training on aortic blood pressure (BP), pulse wave analysis was performed in 36 highly trained elite collegiate endurance runners before and after a 7-day intense training camp. Subjects participated three training sessions per day, which mainly consisted of long distance running and sprint training to reach the daily target distance of 26 km. After the camp, they were divided into two groups based on whether the target training was achieved. Aortic systolic BP, pulse pressure, and tension-time index (TTI, a surrogate index of the myocardial oxygen demand) were significantly elevated after the camp in the accomplished group but not in the unaccomplished group, whereas the brachial BP remained unchanged in both groups...
2018: Frontiers in Physiology
https://www.readbyqxmd.com/read/29624450/national-athletic-trainers-association-position-statement-evaluation-management-and-outcomes-of-and-return-to-play-criteria-for-overhead-athletes-with-superior-labral-anterior-posterior-injuries
#6
Lori A Michener, Jeffrey S Abrams, Kellie C Huxel Bliven, Sue Falsone, Kevin G Laudner, Edward G McFarland, James E Tibone, Charles A Thigpen, Timothy L Uhl
OBJECTIVE:   To present recommendations for the diagnosis, management, outcomes, and return to play of athletes with superior labral anterior-posterior (SLAP) injuries. BACKGROUND:   In overhead athletes, SLAP tears are common as either acute or chronic injuries. The clinical guidelines presented here were developed based on a systematic review of the current evidence and the consensus of the writing panel. Clinicians can use these guidelines to inform decision making regarding the diagnosis, acute and long-term conservative and surgical treatment, and expected outcomes of and return-to-play guidelines for athletes with SLAP injuries...
March 2018: Journal of Athletic Training
https://www.readbyqxmd.com/read/29618981/influence-of-endurance-training-during-childhood-on-total-hemoglobin-mass
#7
Nicole Prommer, Nadine Wachsmuth, Ina Thieme, Christian Wachsmuth, Erica M Mancera-Soto, Andreas Hohmann, Walter F J Schmidt
Elite endurance athletes are characterized by markedly increased hemoglobin mass (Hbmass). It has been hypothesized that this adaptation may occur as a response to training at a very young age. Therefore, the aim of this study was to monitor changes in Hbmass in children aged 8-14 years following systematic endurance training. In the first study, Hbmass, VO2max, and lean body mass (LBM) were measured in 17 endurance-trained children (13 boys and 4 girls; aged 9.7 ± 1.3 years; training history 1.5±1.8 years; training volume 3...
2018: Frontiers in Physiology
https://www.readbyqxmd.com/read/29603120/analysis-of-sports-relevant-polymorphisms-in-a-large-brazilian-cohort-of-top-level-athletes
#8
João Paulo Limongi França Guilherme, Rômulo Bertuzzi, Adriano Eduardo Lima-Silva, Alexandre da Costa Pereira, Antonio Herbert Lancha Junior
In recent years, there have been an increasing number of genetic variants associated with athletic phenotypes. Here, we selected a set of sports-relevant polymorphisms that have been previously suggested as genetic markers for human physical performance, and we examined their association with athletic status in a large cohort of Brazilians. We evaluated a sample of 1,622 individuals, in which 966 were nonathletes, and 656 were athletes: 328 endurance athletes and 328 power athletes. Only the AGT M268T minor allele was nominally associated with the endurance status...
March 30, 2018: Annals of Human Genetics
https://www.readbyqxmd.com/read/29600149/facile-chemical-routes-to-mesoporous-silver-substrates-for-sers-analysis
#9
Elina A Tastekova, Alexander Yu Polyakov, Anastasia E Goldt, Alexander V Sidorov, Alexandra A Oshmyanskaya, Irina V Sukhorukova, Dmitry V Shtansky, Wolgang Grünert, Anastasia V Grigorieva
Mesoporous silver nanoparticles were easily synthesized through the bulk reduction of crystalline silver(I) oxide and used for the preparation of highly porous surface-enhanced Raman scattering (SERS)-active substrates. An analogous procedure was successfully performed for the production of mesoporous silver films by chemical reduction of oxidized silver films. The sponge-like silver blocks with high surface area and the in-situ-prepared mesoporous silver films are efficient as both analyte adsorbents and Raman signal enhancement mediators...
2018: Beilstein Journal of Nanotechnology
https://www.readbyqxmd.com/read/29599872/responsiveness-of-the-countermovement-jump-and-handgrip-strength-to-an-incremental-running-test-in-endurance-athletes-influence-of-sex
#10
Felipe García-Pinillos, Pedro Delgado-Floody, Cristian Martínez-Salazar, Pedro Á Latorre-Román
The present study analyzed the acute effects of an incremental running test on countermovement jump (CMJ) and handgrip strength performance in endurance athletes, considering the effect of post-exercise recovery time and sex. Thirty-three recreationally trained long-distance runners, 20 men and 13 women, participated voluntarily in this study. The participants performed the Léger test, moreover, the CMJ and handgrip strength tests were carried out before and after the running test and during different stages of recovery (at the 1st min of recovery (posttest1), 5th min of recovery (posttest2), and 10th min of recovery (posttest3))...
March 2018: Journal of Human Kinetics
https://www.readbyqxmd.com/read/29599725/validity-and-reliability-of-10-hz-global-positioning-system-to-assess-in-line-movement-and-change-of-direction
#11
Pantelis T Nikolaidis, Filipe M Clemente, Cornelis M I van der Linden, Thomas Rosemann, Beat Knechtle
The objectives of the present study were to examine the validity and reliability of the 10 Hz Johan GPS unit in assessing in-line movement and change of direction. The validity was tested against the criterion measure of 200 m track-and-field (track-and-field athletes, n = 8) and 20 m shuttle run endurance test (female soccer players, n = 20). Intra-unit and inter-unit reliability was tested by intra-class correlation coefficient (ICC) and coefficient of variation (CV), respectively. An analysis of variance examined differences between the GPS measurement and five laps of 200 m at 15 km/h, and t -test examined differences between the GPS measurement and 20 m shuttle run endurance test...
2018: Frontiers in Physiology
https://www.readbyqxmd.com/read/29590340/exercise-cardiac-magnetic-resonance-to-differentiate-athlete-s-heart-from-structural-heart-disease
#12
Guido Claessen, Frédéric Schnell, Jan Bogaert, Mathias Claeys, Nele Pattyn, Frederik De Buck, Steven Dymarkowski, Piet Claus, Francois Carré, Johan Van Cleemput, Andre La Gerche, Hein Heidbuchel
Aims: The distinction between left ventricular (LV) dilation with mildly reduced LV ejection fraction (EF) in response to regular endurance exercise training and an early cardiomyopathy is a frequently encountered and difficult clinical conundrum. We hypothesized that exercise rather than resting measures would provide better discrimination between physiological and pathological LV remodelling and that preserved exercise capacity does not exclude significant LV damage. Methods and results: We prospectively included 19 subjects with LVEF between 40 and 52%, comprising 10 ostensibly healthy endurance athletes (EA-healthy) and nine patients with dilated cardiomyopathy (DCM)...
March 26, 2018: European Heart Journal Cardiovascular Imaging
https://www.readbyqxmd.com/read/29589406/improved-cardiorespiratory-fitness-following-moderate-exercise-may-encourage-inactive-people-for-doable-and-sustainable-behavioral-change
#13
Gábor Pavlik, Eva Bakács, Eszter Csajági, Tibor Bakács, Judit Noe, Robert Kirschner
BACKGROUND: Global physical inactivity pandemic is responsible for more than 5 million deaths annually through its effects on non-communicable diseases. This requires urgent intervention. OBJECTIVE: To investigate associations of physical activity with cardiovascular fitness in a cross-sectional retrospective observational study. Data were collected for 21 years from 2530 healthy volunteers and athletes representing the entire spectrum of physical activity from the totally inactive sedentary persons to the highly trained national athletes...
March 27, 2018: Journal of Sports Medicine and Physical Fitness
https://www.readbyqxmd.com/read/29584528/the-cortisol-awakening-response-is-associated-with-training-load-in-endurance-runners
#14
Travis Anderson, Amy R Lane, Anthony C Hackney
The cortisol awakening response (CAR) is commonly used as a marker of psychological stress, however it is unknown whether CAR is affected by regular physical exercise induced stress. PURPOSE: Therefore, the purpose of this study was to assess the relationship between training load and CAR. METHODS: Recreational endurance athletes were recruited from local club running groups. Subjects (n = 15) completed training logs for two weeks, with various training loads, including psychometric analysis (RESTQ-Sport)...
March 27, 2018: International Journal of Sports Physiology and Performance
https://www.readbyqxmd.com/read/29581653/effects-of-mechanical-bed-massage-on-exercise-induced-back-fatigue-in-athletes
#15
Houyong Zhong, Wichai Eungpinichpong, Xingze Wang, Uraiwon Chatchawan, Sawitri Wanpen, Orawan Buranruk
[Purpose] The study aimed to preliminarily investigate the effects of mechanical-bed massage on exercise-induced back fatigue in athletes. [Subjects and Methods] Twelve male college athletes, randomly allocated to experimental or control groups, were instructed to perform reverse sit-up for 8 sessions until they became fatigued. The experimental group received a 20-min mechanical-bed massage session, while the control group rested on a bed for the same period of time. Visual Analogue Scale (VAS) on perceived back muscle fatigue, back muscle endurance, and Heart Rate Variability (HRV) parameters including stress index (SI), HRV index, SDNN, RMSSD, pNN50, LF, HF, and LF/HF were analyzed...
March 2018: Journal of Physical Therapy Science
https://www.readbyqxmd.com/read/29570600/the-age-of-peak-marathon-performance-in-cross-country-skiing-the-engadin-ski-marathon
#16
Beat Knechtle, Pantelis T Nikolaidis
Knechtle, B and Nikolaidis, PT. The age of peak marathon performance in cross-country skiing-the "Engadin Ski Marathon." J Strength Cond Res 32(4): 1131-1136, 2018-The age of the best endurance performance has been well investigated in flat city running marathons. However, we have no knowledge about the age of peak marathon performance in cross-country skiing, which would be of great practical value for athletes and coaches. Therefore, the aim of the present study was to examine the age of peak marathon performance in cross-country skiing...
April 2018: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/29568244/herbal-medicine-for-sports-a-review
#17
REVIEW
Maha Sellami, Olfa Slimeni, Andrzej Pokrywka, Goran Kuvačić, Lawrence D Hayes, Mirjana Milic, Johnny Padulo
The use of herbal medicinal products and supplements has increased during last decades. At present, some herbs are used to enhance muscle strength and body mass. Emergent evidence suggests that the health benefits from plants are attributed to their bioactive compounds such as Polyphenols, Terpenoids, and Alkaloids which have several physiological effects on the human body. At times, manufacturers launch numerous products with banned ingredient inside with inappropriate amounts or fake supplement inducing harmful side effect...
2018: Journal of the International Society of Sports Nutrition
https://www.readbyqxmd.com/read/29565161/-adherence-to-the-mediterranean-diet-in-inactive-adults-indoor-cycling-practitioners-and-amateur-cyclists
#18
Carmen Mayolas-Pi, Diego Munguia-Izquierdo, Carlos Peñarrubia-Lozano, Joaquín Reverter-Masia, Javier Bueno-Antequera, Isaac López-Laval, Miguel Ángel Oviedo-Caro, Víctor Murillo-Lorente, Alfonso Murillo-Fuentes, Federico Paris-García, Alejandro Legaz-Arrese
INTRODUCTION: There is limited information referred to the relationship between adherence to the Mediterranean Diet (AMD) and sports practice. OBJECTIVE: To determinate the association of cycling practice and cycling training volume with the AMD and the influence of the participation in a high-demand cyclist event on the AMD. MATERIAL AND METHODS: A first evaluation of AMD in 785 (84 women) amateur cyclists (volume: ≥ 7 hours/week), 514 (224 women) indoor cycling practitioners (volume: 2-6 hours/week) and 718 (411 women) inactive adults was conducted in May coinciding with the participation of cyclists in a cycling event...
November 24, 2017: Nutrición Hospitalaria: Organo Oficial de la Sociedad Española de Nutrición Parenteral y Enteral
https://www.readbyqxmd.com/read/29562613/effects-of-low-versus-moderate-glycemic-index-diets-on-aerobic-capacity-in-endurance-runners-three-week-randomized-controlled-crossover-trial
#19
Krzysztof Durkalec-Michalski, Emilia E Zawieja, Bogna E Zawieja, Dominika Jurkowska, Maciej S Buchowski, Jan Jeszka
The glycemic index (GI) of ingested carbohydrates may influence substrate oxidation during exercise and athletic performance. Therefore, the aim of this study was to assess the effect of low- and moderate-GI three-week diets on aerobic capacity and endurance performance in runners. We conducted a randomized crossover feeding study of matched diets differing only in GI (low vs. moderate) in 21 endurance-trained runners. Each participant consumed both, low- (LGI) and moderate-GI (MGI) high-carbohydrate (~60%) and nutrient-balanced diets for three weeks each...
March 17, 2018: Nutrients
https://www.readbyqxmd.com/read/29561708/the-agtr2-rs11091046-a-c-polymorphism-and-power-athletic-status-in-top-level-brazilian-athletes
#20
João Paulo Limongi França Guilherme, Mariana Sussi Silva, Rômulo Bertuzzi, Antonio Herbert Lancha Junior
The main purpose of this study was to investigate if the rs11091046 (A>C) polymorphism in AGTR2 gene is associated with athletic status in top-level athletes from Brazil. Since the AGTR2 gene is located on the X chromosome, the case-control association study was done separately for women and men. The female cohort was composed of 205 athletes and 241 non-athletes, and the male cohort was composed of 419 athletes and 490 non-athletes. We did not identify an association between the C-allele and the endurance phenotype...
March 21, 2018: Journal of Sports Sciences
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