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https://www.readbyqxmd.com/read/29666584/differences-in-muscle-metabolism-between-triathletes-and-normally-active-volunteers-investigated-using-multinuclear-magnetic-resonance-spectroscopy-at-7t
#1
Radka Klepochová, Ladislav Valkovič, Thomas Hochwartner, Christoph Triska, Norbert Bachl, Harald Tschan, Siegfried Trattnig, Michael Krebs, Martin Krššák
Purpose: The influence of endurance training on skeletal muscle metabolism can currently be studied only by invasive sampling or through a few related parameters that are investigated by either proton (1 H) or phosphorus (31 P) magnetic resonance spectroscopy (MRS). The aim of this study was to compare the metabolic differences between endurance-trained triathletes and healthy volunteers using multi-parametric data acquired by both, 31 P- and 1 H-MRS, at ultra-high field (7T) in a single experimental protocol...
2018: Frontiers in Physiology
https://www.readbyqxmd.com/read/29648505/abstracts-from-the-5th-annual-congress-on-medicine-science-in-ultra-endurance-sports-may-9-10-2018-castell%C3%A3-de-la-plana-spain
#2
(no author information available yet)
No abstract text is available yet for this article.
April 12, 2018: International Journal of Sports Physiology and Performance
https://www.readbyqxmd.com/read/29359592/performance-and-physiological-analysis-of-500-km-non-stop-cycling-a-case-study
#3
Pedro L Valenzuela, Carl Foster, Alejandro Lucía, Pedro de la Villa
Ultra-endurance sports have gained popularity over the last years. In this case, a well-trained cyclist completed 503.5 km non-stop (33.3 km.h-1 ). Speed and power output were reduced during the trial, being the reduction of power attributable to changes in pedal velocity rather than pedal forces. Heart rate (HR) showed an initial cardiovascular drift and progressively decreased independently of power. A decreased HR variability, a marked inflammatory response, signs of muscle damage and alterations of the haematological profile were observed after the trial...
April 2018: Research in Sports Medicine
https://www.readbyqxmd.com/read/29356949/validity-of-the-polar-v800-monitor-for-measuring-heart-rate-variability-in-mountain-running-route-conditions
#4
Pere Caminal, Fuensanta Sola, Pedro Gomis, Eduard Guasch, Alexandre Perera, Núria Soriano, Lluis Mont
PURPOSE: This study was conducted to test, in mountain running route conditions, the accuracy of the Polar V800™ monitor as a suitable device for monitoring the heart rate variability (HRV) of runners. METHOD: Eighteen healthy subjects ran a route that included a range of running slopes such as those encountered in trail and ultra-trail races. The comparative study of a V800 and a Holter SEER 12 ECG Recorder™ included the analysis of RR time series and short-term HRV analysis...
March 2018: European Journal of Applied Physiology
https://www.readbyqxmd.com/read/29236922/effects-of-n-acetylcysteine-on-amphetamine-induced-sensitization-in-mice
#5
Ana P Herrmann, Roberta Andrejew, Radharani Benvenutti, Clarissa S Gama, Elaine Elisabetsky
OBJECTIVE: N-acetylcysteine (NAC) is beneficial in psychiatric conditions, including schizophrenia. Patients with schizophrenia exhibit mesolimbic dopamine hyperfunction consequent to an endogenous sensitization process. This sensitization can be modeled in rodents by repeated exposure to psychostimulants, provoking an enduring amplified response at subsequent exposure. The aim of this study was to investigate the effects of NAC on amphetamine sensitization in mice. METHODS: D-amphetamine was administered to C57BL/6 mice three times a week for 3 weeks; the dose was increased weekly from 1 to 3 mg/kg...
December 11, 2017: Revista Brasileira de Psiquiatria
https://www.readbyqxmd.com/read/29190850/mri-cartilage-assessment-of-the-subtalar-and-midtarsal-joints-during-a-transcontinental-ultramarathon-new-insights-into-human-locomotion
#6
Uwe Hans-Werner Schütz, Christian Billich, Daniel Schoss, Meinrad Beer, Jutta Ellermann
MR measurements can be accurately performed during 4486 km of running, opening a window into in vivo assessment of hindfoot articular cartilage under extreme ultra-endurance loading. This observational cross-sectional study included 22 randomized participants of TransEurope FootRace between Italy and the North Cape, which was accompanied by a trailer-mounted 1.5T MRI scanner over 9 weeks. Four follow up MR examinations of subtalar and midtarsal joints were performed. Statistics of cartilage T2*  and thickness were obtained...
January 2018: International Journal of Sports Medicine
https://www.readbyqxmd.com/read/29133160/the-changes-of-red-blood-cell-viscoelasticity-and-sports-anemia-in-male-24-hr-ultra-marathoners
#7
Che-Hung Liu, Yen-Fang Tseng, Jiun-I Lai, Yin-Quan Chen, Shih-Hao Wang, Wei-Fong Kao, Li-Hua Li, Yu-Hui Chiu, Chorng-Kuang How, Wen-Han Chang
BACKGROUND: In endurance sports, stress, dehydration and release of chemical factors have been associated with red blood cell (RBC) alterations of structure and function, which may contribute to sports anemia, a well-observed phenomenon during long-distance running. Until now, the investigation of the changes of viscoelastic properties of RBC membrane, a decisive factor of RBC deformability to avoid hemolysis, is lacking, especially in an Oriental population. METHODS: nineteen runners were prospectively recruited into our study...
November 10, 2017: Journal of the Chinese Medical Association: JCMA
https://www.readbyqxmd.com/read/29118957/morphological-peculiarities-of-neuromuscular-junctions-among-different-fiber-types-effect-of-exercise
#8
Teet Seene, Maria Umnova, Priit Kaasik
The aim of our research was to examine whether there are differences in the morphology of neuromuscular junctions of different types of muscle fibers in rodents, and after their adaptation to six weeks endurance exercise training. After 5-day acclimation, Wistar rats were subjected to run with the speed 35 m/min during 6 week, 5 days per week and the training volume reached 60 min per day. Muscle samples for ultrastructural studies were fixed, dehydrated and embedded in Epon-812. Ultra-thin sections were cut from longitudinally and transversely oriented blocs, using 4 blocks from each animal...
June 27, 2017: European Journal of Translational Myology
https://www.readbyqxmd.com/read/29117450/nutrition-strategies-before-and-during-ultra-endurance-event-a-significant-gap-between-science-and-practice
#9
Soyzana K Papadopoulou, Eleni E Xyla, Spyridon Methenitis, Konstantinos G Feidantsis, Yiannis Kotsis, Ioannis G Pagkalos, Maria N Hassapidou
The purpose of the present study was to investigate and assess the nutritional practices of open-water swimmers, during the preparation period and the competition, as well as their implications on performance and anthropometric parameters according to their age. Twenty-four (n=24) men open-water swimmers, twelve young (26.3±4.9yrs) and twelve older athletes (45.8±9.7yrs), participated in the present study. Nutritional behavior - intake-energy consumption, and anthropometric characteristics were evaluated prior to the Toroneos Gulf crossing (26Km)...
November 8, 2017: Scandinavian Journal of Medicine & Science in Sports
https://www.readbyqxmd.com/read/29070954/race-predictors-and-hemodynamic-alteration-after-an-ultra-trail-marathon-race
#10
Noppon Taksaudom, Natee Tongsiri, Amarit Potikul, Chawakorn Leampriboon, Apichat Tantraworasin, Anong Chaiyasri
OBJECTIVE: Unique rough-terrain ultra-trail running races have increased in popularity. Concerns regarding the suitability of the candidates make it difficult for organizers to manage safety regulations. The purpose of this study was to identify possible race predictors and assess hemodynamic change after long endurance races. METHODS: We studied 228 runners who competed in a 66 km-trail running race. A questionnaire and noninvasive hemodynamic flow assessment including blood pressure, heart rate, stroke volume, stroke volume variation, systemic vascular resistance, cardiac index, and oxygen saturation were used to determine physiologic alterations and to identify finish predictors...
2017: Open Access Journal of Sports Medicine
https://www.readbyqxmd.com/read/29058466/changes-in-cardiac-and-muscle-biomarkers-following-an-uphill-only-marathon
#11
Alessandro Da Ponte, Nicola Giovanelli, Guglielmo Antonutto, Daniele Nigris, Francesco Curcio, Pietro Cortese, Stefano Lazzer
The aim of the study was to evaluate changes in cardiac troponin I levels (cTnI) and the main biomarkers of skeletal muscle damage after an uphill-only marathon, along with its relationship with athletes' physiological parameters. Twenty-two runners participated in the "Supermaratona dell'Etna" (43 km, 0-2850 m AMSL). Before and immediately after the race, body mass and hydration status were measured together with blood sampling. At the end of the race, mean cTnI increased significantly in all athletes (mean +900%), and in 52% of them the cTnI values were over the normal range...
January 2018: Research in Sports Medicine
https://www.readbyqxmd.com/read/29050040/maximal-fat-oxidation-is-related-to-performance-in-an-ironman-triathlon
#12
Jacob Frandsen, Stine Dahl Vest, Steen Larsen, Flemming Dela, Jørn W Helge
The aim of the present study was to investigate the relationship between maximal fat oxidation rate (MFO) measured during a progressive exercise test on a cycle ergometer and ultra-endurance performance. 61 male ironman athletes (age: 35±1 yrs. [23-47 yrs.], with a BMI of 23.6±0.3 kg/m2 [20.0-30.1 kg/m2 ], a body fat percentage of 16.7±0.7% [8.4-30.7%] and a VO2 peak of 58.7±0.7 ml/min/kg [43.9-72.5 ml/min/kg] SEM [Range]) were tested in the laboratory between 25 and 4 days prior to the ultra-endurance event, 2016 Ironman Copenhagen...
November 2017: International Journal of Sports Medicine
https://www.readbyqxmd.com/read/28955243/the-effect-of-a-100-km-ultra-marathon-under-freezing-conditions-on-selected-immunological-and-hematological-parameters
#13
Alena Žákovská, Beat Knechtle, Daniela Chlíbková, Marie Miličková, Thomas Rosemann, Pantelis T Nikolaidis
Although moderate exercise is beneficial for the human body and its immune system, exhaustive ultra-endurance performance in cold conditions might be harmful. The aim of this study was to examine the effect of a 100-km ultra-marathon under cold conditions (temperatures from -1°C to +1°C) on selected immunological, biochemical and hematological parameters. Participants were 15 runners (12 men and three women, age 40.3 ± 9.7 years, body mass 67.3 ± 9.0 kg and body height 1.74 ± 0.10 m, mean ± standard deviation)...
2017: Frontiers in Physiology
https://www.readbyqxmd.com/read/28883046/skeletal-muscle-mitochondrial-protein-synthesis-and-respiration-in-response-to-the-energetic-stress-of-an-ultra-endurance-race
#14
Adam R Konopka, William M Castor, Christopher A Wolff, Robert V Musci, Justin J Reid, Jaime L Laurin, Zackary J Valenti, Karyn L Hamilton, Benjamin F Miller
The 2016 Colorado Trail Race (CTR) was an ultra-endurance mountain bike race in which competitors cycled for up to 24 h/day between altitudes of 1,675 and 4,025 m to complete 800 km and 21,000 m of elevation gain. In one athlete, we had the unique opportunity to characterize skeletal muscle protein synthesis and mitochondrial respiration in response to a normal activity control period (CON) and the CTR. We hypothesized that mitochondrial protein synthesis would be elevated and mitochondrial respiration would be maintained during the extreme stresses of the CTR...
December 1, 2017: Journal of Applied Physiology
https://www.readbyqxmd.com/read/28847143/description-of-three-female-24-h-ultra-endurance-race-winners-in-various-weather-conditions-and-disciplines
#15
Daniela Chlíbková, Thomas Rosemann, Beat Knechtle, Pantelis T. Nikolaidis, Alena Žákovská, Karl Sudi
A The incidence of exercise-associated hyponatremia (EAH) is higher in women than in men. We present three cases of a very mild post-race EAH in female winners of three 24-h ultra races in various weather conditions and disciplines with post-race plasma sodium [Na⁺] levels of 134 mM (Case 1), 133 mM (Case 2) and 134 mM (Case 3). Moreover, Case 1 and Case 2 showed elevated creatine kinase concentrations of >10,000 U/l with an absence of renal function abnormality. The common characteristics were female sex, veteran recreational category, long race experience in the particular sports discipline, excellent race performance, similar total weekly training hours and the presence of luteal phase of the menstrual cycle during the race...
August 31, 2017: Chinese Journal of Physiology
https://www.readbyqxmd.com/read/28799161/performance-factors-in-a-mountain-ultramarathon
#16
Pascal Balducci, Michel Clémençon, Robin Trama, Yoann Blache, Christophe Hautier
This study aimed to determine mountain ultra-marathon (MUM) performance factors in a large group of endurance mountain runners. Maximal aerobic speed (MAS) was assessed one week prior to the MUM. The level and graded (10%) energy cost of running, stiffness, knee extensors force (KEf ), and jump height on a counter movement jump (CMJ) were measured in 24 male ultra runners before (pre) and immediately after (post) the Interlacs Trail (75 km and 3 930/3 700 m d+/d-). Performance time was correlated with MAS (r=- 0...
October 2017: International Journal of Sports Medicine
https://www.readbyqxmd.com/read/28790928/enhanced-right-chamber-remodeling-in-endurance-ultra-trail-athletes-compared-to-marathon-runners-detected-by-standard-and-speckle-tracking-echocardiography
#17
Kristian Ujka, Luca Bastiani, Gennaro D'Angelo, Bruna Catuzzo, Alessandro Tonacci, Simona Mrakic-Sposta, Alessandra Vezzoli, Guido Giardini, Lorenza Pratali
Background: Strenuous and endurance exercise training have been associated with morphological and functional heart remodeling. Two-dimensional speckle-tracking echocardiography (STE) is a novel technique that allows an accurate quantification of global myocardium deformation. Our aim was to evaluate together left and right cardiac remodeling in different long-distance running athletes: marathon runners (42 km) (M) and endurance mountain runners (>300 Km) (UT). Methods: A total of 92 athletes (70 males, 76%) including 47 M [age 45 ± 7 years; training: 18 (9-53) years(*)days/week], 45 UT [age 42 ± 9, training: 30 (15-66) years(*)days/week] underwent conventional echocardiography and STE (Beyond Diogenes 2...
2017: Frontiers in Physiology
https://www.readbyqxmd.com/read/28682407/selective-protein-transport-through-ultra-thin-suspended-reduced-graphene-oxide-nanopores
#18
Dae-Sik Lee, Seokhan Park, Yong Duk Han, Jae Eun Lee, Hu Young Jeong, Hyun C Yoon, Moon Yeon Jung, Sang Ouk Kim, Sung-Yool Choi
The nanoporous free-standing graphene membrane is of great interest in high performance separation technology. In particular, the separation of biological molecules with similar sizes is one of the key challenges in the purification of biomaterials. Here, we report a reliable, cost-effective, and facile method for the fabrication of a graphene-based nanosieve and its application in the separation of similar-size proteins. A suspended reduced graphene oxide (rGO) nanosieve with ultra-thin, large-area, well-ordered, and dense 15 nm-sized pores was fabricated using block copolymer (BCP) lithography...
September 21, 2017: Nanoscale
https://www.readbyqxmd.com/read/28566803/greater-muscle-damage-in-athletes-with-actn3-r577x-rs1815739-gene-polymorphism-after-an-ultra-endurance-race-a-pilot-study
#19
T Belli, A H Crisp, R Verlengia
In this study, we aimed to investigate the influence of ACTN3 R577X gene polymorphism on muscle damage responses in athletes competing in an ultra-endurance race. Twenty moderate to well-trained ultra-runners who had entered in an official 37.1 km adventure race (22.1 km mountain biking, 10.9 km trekking, 4.1 km water trekking, 30 m rope course, and orienteering) volunteered for the study. Blood samples were collected for genotyping and analysis of muscle protein levels before and after the race. Percentage changes (pre- to post-race) of serum myoglobin [XX = 5,377% vs...
June 2017: Biology of Sport
https://www.readbyqxmd.com/read/28535849/calf-endurance-and-achilles-tendon-structure-in-classical-ballet-dancers
#20
Jennifer A Zellers, Katrina van Ostrand, Karin Grävare Silbernagel
Optimal lower leg function is critical for ballet dancers to meet their occupational requirements. Achilles tendon injury is particularly detrimental to ballet dancers. While standardized measures have been validated and incorporated into clinical practice for use in people with Achilles tendon injury, normative ranges specific to the dancer population have not been described. The purpose of this pilot study was to observe the performance of pre-professional ballet students and professional ballet dancers on a well-established test battery for lower leg functional performance as well as ultra-sonographic evaluation of the structure of their Achilles tendons...
June 15, 2017: Journal of Dance Medicine & Science
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