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https://www.readbyqxmd.com/read/28194734/physical-and-physiological-profiles-of-brazilian-jiu-jitsu-athletes-a-systematic-review
#1
REVIEW
Leonardo Vidal Andreato, Francisco Javier Díaz Lara, Alexandro Andrade, Braulio Henrique Magnani Branco
BACKGROUND: Brazilian jiu-jitsu is a grappling combat sport that has intermittency as its core element; in other words, actions of high, moderate and low intensity are interspersed during matches, requiring a high level of conditioning to support optimal levels of performance for the total match time. The athletes perform from four to six matches during a day of competition, and this number may increase if the open-class competition, which is held parallel to the competition by weight class, is considered...
December 2017: Sports Medicine—Open
https://www.readbyqxmd.com/read/28192034/physiological-and-perceived-responses-in-different-levels-of-exergames-in-elite-athletes
#2
Louisa Ming Yan Chung, Feng Hua Sun, Chris Tsz Man Cheng
OBJECTIVE: Exergames have been suggested to increase the public's physical activity and to benefit cardiovascular health, particularly among the youth. However, not many studies compared the physiological and perceived responses between exergames and the authentic sports especially for elite athletes. This study aimed to investigate the physiological and perceived responses in different levels of Nintendo(®) Wii Fit™ U rowing exergames in one group of elite rowing athletes. MATERIALS AND METHODS: All participants were asked to perform the authentic rowing on the indoor rowing machine on the first day and to play the rowing exergames on the second day, in three levels with 1 hour rest between levels...
February 2017: Games for Health
https://www.readbyqxmd.com/read/28188329/deviations-from-mirroring-in-interpersonal-multifrequency-coordination-when-visual-information-is-occluded
#3
Jamie C Gorman, Polemnia G Amazeen, Michael J Crites, Christina L Gipson
In activities such as dancing and sports, people synchronize behaviors in many different ways. Synchronization between people has traditionally been characterized as either perfect mirroring (1:1 in-phase synchronization, spontaneous synchrony, and mimicry) or reflectional mirroring (1:1 antiphase synchronization), but most activities require partners to synchronize more complicated patterns. We asked visually coupled dyads to coordinate finger movements to perform multifrequency ratios (1:1, 2:1, 3:1, 4:1, and 5:1)...
February 10, 2017: Experimental Brain Research. Experimentelle Hirnforschung. Expérimentation Cérébrale
https://www.readbyqxmd.com/read/28188199/back-to-the-future-revisiting-the-physiological-cost-of-negative-work-as-a-team-based-activity-for-exercise-physiology-students
#4
Matthew A Kilgas, Steven J Elmer
We implemented a team-based activity in our exercise physiology teaching laboratory that was inspired from Abbott et al.'s classic 1952 Journal of Physiology paper titled "The physiological cost of negative work." Abbott et al. connected two bicycles via one chain. One person cycled forward (muscle shortening contractions, positive work) while the other resisted the reverse moving pedals (muscle lengthening contractions, negative work), and the cost of work was compared. This study was the first to link human whole body energetics with isolated muscle force-velocity characteristics...
March 1, 2017: Advances in Physiology Education
https://www.readbyqxmd.com/read/28185807/specific-circulating-phospholipids-acylcarnitines-amino-acids-and-biogenic-amines-are-aerobic-exercise-markers
#5
Thomas K Felder, Susanne Ring-Dimitriou, Simon Auer, Selma M Soyal, Ludmilla Kedenko, Mark Rinnerthaler, Janne Cadamuro, Elisabeth Haschke-Becher, Elmar Aigner, Bernhard Paulweber, Wolfgang Patsch
OBJECTIVES: Regular aerobic exercise provides beneficial effects on human health and reduces all-cause mortality. Aerobic exercise has profound metabolic effects, and specific metabolites may reflect physiological changes. We aimed to identify endogenous metabolites that distinguish the trained from the untrained state to increase the spectrum of analytes amenable for hypothesis testing and to expand understanding of putative beneficial pathways. DESIGN: Cross sectional laboratory repeated measures study...
January 24, 2017: Journal of Science and Medicine in Sport
https://www.readbyqxmd.com/read/28185706/training-induced-right-ventricular-remodelling-in-pre-adolescent-endurance-athletes-the-athlete-s-heart-in-children
#6
Flavio D'Ascenzi, Antonio Pelliccia, Francesca Valentini, Angela Malandrino, Benedetta Maria Natali, Riccardo Barbati, Marta Focardi, Marco Bonifazi, Sergio Mondillo
AIMS: Little is known about the adaptation of the right ventricle (RV) to endurance exercise in children. The aim of this study was to assess the effects of 5months of intensive training on RV morphology and function in preadolescent endurance athletes. METHODS: Ninety-four children were evaluated in this study. Fifty-seven male competitive swimmers (aged 10.8±0.2years) were evaluated before (baseline) and after 5months of the training (peak-training), and compared to 37 age- and sex-matched non-athlete children evaluated at baseline and after 5months of natural growth...
January 27, 2017: International Journal of Cardiology
https://www.readbyqxmd.com/read/28177718/the-physiological-response-to-cold-water-immersion-following-a-mixed-martial-arts-training-session
#7
Angus Lindsay, Sam Carr, Sean Cross, Carl Petersen, John G Lewis, Steven P Gieseg
Combative sport is one of the most physically intense forms of exercise, yet the effect of recovery interventions has been largely unexplored. We investigated the effect of cold water immersion on structural, inflammatory and physiological stress biomarkers following a mixed martial arts contest preparation training session in comparison to passive recovery. Semi-professional MMA competitors (n=15) were randomly assigned to a cold water immersion (15 min at 10°C) or passive recovery protocol (ambient air) completed immediately following a contest preparation training session...
January 17, 2017: Applied Physiology, Nutrition, and Metabolism, Physiologie Appliquée, Nutrition et Métabolisme
https://www.readbyqxmd.com/read/28159654/physiological-basis-behind-ergogenic-effects-of-anabolic-androgens
#8
Ada S Cheung, Mathis Grossmann
Anabolic androgenic steroids (AAS) are widely abused by the sporting community. Demonstrating performance enhancing effects of AAS in rigorous scientific studies is fraught with difficulty. In controlled studies, AAS have consistently been reported to increase muscle mass and strength. The clinical evidence that these anabolic effects are independent of, and additive to exercise are supported by preclinical studies suggesting that AAS and exercise affect muscle by overlapping, yet distinct mechanisms. AAS may also improve performance by their actions on other organ systems, such as the vasculature, and the erythropoietic and central nervous system, although this evidence is less strong...
January 31, 2017: Molecular and Cellular Endocrinology
https://www.readbyqxmd.com/read/28158252/physiological-responses-and-external-validity-of-a-new-setting-for-taekwondo-combat-simulation
#9
Matheus Hausen, Pedro Paulo Soares, Marcus Paulo Araújo, Flávia Porto, Emerson Franchini, Craig Alan Bridge, Jonas Gurgel
Combat simulations have served as an alternative framework to study the cardiorespiratory demands of the activity in combat sports, but this setting imposes rule-restrictions that may compromise the competitiveness of the bouts. The aim of this study was to assess the cardiorespiratory responses to a full-contact taekwondo combat simulation using a safe and externally valid competitive setting. Twelve male national level taekwondo athletes visited the laboratory on two separate occasions. On the first visit, anthropometric and running cardiopulmonary exercise assessments were performed...
2017: PloS One
https://www.readbyqxmd.com/read/28154888/permanent-knee-sensorimotor-system-changes-following-acl-injury-and-surgery
#10
John Nyland, Collin Gamble, Tiffany Franklin, David N M Caborn
The cruciate ligaments are components of the knee capsuloligamentous system providing vital neurosensory and biomechanical function. Since most historical primary ACL repair attempts were unsuccessful, reconstruction has become the preferred surgery. However, an increased understanding of the efficacy of lesion-site scaffolding, innovative suturing methods and materials, and evolving use of biological healing mediators such as platelet-rich plasma and stem cells has prompted reconsideration of what was once believed to be impossible...
February 2, 2017: Knee Surgery, Sports Traumatology, Arthroscopy: Official Journal of the ESSKA
https://www.readbyqxmd.com/read/28149429/physiological-nutritional-and-performance-profiles-of-brazilian-jiu-jitsu-athletes
#11
Leonardo V Andreato, Jonatas Fs Santos, João Vdc Esteves, Valeria Lg Panissa, Ursula F Julio, Emerson Franchini
This study analysed the physiological, nutritional and performance profiles of athletes practicing Brazilian jiu-jitsu. To this end, 15 athletes that practiced Brazilian jiu-jitsu (aged: 28 ± 5 years; 8 brown belts and 7 black belts; training experience: 11 ± 4 years) underwent anthropometric measurements (body composition and somatotype), dietary evaluation (24 h recall) and physical fitness tests (movement time, dynamometer handgrip, kimono grip strength, vertical jump and sit-and-reach tests). The athletes had 12...
December 1, 2016: Journal of Human Kinetics
https://www.readbyqxmd.com/read/28149413/left-atrial-enlargement-in-young-high-level-endurance-athletes-another-sign-of-athlete-s-heart
#12
Wojciech Król, Ilona Jędrzejewska, Marcin Konopka, Krystyna Burkhard-Jagodzińska, Andrzej Klusiewicz, Andrzej Pokrywka, Jolanta Chwalbińska, Dariusz Sitkowski, Mirosław Dłużniewski, Artur Mamcarz, Wojciech Braksator
Enlargement of the left atrium is perceived as a part of athlete's heart syndrome, despite the lack of evidence. So far, left atrial size has not been assessed in the context of exercise capacity. The hypothesis of the present study was that LA enlargement in athletes was physiological and fitness-related condition. In addition, we tried to assess the feasibility and normal values of left atrial strain parameters and their relationship with other signs of athlete's heart. The study group consisted of 114 international-level rowers (17...
December 1, 2016: Journal of Human Kinetics
https://www.readbyqxmd.com/read/28149348/influence-of-physiological-loading-on-the-lumbar-spine-of-national-level-athletes-in-different-sports
#13
Mansoorehossadat Rozan, Vahid Rouhollahi, Amit Rastogi, Dilip Kumar Dureha
The lumbar spine is subjected to considerable stress during many athletic efforts. The purpose of this study was to assess the effects of physiological loading on the lumbar spine in national male players of different games, which may be predictive of the future development of low back pain and injury symptoms. Thirty-four national players (12 cricket players, 12 field hockey players, and 10 basketball players) underwent magnetic resonance imaging, and selected geometric variables including intervertebral disc angles, the Farfan ratio, the lumbar body index, the compression deformity ratio, the biconcave deformity ratio and the anterior wedge deformity ratio were measured using KINOVEA-0...
April 1, 2016: Journal of Human Kinetics
https://www.readbyqxmd.com/read/28145733/why-do-team-sport-athletes-drink-fluid-in-excess-when-exercising-in-cool-conditions
#14
Melissa J Bargh, Roderick F G J King, Michael P Gray, Ben Jones
This study assessed the potential physiological and perceptual drivers of fluid intake and thirst sensation during intermittent exercise. Ten male rugby players (17 ± 1 years, stature: 179.1 ± 4.2 cm, body mass (BM): 81.9 ± 8.1 kg) participated in six 6-min small-sided games, interspersed with 2 min rest, where fluid intake was ad libitum during rest periods. Pre- and postmeasurements of BM, subjective ratings (thirst, thermal comfort, thermal sensation, mouth dryness), plasma osmolality (POsm), serum sodium concentration (S[Na(+)]), haematocrit and haemoglobin (to calculate plasma volume change; PV) were taken...
November 10, 2016: Applied Physiology, Nutrition, and Metabolism, Physiologie Appliquée, Nutrition et Métabolisme
https://www.readbyqxmd.com/read/28140625/ncaa-football-off-season-training-unanswered-prayers%C3%A2-a-prayer-answered
#15
Scott Anderson
Off-season training in year-round collegiate football is purported to be performance enhancing. Absent principles of exercise physiology, excesses in sport-training regimens pose risk to the participant athletes. Since 2000, 32 National Collegiate Athletic Association (NCAA) football players have died in sport: 26 nontraumatic deaths and 6 traumatic deaths, a ratio of more than 4 nontraumatic deaths for every traumatic death. On average, 2 NCAA football players die per season played. Best practices, consensus guidelines, and precautions are ignored, elevating the risk...
January 31, 2017: Journal of Athletic Training
https://www.readbyqxmd.com/read/28130115/strategies-that-athletes-use-to-avoid-detection-of-androgenic-anabolic-steroid-doping-and-sanctions
#16
Hussain Alquraini, Richard J Auchus
Androgenic-anabolic steroids (AAS) are potent and widely used performance-enhancing substances (PES). Since the International Olympic Committee (IOC) began testing athletes for AAS in the 1970s, athletes and their teams have endeavored to beat the system to avoid doping violations and/or sanctions derived from positive test results. This review will discuss the strategies used to avoid detection based on the pharmacology, biochemistry, and genetics of AAS metabolism and testing principles. Another strategy used is to dope with testosterone under the guise that the athlete has a true medical condition that requires testosterone treatment, using the therapeutic use exemption (TUE) mechanism...
January 24, 2017: Molecular and Cellular Endocrinology
https://www.readbyqxmd.com/read/28123866/-64-cucl2-pet-ct-imaging-of-mouse-muscular-injury-induced-by-electroporation
#17
Fang Xie, Huawei Cai, Fangyu Peng
Skeletal muscle injury is common in body injuries suffered in sports and car accidents. Development of new tracers is significant for assessing muscular injury with positron emission tomography/computed tomography (PET/CT) and monitoring repair of muscle injury in response to treatment. Copper is required for wound healing and increased copper ions were detected in the soft tissue of wound in rodents and human. Based on the recent finding of increased (64)Cu uptake in the traumatic brain injury, this study aimed to explore use of (64)CuCl2 as a radiotracer for molecular imaging of muscular injury using PET/CT...
2017: American Journal of Nuclear Medicine and Molecular Imaging
https://www.readbyqxmd.com/read/28095083/physiological-capacity-and-training-routines-of-elite-cross-country-skiers-approaching-the-upper-limits-of-human-endurance
#18
Øyvind Sandbakk, Hans-Christer Holmberg
Cross-country skiing is one of the most demanding of endurance sports, involving protracted competitions on varying terrain employing a variety of skiing techniques that require upper- and/or lower-body work to different extents. Through more effective training and extensive improvements in equipment and track preparation, the speed of cross-country ski races has increased more than that of any other winter Olympic sport and, in addition, new types of racing events have been introduced. To a certain extent this has altered the optimal physiological capacity required to win and the training routines of successful skiers have evolved accordingly...
January 17, 2017: International Journal of Sports Physiology and Performance
https://www.readbyqxmd.com/read/28095069/the-evolution-of-champion-cross-country-skier-training-from-lumberjacks-to-professional-athletes
#19
Øyvind Sandbakk
Competitive cross-country (XC) skiing has traditions extending back to the mid-19th century, and was included as a men's event in the first Winter Games in 1924. Since then, tremendous improvements in equipment, track preparation, and knowledge about training have prompted greater increases in XC skiing speeds than in any other Olympic sport. In response, this commentary focuses on how the training of successful XC skiers has evolved, with interviews and training data from surviving Norwegian world and Olympic XC champions as primary sources...
January 17, 2017: International Journal of Sports Physiology and Performance
https://www.readbyqxmd.com/read/28081033/performance-aspects-and-physiological-responses-in-male-amateur-boxing-competitions-a-brief-review
#20
Maamer Slimani, Helmi Chaabène, Philip Davis, Emerson Franchini, Karim Chamari
Boxing is one of the most popular striking combat sports in the world. The aim of this review was to present data concerning performance analysis (time-motion and technical/tactical analysis) and physiological responses (i.e., blood lactate concentration [BLC], heart rate and/or oxygen consumption) during novice and elite male simulated and official amateur boxing competitions in any age category. The present review shows that boxing competition is a high-intensity intermittent striking combat sport. Typically, the activity-to-rest ratio was higher in elite (18:1) than novice (9:1) boxers and significant differences were observed between rounds (1 round=16:1, 2 round=8:1, and 3 round=6:1) in novice boxers...
January 4, 2017: Journal of Strength and Conditioning Research
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