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https://www.readbyqxmd.com/read/29158621/loaded-and-unloaded-jump-performance-of-top-level-volleyball-players-from-different-age-categories
#1
Katia Kitamura, Lucas Adriano Pereira, Ronaldo Kobal, Cesar Cavinato Cal Abad, Ronaldo Finotti, Fábio Yuzo Nakamura, Irineu Loturco
The aim of this study was to investigate the differences in loaded and unloaded jump performances between different age categories of top-level volleyball players from the same club. Forty-three volleyball players were divided into four age groups: under-17, under-19, under-21 and professional. Vertical jumping height for squat jump (SJ), countermovement jump (CMJ) and CMJ with arm swing (CMJa) and mean propulsive velocity (MPV) in the loaded jump squat exercise with 40% of the athlete's body mass were compared among the different age categories, considering body mass as a covariate...
September 2017: Biology of Sport
https://www.readbyqxmd.com/read/29144026/heart-rate-variability-and-implication-for-sport-concussion
#2
REVIEW
Scott A Bishop, Ryan T Dech, Przemyslaw Guzik, J Patrick Neary
Finding sensitive and specific markers for sports-related concussion is both challenging and clinically important. Such biomarkers might be helpful in the management of patients with concussion (i.e. diagnosis, monitoring and risk prediction). Among many parameters, blood flow-pressure metrics and heart rate variability (HRV) have been used to gauge concussion outcomes. Reports on the relation between HRV and both acute and prolonged concussion recovery are conflicting. While some authors report on differences in the low-frequency (LF) component of HRV during postural manipulations and postexercise conditions, others observe no significant differences in various HRV measures...
November 16, 2017: Clinical Physiology and Functional Imaging
https://www.readbyqxmd.com/read/29138214/sport-science-internships-for-learning-a-critical-view
#3
EDITORIAL
James J Malone
Sport science has gained vast popularity with students who have an interest in both physiology and the underpinning mechanisms of exercise concerning performance and health. The high numbers of graduates each year, coupled with the low number of graduate positions working in sports, has led to a high level of competition between students. To stand out from the crowd, sport science students may undertake an internship placement as part of their course, designed to enhance theoretical, practical, and soft skills in an applied setting...
December 1, 2017: Advances in Physiology Education
https://www.readbyqxmd.com/read/29124507/pre-performance-physiological-state-heart-rate-variability-as-a-predictor-of-shooting-performance
#4
E Ortega, C J K Wang
Heart rate variability (HRV) is commonly used in sport science for monitoring the physiology of athletes but not as an indicator of physiological state from a psychological perspective. Since HRV is established to be an indicator of emotional responding, it could be an objective means of quantifying an athlete's subjective physiological state before competition. A total of 61 sport shooters participated in this study, of which 21 were novice shooters, 19 were intermediate shooters, and 21 were advanced level shooters...
November 10, 2017: Applied Psychophysiology and Biofeedback
https://www.readbyqxmd.com/read/29123486/are-we-reaching-the-limits-of-homo-sapiens
#5
REVIEW
Adrien Marck, Juliana Antero, Geoffroy Berthelot, Guillaume Saulière, Jean-Marc Jancovici, Valérie Masson-Delmotte, Gilles Boeuf, Michael Spedding, Éric Le Bourg, Jean-François Toussaint
Echoing scientific and industrial progress, the Twentieth century was an unprecedented period of improvement for human capabilities and performances, with a significant increase in lifespan, adult height, and maximal physiological performance. Analyses of historical data show a major slow down occurring in the most recent years. This triggered large and passionate debates in the academic scene within multiple disciplines; as such an observation could be interpreted as our upper biological limits. Such a new phase of human history may be related to structural and functional limits determined by long term evolutionary constraints, and the interaction between complex systems and their environment...
2017: Frontiers in Physiology
https://www.readbyqxmd.com/read/29113535/effects-of-erythropoietin-abuse-on-exercise-performance
#6
Paolo Sgrò, Massimiliano Sansone, Andrea Sansone, Francesco Romanelli, Luigi Di Luigi
The present review provides a comprehensive overview on the erythropoietic and non-erythropoietic effects of rHuEpo on human sport performance, paying attention to quantifying numerically how rHuEpo affects exercise performance and describing physiological changes regarding the most important exercise variables. Much attention has been paid to treatment schedules, in particular, to assess the effects of microdoses of rHuEpo and the prolonged effects on sport performance following withdrawal. Moreover, the review takes into account non-erythropoietic ergogenic effects of rHuEpo, including cognitive benefits of rHuEpo...
November 8, 2017: Physician and Sportsmedicine
https://www.readbyqxmd.com/read/29091514/the-post-injury-psychological-sequelae-of-high-level-jamaican-athletes-exploration-of-a-post-traumatic-stress-disorder-self-efficacy-conceptualisation
#7
André Bateman, Kai A D Morgan
CONTEXT: Athletes at the highest levels appear to be most affected by sport-related injuries and suffer both physiologically and psychologically. Established models of psychological responses to injury however do not offer a comprehensive explanation based on Post-Traumatic Stress Disorder (PTSD), though some studies suggest that injuries may be interpreted as traumatic. Studies also suggest that perceived self-efficacy may be a mediator of PTSD development. OBJECTIVE: This study examines the psychological sequelae experienced by high-level athletes as a result of sport related injuries based on a PTSD-Self-Efficacy framework...
November 1, 2017: Journal of Sport Rehabilitation
https://www.readbyqxmd.com/read/29084095/a-multiple-repeated-sprint-ability-test-for-badminton-players-involving-four-changes-of-direction-validity-and-reliability-part-1
#8
Michael Phomsoupha, Quentin Berger, Guillaume Laffaye
The purpose of the present study was: i) to develop a new sport-specific, repeated sprint ability test involving four changes of direction, namely, the multiple repeated sprint ability (MRSAB) test for badminton players; ii) to determine its validity by comparing the results of five different skill levels; and iii) to assess the link between the new test and neuromuscular lower limb and physiological variables. For this purpose, 42 participants were separated into five groups in order to perform the MRSAB test at the same time of day, on two occasions, separated by at least 48 hours...
October 27, 2017: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/29083128/acute-neuromuscular-cognitive-and-physiological-responses-to-a-japanese-kickboxing-competition-in-semi-professional-fighters
#9
Giuseppe Cimadoro
BACKGROUND: Japanese kickboxing is a combat sport designed to accommodate fighters from different combat sports styles. However, the physiological profile of this discipline is unknown. Therefore, this study describes the neuromuscular, metabolic and cognitive responses to an official Japanese kickboxing (K-1) fight in 8 kickboxers. METHODS: Measurements before and after the competition involved a simple reaction time test (SRT), countermovement jump (CMJ), blood lactate (BLA) and rating of perceived exertion (RPE)...
October 27, 2017: Journal of Sports Medicine and Physical Fitness
https://www.readbyqxmd.com/read/29075203/physiological-tendon-thickness-adaptation-in-adolescent-elite-athletes-a-longitudinal-study
#10
Michael Cassel, Konstantina Intziegianni, Lucie Risch, Steffen Müller, Tilman Engel, Frank Mayer
Increased Achilles (AT) and Patellar tendon (PT) thickness in adolescent athletes compared to non-athletes could be shown. However, it is unclear, if changes are of pathological or physiological origin due to training. The aim of this study was to determine physiological AT and PT thickness adaptation in adolescent elite athletes compared to non-athletes, considering sex and sport. In a longitudinal study design with two measurement days (M1/M2) within an interval of 3.2 ± 0.8 years, 131 healthy adolescent elite athletes (m/f: 90/41) out of 13 different sports and 24 recreationally active controls (m/f: 6/18) were included...
2017: Frontiers in Physiology
https://www.readbyqxmd.com/read/29072028/differences-in-salivary-hormones-and-perception-of-exertion-in-elite-women-and-men-volleyball-players-during-tournament
#11
Luis E Peñailillo, Felipe A Escanilla, Esteban R Jury, Mauricio A Castro-Sepulveda, Louise Deldicque, Hermann P Zbinden-Foncea
Sports tournaments induce both psychological and physiological stress, which seems to be different between men and women. Competition induces anticipatory rises in testosterone and cortisol levels, which may affect performance and physical exertion during tournaments. PURPOSE: The aim of this study was to compare the changes in salivary cortisol and testosterone concentrations between men and women during an official volleyball tournament and to test potential correlations between changes in these hormones and perceived exertion after match...
October 24, 2017: Journal of Sports Medicine and Physical Fitness
https://www.readbyqxmd.com/read/29071833/-amenorrhea-in-athletic-adolescents-the-tip-of-the-iceberg
#12
Martine Jacot-Guillarmod, Cécile Diserens
The female athletic triad refers to the interaction between menstrual function, energy availability and bone density. When an imbalance appears between energy input and output, the global health of the athletic teenager is at risk of somatic and/or psychological complications as defined by the RED-S (Relative Energy Deficiency in Sports). In athletic girls menstrual disorder should be seen as an alert. It may be difficult to distinguish it from menstrual irregularity due to immature hypothalamic-hyphophysic-gonadal axis, which can be physiological at that age...
October 25, 2017: Revue Médicale Suisse
https://www.readbyqxmd.com/read/29066604/the-control-of-ventilation-during-exercise-a-lesson-in-critical-thinking
#13
Richard M Bruce
Learning the basic competencies of critical thinking are very important in the education of any young scientist, and teachers must be prepared to help students develop a valuable set of analytic tools. In my experience, this is best achieved by encouraging students to study areas with little scientific consensus, such as the control mechanisms of the exercise ventilatory response, as it can allow greater objectivity when evaluating evidence, while also giving students the freedom to think independently and problem solve...
December 1, 2017: Advances in Physiology Education
https://www.readbyqxmd.com/read/29065805/acute-white-matter-abnormalities-in-sports-related-concussion-a-diffusion-tensor-imaging-study-from-the-ncaa-dod-care-consortium
#14
Sourajit Mitra Mustafi, Jaroslaw Harezlak, Kevin M Koch, Andrew S Nencka, Timothy Meier, John D West, Christopher C Giza, John DiFiori, Kevin K Guskiewicz, Jason Mihalik, Stephen M LaConte, Stefan M Duma, Steven P Broglio, Andrew J Saykin, Michael McCrea, Thomas McAllister, Yu-Chien Wu
Sport-related concussion (SRC) is an important public health issue. While standardized assessment tools are useful in the clinical management of acute concussion, the underlying pathophysiology of SRC and the time course of physiological recovery after injury remain unclear. In this study, we used diffusion tensor imaging (DTI) to detect white-matter alterations in football players within 48 hours after SRC. As part of the NCAA-DoD CARE Consortium study of SRC, 30 American football players diagnosed with acute concussion, and 28 matched controls received clinical assessments and underwent advanced MRI scans...
October 25, 2017: Journal of Neurotrauma
https://www.readbyqxmd.com/read/29065054/the-importance-of-body-composition-in-the-national-hockey-league-combine-physiologic-assessments
#15
Nathan A Chiarlitti, Patrick Delisle-Houde, Ryan E R Reid, Cory Kennedy, Ross E Andersen
The National Hockey League (NHL) combine was designed to assess draft-eligible players based on body composition, speed, power, and strength. The importance of body composition in the battery of combine physical tests was investigated and differences in results based on position were explored. Thirty-seven elite male Canadian university hockey players (age = 22.86 ± 1.55 years, weight = 87.21 ± 6.52 kg, height = 181.69 ± 6.19 cm) participated in the study at the beginning of their hockey season. All participants underwent physical testing (as outlined in the 2016 NHL combine) and one total body dual energy x-ray absorptiometry (DXA) scan to measure body composition...
October 23, 2017: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/29053883/pharmacokinetics-of-inorganic-cobalt-and-a-vitamin-b12-supplement-in-the-thoroughbred-horse-differentiating-cobalt-abuse-from-supplementation
#16
L L Hillyer, Z Ridd, S Fenwick, P Hincks, S W Paine
BACKGROUND: Whilst cobalt is an essential micronutrient for vitamin B12 synthesis in the horse, at supra-physiological concentrations it has been shown to enhance performance in humans and rats and there is evidence that its administration in high doses to horses poses a welfare threat. Animal sport regulators currently control cobalt abuse via international race day thresholds, but since cobalt may be present in physiological concentrations this work was initiated to explore means of potentially adding to application of those thresholds...
October 20, 2017: Equine Veterinary Journal
https://www.readbyqxmd.com/read/29039018/the-activity-demands-and-physiological-responses-encountered-during-basketball-match-play-a-systematic-review
#17
REVIEW
Emilija Stojanović, Nenad Stojiljković, Aaron T Scanlan, Vincent J Dalbo, Daniel M Berkelmans, Zoran Milanović
BACKGROUND: Basketball is a popular, court-based team sport that has been extensively studied over the last decade. OBJECTIVE: The purpose of this article was to provide a systematic review regarding the activity demands and physiological responses experienced during basketball match-play according to playing period, playing position, playing level, geographical location, and sex. METHODS: An electronic database search of relevant articles published prior to 30 September 2016 was performed with PubMed, MEDLINE, ERIC, Google Scholar, SCIndex, and ScienceDirect...
October 16, 2017: Sports Medicine
https://www.readbyqxmd.com/read/29037377/thermographic-imaging-in-sports-and-exercise-medicine-a-delphi-study-and-consensus-statement-on-the-measurement-of-human-skin-temperature
#18
REVIEW
Danilo Gomes Moreira, Joseph T Costello, Ciro J Brito, Jakub G Adamczyk, Kurt Ammer, Aaron J E Bach, Carlos M A Costa, Clare Eglin, Alex A Fernandes, Ismael Fernández-Cuevas, José J A Ferreira, Damiano Formenti, Damien Fournet, George Havenith, Kevin Howell, Anna Jung, Glen P Kenny, Eleazar S Kolosovas-Machuca, Matthew J Maley, Arcangelo Merla, David D Pascoe, Jose I Priego Quesada, Robert G Schwartz, Adérito R D Seixas, James Selfe, Boris G Vainer, Manuel Sillero-Quintana
The importance of using infrared thermography (IRT) to assess skin temperature (tsk) is increasing in clinical settings. Recently, its use has been increasing in sports and exercise medicine; however, no consensus guideline exists to address the methods for collecting data in such situations. The aim of this study was to develop a checklist for the collection of tsk using IRT in sports and exercise medicine. We carried out a Delphi study to set a checklist based on consensus agreement from leading experts in the field...
October 2017: Journal of Thermal Biology
https://www.readbyqxmd.com/read/29035404/-biological-significance-of-chromium-iii-for-the-human-organism
#19
REVIEW
Anna Piotrowska, Wanda Pilch, Łukasz Tota, Gabriel Nowak
Currently, chromium is probably the most controversial transition metal. In recent publications it is clearly stated that it is not an essential micronutrient and should be considered to have a pharmacological effect. Conflicting scientific reports along with a huge amount of dietary supplements, as well as dietary and sports nutrients available on the market have prompted the authors to investigate the available information on the range of possible application, efficacy and safety of products containing salts or chelates of chromium III...
October 12, 2017: Medycyna Pracy
https://www.readbyqxmd.com/read/29022255/acute-and-chronic-response-to-exercise-in-athletes-the-supernormal-heart
#20
Antonello D'Andrea, Tiziana Formisano, Lucia Riegler, Raffaella Scarafile, Raffaella America, Francesca Martone, Marco di Maio, Maria Giovanna Russo, Eduardo Bossone, Maurizio Galderisi, Raffaele Calabrò
During last decades, most studies have examined the exercise-induced remodeling defined as "athlete's heart". During exercise, there is an increased cardiac output that causes morphological, functional, and electrical modification of the cardiac chambers. The cardiac remodeling depends also on the type of training, age, sex, ethnicity, genetic factors, and body size. The two main categories of exercise, endurance and strength, determine different effects on the cardiac remodeling. Even if most sport comprise both strength and endurance exercise, determining different scenarios of cardiac adaptation to the exercise...
2017: Advances in Experimental Medicine and Biology
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