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Kevin D Martin, Jeffrey Wake, Laura Dawson, J Preston Van Buren
Background: The prevalence of Achilles tendon (AT) pathology is common and can result in disability. Understanding normal AT properties can improve our ability to prevent AT injuries. We examined the cross-sectional area of the AT at multiple levels in an asymptomatic population of Army Rangers. Methods: This is a prospective cohort study composed of 41 voluntarily recruited United States Army Rangers deployed in a combat theater. All subjects were members of the Ranger Regiment participating in more than 20 h of intense bipedal non-sport weekly training with no history of AT pathology...
March 14, 2018: Military Medicine
Jules Gellaerts, Evgeny Bogdanov, Farzin Dadashi, Benoit Mariani
Ski Mountaineering (SkiMo) is a fast growing sport requiring both endurance and technical skills. It involves different types of locomotion with and without the skis. The aim of this study is to develop and validate in the snowfield a novel inertial-based system for analysing cycle parameters and classifying movement in SkiMo in real-time. The study was divided into two parts, one focused on real-time parameters estimation (cadence, distance from strides, stride duration, stride length, number of strides, slope gradient, and power) and, second, on transition detection (kickturns, skin on, skin off, ski on and off backpack) in order to classify between the different types of locomotion...
March 16, 2018: Sensors
Jiaxin Liu, Lei Chen, Jan Felix Joseph, Alexandra Naß, Anna Stoll, Xavier de la Torre, Francesco Botrè, Gerhard Wolber, Maria Kristina Parr, Matthias Bureik
Anabolic androgenic steroids (AAS) are misused very frequently in sport competitions as performance enhancing agents. One of the doping compounds that has been detected with increased frequency in the last few years is dehydrochloromethyltestosterone (DHCMT, 4-chloro-17β-hydroxy-17α-methylandrosta-1,4-dien-3-one; brand name Oral Turinabol). The long-term DHCMT metabolite 20βOH-NorDHCMT (4-chloro-17β-hydroxymethyl-17α-methyl-18-norandrosta-1,4,13-trien-3-one) was reported earlier to be detectable in urine samples for more than 22 days after DHCMT administration; however, purified reference material was not available so far...
February 26, 2018: Journal of Inorganic Biochemistry
Joseph F Konopka, Robert L Buly, Bryan T Kelly, Edwin P Su, Alexander S McLawhorn
BACKGROUND: A significant number of patients who undergo hip arthroscopy will subsequently undergo total hip arthroplasty (THA) or hip resurfacing arthroplasty (HRA), although limited evidence exists regarding effects of prior hip arthroscopy on the outcomes of these procedures. METHODS: Of 5091 patients who underwent hip arthroscopy, we identified 69 patients who underwent subsequent THA (46) or HRA (23). Patients were matched to patients with no history of hip arthroscopy...
February 2, 2018: Journal of Arthroplasty
Jason C Tee, Sheree Bekker, Rob Collins, Jannie Klingbiel, Ivan van Rooyen, David van Wyk, Kevin Till, Ben Jones
OBJECTIVES: Due to the complex systems nature of injuries, the responsibility for injury risk management cannot lie solely within a single domain of professional practice. Interdisciplinary collaboration between technical/tactical coaches, strength and conditioning coaches, team doctors, physical therapists and sport scientists is likely to have a meaningful impact on injury risk. This study describes the application and efficacy of a multidisciplinary approach to reducing team injury risk in professional rugby union...
February 14, 2018: Journal of Science and Medicine in Sport
Michael L O'Byrne, Michael G McBride, Stephen Paridon, Elizabeth Goldmuntz
BACKGROUND: Obesity is associated with increased lifelong morbidity and reduced life span and is increasingly prevalent in the congenital heart disease population. Habitual exercise is an important aspect of a healthy lifestyle and primary prevention of obesity in the general population. The association between habitual activity and body mass index (BMI) has not been studied in children with congenital heart disease. METHODS: A cross-sectional analysis of two previously collected cohorts was performed, including participants 8 to 18 years old with tetralogy of Fallot, transposition of the great arteries, and single ventricle heart disease after a Fontan operation...
March 2018: World Journal for Pediatric & Congenital Heart Surgery
Cheng-Chen Pan, Christophe Maïano, Alexandre J S Morin
BACKGROUND: Little research has looked at the associations between sex, weight status and culture, and the physical self-perceptions and body dissatisfaction of individuals with intellectual disabilities (ID) involved in Special Olympics (SO) sports. AIMS: To examine sex- (male vs female), weight status- (non-overweight/obese vs. overweight/obese), and culture-based (North American vs. Asian) differences in physical self-concept and body dissatisfaction among SO athletes...
March 12, 2018: Research in Developmental Disabilities
Débora Finger, Fábio Juner Lanferdini, Juliano Boufleur Farinha, Clarissa Müller Brusco, Lucas Helal, Francesco Pinto Boeno, Eduardo Lusa Cadore, Ronei Silveira Pinto
INTRODUCTION: Protein (PRO) combined with a carbohydrate (CHO) beverage may have an ergogenic effect on endurance performance. However, evidence regarding its efficacy on similar conditions to athletes' race day is still lacking. OBJECTIVE: To compare the effect of three different nutritional supplementation strategies on performance and muscle recovery in a duathlon protocol. METHODS: , 13 male athletes (29.7 ± 7.7 years) participated in three simulated Olympic-distance duathlons under three different, randomly assigned, supplementation regimens: carbohydrate drink (CHO, 75 g); isocaloric CHO plus protein drink (CHO+PRO, 60...
March 15, 2018: Applied Physiology, Nutrition, and Metabolism, Physiologie Appliquée, Nutrition et Métabolisme
Krzysztof Karpowicz, Katarzyna Krych, Małgorzata Karpowicz, Witold Nowak, Piotr Gronek
The map of candidate genes that can potentially affect physical fitness becomes larger every year, and they are associated with such aspects as respiratory and cardiovascular stability; body build and composition - especially muscle mass and strength; carbohydrate and lipid metabolism; response to training; and exercise intolerance.The aim of this study was to analyze the relationship between the CA repeat polymorphism of the P1 promoter of the IGF1 gene and the structure of motor skills in the two groups of Polish young athletes in 2011-2013...
March 15, 2018: Acta Biochimica Polonica
Valentina Camomilla, Elena Bergamini, Silvia Fantozzi, Giuseppe Vannozzi
Recent technological developments have led to the production of inexpensive, non-invasive, miniature magneto-inertial sensors, ideal for obtaining sport performance measures during training or competition. This systematic review evaluates current evidence and the future potential of their use in sport performance evaluation. Articles published in English (April 2017) were searched in Web-of-Science, Scopus, Pubmed, and Sport-Discus databases. A keyword search of titles, abstracts and keywords which included studies using accelerometers, gyroscopes and/or magnetometers to analyse sport motor-tasks performed by athletes (excluding risk of injury, physical activity, and energy expenditure) resulted in 2040 papers...
March 15, 2018: Sensors
Enda F Whyte, Chris Richter, Siobhan O'Connor, Kieran A Moran
Anterior cruciate ligament (ACL) injuries frequently occur during side cutting maneuvers when fatigued or reacting to the sporting environment. Trunk and hip biomechanics are proposed to influence ACL loading during these activities. However, the effects of fatigue and unanticipation on the biomechanics of the kinetic chain may be limited by traditional discrete point analysis. We recruited twenty-eight male, varsity, Gaelic footballers (21.7±2.2 years; 178.7±14.6m; 81.8±11.4kg) to perform anticipated and unanticipated side cutting maneuvers pre- and post- a high intensity, intermittent exercise protocol (HIIP)...
March 13, 2018: Journal of Strength and Conditioning Research
Austin V Stone, Cale A Jacobs, Shane J Nho, Allston J Stubbs, Eric C Makhni
No abstract text is available yet for this article.
March 2018: American Journal of Sports Medicine
Kristian Thorborg, Lasse Ishøi, Otto Kraemer, Michael P Reiman, Per Hölmich
No abstract text is available yet for this article.
March 2018: American Journal of Sports Medicine
Kurt P Spindler, Laura J Huston, Kevin M Chagin, Michael W Kattan, Emily K Reinke, Annunziato Amendola, Jack T Andrish, Robert H Brophy, Charles L Cox, Warren R Dunn, David C Flanigan, Morgan H Jones, Christopher C Kaeding, Robert A Magnussen, Robert G Marx, Matthew J Matava, Eric C McCarty, Richard D Parker, Angela D Pedroza, Armando F Vidal, Michelle L Wolcott, Brian R Wolf, Rick W Wright
BACKGROUND: The long-term prognosis and risk factors for quality of life and disability after anterior cruciate ligament (ACL) reconstruction remain unknown. Hypothesis/Purpose: Our objective was to identify patient-reported outcomes and patient-specific risk factors from a large prospective cohort at a minimum 10-year follow-up after ACL reconstruction. We hypothesized that meniscus and articular cartilage injuries, revision ACL reconstruction, subsequent knee surgery, and certain demographic characteristics would be significant risk factors for inferior outcomes at 10 years...
March 2018: American Journal of Sports Medicine
Chris Brogden, Kelly Marrin, Richard Page, Matt Greig
CONTEXT: Clinical and functional assessments are performed regularly in sporting environments to screen for performance deficits and injury risk. Circadian rhythms have been demonstrated to affect human performance, however the influence of time of day on a battery of multiple ankle injury risk factors has yet to be established within athletic populations. OBJECTIVES: To investigate the influence of circadian variation on a battery of tests, used to screen for ankle aetiological risk factors...
March 15, 2018: Journal of Sport Rehabilitation
Yasmine Mosleh, Martin Cajka, Bart Depreitere, Jos Vander Sloten, Jan Ivens
Oblique impact is the most common accident situation that occupants in traffic accidents or athletes in professional sports experience. During oblique impact, the human head is subjected to a combination of linear and rotational accelerations. Rotational movement is known to be responsible for traumatic brain injuries. In this article, composite foam with a column/matrix composite configuration is proposed for head protection applications to replace single-layer uniform foam, to better attenuate rotational movement of the head during oblique impacts...
March 1, 2018: Proceedings of the Institution of Mechanical Engineers. Part H, Journal of Engineering in Medicine
Wuber J S Soares, Alexandre D Lopes, Eduardo Nogueira, Victor Candido, Suzana A Moraes, Monica R Perracini
This systematic review examines the association between physical activity (PA) level and risk of falling in community-dwelling older adults. A search of PubMed, Embase, CINAHL, Sport Discus, and Web of Science was performed in January 2017. Four prospective cohort studies investigating the incidence of falls in a period of at least 12 months and its association with the level of PA in people 60-plus years old were reviewed and pooled for meta-analysis. The pooled risk ratio for being a recurrent faller (2,420 participants) was 39% higher among those who were in the lowest PA level (RR = 1...
March 15, 2018: Journal of Aging and Physical Activity
Jonathan M Casper, Jung-Hwan Jeon
The purpose of this study was to examine psychological connection to the sport of pickleball by investigating active older adults (55 years and older) in relation to behavioral involvement and motives for participation. Data were collected via an online survey of a representative sample of active pickleball players in North Carolina (N = 690). The Psychological Continuum Model (PCM: Funk, 2008) categorized players into four distinct connection levels of Awareness, Attraction, Attachment, and Allegiance. Participants on each PCM level were analyzed based on playing length, play frequency, and motivations for participation (Competition, Diversion, Fitness, Skill Mastery, and Socialization)...
March 15, 2018: Journal of Aging and Physical Activity
Billy T Hulin, Tim J Gabbett, Rich D Johnston, David G Jenkins
PURPOSE: Determine: 1) how change of direction (COD) workloads influence PlayerLoad variables when controlling total distance covered, and 2) relationships among collision workloads and PlayerLoad variables during rugby league match-play. METHODS: Participants completed 3 protocols (crossover design) consisting of 10 repetitions of a 60 m effort in 15 s. The difference between each protocol was the COD demands required to complete 1 repetition; no COD (SL), 1 x 180º COD (1COD), or 3 x 180º COD (3COD)...
March 15, 2018: International Journal of Sports Physiology and Performance
Jackson Katz
This article outlines the origins, philosophy, and pedagogy of the Mentors in Violence Prevention (MVP) program, which has played a significant role in the gender violence prevention field since its inception in 1993. MVP was one of the first large-scale programs to target men for prevention efforts, as well as the first to operate systematically in sports culture and the U.S. military. MVP also introduced the "bystander" approach to the field. MVP employs a social justice, gender-focused approach to prevention...
March 1, 2018: Violence Against Women
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