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https://www.readbyqxmd.com/read/29457371/validation-of-a-blood-marker-for-plasma-volume-in-endurance-athletes-during-a-live-high-train-low-altitude-training-camp
#1
Louisa M Lobigs, Laura A Garvican-Lewis, Victor L Vuong, Nicolin Tee, Christopher J Gore, Peter Peeling, Brian Dawson, Yorck O Schumacher
Altitude is a confounding factor within the Athlete's Biological Passport (ABP) due, in part, to the plasma volume (PV) response to hypoxia. Here, a newly developed PV blood test is applied to assess the possible efficacy of reducing the influence of PV on the volumetric ABP markers; hemoglobin concentration ([Hb]) and the OFF-score. Endurance athletes (n=34) completed a 21 night simulated live high: train low protocol (14h.d-1 at 3000m). Bloods were collected twice pre-altitude, at days 3, 8 and 15 at altitude and 1, 7, 21 and 42 days post-altitude...
February 19, 2018: Drug Testing and Analysis
https://www.readbyqxmd.com/read/29455631/periosteal-flap-augmentation-of-the-modified-brostr%C3%A3-m-gould-procedure-for-chronic-lateral-ankle-instability
#2
Chee Ping Chew, Kevin Oon Thien Koo, Denny Tjiauw Tjoen Lie
INTRODUCTION: Chronic lateral ankle instability occurs in up to 20% of ankle injuries. Most can be treated conservatively, but surgical reconstruction is required if conservative treatment fails. Modified Broström-Gould procedure is an effective surgical treatment and the augmentation of this procedure with a periosteal flap may confer additional stability. We report on the outcome of a technique combining a modified Broström-Gould procedure augmented with a periosteal flap in patients with chronic lateral ankle instability...
January 2018: Journal of Orthopaedic Surgery
https://www.readbyqxmd.com/read/29453890/the-co-developmental-dynamic-of-sport-and-school-burnout-among-student-athletes-the-role-of-achievement-goals
#3
Matilda Sorkkila, Kaisa Aunola, Katariina Salmela-Aro, Asko Tolvanen, Tatiana V Ryba
Student-athletes who strive for success in high level sports while pursuing upper secondary education may be prone to sport and school burnout. The present study examined the co-developmental dynamic of sport and school burnout in Finnish adolescent student-athletes (N time 1 = 391; N time 2 = 373) across the first year of upper secondary school by using cross-lagged structural equation modeling (SEM). Furthermore, we used sport and school-related achievement goals as predictors of sport and school burnout, namely, sport and school-related exhaustion, cynicism, and feelings of inadequacy...
February 17, 2018: Scandinavian Journal of Medicine & Science in Sports
https://www.readbyqxmd.com/read/29453755/effect-of-nicotine-on-repeated-bouts-of-anaerobic-exercise-in-nicotine-na%C3%A3-ve-individuals
#4
Robert Johnston, Melissa Crowe, Kenji Doma
PURPOSE: Nicotine is a psychostimulant that is reported to be commonly supplemented by athletes. The purpose of the current study was to determine the effects of a rapidly absorbed form of nicotine on repeated bouts of anaerobic exercise, perception of exertion and a range of cardiovascular variables while monitoring side effect profiles. METHODS: Sixteen healthy, nicotine naïve male athletes (24.1 ± 5.3 years, 179.0 ± 8.8 cm, 81.7 ± 13.5 kg, BMI 25.5 ± 3.0, Body fat% 13...
February 16, 2018: European Journal of Applied Physiology
https://www.readbyqxmd.com/read/29453743/neuromuscular-control-deficits-and-the-risk-of-subsequent-injury-after-a-concussion-a-scoping-review
#5
REVIEW
David R Howell, Robert C Lynall, Thomas A Buckley, Daniel C Herman
An emerging area of research has identified that an increased risk of musculoskeletal injury may exist upon returning to sports after a sport-related concussion. The mechanisms underlying this recently discovered phenomenon, however, remain unknown. One theorized reason for this increased injury risk includes residual neuromuscular control deficits that remain impaired despite clinical recovery. Thus, the objectives of this review were: (1) to summarize the literature examining the relationship between concussion and risk of subsequent injury and (2) to summarize the literature for one mechanism with a theorized association with this increased injury risk, i...
February 17, 2018: Sports Medicine
https://www.readbyqxmd.com/read/29452425/clinical-evidence-on-dietary-supplementation-with-chia-seed-salvia-hispanica-l-a-systematic-review-and-meta-analysis
#6
Siew Li Teoh, Nai Ming Lai, Possatorn Vanichkulpitak, Vladimir Vuksan, Hoang Ho, Nathorn Chaiyakunapruk
Context: Chia seed is a popular dietary supplement, taken mainly for its high content of alpha-linolenic acid, vegetable protein, and dietary fiber, yet information about its clinical effects is lacking. Objective: This review aims to summarize the clinical evidence regarding the use of chia seed for a wide variety of health conditions. Data Sources: A number of databases, including PubMed and Embase, were searched systematically. Study Selection: Randomized controlled trials that assessed the clinical effects of chia seed consumption in human participants were included...
February 14, 2018: Nutrition Reviews
https://www.readbyqxmd.com/read/29450627/can-the-use-of-a-single-integrated-unitary-autonomic-index-provide-early-clues-for-eventual-eligibility-for-olympic-games
#7
Daniela Lucini, Roberto Sala, Antonio Spataro, Mara Malacarne, Manuela Benzi, Stefano Tamorri, Massimo Pagani
PURPOSE: Optimal autonomic regulation and stress resilience might be considered critical elements of athletic performance. We hypothesize that a novel unitary autonomic index for sports (ANSIs), together with a somatic stress related symptom score (4SQ) might help characterize athletes who were eventually selected for the Rio 2016 Olympic Games Italian team (Rio +). METHODS: In this retrospective study we examined 778 athletes (age 24.4 ± 6.7 yrs) who underwent a planned yearly pre-participation screening...
February 15, 2018: European Journal of Applied Physiology
https://www.readbyqxmd.com/read/29450501/temporal-estimation-in-prediction-motion-tasks-is-biased-by-a-moving-destination
#8
Jonathan C Flavell, Brendan T Barrett, John G Buckley, Julie M Harris, Andrew J Scally, Nathan B Beebe, Alice G Cruickshank, Simon J Bennett
An ability to predict the time-to-contact (TTC) of moving objects that become momentarily hidden is advantageous in everyday life and could be particularly so in fast-ball sports. Prediction motion (PM) experiments have sought to test this ability using tasks where a disappearing target moves toward a stationary destination. Here, we developed two novel versions of the PM task in which the destination either moved away from (Chase) or toward (Attract) the moving target. The target and destination moved with different speeds such that collision occurred 750, 1,000 or 1,250 ms after target occlusion...
February 1, 2018: Journal of Vision
https://www.readbyqxmd.com/read/29450207/fixation-of-traumatic-chondral-only-fragments-of-the-knee-in-pediatric-and-adolescent-athletes-a-retrospective-multicenter-report
#9
Peter D Fabricant, Yi-Meng Yen, Dennis E Kramer, Mininder S Kocher, Lyle J Micheli, J Todd R Lawrence, Theodore J Ganley, Benton E Heyworth
Background: While traditional biological principles have suggested that fragments consisting of cartilage alone cannot be reaffixed to bone with expectable long-term healing, case reports of successful healing after fixation in younger patients indicate that this concept remains incompletely explored. Purpose: To evaluate the presenting features, techniques, healing rates, and clinical and radiological results in a cohort of pediatric and adolescent athletes who underwent fixation of traumatic chondral-only fragments in the knee...
February 2018: Orthopaedic Journal of Sports Medicine
https://www.readbyqxmd.com/read/29450135/development-of-a-specific-index-to-detect-malnutrition-in-athletes-validity-in-weight-class-or-intermittent-fasted-athletes
#10
François D Desgorces, Christophe Moinard, Mounir Chennaoui, Jean-François Toussaint, Cyril Petibois, Philippe Noirez
Fasted or weight-category athletes manage their training under strict diet conditions that could impair the stress-recovery balance and result in acute or chronic fatigue. However, to date, no validated biomarker are available to quantify this phenomena. The aim of this study was to assess the validity of a specific index combining plasma albumin and weight change to detect nutrition-related risks of fatigue increase and under-performance in athletes experiencing particular nutritional conditions. An athlete's nutrition risk index (ANRI) equation, based on data from lightweight and heavyweight rowers, was developed using relationship between plasma albumin concentrations combined to weight changes with sport performance and overtraining scores and was tested by odds ratio for failure...
June 2017: Biochimie open
https://www.readbyqxmd.com/read/29449792/seric-concentrations-of-copper-chromium-manganesum-nickel-and-selenium-in-aerobic-anaerobic-and-mixed-professional-sportsmen
#11
Marcos Maynar, Francisco Llerena, Ignacio Bartolomé, Javier Alves, María-Concepción Robles, Francisco-Javier Grijota, Diego Muñoz
Background: The aim of the present study was to determine changes in serum concentrations of trace elements Cooper (Cu), Chromiun (Cr), Manganesum (Mn), Nickel (Ni) and Selenium (Se) in high-level sportsmen. Methods: Eighty professional athletes of different metabolic modalities, were recruited before the start of their training period. Thirty one sedentary participants of the same geographic area constituted the control group. Cu, Cr, Mn, Ni and Se analysis was performed by Inductively Coupled Plasma Mass Spectrometry (ICP-MS)...
2018: Journal of the International Society of Sports Nutrition
https://www.readbyqxmd.com/read/29449746/high-quality-carbohydrates-and-physical-performance-expert-panel-report
#12
Mitch Kanter
While all experts agreed that protein needs for performance are likely greater than believed in past generations, particularly for strength training athletes, and that dietary fat could sustain an active person through lower-intensity training bouts, current research still points to carbohydrate as an indispensable energy source for high-intensity performance.
January 2018: Nutrition Today
https://www.readbyqxmd.com/read/29449080/influence-of-exercise-modality-on-cardiac-parasympathetic-and-sympathetic-indices-during-post-exercise-recovery
#13
Scott Michael, Ollie Jay, Kenneth S Graham, Glen M Davis
OBJECTIVES: This study investigated indirect measures of post-exercise parasympathetic reactivation (using heart-rate-variability, HRV) and sympathetic withdrawal (using systolic-time-intervals, STI) following upper- and lower-body exercise. DESIGN: Randomized, counter-balanced, crossover. METHODS: 13 males (age 26.4±4.7years) performed maximal arm-cranking (MAX-ARM) and leg-cycling (MAX-LEG). Subsequently, participants undertook separate 8-min bouts of submaximal HR-matched exercise of each mode (ARM and LEG)...
February 12, 2018: Journal of Science and Medicine in Sport
https://www.readbyqxmd.com/read/29449002/shoulder-joint-kinetics-and-dynamics-during-underwater-forward-arm-elevation
#14
Jessy Lauer, João Paulo Vilas-Boas, Annie Hélène Rouard
Aquatic exercises are widely implemented into rehabilitation programs. However, both evaluating their mechanical demands on the musculoskeletal system and designing protocols to provide progressive loading are difficult tasks. This study reports for the first time shoulder joint kinetics and dynamics during underwater forward arm elevation performed at speeds ranging from 22.5 to 90°/s. Net joint moments projected onto anatomical axes of rotation, joint power, and joint work were calculated in 18 participants through a novel approach coupling numerical fluid flow simulations and inverse dynamics...
February 9, 2018: Journal of Biomechanics
https://www.readbyqxmd.com/read/29448827/outcomes-after-primary-repair-of-insertional-ruptures-of-the-achilles-tendon
#15
Oliver Nickolaas Schipper, Robert Bentley Anderson, Bruce E Cohen
BACKGROUND: Achilles tendon insertional sleeve avulsions occur when the Achilles distal tendon sleeve ruptures off of its insertion into the calcaneal tuberosity, sometimes with a small bony fragment from calcific tendinosis. Little evidence exists describing the outcomes and rerupture rate after operative management of Achilles tendon sleeve avulsions. METHODS: A retrospective chart review was performed to identify patients who sustained an Achilles sleeve avulsion injury treated with operative repair between October 2005 and July 2014...
February 1, 2018: Foot & Ankle International
https://www.readbyqxmd.com/read/29447910/preventing-non-contact-acl-injuries-in-female-athletes-what-can-we-learn-from-dancers
#16
Catherine Turner, Sarah Crow, Thomas Crowther, Brittany Keating, Trenton Saupan, Jason Pyfer, Kimberly Vialpando, Szu-Ping Lee
OBJECTIVES: To investigate the effects of dance experience and movement instruction on lower extremity kinematics and muscle activation during a landing task. DESIGN: Cross-sectional case control. SETTING: Laboratory setting. PARTICIPANTS: 27 female subjects (age 18-25) in 2 groups: dancers (n = 12) and non-dancers (n = 15). MAIN OUTCOME MEASURES: Lower extremity biomechanics during drop landing were analyzed...
December 23, 2017: Physical Therapy in Sport
https://www.readbyqxmd.com/read/29447400/prevalence-and-clinical-correlation-of-superficial-fungal-foot-infection-in-thai-naval-rating-cadets
#17
Punyawee Ongsri, Sumanas Bunyaratavej, Charussri Leeyaphan, Penvadee Pattanaprichakul, Pattachee Ongmahutmongkol, Chulaluk Komoltri, Kanokvalai Kulthanan
Background: Superficial fungal foot infection is one of the most important dermatological diseases currently affecting military personnel. Many Thai naval rating cadets are found to suffer from superficial fungal foot infections and their sequels. Objective: To investigate prevalence, potent risk factors, responding pathogens and clinical correlation of superficial fungal foot infection in Thai naval rating cadets training in Naval rating school, Sattahip, Thailand...
February 13, 2018: Military Medicine
https://www.readbyqxmd.com/read/29447303/arthroscopic-anterior-ankle-decompression-is-successful-in-national-football-league-players
#18
Christopher L McCrum, Justin W Arner, Bryson Lesniak, James P Bradley
Anterior ankle impingement is a frequent cause of pain and disability in athletes with impingement of soft-tissue or osseous structures along the anterior margin of the tibiotalar joint during dorsiflexion. In this study, we hypothesized that arthroscopic decompression of anterior ankle impingement would result in significant, reliable, and durable improvement in pain and range of motion (ROM), and would allow National Football League (NFL) players to return to their preoperative level of play. We reviewed 29 arthroscopic ankle débridements performed by a single surgeon...
January 2018: American Journal of Orthopedics
https://www.readbyqxmd.com/read/29446708/does-local-dynamic-stability-of-kayak-paddling-technique-affect-the-sports-performance-a-pilot-study
#19
Daniel Hamacher, Tobias Krebs, Guido Meyer, Astrid Zech
During competition, kayak athletes must optimally adapt to environmental factors (e.g. wind, waves) to achieve peak performance. However, the ability to adapt to such perturbations has never been assessed in kayak paddling. Therefore, the aim of the current study was to evaluate the local dynamic stability in sports technique of youth sprint kayak athletes. In a cross-sectional study, 14 healthy male athletes were recruited from an elite youth sprint kayak squad. During an incremental kayak ergometer test, mean power, heart rates and local dynamic technique stability of hands, arms, trunk and paddle were registered and the association with the athletes 2000 m free-water times were estimated using mixed models...
February 15, 2018: European Journal of Sport Science
https://www.readbyqxmd.com/read/29445615/thermodynamic-effects-of-commercially-available-ice-boots
#20
Madison N Quintanar, Tess Pu'uwaionalani Millar, Matthew A Burd
The limb of the equine athlete is subjected to all types of various stressors during exercise. To ensure the health of the horse and to prevent the possibility of lameness, it has been a common practice to apply cold therapy to the distal limb of the horse pre- and post-exercise. Commercially available boots are widely available for the application of cold therapy. To test the effectiveness of the boot, 6 healthy performance level sport type horses were exercised at a walk, trot, and canter in a round-pen and then subjected to the application of the ice boot for 20 minutes on a treatment leg, and no ice boot on an untreated leg...
2018: Open Veterinary Journal
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