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https://www.readbyqxmd.com/read/29145504/quantifying-performance-on-an-outdoor-agility-drill-using-foot-mounted-inertial-measurement-units
#1
Antonia M Zaferiou, Lauro Ojeda, Stephen M Cain, Rachel V Vitali, Steven P Davidson, Leia Stirling, Noel C Perkins
Running agility is required for many sports and other physical tasks that demand rapid changes in body direction. Quantifying agility skill remains a challenge because measuring rapid changes of direction and quantifying agility skill from those measurements are difficult to do in ways that replicate real task/game play situations. The objectives of this study were to define and to measure agility performance for a (five-cone) agility drill used within a military obstacle course using data harvested from two foot-mounted inertial measurement units (IMUs)...
2017: PloS One
https://www.readbyqxmd.com/read/29144964/biocultural-approach-of-the-association-between-maturity-and-physical-activity-in-youth
#2
André O Werneck, Danilo R P Silva, Paul Collings, Rômulo A Fernandes, Enio R V Ronque, Manuel J Coelho-E-Silva, Luís B Sardinha, Edilson S Cyrino
OBJECTIVE: To test the biocultural model through direct and indirect associations between biological maturation, adiposity, cardiorespiratory fitness, sadness, social relationships, and physical activity in adolescents. METHODS: This was a cross-sectional study conducted with 1152 Brazilian adolescents aged between 10 and 17 years. Somatic maturation was estimated through Mirwald's method (peak height velocity). Physical activity was assessed through Baecke questionnaire (occupational, leisure, and sport contexts)...
November 13, 2017: Jornal de Pediatria
https://www.readbyqxmd.com/read/29143267/hamstring-injury-prevention-practices-in-elite-sport-evidence-for-eccentric-strength-vs-lumbo-pelvic-training
#3
REVIEW
Anthony J Shield, Matthew N Bourne
Hamstring strain injuries are endemic in running-based sports. Given the economic and performance implications of these injuries, a significant body of research has emerged in recent years in an attempt to identify risk factors and develop or optimise injury prevention strategies. Surveys of injury prevention practices among medical and conditioning staff in elite sport suggest that many sporting clubs invest significant efforts in eccentric hamstring conditioning and lumbo-pelvic or trunk stability programmes...
November 15, 2017: Sports Medicine
https://www.readbyqxmd.com/read/29140134/a-nutrition-recovery-station-following-recreational-exercise-improves-fruit-consumption-but-does-not-influence-fluid-recovery
#4
Ben Desbrow, Katelyn Barnes, Caroline Young, Gregory R Cox, Chris Irwin
Immediate post-exercise access to fruit/fluid via a recovery "station" is a common feature of mass participation sporting events. Yet little evidence exists examining their impact on subsequent dietary intake. The aim of this study was to determine if access to fruit/water/sports drinks within a recovery station significantly alters dietary and fluid intakes in the immediate post-exercise period and influences hydration status the next morning. 127 (79 males) healthy participants (mean±SD, age=22.5±3.5y, body mass (BM)=73±13kg) completed two self-paced morning 10km runs separated by 1 week...
November 15, 2017: International Journal of Sport Nutrition and Exercise Metabolism
https://www.readbyqxmd.com/read/29139646/physical-fitness-and-digit-ratio-2d-4d-in-male-students-from-wroc%C3%A5-aw-poland
#5
Slawomir Koziel, Marek Kociuba Mail, Raja Chakraborty, Zofia Ignasiak
There is sex-difference in humans as regards aerobic efficiency, physical strength and endurance and the sex difference is greatly dependent upon differential concentration of testosterone during different phases of growth and development including the intrauterine phase or prenatal growth. Second-to-fourth digit lengths ratio (2D:4D) is an putative indicator of prenatal testosterone exposure. Lower 2D:4D indicates higher prenatal testosterone exposure and vice versa. Males generally have lower 2D:4D than females...
March 2017: Collegium Antropologicum
https://www.readbyqxmd.com/read/29135785/comparison-of-polar-m600-optical-heart-rate-and-ecg-heart-rate-during-exercise
#6
John F Horton, Pro Stergiou, Tak S Fung, Larry Katz
PURPOSE: The purpose of this study was to evaluate the accuracy of the Polar M600 optical heart rate (OHR) sensor compared with ECG heart rate (HR) measurement during various physical activities. METHODS: Thirty-six subjects participated in a continuous 76-min testing session, which included rest, cycling warm-up, cycling intervals, circuit weight training, treadmill intervals, and recovery. HR was measured using a three-lead ECG configuration and a Polar M600 Sport Watch on the left wrist...
December 2017: Medicine and Science in Sports and Exercise
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/29129021/the-effect-of-natural-or-simulated-altitude-training-on-high-intensity-intermittent-running-performance-in-team-sport-athletes-a-meta-analysis
#8
REVIEW
Michael J Hamlin, Catherine A Lizamore, Will G Hopkins
BACKGROUND: While adaptation to hypoxia at natural or simulated altitude has long been used with endurance athletes, it has only recently gained popularity for team-sport athletes. OBJECTIVE: To analyse the effect of hypoxic interventions on high-intensity intermittent running performance in team-sport athletes. METHODS: A systematic literature search of five journal databases was performed. Percent change in performance (distance covered) in the Yo-Yo intermittent recovery test (level 1 and level 2 were used without differentiation) in hypoxic (natural or simulated altitude) and control (sea level or normoxic placebo) groups was meta-analyzed with a mixed model...
November 11, 2017: Sports Medicine
https://www.readbyqxmd.com/read/29126337/factors-predicting-lower-leg-chronic-exertional-compartment-syndrome-in-a-large-population
#9
Johan A de Bruijn, Aniek P M van Zantvoort, David van Klaveren, Michiel B Winkes, Marike van der Cruijsen-Raaijmakers, Adwin R Hoogeveen, Joep A W Teijink, Marc R Scheltinga
Knowledge about lower leg chronic exertional compartment syndrome (CECS) is largely obtained from highly selected populations. Patient characteristics may therefore not be appropriate for the general population. Our purpose was to describe a heterogeneous population of individuals suspected of lower leg CECS and to identify predictors of CECS. Charts of individuals who were analyzed for exercise-induced lower leg pain in a referral center between 2001 and 2013 were retrospectively studied. Patients were included if history and physical examination were suggestive of CECS and if they had undergone a dynamic intracompartmental pressure measurement...
November 10, 2017: International Journal of Sports Medicine
https://www.readbyqxmd.com/read/29120988/measuring-vertical-stiffness-in-sport-with-accelerometers-exercise-caution
#10
Tahleya M Eggers, Tim I Massard, Peter J Clothier, Ric Lovell
This study aimed to determine the measurement accuracy of triaxial accelerometers to determine vertical stiffness (Kvert) during overground running, and to examine the influence of device location. Seventeen healthy adults wore two triaxial accelerometers (positioned between scapulae and at lumbar spine) during a 2 min continuous 20 m shuttle run (12 km⋅h), which was repeated 7-d later. Accelerometer-derived Kvert data was compared to that calculated from corresponding force-plate ground contacts (criterion measure)...
November 6, 2017: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/29117428/change-in-knee-flexor-torque-after-fatiguing-exercise-identifies-previous-hamstring-injury-in-football-players
#11
Cameron Lord, Fadi Ma'ayah, Anthony J Blazevich
PURPOSE: Muscular fatigue and inter-limb strength asymmetry are factors known to influence hamstring injury risk, however limb-specific exacerbation of knee flexor (hamstrings) torque production after fatiguing exercise has previously been ignored. To investigate changes in muscular force production before and after sport-specific (repeated-sprint) and non-specific (knee extension-flexion) fatiguing exercise, and explore the sensitivity and specificity of isokinetic endurance (i.e. muscle-specific) and single-leg vertical jump (i...
November 8, 2017: Scandinavian Journal of Medicine & Science in Sports
https://www.readbyqxmd.com/read/29112280/characterization-and-correlates-of-exercise-among-adolescents-with-anorexia-nervosa-and-bulimia-nervosa
#12
Jason M Nagata, Jennifer L Carlson, Jessica M Kao, Neville H Golden, Stuart B Murray, Rebecka Peebles
OBJECTIVE: To characterize exercise behaviors among adolescents with anorexia nervosa (AN), atypical AN, or bulimia nervosa (BN), and determine associations between exercise and medical risk. STUDY DESIGN: Cross-sectional electronic medical records of all patients evaluated by the Eating Disorder Program at Stanford between January 1997 and February 2011 were retrospectively reviewed. RESULTS: 1,083 subjects (961 females, 122 males; mean age 15...
November 7, 2017: International Journal of Eating Disorders
https://www.readbyqxmd.com/read/29112054/lower-extremity-stiffness-considerations-for-testing-performance-enhancement-and-injury-risk
#13
Jon Brazier, Sean Maloney, Chris Bishop, Paul J Read, Anthony N Turner
Brazier, J, Maloney, S, Bishop, C, Read, PJ, and Turner, AN. Lower extremity stiffness: considerations for testing, performance enhancement, and injury risk. J Strength Cond Res XX(X): 000-000, 2017-Force-deformation characteristics of the lower limb have been associated with athletic performance and may modulate the risk of injury. Despite these known associations, measurements of lower extremity stiffness are not commonly administered by strength and conditioning coaches. This review provides an overview of the available literature pertaining to the effects of lower extremity stiffness on physical performance and injury risk...
November 1, 2017: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/29105001/design-of-projectrun21-a-14-week-prospective-cohort-study-of-the-influence-of-running-experience-and-running-pace-on-running-related-injury-in-half-marathoners
#14
Camma Damsted, Erik Thorlund Parner, Henrik Sørensen, Laurent Malisoux, Rasmus Oestergaard Nielsen
BACKGROUND: Participation in half-marathon has been steeply increasing during the past decade. In line, a vast number of half-marathon running schedules has surfaced. Unfortunately, the injury incidence proportion for half-marathoners has been found to exceed 30% during 1-year follow-up. The majority of running-related injuries are suggested to develop as overuse injuries, which leads to injury if the cumulative training load over one or more training sessions exceeds the runners' load capacity for adaptive tissue repair...
November 6, 2017: Injury Epidemiology
https://www.readbyqxmd.com/read/29093825/an-outbreak-of-leptospirosis-among-united-states-military-personnel-in-guam
#15
Alyson J Brinker, David L Blazes
Background: Leptospirosis is a bacterial zoonotic disease with worldwide distribution. Case presentation: We describe and discuss the clinical course of a leptospirosis outbreak in a running club called the hash house harriers on Guam. Conclusions: Leptospirosis is a potentialy life threatening disease, and has had a reemergence given the popularity of travel adventure sports, teams, and clubs around the world. This case presentation highlights the robust prescence of leptospirosis on Guam...
2017: Tropical Diseases, Travel Medicine and Vaccines
https://www.readbyqxmd.com/read/29091470/acute-ingestion-of-caffeinated-chewing-gum-improves-repeated-sprint-performance-of-team-sports-athletes-with-low-habitual-caffeine-consumption
#16
Mark Evans, Peter Tierney, Nicola Gray, Greg Hawe, Maria Macken, Brendan Egan
The effects of acute ingestion of caffeine on short-duration high intensity performance are equivocal, while studies of novel modes of delivery and the efficacy of low doses of caffeine are warranted. The aims of the present study were to investigate the effect of acute ingestion of caffeinated chewing gum on repeated sprint performance (RSP) in team sport athletes, and whether habitual caffeine consumption alters the ergogenic effect, if any, on RSP. Eighteen male team sports athletes undertook four RSP trials using a 40 m maximum shuttle run test (MST), which incorporates 10x40 m sprints with 30 s between the start of each sprint...
November 1, 2017: International Journal of Sport Nutrition and Exercise Metabolism
https://www.readbyqxmd.com/read/29079672/fast-tracked-rehabilitation-and-return-to-sport-of-an-elite-rugby-player-with-a-complicated-posterolateral-corner-injury-and-associated-peroneal-paralysis
#17
L D A Paget, P P F M Kuijer, M Maas, G M M J Kerkhoffs
Acute posterolateral corner injuries of the knee with associated hamstring avulsions and peroneal paralysis are rare in rugby. Regain of motor function following a complete paralysis is documented to be 38%. To our knowledge, only one case describes return to preinjury level of competitive sport taking up to 27 months. A 24-year-old international level rugby player, a medical student, sustained an acute posterolateral knee injury with associated anterior cruciate ligament tear, bicep femoris and semimembranosus avulsions as well as a complete peroneal paralysis...
October 27, 2017: BMJ Case Reports
https://www.readbyqxmd.com/read/29071112/the-first-prospective-injury-audit-of-league-of-ireland-footballers
#18
Nigel Fitzharris, Gareth Jones, Ashley Jones, Peter Francis
OBJECTIVES: Football has the highest sports participation (10.6%) in Ireland ahead of its Gaelic counterpart (3.9%). Research into injury incidence and patterns in Irish football is non-existent. The aim of this study was to conduct a prospective injury audit of League of Ireland (semiprofessional) footballers during the 2014 season (8 months, 28 games). METHODS: A total of 140 semiprofessional League of Ireland footballers were prospectively followed between March and November 2014...
2017: BMJ Open Sport & Exercise Medicine
https://www.readbyqxmd.com/read/29060430/concussion-management-application-for-amateur-sports
#19
J D Fischer, G H Smith, R S Rodrigues, M R Afzal, D J van den Heever, P L Viviers, J T Viljoen
Concussion management has become one of the most popular topics in sports medicine. Significant resources are being invested in developing protocols for professional sport associations such as the NFL and FIFA. These protocols are often expensive and require substantial resources to implement. The problem, however, runs much deeper than just professional sports. Currently there exists little infrastructure to effectively manage concussion in amateur settings such as high school, club and university sport. A more holistic approach is required to ensure that the same standard of concussion management is being implemented across the board, regardless of the available medical and financial resources...
July 2017: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/29055242/the-efficacy-of-two-activity-based-interventions-in-adolescents-with-developmental-coordination-disorder
#20
Emmanuel Bonney, Gillian Ferguson, Bouwien Smits-Engelsman
BACKGROUND: Adolescents with Developmental Coordination Disorder (DCD) usually experience psychomotor difficulties that affect their participation in everyday tasks and sports. Without effective intervention, adolescents show persistent motor deficits through adulthood. It is therefore critical to develop interventions to address the specific needs of this population. Studies evaluating the impact of motor interventions among adolescents with DCD are limited. AIM: The study evaluated the efficacy of two activity-based motor interventions in female adolescents with DCD...
October 18, 2017: Research in Developmental Disabilities
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