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https://www.readbyqxmd.com/read/28334016/does-shoe-heel-design-influence-ground-reaction-forces-and-knee-moments-during-maximum-lunges-in-elite-and-intermediate-badminton-players
#1
Wing-Kai Lam, Jaejin Ryue, Ki-Kwang Lee, Sang-Kyoon Park, Jason Tak-Man Cheung, Jiseon Ryu
BACKGROUND: Lunge is one frequently executed movement in badminton and involves a unique sagittal footstrike angle of more than 40 degrees at initial ground contact compared with other manoeuvres. This study examined if the shoe heel curvature design of a badminton shoe would influence shoe-ground kinematics, ground reaction forces, and knee moments during lunge. METHODS: Eleven elite and fifteen intermediate players performed five left-forward maximum lunge trials with Rounded Heel Shoe (RHS), Flattened Heel Shoe (FHS), and Standard Heel Shoes (SHS)...
2017: PloS One
https://www.readbyqxmd.com/read/28326044/geographical-variations-in-the-interaction-of-relative-age-effects-in-youth-and-adult-elite-soccer
#2
Christina Steingröver, Nick Wattie, Joseph Baker, Werner F Helsen, Jörg Schorer
Selection biases based on the use of cut-off dates and the timing of athletes' birthdates have been termed relative age effects. These effects have been shown to differentially affect individuals involved in sport. For example, young male soccer players born early in their age group are overrepresented in elite teams while studies in adult soccer indicated potential carry-over effects from talent development systems. This two-study approach focuses on the processes within multi-year age groups in youth and adult elite soccer and on the role of players' age position within the age band with regard to players' birth year and birth month...
2017: Frontiers in Psychology
https://www.readbyqxmd.com/read/28301441/predictors-of-linear-and-multidirectional-acceleration-in-elite-soccer-players
#3
Northeast Jonathan, M Russell, D Shearer, C Cook, L Kilduff
Linear and multidirectional acceleration underpins success in professional soccer match-play. However, the physical qualities that determine these performance indicators are poorly understood in elite players. English Premier League players (n=26) performed isometric mid-thigh pulls (IMTP), bilateral and unilateral drop jumps (DJ; from 40 and 20 cm, respectively), bilateral and unilateral countermovement jumps (CMJ) and assessments of linear (5-, 10-, 20-m) and multidirectional (left/right pre-planned and reactive) acceleration...
March 13, 2017: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/28301437/transient-fatigue-is-not-influenced-by-ball-in-play-time-during-elite-rugby-league-matches
#4
M Waldron, E Thomson, J Highton, C Twist
The capacity to sustain high-speed running is important for rugby league players. Transient fatigue, described as a reduction in high-speed running in the 5-min after a peak 5-min period, is a phenomenon observed during rugby league matches. This concept has recently been questioned based on the proposed confounding influence of ball-in-play time during these periods. Therefore, this study examined the changes in high-speed running (> 14 km[BULLET OPERATOR]h) of elite rugby league players, as well as ball-in-play time, during the peak, subsequent and mean 5-min periods of five competitive matches using 5 Hz GPS devices...
March 13, 2017: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/28298059/groin-problems-in-male-soccer-players-are-more-common-than-previously-reported
#5
Joar Harøy, Ben Clarsen, Kristian Thorborg, Per Hölmich, Roald Bahr, Thor Einar Andersen
BACKGROUND: The majority of surveillance studies in soccer have used a time-;loss injury definition, and many groin problems result from overuse, leading to gradually increasing pain and/or reduced performance without necessarily causing an absence from soccer training or match play. Thus, the magnitude of groin problems in soccer has probably been underestimated in previous studies based on traditional injury surveillance methods. PURPOSE: To investigate the prevalence of groin problems among soccer players of both sexes and among male soccer players at different levels of play through a new surveillance method developed to capture acute and overuse problems...
February 1, 2017: American Journal of Sports Medicine
https://www.readbyqxmd.com/read/28288203/the-effects-of-menstrual-cycle-phase-on-physical-performance-in-female-soccer-players
#6
Ross Julian, Anne Hecksteden, Hugh H K Fullagar, Tim Meyer
BACKGROUND: Female soccer has grown extensively in recent years, however differences in gender-specific physiology have rarely been considered. The female reproductive hormones which rise and fall throughout the menstrual cycle, are known to affect numerous cardiovascular, respiratory, thermoregulatory and metabolic parameters, which in turn, may have implications on exercise physiology and soccer performance. Therefore, the main aim of the present study was to investigate potential effects of menstrual cycle phase on performance in soccer specific tests...
2017: PloS One
https://www.readbyqxmd.com/read/28282747/metabolic-power-and-energy-expenditure-in-an-international-men-s-hockey-tournament
#7
Ted Polglaze, Brian Dawson, Alec Buttfield, Peter Peeling
The purpose of this study was to ascertain the typical metabolic power characteristics of elite men's hockey, and whether changes occur within matches and throughout an international tournament. National team players (n = 16), divided into 3 positional groups (strikers, midfielders, defenders), wore Global Positioning System devices in 6 matches. Energetic (metabolic power, energy expenditure) and displacement (distance, speed, acceleration) variables were determined, and intensity was classified utilising speed, acceleration and metabolic power thresholds...
February 20, 2017: Journal of Sports Sciences
https://www.readbyqxmd.com/read/28281879/six-year-body-composition-change-in-male-elite-senior-rugby-league-players
#8
Ben Jones, Kevin Till, Gregory Roe, John O'Hara, Matthew Lees, Matthew J Barlow, Karen Hind
This study investigated the change in body composition and bone mineral content (BMC) of senior rugby league (RL) players between 2008 and 2014. Twelve male professional RL players (age, 24.6 ± 4.0 years; stature, 183.4 ± 8.4 cm) received a dual-energy X-ray absorptiometry scan during preseason in 2008 and 2014. Between 2008 and 2014, very likely increases in leg lean mass (LM), total trunk and leg BMC, and a likely increase in arm BMC and possible increases in body mass (BM), total and trunk fat mass (FM), and total, trunk and arm LM were observed...
March 10, 2017: Journal of Sports Sciences
https://www.readbyqxmd.com/read/28278378/subsequent-injuries-are-more-common-than-injury-recurrences
#9
Caroline F Finch, Jill Cook, Breanne E Kunstler, Muhammad Akram, John Orchard
BACKGROUND: It is known that some people can, and do, sustain >1 injury over a playing season. However, there is currently little high-quality epidemiological evidence about the risk of, and relationships between, multiple and subsequent injuries. PURPOSE: To describe the subsequent injuries sustained by Australian Football League (AFL) players over 1 season, including their most common injury diagnoses. STUDY DESIGN: Cohort study; Level of evidence, 3...
March 1, 2017: American Journal of Sports Medicine
https://www.readbyqxmd.com/read/28277424/comparing-performance-during-morning-vs-afternoon-training-sessions-in-intercollegiate-basketball-players
#10
Aaron D Heishman, Michael A Curtis, Ethan Saliba, Robert J Hornett, Steven K Malin, Arthur L Weltman
Time of day is a key factor that influences the optimization of athletic performance. Intercollegiate coaches oftentimes hold early morning strength training sessions for a variety of factors including convenience. However, few studies have specifically investigated the effect of early morning vs. late afternoon strength training on performance indices of fatigue. This is athletically important because circadian/ultradian rhythms and alterations in sleep patterns can impact training ability. Therefore, the purpose of the present study was to examine the effects of morning vs...
March 8, 2017: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/28271802/growth-maturation-and-exercise-during-youth-2016
#11
Jaak Jürimäe
For The Year that Was-2016, I have selected three papers in the area of growth, maturation, and exercise during youth. The year of 2016 was a successful year and it was not an easy task to highlight the most significant publications in this specific area of pediatric exercise science. The first paper has been chosen because it provides, for the first time, the growth and maturational status of elite junior tennis players belonging to the top eight players in the National rankings in various ages and compares against population norms...
February 2017: Pediatric Exercise Science
https://www.readbyqxmd.com/read/28271614/predicting-football-injuries-using-size-and-ratio-of-the-multifidus-and-quadratus-lumborum-muscles
#12
J A Hides, W R Stanton
Deficits in muscles of the lumbo-pelvic region, such as a relatively small multifidus muscle, have been used to predict lower limb injuries in professional football players. Results have been less consistent for the size of the quadratus lumborum (QL) muscle. Changes in size of the multifidus and QL muscles could be functionally related to each other, and modeling this relationship could improve prediction of lower limb injuries. Ultrasound imaging examinations were performed on male elite football players at the start of the Australian Football League (AFL) pre-season and playing season...
April 2017: Scandinavian Journal of Medicine & Science in Sports
https://www.readbyqxmd.com/read/28267868/validity-of-the-spex-sports-injury-surveillance-system-for-time-loss-and-medical-attention-injuries-in-sports
#13
M Møller, N Wedderkopp, G Myklebust, M Lind, H Sørensen, J J Hebert, C A Emery, J Attermann
The accurate measurement of sport exposure time and injury occurrence is key to effective injury prevention and management. Current measures are limited by their inability to identify all types of sport-related injury, narrow scope of injury information, or lack the perspective of the injured athlete. The aims of the study were to evaluate the proportion of injuries and the agreement between sport exposures reported by the SMS messaging and follow-up telephone part of the SMS, Phone, and medical staff Examination (SPEx) sports injury surveillance system when compared to measures obtained by trained on-field observers and medical staff (comparison method)...
March 7, 2017: Scandinavian Journal of Medicine & Science in Sports
https://www.readbyqxmd.com/read/28259770/a-prospective-investigation-of-changes-in-the-sensorimotor-system-following-sports-concussion-an-exploratory-study
#14
Julie A Hides, Melinda M Franettovich Smith, M Dilani Mendis, Nigel A Smith, Andrew J Cooper, Julia Treleaven, Felix Leung, Andrew J Gardner, Paul McCrory, Nancy L Low Choy
BACKGROUND: Sports concussion is a risk for players involved in high impact, collision sports. Post-concussion, the majority of symptoms subside within 7-10 days, but can persist in 10-20% of athletes. Understanding the effects of sports concussion on sensorimotor systems could inform physiotherapy treatment. OBJECTIVE: To explore changes in sensorimotor function in the acute phase following sports concussion. DESIGN: Prospective cohort study...
February 24, 2017: Musculoskelet Sci Pract
https://www.readbyqxmd.com/read/28254580/validation-of-an-inertial-measurement-unit-for-the-measurement-of-jump-count-and-height
#15
Kerry MacDonald, Roald Bahr, Jennifer Baltich, Jackie L Whittaker, Willem H Meeuwisse
OBJECTIVES: To validate the use of an inertial measurement unit (IMU) for the collection of total jump count and assess the validity of an IMU for the measurement of jump height against 3-D motion analysis. DESIGN: Cross sectional validation study. SETTING: 3D motion-capture laboratory and field based settings. PARTICIPANTS: Thirteen elite adolescent volleyball players. INDEPENDENT VARIABLES: Participants performed structured drills, played a 4 set volleyball match and performed twelve counter movement jumps...
December 7, 2016: Physical Therapy in Sport
https://www.readbyqxmd.com/read/28253042/monitoring-elite-soccer-players-external-loads-using-real-time-data
#16
Steve Barrett
PURPOSE: The principle aim of the study was to assess the validity of measuring locomotor activities and PlayerLoad using Real-Time (RT) data collection during soccer training. METHODS: Twenty-nine (n=29) English soccer players participated. Each player wore the same MEMS device (S5, Optimeye, CatapultSports, Melbourne, Australia) during twenty-one training sessions (n= 331 data sets) in the 2015/2016 and 2016/2017 season. A Real-Time receiver (TRX, Catapultsports, Melbourne, Australia) was used to collect the locomotor activities and PlayerLoad data in RT and compared with the post-event downloaded (PED) data...
March 2, 2017: International Journal of Sports Physiology and Performance
https://www.readbyqxmd.com/read/28251168/return-to-play-after-forearm-and-hand-injuries-in-the-national-basketball-association
#17
Kyle W Morse, Krystle A Hearns, Michelle Gerwin Carlson
BACKGROUND: Hand injuries can result in significant time away from competition for professional basketball players. Time to return to play after hand injuries in elite athletes has not been well described. PURPOSE: To report the return to play from metacarpal fractures, phalangeal fractures, and thumb ligament tears in National Basketball Association (NBA) players over a 5-year period. STUDY DESIGN: Descriptive epidemiology study. METHODS: The NBA transaction report was analyzed from January 2009 to May 2014...
February 2017: Orthopaedic Journal of Sports Medicine
https://www.readbyqxmd.com/read/28249346/increased-training-volume-improves-bone-density-and-cortical-area-in-adolescent-football-players
#18
Ian Varley, David C Hughes, Julie P Greeves, William D Fraser, Craig Sale
Habitual football participation has been shown to be osteogenic, although the specific volume of football participation required to cause bone adaptations are not well established. The aim of the present study is to investigate tibial bone adaptations in response to 12 weeks of increased training volume in elite adolescents who are already accustomed to irregular impact training. 99 male adolescent elite footballers participated (age 16±0 y; height 1.76±0.66 m; body mass 70.2±8.3 kg). Tibial scans were performed using peripheral quantitative computed tomography immediately before and 12 weeks after an increase in football training volume...
March 1, 2017: International Journal of Sports Medicine
https://www.readbyqxmd.com/read/28240702/utility-of-genetic-testing-in-elite-volleyball-players-with-aortic-root-dilation
#19
Nicole Herrick, Christopher Davis, Lisa Vargas, Hal Dietz, Paul Grossfeld
Basketball and volleyball attract individuals with a characteristic biophysical profile, mimicking features of Marfan Syndrome (MFS). Consequently, identification of these abnormalities can be lifesaving. PURPOSE: To determine how physical examination, echocardiography, and genetic screening can identify elite volleyball players with a previously undiagnosed aortopathy. METHODS: We have performed cardiac screening on 90 US Volleyball National Team members and identified four individuals with dilated sinuses of Valsalva...
February 25, 2017: Medicine and Science in Sports and Exercise
https://www.readbyqxmd.com/read/28229576/hormonal-responses-during-two-different-concurrent-training-trials-in-youth-elite-soccer-players-does-changing-the-organisation-of-training-impact-the-hormonal-response-to-concurrent-exercise
#20
Kevin Enright, James Morton, John Iga, Barry Drust
BACKGROUND: There are no data describing the acute hormonal responses to concurrent- training programmes in youth elite soccer players. Therefore, the aim of this study was to describe the total testosterone (T), cortisol (C), and growth hormone (hGH) responses during two same-day concurrent-training (CT) trials in elite soccer players. METHODS: n=13 youth elite players (age: 17.0±0.2 yrs; height, 1.80±0.07 m; body mass, 73.1±5.7 kg; VO2 max, 64.4±4.8ml-1.kg-1...
February 22, 2017: Journal of Sports Medicine and Physical Fitness
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