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https://www.readbyqxmd.com/read/28091446/correlation-between-athlete-training-intensity-and-cardiac-performance
#1
T Xiao, Y Zhang
OBJECTIVE: An effective analysis of correlation between training intensity of athletes and cardiac performance is done to develop scientific and reasonable exercise program and to promote health of athletes. METHODS: During December 2013-December 2015, 3600 students from different sports schools were selected for the test. All the athletes were randomly grouped, that is half-hour running group, one-hour running group and 90 -minute running group, which are named A, B, C groups respectively...
February 2017: Nigerian Journal of Clinical Practice
https://www.readbyqxmd.com/read/28075521/association-between-adolescent-sport-activities-and-lumbar-disc-degeneration-among-young-adults
#2
Jani Takatalo, Jaro Karppinen, Simo Näyhä, Simo Taimela, Jaakko Niinimäki, Roberto Blanco Sequeiros, Tuija Tammelin, Juha Auvinen, Osmo Tervonen
The relationship between different sport activities and lumbar intervertebral disc degeneration (DD) is largely unknown. We evaluated whether adolescent participation in different sports is associated with lumbar DD in a population-based birth cohort of young adults. A total of 558 young adults (325 females and 233 males) underwent magnetic resonance imaging (MRI, 1.5-T scanner). A DD sum score, based on the Pfirrmann grading, was calculated for all lumbar levels. The sum score was categorized into no DD, 1, 2, or at least 3...
January 11, 2017: Scandinavian Journal of Medicine & Science in Sports
https://www.readbyqxmd.com/read/28051343/methodological-considerations-when-quantifying-high-intensity-efforts-in-team-sport-using-global-positioning-system-technology
#3
Matthew C Varley, Arne Jaspers, Werner F Helsen, James J Malone
Purpose Sprints and accelerations are popular performance indicators in applied sport. The methods used to define these efforts using athlete tracking technology could affect the number of efforts reported. The study aimed to determine the influence of different techniques and settings for detecting high-intensity efforts using Global Positioning System (GPS) data. Methods Velocity and acceleration data of a professional soccer match was recorded via 10-Hz GPS. Velocity data was filtered using either a median or exponential filter...
January 4, 2017: International Journal of Sports Physiology and Performance
https://www.readbyqxmd.com/read/28050921/influence-of-dietary-acid-load-on-exercise-performance
#4
Catherine Applegate, Mackenzie Mueller, Krystle E Zuniga
Diet composition can affect systemic pH and acid-base regulation, which may in turn influence exercise performance. An acidic environment in the muscle impairs performance and contributes to fatigue; therefore, current trends in sports nutrition place importance on maximizing the alkalinity of the body with ergogenic aids and dietary strategies. This review examines the evidence on the effects of dietary manipulations on acid load and exercise performance. Ten studies that investigated the effect of high versus low dietary acid loads on athletic performance generally identified that low dietary acid loads increased plasma pH, but did not consistently improve exercise performance at maximal or submaximal exercise intensities...
January 4, 2017: International Journal of Sport Nutrition and Exercise Metabolism
https://www.readbyqxmd.com/read/28050535/anterior-cruciate-ligament-and-meniscal-injuries-in-sports-incidence-time-of-practice-until-injury-and-limitations-caused-after-trauma
#5
Diego Costa Astur, Marcos Xerez, João Rozas, Pedro Vargas Debieux, Carlos Eduardo Franciozi, Moises Cohen
OBJECTIVE: To analyze the incidence of ACL and meniscal injuries in a population of recreational and elite athletes from Brazil and the relation of these injuries with their sports activities. METHODS: This was a prospective observational study of 240 patients with ACL and/or meniscal injuries submitted to surgical treatment. Data of patients and sport modality, as well as Tegner score were registered in the first clinical evaluation. The patients were divided into three groups: (1) isolated rupture of the ACL; (2) ACL injury associated with meniscal injury; (3) isolated menisci injury...
November 2016: Revista Brasileira de Ortopedia
https://www.readbyqxmd.com/read/28039074/caffeine-stimulates-voluntary-wheel-running-in-mice-without-increasing-aerobic-capacity
#6
Gerald C Claghorn, Zoe Thompson, Kristianna Wi, Lindsay Van, Theodore Garland
The "energy drink" Red Bull and the "sports drink" Gatorade are often marketed to athletes, with claims that they cause performance gains. However, both are high in sugars, and also consumed by non-athletes. Few studies have addressed the effects of these drinks or their biologically active components in rodent exercise models. We used three experiments to test effects on both voluntary exercise behavior and maximal aerobic capacity in lines of mice known to differ in "athletic" traits. Mice from four replicate High Runner (HR) lines have been selectively bred for voluntary running on wheels, and run approximately three times as many revolutions per day as do mice from four non-selected Control (C) lines...
December 28, 2016: Physiology & Behavior
https://www.readbyqxmd.com/read/28035865/effect-of-contact-and-no-contact-small-sided-games-on-elite-handball-players
#7
Antonio Dello Iacono, Domenico Martone, Alessandro Moura Zagatto, Yoav Meckel, Mahmood Sindiani, Mirjana Milic, Johnny Padulo
This study aimed to investigate the effect of contact (C-SSG) and no-contact (NC-SSG) handball small-sided games (SSGs) on motion patterns and physiological responses of elite handball players. Twelve male handball players performed 10 C-SSG and 10 NC-SSG while being monitored through the heart rate (HR) and rate of perceived exertion (RPE) as physiological responses and time-motion activities profile using video-match analysis. Both game conditions resulted in similar HR responses (P > 0.05), but the NC-SSG led to a higher RPE scores...
December 30, 2016: Journal of Sports Sciences
https://www.readbyqxmd.com/read/28028894/attacking-22-entries-in-rugby-union-running-demands-and-differences-between-successful-and-unsuccessful-entries
#8
P Tierney, D P Tobin, C Blake, E Delahunt
Global Positioning System (GPS) technology is commonly utilized in team sports, including rugby union. It has been used to describe the average running demands of rugby union. This has afforded an enhanced understanding of the physical fitness requirements for players. However, research in team sports has suggested that training players relative to average demands may underprepare them for certain scenarios within the game. To date, no research has investigated the running demands of attacking 22 entries in rugby union...
December 28, 2016: Scandinavian Journal of Medicine & Science in Sports
https://www.readbyqxmd.com/read/28025301/recrystallization-and-damage-of-ice-in-winter-sports
#9
Alexandra Seymour-Pierce, Ben Lishman, Peter Sammonds
Ice samples, after sliding against a steel runner, show evidence of recrystallization and microcracking under the runner, as well as macroscopic cracking throughout the ice. The experiments that produced these ice samples are designed to be analogous to sliding in the winter sport of skeleton. Changes in the ice fabric are shown using thick and thin sections under both diffuse and polarized light. Ice drag is estimated as 40-50% of total energy dissipation in a skeleton run. The experimental results are compared with visual inspections of skeleton tracks, and to similar behaviour in rocks during sliding on earthquake faults...
February 13, 2017: Philosophical Transactions. Series A, Mathematical, Physical, and Engineering Sciences
https://www.readbyqxmd.com/read/28007336/the-combined-frequency-of-igf-and-myostatin-polymorphism-among-track-field-athletes-and-swimmers
#10
Sigal Ben-Zaken, Yoav Meckel, Dan Nemet, Alon Eliakim
OBJECTIVE: The IGF C-1245T (rs35767) and the myostatin (MSTN) Lys(K)-153Arg(R) genetic polymorphism may influence skeletal muscle phenotypes and athletic performance. Carrying the minor IGF T allele and the myostatin rare R allele was associated with higher circulating IGF-I levels, greater muscle mass and improved performance. The aim of the present study was to assess the combined frequency of the IGF 1245T (rs35767) and MSTN 153Arg(R) polymorphism among Israeli track and field athletes (n=111) and swimmers (n=80)...
December 15, 2016: Growth Hormone & IGF Research
https://www.readbyqxmd.com/read/28002177/selected-physiological-perceptual-and-physical-performance-changes-during-two-bouts-of-prolonged-high-intensity-intermittent-running-separated-by-72-hours
#11
Nicholas Dobbin, Kevin Lamb, Craig Twist
This study investigated the effects of performing a second 90-minute intermittent running protocol 72 hours after an initial trial on selected physiological, perceptual and sprint running measures. Eight sub-elite soccer players provided measures of isokinetic muscle function, counter-movement jump (CMJ), 10 m sprinting, and muscle soreness before, and at 0, 24, 48 and 72 h after a 90-minute intermittent high intensity running bout (IHIR 1). A second 90-minute intermittent high intensity running bout (IHIR 2) was performed 72 h after the first...
December 8, 2016: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/27999729/a-non-operative-approach-to-the-management-of-chronic-exertional-compartment-syndrome-in-a-triathlete-a-case-report
#12
Cristiana Kahl Collins, Brad Gilden
BACKGROUND & PURPOSE: Chronic Exertional Compartment Syndrome (CECS) causes significant exercise related pain secondary to increased intra-compartmental pressure (ICP) in the lower extremities. CECS is most often treated with surgery with minimal information available on non-operative approaches to care. This case report presents a case of CECS successfully managed with physical therapy. STUDY DESIGN: Case report. CASE DESCRIPTION: A 34-year-old competitive triathlete experienced bilateral anterior and posterior lower leg pain measured with a numerical pain rating scale of 7/10 at two miles of running...
December 2016: International Journal of Sports Physical Therapy
https://www.readbyqxmd.com/read/27992260/a-three-week-unexpected-disturbance-program-improves-physical-performance-of-elite-female-athletes
#13
Jorg Teichmann, Edin K Suwarganda, C Martyn Beaven, Kim Hébert-Losier, Lee Jin Wei, Florencio Tenllado Vallejo, Philip Lew Chun Foong, Ramlan Abdul Aziz, Yeo Wee Kian, Dietmar Schmidtbleicher
CONTEXT: Sensorimotor training is commonly used in a rehabilitative setting; however, the effectiveness of an unexpected disturbance program (UDP) to enhance performance measures in uninjured elite athletes is unknown. OBJECTIVE: To assess the impact of a three-week UDP program on strength, power, and proprioceptive measures. DESIGN: Matched-group, pre- post design. SETTING: National Sports Institute. PARTICIPANTS: Twenty-one international-level female field hockey athletes...
December 19, 2016: Journal of Sport Rehabilitation
https://www.readbyqxmd.com/read/27984496/influence-of-clothing-on-thermoregulation-and-comfort-during-exercise-in-the-heat
#14
Jon-Kyle Davis, C Matt Laurent, Kimberly E Allen, Yang Zhang, Nicola I Stolworthy, Taylor R Welch, Michael E Nevett
Sport textiles of synthetic fiber have been proposed to have superior properties for keeping wearers cooler, drier, and more comfortable compared to natural fibers. The impact of various fiber content and fabric construction on thermoregulation and perceptual responses are not well understood. Eight male collegiate athletes performed three counter-balanced trials of 45-min treadmill run at 60% of maximal oxygen uptake in an environmental chamber (32°C). Three different fibers, consisting of 100% cotton, a blend of natural fibers (50/50% cotton/soybean), and a synthetic fiber (100% polyester) with mesh loops to facilitate ventilation through the clothing, were tested...
November 29, 2016: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/27977300/preventive-neuromuscular-training-for-young-female-athletes-comparison-of-coach-and-athlete-compliance-rates
#15
Dai Sugimoto, Carl G Mattacola, Heather M Bush, Staci M Thomas, Kim D Barber Foss, Gregory D Myer, Timothy E Hewett
CONTEXT:  Fewer athletic injuries and lower anterior cruciate ligament injury incidence rates were noted in studies of neuromuscular training (NMT) interventions that had high compliance rates. However, several groups have demonstrated that preventive NMT interventions were limited by low compliance rates. OBJECTIVE:  To descriptively analyze coach and athlete compliance with preventive NMT and compare the compliance between study arms as well as among school levels and sports...
December 15, 2016: Journal of Athletic Training
https://www.readbyqxmd.com/read/27942036/determinants-of-three-year-change-in-children-s-objectively-measured-sedentary-time
#16
Andrew J Atkin, Louise Foley, Kirsten Corder, Ulf Ekelund, Esther M F van Sluijs
BACKGROUND: Sedentary behaviours (SB) are highly prevalent in young people and may be adversely associated with physical and mental health. Understanding of the modifiable determinants of SB is necessary to inform the design of behaviour change interventions but much of the existing research is cross-sectional and focussed upon screen-based behaviours. PURPOSE: To examine the social, psychological and environmental determinants of change in children's objectively measured sedentary time from age 11 to 14 years...
2016: PloS One
https://www.readbyqxmd.com/read/27941488/no-differences-between-alter-g-trainer-and-active-and-passive-recovery-strategies-on-isokinetic-strength-systemic-oxidative-stress-and-perceived-muscle-soreness-after-exercise-induced-muscle-damage
#17
Matthew B Cooke, Carrie Nix, Lori Greenwood, Mike Greenwood
The incidence of muscle injuries is prevalent in elite sport athletes as well as weekend warriors and strategies that safely and effectively hasten recovery are highly desirable. The purpose of this study was to examine the differences between three recovery methods after eliciting muscle damage in recreationally active men relative to maximal isokinetic contractions, perceived muscle soreness and psychological mood states. Twenty-five recreationally active men (22.15±3.53yrs, 75.75±11.91kg, 180.52±7.3cm) were randomly matched by VO2 peak (53...
November 28, 2016: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/27939265/global-participation-in-sport-and-leisure-time-physical-activities-a-systematic-review-and-meta-analysis
#18
REVIEW
Ryan M Hulteen, Jordan J Smith, Philip J Morgan, Lisa M Barnett, Pedro C Hallal, Kim Colyvas, David R Lubans
This review aimed to determine the most popular physical activities performed by children, adolescents, and adults globally. Statistic bureau websites and article databases Scopus, ProQuest, SPORTDiscus, and Science Direct were searched between November 17th, 2014 and April 31st, 2015. Eligible studies were published in the last 10years with participation rates for specific physical activities among individuals five years or older. Data extraction for included articles (n=64) was assessed independently and agreed upon by two authors...
December 6, 2016: Preventive Medicine
https://www.readbyqxmd.com/read/27928207/the-agt-gene-m235t-polymorphism-and-response-of-power-related-variables-to-aerobic-training
#19
Zarębska Aleksandra, Jastrzębski Zbigniew, Moska Waldemar, Leońska-Duniec Agata, Kaczmarczyk Mariusz, Sawczuk Marek, Maciejewska-Skrendo Agnieszka, Żmijewski Piotr, Ficek Krzysztof, Trybek Grzegorz, Lulińska-Kuklik Ewelina, Ekaterina A Semenova, Ildus I Ahmetov, Cięszczyk Paweł
The C allele of the M235T (rs699) polymorphism of the AGT gene correlates with higher levels of angiotensin II and has been associated with power and strength sport performance. The aim of the study was to investigate whether or not selected power-related variables and their response to a 12-week program of aerobic dance training are modulated by the AGT M235T genotype in healthy participants. Two hundred and one Polish Caucasian women aged 21 ± 1 years met the inclusion criteria and were included in the study...
December 2016: Journal of Sports Science & Medicine
https://www.readbyqxmd.com/read/27918675/biomechanics-in-paralympics-implications-for-performance
#20
Floor Morriën, Matthew J D Taylor, Florentina J Hettinga
PURPOSE: To provide an overview of biomechanical studies in Paralympic research and their relevance for performance in Paralympic sports. METHODS: Search terms ' Paralympic Biomechanics', 'Paralympic Sport Performance', 'Paralympic Athlete Performance', and Paralympic Athlete' were entered into the electronic database PubMed. RESULTS: Thirty-four studies were included. Biomechanical studies in Paralympics mainly contributed to performance enhancement by technical optimization (n=32) and/or injury prevention (n=6)...
December 5, 2016: International Journal of Sports Physiology and Performance
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