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Journal of Sports Medicine and Physical Fitness

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https://www.readbyqxmd.com/read/28094489/the-sex-specific-internal-and-external-demands-imposed-on-players-during-ultimate-frisbee-game-play
#1
Maria C Madueno, Crystal O Kean, Aaron T Scanlan
BACKGROUND: Despite the growing popularity of Ultimate Frisbee (UF) across sexes, the game demands imposed on players have been predominately examined in males. This study aimed to compare the internal and external demands of UF game-play in males and females. METHODS: Male (N = 10) and female (N = 10) recreational UF players competed in separate sex-specific, indoor UF games. Internal responses (blood lactate concentration ([BLa-]), rating of perceived exertion (RPE), and heart rate (HR)) and external responses (direction-specific and total relative (·min-1) PlayerLoadTM (PL), and Estimated Equivalent Distance (EED)) were measured...
January 17, 2017: Journal of Sports Medicine and Physical Fitness
https://www.readbyqxmd.com/read/28094488/effects-of-leg-contrast-strength-training-on-sprint-agility-and-repeated-change-of-direction-performance-in-male-soccer-players
#2
Mehréz Hammami, Yassine Negra, Roy J Shephard, Mohamed Souhaiel Chelly
BACKGROUND: Contrast training is popular technique among individuals who are involved in dynamic sports, having as its goal an increase in dynamic muscular performance. It is characterized by the use of high and low loads in the same strength training session. The present investigation aimed to determine the effects of adding 8--weeks of contrast strength training (CSTP) to regular soccer practice in U--17 male soccer players during the competitive season. We hypothesized that CSTP would enhance their performance...
January 17, 2017: Journal of Sports Medicine and Physical Fitness
https://www.readbyqxmd.com/read/28094487/blood-doping-at-the-olympic-games
#3
Kenneth D Fitch
BACKGROUND: The objective of this paper was to review our knowledge of athletes who have, are believed to have or have attempted to engage in blood doping to enhance their performance at an Olympic Games. METHOD: The paper focused on the Games from Munich 1972 to London 2012 and the author had a medical role at each of the Olympics that is discussed. RESULTS: The study revealed that Olympic athletes have benefitted from manipulating their blood by re--infusion of autologous or infusion of homologous blood and by administering erythropoiesis stimulating agents, notably the three generations of erythropoietins...
January 17, 2017: Journal of Sports Medicine and Physical Fitness
https://www.readbyqxmd.com/read/28085132/peak-versus-mean-propulsive-power-outputs-which-variable-is-more-related-to-jump-squat-performance
#4
Irineu Loturco, Lucas A Pereira, Ronaldo Kobal, Katia Kitamura, Cesar C Cal Abad, Fábio Y Nakamura, Chi N Pai
BACKGROUND: This study aimed to compare the predictive value of muscle power (peak power, mean power until the peak-velocity or mean propulsive power) in relation to the jump height achieved during the jump squat performed at different loads. METHODS: One hundred and ninety-four elite athletes performed jump squats against loads corresponding to 40%, 60%, and 80% of their respective body-mass. A linear regression analysis was performed to establish the relationship between muscle power expressions and jump squat height...
January 13, 2017: Journal of Sports Medicine and Physical Fitness
https://www.readbyqxmd.com/read/28085131/differences-in-anthropometric-characteristics-in-relation-to-throwing-velocity-and-competitive-level-in-professional-male-team-handball-a-tool-for-talent-profiling
#5
Georg Fieseler, Souhail Hermassi, Birgit Hoffmeyer, Stephan Schulze, Lars Irlenbusch, Thomas Bartels, Karl S Delank, Kevin G Laudner, René Schwesig
BACKGROUND: The primary aim of the study was to examine the anthropometric characteristics as well as throwing and sprinting performance of professional handball players classified by playing position and competition level. METHODS: 21 male players (age: 25.2 ± 5.1 years) from the first German handball league (FGL) and 34 male players (age: 26.1 ± 4.1 years) from the third German handball league (TGL) were categorized as backs, pivots, wings and goalkeepers. Measurements included anthropometric data (height, mass and body mass index (BMI)), throwing and sprinting performance selected out of a complex handball test (HBCT), which was conducted twice (2 rounds)...
January 13, 2017: Journal of Sports Medicine and Physical Fitness
https://www.readbyqxmd.com/read/28085130/body-composition-and-size-in-sprint-athletes
#6
Davide Barbieri, Luciana Zaccagni, Vesna Babić, Marija Rakovac, Marjeta Mišigoj-Duraković, Emanuela Gualdi-Russo
BACKGROUND: The aim of the study was to assess competitive sprinters' body size and composition and to determine their impact on performance. METHODS: Ninety-eight competitive male sprinters (100 m) participated in this cross sectional study. A series of measurements was directly taken and data on muscular strength and power tests were self-reported. Body composition was assessed by skinfold method and somatotype was calculated by the Heath-Carter anthropometric method...
January 13, 2017: Journal of Sports Medicine and Physical Fitness
https://www.readbyqxmd.com/read/28085129/leg-stiffness-valgus-knee-motion-and-q-angle-are-associated-with-hypertrophic-soft-patella-tendon-and-idiopathic-knee-pain-in-adolescent-basketball-players
#7
Danguole Satkunskiene, Mantas Mickevicius, Audrius Snieckus, Sigitas Kamandulis
BACKGROUND: Knee pain without knee degenerative symptoms is a common phenomenon among young basketball players. The aim of this study was to identify factors predisposing young basketball players to suffer from knee pain. METHODS: The study involved 20 male adolescent (14 - 15 years) basketball players who were divided into 2 equal groups based on knee pain symptoms. Legs torque was tested on an isokinetic dynamometer. The length, elongation and the cross-sectional area (CSA) of the patellar tendon were measured with ultrasonography...
January 13, 2017: Journal of Sports Medicine and Physical Fitness
https://www.readbyqxmd.com/read/28085128/shuttle-swimming-test-in-young-water-polo-players-reliability-responsiveness-and-age-related-value
#8
Giovanni Melchiorri, Valerio Viero, Tamara Triossi, Elvira Padua, Marco Bonifazi
BACKGROUND: This study investigated the applicability of a sport-specific test, the Shuttle Swim Test, in young water polo players to measure RSA. The aims were: to assess the reliability and to measure the responsiveness of the SST in young water polo athletes, and to provide age- related values of SST. METHODS: 333 elite athletes (18.3 ± 5.1 years) were involved in the study. Of these, 99 were young people under 13 (13.1 ± .5 years) who also underwent measurements for reliability and responsiveness of the SST The following six measures was used to assess anthropometric characteristics of the sample: height, weight, chest circumference, hip circumference, waist circumference, and arm span...
January 13, 2017: Journal of Sports Medicine and Physical Fitness
https://www.readbyqxmd.com/read/28085127/high-intensity-interval-training-and-athletic-performance-in-taekwondo-athletes
#9
Lynne Monks, Myong W Seo, Hyun B Kim, Hyun C Jung, Jong K Song
BACKGROUND: The purpose of this study was to determine the effects of high intensity interval training (HIIT) on athletic performance in Taekwondo athletes. METHODS: Thirty-three male and female collegiate Taekwondo athletes were randomly divided into a HIIT group (N=16) or a high intensity continuous running (HICR) group (N=17). The HIIT group undertook training of high intensity sprints interspersed with active rest periods whilst the HICR group participated in high intensity running for a continuous period...
January 13, 2017: Journal of Sports Medicine and Physical Fitness
https://www.readbyqxmd.com/read/28085126/the-effect-of-acute-fatigue-on-countermovement-jump-performance-in-rugby-union-players-during-preseason
#10
Rodney A Kennedy, David Drake
BACKGROUND: A countermovement jump (CMJ) is routinely used in many sporting settings to provide a functional measure of neuromuscular fatigue. However, the variables that are most sensitive to fatigue remain somewhat unclear. The purpose of this study was to determine the acute changes in neuromuscular fatigue in rugby union players during a period of preseason training. METHODS: Nine male (age: 19.0 ± 1.5 years) academy rugby union players performed five CMJ trials on three occasions, at baseline, 24 hours and 48 hours post-baseline...
January 13, 2017: Journal of Sports Medicine and Physical Fitness
https://www.readbyqxmd.com/read/28085125/evaluation-of-hydration-status-by-urine-body-mass-variation-and-plasma-parameters-during-an-official-half-marathon
#11
Emerson R Pereira, Marcelo T DE Andrade, Thiago T Mendes, Guilherme P Ramos, André Maia-Lima, Eliney S Melo, Moisés V Carvalho, Carolina F Wilke, Luciano S Prado, Emerson Silami-Garcia
BACKGROUND: The aim of this study was to verify the agreement of urine, body mass variations and plasma parameters to determine the hydration status of 14 male runners (29 ± 4 years and 54.3 ± 5.5 mLO2.kg-1.min-1) in an official 21.1 km road race. METHODS: The mean dry-bulb temperature and air relative humidity during the road race were 25.1 ± 2.1° C and 54.7 ± 2.2%, respectively. The volume of water ingested by the runners was monitored using marked volumetric plastic bottles provided at the hydration stations located at 0, 2...
January 13, 2017: Journal of Sports Medicine and Physical Fitness
https://www.readbyqxmd.com/read/28085124/remnant-preservation-in-anterior-cruciate-ligament-reconstruction-versus-standard-techniques-a-meta-analysis-of-randomized-controlled-trials
#12
Tianjun Ma, Chun Zeng, Jianying Pan, Chang Zhao, Hang Fang, Daozhang Cai
BACKGROUND: Preserving the remnant during anterior cruciate ligament (ACL) reconstruction is considered beneficial for graft healing, but it might increase the technical difficulties and complications. This study was to compare outcomes of using the technique of remnant preservation during the ACL reconstruction versus the standard procedure with the debridement of remnant. METHODS: We searched PubMed and EMBASE databases and the Cochrane Library for randomized controlled trials comparing the outcomes of ACL reconstruction both with and without remnant preservation...
January 13, 2017: Journal of Sports Medicine and Physical Fitness
https://www.readbyqxmd.com/read/28085123/rates-and-risk-factors-of-injury-in-crossfit-a-prospective-cohort-study
#13
Sebastian Moran, Harry Booker, Jacob Staines, Sean Williams
BACKGROUND: CrossFitTM is a strength and conditioning programme that has gained widespread popularity since its inception approximately 15 years ago. However, at present little is known about the level of injury risk associated with this form of training. Movement competency, assessed using the Functional Movement ScreenTM (FMS), has been identified as a risk factor for injury in numerous athletic populations, but its role in CrossFit participants is currently unclear. The aim of this study was to evaluate the level of injury risk associated with CrossFit training, and examine the influence of a number of potential risk factors (including movement competency)...
January 13, 2017: Journal of Sports Medicine and Physical Fitness
https://www.readbyqxmd.com/read/28085122/effect-of-7-minute-workout-on-weight-and-body-composition
#14
Lama E Mattar, Natali H Farran, Dalal A Bakhour
BACKGROUND: The 7-minute workout composed of aerobic and resistance exercises is becoming a very popular workout. It targets individuals with time constrains and low motivation to commit to lengthy and extensive workout programs. The objective of the study is to investigate if the 7-minute workout has a 6 week effect on body weight and composition. METHODS: The training group (n=29, age 18-30) did the 7-minute workout 7 days a week during 6 weeks while the control group (n=29) did not perform the workout...
January 13, 2017: Journal of Sports Medicine and Physical Fitness
https://www.readbyqxmd.com/read/28085121/maximalist-vs-minimalist-shoes-dose-effect-response-of-elastic-compression-on-muscular-oscillations
#15
Jules Gellaerts, Maxime Pirard, Jessie Muzic, Maxime Peseux, Arnaud Menetrier
BACKGROUND: To establish whether maximalist shoes engender fewer muscular oscillations than minimalist shoes and determine to what extent these shoes, when combined with elastic compression (EC), help reduce muscle oscillations. For that purpose, we tested the effects of various levels of compression on the muscular oscillations in maximalist and minimalist footwear. METHODS: 11 volunteers executed 16 one-minute passages on a flat treadmill in a randomized order: maximalists or minimalists, walking (6 km/h) or running (10 km/h), without EC (control condition - CON) or with EC applying different pressures (9...
January 13, 2017: Journal of Sports Medicine and Physical Fitness
https://www.readbyqxmd.com/read/28004904/children-and-adolescent-physical-activity-participation-and-enjoyment-during-active-play
#16
Asal Moghaddaszadeh, Yasamin Ahmadi, Angelo N Belcastro
BACKGROUND: Girls (9-19yrs) participation in physical activity (PA) is known to decrease at a faster rate than boys. A reduction in PA attractiveness (enjoyment) and lower psychosocial profile of girls approaching biological maturity may underlie the decreasing rate of PA participation. Since engaging children in active play programs improves health related quality of life indictors and enjoyment levels; the purposes of this study were to: a) assess psychosocial status and PA attractiveness/enjoyment of boys and girls to an eight-week active play program; and b) investigate the relationships among PA participation, psychosocial status and PA attractiveness with both age and maturity status for boys and girls following an active play PA program...
December 22, 2016: Journal of Sports Medicine and Physical Fitness
https://www.readbyqxmd.com/read/28004903/fluid-intake-behaviour-in-athletes-during-typical-training-bouts
#17
Alex Buoite Stella, Maria P Francescato, Stacy T Sims, Shawnda A Morrison
BACKGROUND: Hydration habits during training may differ depending on sports mode and individual characteristics. The aim of this study was to assess fluid intake behaviour in a wide sample of Italian athletes during their regular training. METHODS: Data on hydration habits during training were collected from a random sample of competitive athletes. Hydration strategies and personal characteristics were queried via questionnaire, including athletes' quantity and type of fluid ingested during a typical training bout, sport characteristics (e...
December 22, 2016: Journal of Sports Medicine and Physical Fitness
https://www.readbyqxmd.com/read/28004902/effectiveness-of-step-into-health-program-sih-in-qatar-a-pedometer-based-longitudinal-study
#18
Mohamed G Al-Kuwari, Abdulla S Al-Mohannadi, Suzan Sayegh
BACKGROUND: This study examines the impact of a one-year pedometer-based intervention on increasing the physical activity level among adult population in Qatar. METHODS: This longitudinal study was conducted over a one-year period and included a total of 268 adults aged between 18-64 years old. Data were extracted and used from the "Step into Health" (SIH) program, a community-based program launched in 2012, as an approach to improve physical activity in Qatar. Walking intervention encouraged members of SIH to accumulate 10,000 steps or more per day and monitor their progress through a pedometer supported by a self-monitoring online account and a reinforcement system...
December 22, 2016: Journal of Sports Medicine and Physical Fitness
https://www.readbyqxmd.com/read/28004901/a-study-on-level-of-physical-activity-depression-anxiety-and-stress-symptoms-among-adolescents
#19
Esra Tajik, Latiffah Abd Latiff, Siti N Adznam, Hamidin Awang, Chin Yit Siew, Azrin S Abu Bakar
BACKGROUND: Inadequate physical activity has adverse health consequences among adolescents. Mental health problem can be developed by lack of physical activity however it is controversial. The current study aimed to examine the association between level of physical activity with depression, anxiety and stress symptoms among adolescents. METHODS: A representative sample of 1,747 adolescents (13-14 years) was randomly selected from 6 schools in a south part of Malaysia...
December 22, 2016: Journal of Sports Medicine and Physical Fitness
https://www.readbyqxmd.com/read/27991485/construct-validity-of-tests-that-measure-kick-performance-for-young-soccer-players-based-on-cluster-analysis-exploring-the-relationship-between-coaches-rating-and-actual-measures
#20
Luiz H P Vieira, Vitor L DE Andrade, Rodrigo L Aquino, Renato Moraes, Fabio A Barbieri, Sérgio A Cunha, Bruno L Bedo, Paulo R Santiago
BACKGROUND: The main aim of this study was to verify the relationship between the classification of coaches and actual performance in field tests that measure the kicking performance in young soccer players, using the K--means clustering technique. METHODS: Twenty--three U--14 players performed eight tests to measure their kicking performance. Four experienced coaches provided a rating for each player as follows: 1--poor, 2--below average, 3--average, 4--very good, 5-excellent as related to three parameters (i...
December 16, 2016: Journal of Sports Medicine and Physical Fitness
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