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https://www.readbyqxmd.com/read/28210652/prevention-of-hamstring-injuries-in-collegiate-sprinters
#1
Yusaku Sugiura, Kazuhiko Sakuma, Keishoku Sakuraba, Yamato Sato
BACKGROUND: No studies have been reported on how strength, agility, and flexibility training reduce the occurrence of hamstring injuries in sprinters. Therefore, a program for preventing hamstring injury in these athletes has not been established. PURPOSE: To document the incidence of hamstring injuries during times when different prevention strategies were employed to see whether a particular prevention program reduced their occurrence. STUDY DESIGN: Descriptive epidemiology study...
January 2017: Orthopaedic Journal of Sports Medicine
https://www.readbyqxmd.com/read/28207966/relationship-between-the-length-of-the-forefoot-bones-and-performance-in-male-sprinters
#2
Takahiro Tanaka, Tadashi Suga, Mitsuo Ohtsuka, Jun Misaki, Yuto Miyake, Shoma Kudo, Akinori Nagano, Tadao Isaka
Although recent studies have reported that the forefoot bones are longer in sprinters than in non-sprinters, these reports included a relatively small number of subjects. Moreover, while computer simulation suggested that longer forefoot bones may contribute to higher sprint performance by enhancing plantar flexor moment during sprinting, the correlation between forefoot bone length and sprint performance in humans has not been confirmed in observational studies. Thus, using a relatively large sample, we compared the length of the forefoot bones between sprinters and non-sprinters...
February 16, 2017: Scandinavian Journal of Medicine & Science in Sports
https://www.readbyqxmd.com/read/28188370/the-knee-extensor-moment-arm-is-associated-with-performance-in-male-sprinters
#3
Yuto Miyake, Tadashi Suga, Mitsuo Otsuka, Takahiro Tanaka, Jun Misaki, Shoma Kudo, Akinori Nagano, Tadao Isaka
PURPOSE: Although large knee extensor torque contributes to superior sprint performance, previous findings have indicated that the quadriceps cross-sectional area (CSA), a pivotal morphological regulator of knee extensor torque, is not correlated with performance in sprinters. We hypothesized that the knee extensor moment arm (MA), another main morphological regulator of knee extensor torque, may affect sprint performance. To test this hypothesis, we examined the relationship between knee extensor MA and sprint performance...
February 10, 2017: European Journal of Applied Physiology
https://www.readbyqxmd.com/read/28182969/experience-level-influences-the-effect-of-attentional-focus-on-sprint-performance
#4
Nicklaas C Winkelman, Kenneth P Clark, Larry J Ryan
Two experiments evaluated the influence of attentional focus on 10-meter sprint time and start kinetics in a group of collegiate soccer players and highly experienced sprinters. In Experiment 1, the collegiate soccer players were asked to perform 10-meter sprints under an external focus condition, an internal focus condition and a control condition. For the 10-meter sprint time, the results showed that both the external focus and control conditions resulted in significantly faster sprint times than the internal focus condition...
February 6, 2017: Human Movement Science
https://www.readbyqxmd.com/read/28149523/differences-in-life-expectancy-between-olympic-high-jumpers-discus-throwers-marathon-and-100-meter-runners
#5
Jeffrey Lee-Heidenreich, David Lee-Heidenreich, Jonathan Myers
BACKGROUND: Several studies have demonstrated that body habitus is associated with survival (life expectancy) time. We sought to determine if survival differed between elite athletes with a range of body types. We hypothesized that the survival would differ between athlete types and that ectomorph athletes would have longer survival than heavier athletes. METHODS: For each Olympics between 1928 and 1948 we identified the top (up to 20) Olympic male and female finishers in the high jump (HJ), discus throw, marathon, and 100-m run...
2017: BMC Sports Science, Medicine and Rehabilitation
https://www.readbyqxmd.com/read/28127562/declining-physical-performance-associates-with-serum-fasl-mir-21-and-mir-146a-in-aging-sprinters
#6
Reeta Kangas, Timo Törmäkangas, Ari Heinonen, Markku Alen, Harri Suominen, Vuokko Kovanen, Eija K Laakkonen, Marko T Korhonen
Aging is associated with systemic inflammation and cellular apoptosis accelerating physiological dysfunctions. Whether physically active way of life affects these associations is unclear. This study measured the levels of serum inflammatory and apoptotic molecules, their change over 10 years, and their associations with physical performance in sprint-trained male athletes. HsCRP, cell counts, HGB, FasL, miR-21, and miR-146a were measured cross-sectionally (n = 67, 18-90 yrs) and serum FasL, miR-21, and miR-146a and their aging-related associations with physical performance were assessed over a 10-year follow-up (n = 49, 50-90 yrs)...
2017: BioMed Research International
https://www.readbyqxmd.com/read/28111069/mechanical-characterization-and-comparison-of-energy-storage-and-return-prostheses
#7
Stacey M Rigney, Anne Simmons, Lauren Kark
The suitability of finite element analysis (FEA) for standardizing the mechanical characterization of energy storage and return (ESAR) prostheses was investigated. A methodology consisting of both experimental and numerical analysis was proposed and trialed for the Vari-flex(®) Modular(TM), Flex-foot Cheetah and Cheetah Xtreme by Össur(®) and a 1E90 Sprinter by Ottobock(®). Gait analysis was conducted to determine suitable orientation angles for non-destructive testing (NDT) of the ESAR prostheses followed by a quasi-static inverse FEA procedure within COMSOL Multiphysics(®), where the NDT conditions were replicated to determine the homogenized material properties of the prostheses...
January 20, 2017: Medical Engineering & Physics
https://www.readbyqxmd.com/read/28104752/reduced-prosthetic-stiffness-lowers-the-metabolic-cost-of-running-for-athletes-with-bilateral-transtibial-amputations
#8
Owen N Beck, Paolo Taboga, Alena Marie Grabowski
Inspired by the spring-like action of biological legs, running-specific prostheses are designed to enable athletes with lower-limb amputations to run. Yet, manufacturer recommendations for prosthetic stiffness and height may not optimize running performance. Therefore, we investigated the effects of using different prosthetic configurations on the metabolic cost and biomechanics of running. Five athletes with bilateral transtibial amputations each performed fifteen trials on a force-measuring treadmill at 2...
January 19, 2017: Journal of Applied Physiology
https://www.readbyqxmd.com/read/28094681/relationship-between-body-height-and-spatiotemporal-parameters-during-a-100-m-sprint-in-able-bodied-and-unilateral-transtibial-sprinters
#9
Hiroaki Hobara, Wolfgang Potthast, Ralf Müller, Yoshiyuki Kobayashi, Satoru Hashizume, Thijs A Herdoorn, Masaaki Mochimaru
BACKGROUND: Although anthropometric factors could influence sprint performance in able-bodied sprinters, little is known about the relationships between these anthropometric factors and sprint performance in amputee sprinters. OBJECTIVES: To investigate the relationships between body height and spatiotemporal parameters of 100-m sprints in unilateral transtibial amputee and able-bodied sprinters. STUDY DESIGN: This is a cross-sectional study...
January 1, 2017: Prosthetics and Orthotics International
https://www.readbyqxmd.com/read/28051333/optimal-loading-for-maximising-power-during-sled-resisted-sprinting
#10
Matt R Cross, Matt Brughelli, Pierre Samozino, Scott R Brown, Jean-Benoit Morin
Purpose We sought to ascertain whether force-velocity-power relationships could be compiled from a battery of sled-resisted over-ground sprints, and to clarify and compare the optimal loading conditions for maximising power production for different athlete cohorts. Methods Recreational mixed-sport athletes (n=12) and sprinters (n=15) performed multiple trials of maximal sprints unloaded and towing a selection of sled masses (20-120% body-mass). Velocity data were collected by sports radar, and kinetics at peak velocity were quantified using friction coefficients and aerodynamic drag...
January 4, 2017: International Journal of Sports Physiology and Performance
https://www.readbyqxmd.com/read/28040320/semimembranosus-tenosynovitis-diagnosis-and-management-of-a-commonly-missed-cause-of-posteromedial-knee-pain
#11
Joel K Melton, Arman Memarzadeh, William H Dunbar, Mervyn J Cross
BACKGROUND: In orthopedic and sports medicine literature there is minimal information regarding accurate diagnosis and the treatment options for tenosynovitis of the distal semimembranosus tendon. After reviewing the literature, the authors question both the etiology and treatment of this condition. Previous descriptions have associated the condition primarily with the endurance athlete but we have noted multiple cases in which this is a condition common to the 'sprinter' as well. There has been very little mention of this condition in recent literature but the most recent complete description of operative treatment for this condition recommends both tendon transfer and concomitant arthroscopy...
December 28, 2016: Knee
https://www.readbyqxmd.com/read/27967284/sled-towing-the-optimal-overload-for-peak-power-production
#12
Andrea Monte, Francesca Nardello, Paola Zamparo
PURPOSE: The effects of different loads on kinematic and kinetic variables during sled towing were investigated with the aim to identify the optimal overload for this specific sprint training. METHODS: Thirteen male sprinters (100m PB: 10.91±0.14 s) performed 5 maximal trials over a 20m distance in the following conditions: unloaded (UL) and with loads from +15% to +40% of the athlete's body mass (BM). In these calculations the sled mass and friction were taken into account...
December 14, 2016: International Journal of Sports Physiology and Performance
https://www.readbyqxmd.com/read/27940620/how-to-build-a-deep-diver-the-extreme-morphology-of-mesoplodonts
#13
D Ann Pabst, William A McLellan, Sentiel A Rommel
Mesoplodont beaked whales are extreme divers, diving for over 45 mins and to depths of over 800 m. These dives are of similar depth and duration to those of the giant sperm whale (Physeter macrocephalus) whose body mass can be 50 times larger. Velten et al. (2013) provided anatomical data that demonstrated that on-board oxygen stores were sufficient to aerobically support the extreme dives of mesoplodonts if their diving metabolic rates are low. Because no physiological data yet exist, we utilized an anatomical approach-the body composition technique-to examine the relative metabolic rates of mesoplodonts...
December 2016: Integrative and Comparative Biology
https://www.readbyqxmd.com/read/27916891/comparison-of-site-specific-bone-mineral-densities-between-endurance-runners-and-sprinters-in-adolescent-women
#14
Aoi Ikedo, Aya Ishibashi, Saori Matsumiya, Aya Kaizaki, Kumiko Ebi, Satoshi Fujita
We aimed to compare site-specific bone mineral densities (BMDs) between adolescent endurance runners and sprinters and examine the relationship of fat-free mass (FFM) and nutrient intake on BMD. In this cross-sectional study, 37 adolescent female endurance runners and sprinters (16.1 ± 0.8 years) were recruited. BMD and FFM were assessed by dual-energy X-ray absorptiometry. Nutrient intake and menstrual state were evaluated by questionnaires. After adjusting for covariates, spine and total bone less head (TBLH) BMDs were significantly higher in sprinters than endurance runners (TBLH, 1...
November 30, 2016: Nutrients
https://www.readbyqxmd.com/read/27905858/seasonal-effects-on-body-composition-muscle-characteristics-and-performance-of-collegiate-swimmers-and-divers
#15
Erica J Roelofs, Abbie E Smith-Ryan, Eric T Trexler, Katie R Hirsch
CONTEXT:  Previous researchers have indicated the importance of body composition and muscle quality in athletic performance. However, body composition and muscle-quality measures in swimmers and divers over a training season have yet to be evaluated. OBJECTIVE:  To identify changes in body composition and muscle characteristics over a competitive season and identify relationships between these variables and performance in National Collegiate Athletic Association Division I swimmers and divers...
January 2017: Journal of Athletic Training
https://www.readbyqxmd.com/read/27874306/power-and-speed-differences-between-brazilian-paralympic-sprinters-with-visual-impairment-and-their-guides
#16
Lucas Pereira, Ciro Winckler, Cesar C Cal Abad, Ronaldo Kobal, Katia Kitamura, Amaury Veríssimo, Fabio Y Nakamura, Irineu Loturco
This study compared the physical performance of Paralympic sprinters with visual impairments (PSVI) and their guides in jump and sprint tests. Ten PSVI and guides executed squat jumps (SJ), countermovement jumps (CMJ), horizontal quintuple right/left-leg jumps (QR/QL), decuple jumps (DEC), and 50-m-sprint tests. The guides were superior to the PSVI in SJ (35.9 ± 6.3 vs 45.6 ± 3.2 cm), CMJ (38.5 ± 6.2 vs 46.7 ± 4.0 cm), QR (9.2 ± 1.9 vs 12.7 ± 1.0 m), QL (9.4 ± 1.9 vs 13.1 ± 0.8 m), DEC (21.0 ± 3.3 vs...
October 2016: Adapted Physical Activity Quarterly: APAQ
https://www.readbyqxmd.com/read/27846785/the-three-dimensional-kinetic-behaviour-of-the-pelvic-rotation-in-maximal-sprint-running
#17
Natsuki Sado, Shinsuke Yoshioka, Senshi Fukashiro
The purpose of this study was to investigate the effect of lumbosacral kinetics on sprinting. Twelve male sprinters performed 50 m sprints at maximal effort. Kinematic and ground reaction force data were recorded at approximately 40 m from sprint commencement. A whole-body inverse dynamics approach was applied to calculate joint forces and torques at the hip and lumbosacral joints. The contribution of the hips and lumbosacral joint torques to pelvic rotation was subsequently calculated, with joint force powers indicating the rate of mechanical energy transfer between segments across joint centres calculated for both hip joints...
November 15, 2016: Sports Biomechanics
https://www.readbyqxmd.com/read/27846241/sprint-start-kinetics-of-amputee-and-non-amputee-sprinters
#18
Steffen Willwacher, Volker Herrmann, Kai Heinrich, Johannes Funken, Gerda Strutzenberger, Jan-Peter Goldmann, Björn Braunstein, Adam Brazil, Gareth Irwin, Wolfgang Potthast, Gert-Peter Brüggemann
The purpose of this study was to explore the relationship between the forces applied to the starting blocks and the start performances (SPs) of amputee sprinters (ASs) and non-amputee sprinters (NASs). SPs of 154 male and female NASs (100-m personal records [PRs], 9.58-14.00 s) and 7 male ASs (3 unilateral above knee, 3 unilateral below knee, 1 bilateral below knee; 100 m PRs, 11.70-12.70 s) with running specific prostheses (RSPs) were analysed during full-effort sprint starts using instrumented starting blocks that measured the applied forces in 3D...
2016: PloS One
https://www.readbyqxmd.com/read/27806673/sprint-performance-and-mechanical-outputs-computed-with-an-iphone-app-comparison-with-existing-reference-methods
#19
Natalia Romero-Franco, Pedro Jiménez-Reyes, Adrián Castaño-Zambudio, Fernando Capelo-Ramírez, Juan José Rodríguez-Juan, Jorge González-Hernández, Francisco Javier Toscano-Bendala, Víctor Cuadrado-Peñafiel, Carlos Balsalobre-Fernández
The purpose of this study was to assess validity and reliability of sprint performance outcomes measured with an iPhone application (named: MySprint) and existing field methods (i.e. timing photocells and radar gun). To do this, 12 highly trained male sprinters performed 6 maximal 40-m sprints during a single session which were simultaneously timed using 7 pairs of timing photocells, a radar gun and a newly developed iPhone app based on high-speed video recording. Several split times as well as mechanical outputs computed from the model proposed by Samozino et al...
November 3, 2016: European Journal of Sport Science
https://www.readbyqxmd.com/read/27701443/spatiotemporal-parameters-of-100-m-sprint-in-different-levels-of-sprinters-with-unilateral-transtibial-amputation
#20
Hiroaki Hobara, Satoru Hashizume, Yoshiyuki Kobayashi, Masaaki Mochmaru
The aim of this study was to investigate differences of the spatiotemporal parameters in a 100-m sprint among elite, sub-elite, and non-elite sprinters with a unilateral transtibial amputation. Using publicly available Internet broadcasts, we analyzed 125, 19, and 33 records from 30 elite, 12 sub-elite, and 22 non-elite sprinters, respectively. For each sprinter's run, the average velocity, step frequency, and step length were calculated using the number of steps in conjunction with the official race time. Average velocity was greatest in elite sprinters (8...
2016: PloS One
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