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https://www.readbyqxmd.com/read/29334580/the-power-load-relationship-during-a-countermovement-jump-a-joint-level-analysis
#1
Kym J Williams, Dale W Chapman, Elissa J Phillips, Nick Ball
This study aimed to investigate if hip, knee and ankle peak power is influenced by the relative load lifted, altering the joint and system load-power relationship during a countermovement jump (CMJ). Twenty-Three male national representative athletes (age: 20.3 ± 3.1y, squat 1RM: 133.8 ± 24.8kg) completed three CMJs at relative barbell loads of 0, 10, 20, 30 and 40% of an athlete's estimated back squat 1RM. Ground reaction force and joint kinematics were captured using a 16 camera motion capture array integrated with two in ground tri-axial force plates...
January 12, 2018: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/29334572/assessment-of-parasympathetic-activity-in-athletes-comparing-two-different-methods-retraction
#2
(no author information available yet)
No abstract text is available yet for this article.
February 2018: Medicine and Science in Sports and Exercise
https://www.readbyqxmd.com/read/29334538/sickle-cell-trait-testing-should-not-be-a-player-in-ncaa-athletics-examining-the-media-s-role-in-disseminating-awareness-and-information
#3
Anil P George, Antonio Logan, Mindy Simpson, Paul M Kent
No abstract text is available yet for this article.
January 12, 2018: Journal of Pediatric Hematology/oncology
https://www.readbyqxmd.com/read/29334328/different-durations-within-the-method-of-best-practice-affect-the-parameters-of-the-speed-duration-relationship
#4
Christoph Triska, Bettina Karsten, Chris Beedie, Bernhard Koller-Zeisler, Alfred Nimmerichter, Harald Tschan
The aim of the study was to determine whether estimates of the speed-duration relationship are affected using different time-trial (TT) field-based testing protocols, where exhaustive times were located within the generally recommended durations of 2-15 min. Ten triathletes (mean ± SD age: 31.0 ± 5.7 years; height: 1.81 ± 0.05 m; body mass: 76.5 ± 6.8 kg) performed two randomly assigned field tests to determine critical speed (CS) and the total distance covered above CS (D´). CS and D´ were obtained using two different protocols comprising three TT that were interspersed by 60 min passive rest...
January 15, 2018: European Journal of Sport Science
https://www.readbyqxmd.com/read/29334325/concurrent-validity-and-reliability-of-torso-worn-inertial-measurement-unit-for-jump-power-and-height-estimation
#5
Timo Rantalainen, Paul B Gastin, Rhys Spangler, Daniel Wundersitz
The purpose of the present study was to evaluate the concurrent validity and test-retest repeatability of torso-worn IMU-derived power and jump height in a counter-movement jump test. Twenty-seven healthy recreationally active males (age, 21.9 [SD 2.0] y, height, 1.76 [0.7] m, mass, 73.7 [10.3] kg) wore an IMU and completed three counter-movement jumps a week apart. A force platform and a 3D motion analysis system were used to concurrently measure the jumps and subsequently derive power and jump height (based on take-off velocity and flight time)...
January 15, 2018: Journal of Sports Sciences
https://www.readbyqxmd.com/read/29334309/effects-of-resisted-sprint-training-on-sprinting-ability-and-change-of-direction-speed-in-professional-soccer-players
#6
Saulo Gil, Renato Barroso, Everton Crivoi do Carmo, Irineu Loturco, Ronaldo Kobal, Valmor Tricoli, Carlos Ugrinowitsch, Hamilton Roschel
Resisted sprint training consists of performing overloaded sprints, which may produce greater effects than traditional sprint training. We compared a resisted sprint training with overload control versus an unresisted sprint training program on performance in soccer players. Eighteen elite athletes were randomly assigned to resisted (RST) or unresisted sprint training protocol (UR). Before and after a 6-week training period, sprinting ability, change of direction speed (COD), vertical jumps (SJ and CMJ), mean power (MP) and mean propulsive power (MPP) at distinct loads were assessed...
January 15, 2018: Journal of Sports Sciences
https://www.readbyqxmd.com/read/29333727/the-relation-between-maximal-voluntary-force-in-m-palmaris-longus-and-the-temporal-and-spatial-summation-of-muscle-fiber-recruitment-in-human-subjects
#7
Cécyl G Claudel, Waqas Ahmed, Vibeke S Elbrønd, Adrian P Harrison, Else Marie Bartels
This study aimed at looking at the frequency (T-score) and the amplitude (S-score) of fiber use during contraction of a forearm muscle, m. palmaris longus, as measured by acoustic myography (AMG). An additional aim was to relate the T- and S-scores to the recorded force obtained from a hand dynamometer. The hypothesis being that temporal and spatial summation of muscle fiber contraction in a given muscle during a given movement, can together describe a given obtained force. Force measurements were carried out on 12 healthy human subjects aged 19-68 years (6 men & 6 women), while their m...
January 2018: Physiological Reports
https://www.readbyqxmd.com/read/29332665/performance-outcomes-after-medial-ulnar-collateral-ligament-reconstruction-in-major-league-baseball-positional-players
#8
John P Begly, Michael S Guss, Theodore S Wolfson, Siddharth A Mahure, Andrew S Rokito, Laith M Jazrawi
BACKGROUND: We sought to determine whether professional baseball positional players who underwent medial ulnar collateral ligament (MUCL) reconstruction demonstrate decreases in performance on return to competition compared with preoperative performance metrics and their control-matched peers. METHODS: Data for 35 Major League Baseball positional players who underwent MUCL reconstruction during 31 seasons were obtained. Twenty-six players met inclusion criteria...
February 2018: Journal of Shoulder and Elbow Surgery
https://www.readbyqxmd.com/read/29332472/statistical-primer-for-athletic-trainers-the-essentials-of-understanding-measures-of-reliability-and-minimal-important-change
#9
Bryan L Riemann, Monica Lininger
OBJECTIVE:   To describe the concepts of measurement reliability and minimal important change. BACKGROUND:   All measurements have some magnitude of error. Because clinical practice involves measurement, clinicians need to understand measurement reliability. The reliability of an instrument is integral in determining if a change in patient status is meaningful. DESCRIPTION:   Measurement reliability is the extent to which a test result is consistent and free of error...
January 13, 2018: Journal of Athletic Training
https://www.readbyqxmd.com/read/29332471/fatal-exertional-heat-stroke-and-american-football-players-the-need-for-regional-heat-safety-guidelines
#10
Andrew J Grundstein, Yuri Hosokawa, Douglas J Casa
CONTEXT:   Weather-based activity modification in athletics is an important way to minimize heat illnesses. However, many commonly used heat-safety guidelines include a uniform set of heat-stress thresholds that do not account for geographic differences in acclimatization. OBJECTIVE:   To determine if heat-related fatalities among American football players occurred on days with unusually stressful weather conditions based on the local climate and to assess the need for regional heat-safety guidelines...
January 13, 2018: Journal of Athletic Training
https://www.readbyqxmd.com/read/29332470/a-school-based-neuromuscular-training-program-and-sport-related-injury-incidence-a-prospective-randomized-controlled-clinical-trial
#11
Kim D Barber Foss, Staci Thomas, Jane C Khoury, Gregory D Myer, Timothy E Hewett
CONTEXT:   An estimated 40 million school-aged children (age range = 5-18 years) participate annually in sports in the United States, generating approximately 4 million sport-related injuries and requiring 2.6 million emergency department visits at a cost of nearly $2 billion. OBJECTIVE:   To determine the effects of a school-based neuromuscular training (NMT) program on sport-related injury incidence across 3 sports at the high school and middle school levels, focusing particularly on knee and ankle injuries...
January 13, 2018: Journal of Athletic Training
https://www.readbyqxmd.com/read/29332469/balance-regularity-among-former-high-school-football-players-with-or-without-a-history-of-concussion
#12
Julianne D Schmidt, Douglas P Terry, Jihyun Ko, Karl M Newell, L Stephen Miller
CONTEXT:   Subclinical postural-control changes may persist beyond the point when athletes are considered clinically recovered postconcussion. OBJECTIVE:   To compare postural-control performance between former high school football players with or without a history of concussion using linear and nonlinear metrics. DESIGN:   Case-control study. SETTING:   Clinical research laboratory. PATIENTS OR OTHER PARTICIPANTS:   A total of 11 former high school football players (age range, 45-60 years) with 2 or more concussions and 11 age- and height-matched former high school football players without a history of concussion...
January 13, 2018: Journal of Athletic Training
https://www.readbyqxmd.com/read/29332225/over-90%C3%A2-of-children-and-adolescents-return-to-sport-after-anterior-cruciate-ligament-reconstruction-a-systematic-review-and-meta-analysis
#13
REVIEW
Jeffrey Kay, Muzammil Memon, Robert G Marx, Devin Peterson, Nicole Simunovic, Olufemi R Ayeni
PURPOSE: To evaluate the rate at which children and adolescent athletes return to sporting activities after anterior cruciate ligament (ACL) reconstruction. METHODS: Three databases, PubMed, MEDLINE, and EMBASE, were searched from database inception until September 9, 2017 by two reviewers independently and in duplicate. The inclusion criteria were English language studies that reported return to sport outcomes. Book chapters, conference papers, review articles, and technical reports were excluded...
January 13, 2018: Knee Surgery, Sports Traumatology, Arthroscopy: Official Journal of the ESSKA
https://www.readbyqxmd.com/read/29332181/management-of-rotator-cuff-injuries-in-the-elite-athlete
#14
REVIEW
Leigh J Weiss, Dean Wang, Michael Hendel, Philip Buzzerio, Scott A Rodeo
PURPOSE OF REVIEW: Rotator cuff injuries are a common cause of pain and dysfunction for the elite athlete and can result in time loss from participation. This review highlights the current management of these injuries. RECENT FINDINGS: Conservative management of rotator cuff injuries continues to be the "gold standard" in the elite athlete. This includes a comprehensive rehabilitation program, anti-inflammatories, and corticosteroid injections. Newer treatment techniques such as intramuscular dry needling and the use of biologics such as platelet-rich plasma and stem cells demonstrate early promising results; however, these modalities require further investigation to determine their effectiveness...
January 13, 2018: Current Reviews in Musculoskeletal Medicine
https://www.readbyqxmd.com/read/29331050/exercise-counteracts-lipotoxicity-by-improving-lipid-turnover-and-lipid-droplet-quality
#15
Evelyn Zacharewicz, Matthijs K C Hesselink, Patrick Schrauwen
The incidence of obesity and metabolic disease, such as type 2 diabetes mellitus (T2D), are rising globally. Dietary lipid over-supply leads to lipid accumulation at ectopic sites, such as skeletal muscle. Ectopic lipid storage is highly correlated with insulin resistance and T2D, likely due to a loss of metabolic flexibility - the capacity to switch between fat and glucose oxidation upon insulin stimulation - and cellular dysfunction because of lipotoxicity. However, muscle lipid levels are also elevated in endurance trained athletes, presenting a paradoxical phenotype of increased intramuscular lipids along with high insulin sensitivity - the "athletes' paradox"...
January 13, 2018: Journal of Internal Medicine
https://www.readbyqxmd.com/read/29330780/safety-in-mixed-martial-arts-a-7-year-review-of-cancelled-mma-bouts-in-calgary-alberta-during-the-pre-bout-medical-examination-period
#16
Gwynn Curran-Sills
BACKGROUND: Presently, there is no literature that examines the reasons for the cancellation of amateur or professional mixed martial arts (MMA) bouts. The purpose of this study was to review the circumstances that lead to the cancellation of MMA bouts by Calgary ringside physicians during the pre-bout examination period and to identify any emerging patterns that may guide the regulatoin of this sport. METHODS: The case-series  was constructed from the Calgary Combative Sports Commission pre-bout examination records and the medical records submitted by each athlete from January 2010 to December 2016...
January 12, 2018: Sports Medicine—Open
https://www.readbyqxmd.com/read/29330738/a-video-review-of-multiple-concussion-signs-in-national-rugby-league-match-play
#17
Andrew J Gardner, David R Howell, Grant L Iverson
BACKGROUND: Video review has been introduced in many professional sports worldwide to help recognize concussions. However, to date, there has been very little research on the accuracy of using video analysis to identify signs of concussion and the various combinations of observed signs. METHODS: The objective of the study is to determine the accuracy of combinations of clinical signs of concussion identified using video analysis to identify concussions in the National Rugby League (NRL)...
January 12, 2018: Sports Medicine—Open
https://www.readbyqxmd.com/read/29330670/treatment-of-partial-thickness-rotator-cuff-tears-in-overhead-athletes
#18
REVIEW
Joseph N Liu, Grant H Garcia, Anirudh K Gowd, Brandon C Cabarcas, Michael D Charles, Anthony A Romeo, Nikhil N Verma
PURPOSE OF REVIEW: To review the etiology, classification, presentation, evaluation, treatment strategy, and outcomes in overhead athletes with partial thickness rotator cuff tears. RECENT FINDINGS: Despite advances in surgical repair techniques, return to play following surgical repair of partial rotator cuff tears remains modest at best. Overhead athletes may be particularly prone to rotator cuff pathology due to the supraphysiological strains within the tendon during the throwing motion, as well as mechanical stress with contact between the undersurface of the rotator cuff and the glenoid...
January 13, 2018: Current Reviews in Musculoskeletal Medicine
https://www.readbyqxmd.com/read/29329889/exploring-individual-adaptations-to-an-anterior-cruciate-ligament-injury-prevention-programme
#19
Aaron S Fox, Jason Bonacci, Scott G McLean, Natalie Saunders
BACKGROUND: Individual responses to anterior cruciate ligament injury prevention programmes (ACL IPPs) have received little attention. This study examined the effects of an ACL IPP on neuromuscular control and lower limb biomechanics during landing at the group and individual levels. METHODS: Sixteen female athletes were randomly allocated to training (n=8) or control (n=8) groups. Electromyography, and three-dimensional kinematic and kinetic data were collected during landing at two testing sessions...
January 9, 2018: Knee
https://www.readbyqxmd.com/read/29329116/concussion-symptom-underreporting-among-incoming-national-collegiate-athletic-association-division-i-college-athletes
#20
Fiona N Conway, Marianne Domingues, Robert Monaco, Laura M Lesnewich, Anne E Ray, Brandon L Alderman, Sabrina M Todaro, Jennifer F Buckman
OBJECTIVE: Accurate diagnosis of sport-related concussions relies heavily on truthful self-reporting of symptom severity. Previous studies have emphasized lack of knowledge as a factor in symptom nondisclosure. This study sought to examine concussion knowledge and the relationship of knowledge to reasons for symptom nondisclosure. DESIGN: Cross-sectional study. SETTING: Data were collected during preparticipation athletic evaluations via electronic survey...
January 11, 2018: Clinical Journal of Sport Medicine: Official Journal of the Canadian Academy of Sport Medicine
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