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https://www.readbyqxmd.com/read/28823037/female-sex-is-associated-with-greater-rotatory-knee-laxity-in-collegiate-athletes
#1
Thomas R Pfeiffer, Ajay C Kanakamedala, Elmar Herbst, Kanto Nagai, Conor Murphy, Jeremy M Burnham, Adam Popchak, Richard E Debski, Volker Musahl
PURPOSE/HYPOTHESIS: The purpose of this observational study was to determine which factors, including sex, are associated with increased rotatory knee laxity in collegiate athletes with no history of knee injuries. It was hypothesized that increased rotatory knee laxity, measured by a quantitative pivot shift test, would correlate with female sex, increased anterior translation during the Lachman test, generalized ligamentous laxity, and knee hyperextension. METHODS: Ninety-eight collegiate athletes with a median age of 20 (range 18-25) years with no history of knee injuries were tested...
August 19, 2017: Knee Surgery, Sports Traumatology, Arthroscopy: Official Journal of the ESSKA
https://www.readbyqxmd.com/read/28822690/microrna29a-treatment-improves-early-tendon-injury
#2
Ashlee E Watts, Neal L Millar, Josh Platt, Susan M Kitson, Moeed Akbar, Raquel Rech, Jay Griffin, Roy Pool, Tom Hughes, Iain B McInnes, Derek S Gilchrist
Tendon injuries (tendinopathies) are common in human and equine athletes and characterized by dysregulated collagen matrix, resulting in tendon damage. We have previously demonstrated a functional role for microRNA29a (miR29a) as a post-transcriptional regulator of collagen 3 expression in murine and human tendon injury. Given the translational potential, we designed a randomized, blinded trial to evaluate the potential of a miR29a replacement therapy as a therapeutic option to treat tendinopathy in an equine model that closely mimics human disease...
July 28, 2017: Molecular Therapy: the Journal of the American Society of Gene Therapy
https://www.readbyqxmd.com/read/28822267/a-similar-pro-anti-inflammatory-cytokine-balance-is-present-in-the-airways-of-competitive-athletes-and-non-exercising-asthmatics
#3
Marcin Kurowski, Janusz Jurczyk, Agnieszka Olszewska-Ziąber, Marzanna Jarzębska, Hubert Krysztofiak, Marek L Kowalski
PURPOSE: Intensive exercise modifies airway inflammation and infection susceptibility. We aimed to determine the effect of exercise on pro- and anti-inflammatory cytokine (TNF-α, IL-1ra, IL-10) and innate immunity protein (HSPA1, sCD14) levels in exhaled breath condensate (EBC) and nasal secretions of competitive athletes, non-exercising asthmatics and healthy controls (HC). MATERIAL AND METHODS: The study group consisted of 15 competitive athletes (five speed skaters and ten swimmers) aged 15-25...
August 16, 2017: Advances in Medical Sciences
https://www.readbyqxmd.com/read/28821541/targeting-mir-423-5p-reverses-exercise-training-induced-hcn4-channel-remodeling-and-sinus-bradycardia
#4
Alicia D'Souza, Charles M Pearman, Yanwen Wang, Shu Nakao, Sunil Jit R Logantha, Charlotte Cox, Hayley J Bennett, Yu Zhang, Anne Berit Johnsen, Nora Linscheid, Pi C Poulsen, Jonathan Elliott, Jessica Coulson, Jamie S McPhee, Abigail C Robertson, Paula A da Costa Martins, Ashraf Kitmitto, Ulrik Wisloff, Elizabeth J Cartwright, Oliver Monfredi, Alicia Lundby, Halina Dobrzynski, Delvac Oceandy, Gwilym M Morris, Mark R Boyett
Rationale: Downregulation of the pacemaking ion channel, HCN4, and the corresponding ionic current, If, underlies exercise training-induced sinus bradycardia in rodents. If this occurs in humans, it could explain the increased incidence of bradyarrhythmias in veteran athletes and it will be important to understand the underlying processes. Objective: To test the role of HCN4 in the training-induced bradycardia in human athletes and investigate the role of micro-RNAs (miRs) in the repression of HCN4. Methods and Results: As in rodents, the intrinsic heart rate was significantly lower in human athletes than non-athletes and in all subjects the rate-lowering effect of the HCN selective blocker, ivabradine, was significantly correlated with the intrinsic heart rate, consistent with HCN repression in athletes...
August 17, 2017: Circulation Research
https://www.readbyqxmd.com/read/28821469/a-cluster-randomized-trial-of-a-middle-school-gender-violence-prevention-program-design-rationale-and-sample-characteristics
#5
Kaleab Z Abebe, Kelley A Jones, Samantha Ciaravino, Lisa Ripper, Taylor Paglisotti, Sarah Elizabeth Morrow, Melanie Grafals, Courtney Van Dusen, Elizabeth Miller
INTRODUCTION: High rates of adolescent relationship abuse (ARA) and sexual violence (SV) reported among adolescents point to the need for prevention among middle school-age youth. This is a cluster randomized controlled trial to test an athletic coach-delivered ARA/SV prevention program in 41 middle schools (38 clusters). Trained coaches talk to their male athletes about 1) what constitutes harmful vs. respectful relationship behaviors, 2) dispelling myths that glorify male sexual aggression and promoting more gender-equitable attitudes, and 3) positive bystander intervention when aggressive male behaviors toward females are witnessed...
August 15, 2017: Contemporary Clinical Trials
https://www.readbyqxmd.com/read/28821447/time-perception-pacing-and-exercise-intensity-maximal-exercise-distorts-the-perception-of-time
#6
A M Edwards, A McCormick
INTRODUCTION: Currently there are no data examining the impact of exercise on the perception of time which is surprising as optimal competitive performance is dependent on accurate pacing using knowledge of time elapsed. METHODS: With institutional ethics approval, 12 recreationally active adult participants (f=7, m=5) undertook both 30s Wingate cycles and 20min (1200s) rowing ergometer bouts as short and long duration self-paced exercise trials, in each of three conditions on separate occasions: 1) light exertion: RPE 11, 2) heavy exertion: RPE 15, 3) maximal exertion: RPE 20...
August 15, 2017: Physiology & Behavior
https://www.readbyqxmd.com/read/28821254/seasonal-fluctuations-in-body-weight-during-growth-of-thoroughbred-racehorses-during-their-athletic-career
#7
Yuji Takahashi, Toshiyuki Takahashi
BACKGROUND: Domesticated horses adapt to environmental conditions through seasonal fluctuations in their metabolic rate. The seasonal change of metabolic rates of domesticated horses in pastures is documented. However, there are few investigations on seasonal body weight change of domesticated horses housed in stables, which are provided constant energy intake throughout the year. Both seasonal changes and gain in body weight of racehorses during their athletic career is known to a lesser extent because their body weight are not measured in most countries...
August 18, 2017: BMC Veterinary Research
https://www.readbyqxmd.com/read/28820856/perceived-wellness-associated-with-practice-and-competition-in-ncaa-division-i-football-players
#8
Aaron D Wellman, Sam C Coad, Patrick J Flynn, Ty K Siam, Christopher P McLellan
The present study assessed the influence of movement demands resulting from weekly practice sessions and games, on perceived wellness measurements taken post-game (Sunday) and 48 hours pre-game (Thursday) throughout the in-season period in National Collegiate Athletic Association (NCAA) division I football players. Thirty players were monitored using GPS receivers (Catapult Innovations OptimEye S5, Melbourne, Australia) during 12 games and 24 in-season practices. Movement variables included low-intensity distance, medium-intensity distance, high-intensity distance, sprint distance, total distance, player load, and acceleration and deceleration distance...
August 15, 2017: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/28820854/a-brief-review-of-handgrip-strength-and-sport-performance
#9
John Cronin, Trent Lawton, Nigel Harris, Andrew Kilding, Daniel Travis McMaster
Tests of handgrip strength (HGS) and handgrip force (HGF) are commonly used across a number of sporting populations. Measures of HGS and HGF have also been utilized by practitioners and researchers to evaluate links with sports performance. This article, firstly evaluates the validity and reliability of various handgrip dynamometers (HGD) and HGF sensors, providing recommendations for procedures to ensure precise and reliable data are collected as part of an athlete testing battery. Secondly, the differences in HGS between elite and sub-elite athletes and the relationships between HGS, HGF, and sports performance are discussed...
August 15, 2017: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/28820271/cam-deformities-and-limited-hip-range-of-motion-are-associated-with-early-osteoarthritic-changes-in-adolescent-athletes-a-prospective-matched-cohort-study
#10
Cody C Wyles, Germán A Norambuena, Benjamin M Howe, Dirk R Larson, Bruce A Levy, Brandon J Yuan, Robert T Trousdale, Rafael J Sierra
BACKGROUND: The natural history of femoroacetabular impingement (FAI) remains incompletely understood. In particular, there is limited documentation of joint damage in adolescent patients with limited range of motion (LROM) of the hip, which is commonly associated with FAI. PURPOSE: To evaluate changes in magnetic resonance imaging (MRI), radiographs, and clinical examinations over 5 years in a group of athletes from a wide variety of sports with asymptomatic LROM of the hip compared with matched controls...
August 1, 2017: American Journal of Sports Medicine
https://www.readbyqxmd.com/read/28818999/short-term-arrival-strategies-for-endurance-exercise-performance-at-moderate-altitude
#11
Joshua L Foss, Keren Constantini, Timothy D Mickleborough, Robert F Chapman
For sea level-based endurance athletes who compete at moderate and high altitudes, many are not logistically able to arrive at altitude weeks prior to the event to fully acclimatize. For those who can only arrive at altitude the night before competition, we asked if there is a physiological and performance advantage in reducing altitude exposure time to two hours prior to competition. On three separate visits, ten cyclists completed overnight laboratory exposures of: 1) a 14-hour exposure to normobaric hypoxia (16...
August 17, 2017: Journal of Applied Physiology
https://www.readbyqxmd.com/read/28818697/kinematic-differences-during-a-jump-cut-maneuver-between-individuals-with-and-without-a-concussion-history
#12
Andrew Lapointe, Luis Nolasco, Aniela Sosnowski, Eva Andrews, Douglas N Martini, Riann M Palmieri-Smith, Deanna H Gates, Steven P Broglio
Recent evidence suggests that athletes are at a higher risk of lower-body injuries in the months and years following a concussion. However, little is known about how people modify their movements post-concussion. This study examined kinematics during a jump cut motion in young adults with a concussion history (n=9; 4 males, 5 females; 3.1years' post-injury) and 10 controls (6 males, 4 females). Peak center of mass and peak knee angles during the landing phase of a jump-cut maneuver were evaluated. Participants with a concussion history demonstrated decreased knee varus (left: Mconc=-0...
August 14, 2017: International Journal of Psychophysiology
https://www.readbyqxmd.com/read/28818416/adolescent-sports-participation-e-cigarette-use-and-cigarette-smoking
#13
Phil Veliz, Sean Esteban McCabe, Vita V McCabe, Carol J Boyd
INTRODUCTION: Although sport participation among adolescents has been found to lower the risk of traditional cigarette smoking, no studies to date have assessed if this type of physical activity lowers the risk of e-cigarette use among adolescents. METHODS: National data from the 2014 and 2015 Monitoring the Future study of 12th-grade students were used and analyses were conducted in 2016. Measures for past 30-day e-cigarette use and traditional cigarette smoking were used to assess differences between adolescents who participated in at least one competitive sport during the past year and adolescents who did not...
August 14, 2017: American Journal of Preventive Medicine
https://www.readbyqxmd.com/read/28817510/elite-distance-runners-a-45-year-follow-up
#14
Sarah Everman, James W Farris, R Curtis Bay, Jack T Daniels
PURPOSE: The present longitudinal study assessed cardiorespiratory capacity and running economy of Olympic athletes over several decades to measure changes in fitness in an elite group during aging. METHODS: Twenty-six male runners training for the 1968 Olympics were recruited. Heart rate, VO2max, ventilation, and running economy were measured in 1968, 1993, and 2013. In 2013, 22 of the original runners participated: three passed away between 1993 and 2013, and one declined to participate...
August 16, 2017: Medicine and Science in Sports and Exercise
https://www.readbyqxmd.com/read/28817506/maximum-distance-and-high-speed-distance-demands-by-position-in-ncaa-division-i-collegiate-football-games
#15
Gabriel J Sanders, Brad Roll, Corey A Peacock
The purpose of the study was to quantify the average and maximum distances traveled by NCAA division I football athletes during competitive games. Utilizing global positioning system (GPS) devices (Catapult Sports), total and low, moderate and high speed distances were quantified by each position. Understanding maximal workloads can enhance conditioning practice periodization protocols. A total of 40 football athletes were included in the analysis. For the data to be included, athletes were required to participate in ≥ 75% of the offensive or defensive snaps for any given game...
July 5, 2017: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/28817505/the-effects-of-the-gaa15-on-lower-extremity-injury-incidence-and-neuromuscular-functional-outcomes-in-collegiate-gaelic-games
#16
Brenagh E Schlingermann, Clare A Lodge, Conor Gissane, Paula M Rankin
The purpose of this Observational Analytical Cohort Study was to assess the effectiveness of an injury prevention programme (IPP) - GAA15 (Gaelic Athletic Association 15) - on the incidence of injury in collegiate Gaelic games. 131 Gaelic games players (mean age 20.5 years ± SD 3.0) were used for analysis in this study. Participants completed preseason and postseason testing which involved performance of the Y Balance test. The GAA15 was employed for the intervention group; coaches were instructed to implement the programme before every training session and match throughout the collegiate GAA (Gaelic Athletic Association) season...
July 5, 2017: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/28817504/movement-demands-and-perceived-wellness-associated-with-pre-season-training-camp-in-ncaa-division-i-college-football-players
#17
Aaron D Wellman, Sam C Coad, Patrick J Flynn, Christopher P McLellan, Mike Climstein
The aims of the present study were to examine the movement demands of pre-season practice in National Collegiate Athletic Association (NCAA) division I college football players using portable global positioning system (GPS) technology and to assess perceived wellness associated with pre-season practice to determine if GPS-derived variables from the preceding day influence perceived wellness the following day. Twenty-nine players were monitored using GPS receivers (Catapult Innovations, Melbourne, Australia) during 20 pre-season practices...
July 5, 2017: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/28817414/systematic-selection-of-key-logistic-regression-variables-for-risk-prediction-analyses-a-five-factor-maximum-model
#18
Timothy E Hewett, Kate E Webster, Wendy J Hurd
GENERAL AND CRITICAL REVIEW FORMAT: The evolution of clinical practice and medical technology has yielded an increasing number of clinical measures and tests to assess a patient's progression and return to sport readiness after injury. The plethora of available tests may be burdensome to clinicians in the absence of evidence that demonstrates the utility of a given measurement. OBJECTIVE: Thus, there is a critical need to identify a discrete number of metrics to capture during clinical assessment to effectively and concisely guide patient care...
August 16, 2017: Clinical Journal of Sport Medicine: Official Journal of the Canadian Academy of Sport Medicine
https://www.readbyqxmd.com/read/28817413/actn3-r577x-polymorphism-is-associated-with-the-incidence-and-severity-of-injuries-in-professional-football-players
#19
Massidda Myosotis, Voisin Sarah, Culigioni Claudia, Piras Francesco, Cugia Paolo, Yan Xu, Eynon Nir, Carla M Calò
OBJECTIVE: The ACTN3 R577X gene variant results in the absence of the α-actinin-3 protein in ∼18% of humans worldwide and has been associated with athletic performance and increased susceptibility to eccentric muscle damage. The aim of this study was to investigate the association between ACTN3 R577X variant and indirect muscle disorders/injuries in professional football players. DESIGN: A case-control, genotype-phenotype association study. INTERVENTION: Two hundred fifty-seven male professional Italian football players (from Serie A, Primavera, Allievi, and Giovanissimi; age = 21...
August 16, 2017: Clinical Journal of Sport Medicine: Official Journal of the Canadian Academy of Sport Medicine
https://www.readbyqxmd.com/read/28817412/effect-of-physical-methods-of-lymphatic-drainage-on-postexercise-recovery-of-mixed-martial-arts-athletes
#20
Aleksandra Zebrowska, Robert Trybulski, Robert Roczniok, Wieslaw Marcol
OBJECTIVE: Physical methods are reported to be important for accelerating skeletal muscle regeneration, decreasing muscle soreness, and shortening of the recovery time. The aim of the study was to assess the effect of the physical methods of lymphatic drainage (PMLD) such as manual lymphatic drainage (MLD), the Bodyflow (BF) therapy, and lymphatic drainage by deep oscillation (DO) on postexercise regeneration of the forearm muscles of mixed martial arts (MMA) athletes. DESIGN AND METHODS: Eighty MMA athletes aged 27...
August 16, 2017: Clinical Journal of Sport Medicine: Official Journal of the Canadian Academy of Sport Medicine
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