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https://www.readbyqxmd.com/read/28624016/longitudinal-change-in-patellofemoral-cartilage-thickness-cartilage-t2-relaxation-times-and-subchondral-bone-plate-area-in-adolescent-vs-mature-athletes
#1
Adam G Culvenor, Wolfgang Wirth, Susanne Maschek, Heide Boeth, Gerd Diederichs, Georg Duda, Felix Eckstein
OBJECTIVE: Patellofemoral cartilage changes have been evaluated in knee trauma and osteoarthritis; however, little is known about changes in patellar and trochlear cartilage thickness, T2 relaxation-time and subchondral bone plate area (tAB) during growth. Our prospective study aimed to explore longitudinal change in patellofemoral cartilage thickness, T2 and tAB in adolescent athletes, and to compare these data with those of mature (i.e., adult) athletes. MATERIALS AND METHODS: 20 adolescent (age 16±1years) and 20 mature (46±5years) volleyball players were studied over 2-years (10 men and 10 women each group)...
July 2017: European Journal of Radiology
https://www.readbyqxmd.com/read/28605232/sensorimotor-control-of-the-shoulder-in-professional-volleyball-players-with-isolated-infraspinatus-muscle-atrophy
#2
Samuele Contemori, Andrea Biscarini, Fabio Massimo Botti, Daniele Busti, Roberto Panichi, Vito Enrico Pettorossi
CONTEXT: Isolated infraspinatus muscle atrophy (IIMA) only affects the hitting shoulder of overhead-activity athletes, and is caused by suprascapular nerve neuropathy. No study has assessed the static and dynamic stability of the shoulder in overhead professional athletes with IIMA to reveal possible shoulder sensorimotor alterations. OBJECTIVE: To assess the shoulder static stability, dynamic stability, and strength in professional volleyball players with IIMA and in healthy control players...
June 12, 2017: Journal of Sport Rehabilitation
https://www.readbyqxmd.com/read/28595162/rotator-cuff-tendinopathy-alters-the-muscle-activity-onset-and-kinematics-of-scapula
#3
Hio Teng Leong, Gabriel Yin-Fat Ng, Shing Chung Chan, Siu Ngor Fu
Athletes with rotator cuff (RC) tendinopathy demonstrate an aberrant pattern of scapular motion which might relate to deficits in the scapular muscles. This study aimed to determine whether alteration in scapular kinematics is associated with deficits in the activity onset of scapular muscles. Forty-three male volleyball players (17 asymptomatic and 26 with RC tendinopathy) joined the study. Three-dimensional scapular kinematics was quantified using an acromial marker cluster method. The activity onset of the upper (UT), middle (MT), and lower trapezius (LT), and serratus anterior (SA) during arm abduction was assessed with electromyography...
August 2017: Journal of Electromyography and Kinesiology
https://www.readbyqxmd.com/read/28566815/training-induced-changes-in-physical-performance-can-be-achieved-without-body-mass-reduction-after-eight-week-of-strength-and-injury-prevention-oriented-programme-in-volleyball-female-players
#4
M Lehnert, M Sigmund, P Lipinska, R Vařeková, M Hroch, Z Xaverová, P Stastny, P Háp, P Zmijewski
The purpose of the study was to analyse the changes in muscle strength, power, and somatic parameters in elite volleyball players after a specific pre-season training programme aimed at improving jumping and strength performance and injury prevention. Twelve junior female volleyball players participated in an 8-week training programme. Anthropometric characteristics, isokinetic peak torque (PT) single-joint knee flexion (H) and extension (Q) at 60º/s and 180º/s, counter movement jump (CMJ), squat jump (SJ), and reactive strength index (RSI) were measured before and after intervention...
June 2017: Biology of Sport
https://www.readbyqxmd.com/read/28566804/reticulocyte-and-erythrocyte-hypochromia-markers-in-detection-of-iron-deficiency-in-adolescent-female-athletes
#5
J Malczewska-Lenczowska, J Orysiak, B Szczepańska, D Turowski, K Burkhard-Jagodzińska, J Gajewski
The aim of this study was to analyse the effectiveness of new haematology parameters related to reticulocytes and mature red blood cells to differentiate pre latent and latent iron deficiency. The study included 219 female athletes (aged 15-20 years) representing volleyball, handball, cycling, canoeing, cross-country skiing, swimming and judo. To assess iron status the concentration of ferritin, soluble transferrin receptor (sTfR), iron and total iron binding capacity (TIBC) were determined in serum. In addition to blood morphology, the mean cellular haemoglobin content in erythrocytes (CH) and reticulocytes (CHr), mean cellular haemoglobin concentration in reticulocytes (CHCMr), the percentage of erythrocytes (HYPOm) and reticulocytes (HYPOr) with decreased cellular haemoglobin concentration, the percentage of erythrocytes (LowCHm) and reticulocytes (LowCHr) with decreased cellular haemoglobin content, and percentage of erythrocytes with decreased volume (MICROm) were determined...
June 2017: Biology of Sport
https://www.readbyqxmd.com/read/28558445/the-effect-of-beach-volleyball-training-on-muscle-performance-of-indoor-volleyball-players
#6
Dimitrios G Balasas, Kosmas Christoulas, Panagiotis Stefanidis, Efstratios Vamvakoudis, Theodoros M Bampouras
BACKGROUND: Beach volleyball is frequently used as a conditioning activity for indoor volleyball players, but little information exists regarding any performance benefits when transitioning from sand to hard court. The present study examined the effect of 12 weeks beach volleyball training on muscle performance of indoor volleyball players. METHODS: Eleven athletes who completed an indoor volleyball season and were willing to train and compete at beach volleyball, participated in the study...
May 30, 2017: Journal of Sports Medicine and Physical Fitness
https://www.readbyqxmd.com/read/28556762/evaluation-of-game-performance-in-elite-male-sitting-volleyball-players
#7
Bartosz Molik, Natalia Morgulec-Adamowicz, Jolanta Marszałek, Andrzej Kosmol, Izabela Rutkowska, Alicja Jakubicka, Ewelina Kaliszewska, Robert Kozłowski, Monika Kurowska, Elwira Ploch, Pavel Mustafins, Miguel-Ángel Gómez
The aims of the current study were (a) to analyze the differences in game performances of sitting volleyball athletes representing the different types of disabilities and (b) to assess whether the seated position vertical reach is one of the crucial factors in the game performance level of sitting volleyball athletes. One hundred male athletes from various national teams participating in the European Championships in Sitting Volleyball (2009) took part in this study. The athletes were categorized according to type of disability and the results of the vertical reach in a seated position...
April 2017: Adapted Physical Activity Quarterly: APAQ
https://www.readbyqxmd.com/read/28542004/do-dynamic-fat-and-fat-free-mass-changes-follow-theoretical-driven-rules-in-athletes
#8
Analiza M Silva, Catarina N Matias, Diana A Santos, Paulo M Rocha, Cláudia S Minderico, Diana Thomas, Steven B Heymsfield, Luís B Sardinha
INTRODUCTION: Maximizing fat mass (FM) loss while preserving or increasing fat-free mass (FFM) is a central goal for athletic performance but the composition of body weight (BW) changes over time with training are largely unknown. PURPOSE: We aimed to analyze FM and FFM contributions to BW changes and to test if these contributions follow established rules and predictions over one athletic season. METHODS: 70 athletes (42 males; handball, volleyball, basketball, triathlon, and swimming) were evaluated from the beginning to the competitive stage of the season and were empirically divided into those who lost (n=20) or gained >1...
May 23, 2017: Medicine and Science in Sports and Exercise
https://www.readbyqxmd.com/read/28535098/ball-contact-injuries-in-11-national-collegiate-athletic-association-sports-the-injury-surveillance-program-2009-2010-through-2014-2015
#9
Melissa A Fraser, Dustin R Grooms, Kevin M Guskiewicz, Zachary Y Kerr
CONTEXT:   Surveillance data regarding injuries caused by ball contact in collegiate athletes have not been well examined and are mostly limited to discussions of concussions and catastrophic injuries. OBJECTIVE:   To describe the epidemiology of ball-contact injuries in 11 National Collegiate Athletic Association (NCAA) sports during the 2009-2010 through 2014-2015 academic years. DESIGN:   Descriptive epidemiology study. SETTING:   Convenience sample of NCAA programs in 11 sports (men's football, women's field hockey, women's volleyball, men's baseball, women's softball, men's and women's basketball, men's and women's lacrosse, and men's and women's soccer) during the 2009-2010 through 2014-2015 academic years...
May 23, 2017: Journal of Athletic Training
https://www.readbyqxmd.com/read/28535096/mandated-high-school-concussion-education-and-collegiate-athletes-understanding-of-concussion
#10
Miriam Carroll-Alfano
CONTEXT:   Concussions in student-athletes are a serious problem. Most states have enacted legislation mandating concussion education for student-athletes, under the assumption that education leads to better self-reporting of concussions and improved knowledge of symptoms. OBJECTIVE:   (1) To determine the effect of state-based concussion legislation on the proportion of student-athletes receiving concussion education and to assess the moderation of this effect by gender and sport and (2) to assess the effect of concussion education on student-athletes' knowledge of concussion symptoms and likelihood of seeking treatment after a concussion...
May 23, 2017: Journal of Athletic Training
https://www.readbyqxmd.com/read/28515975/prospective-functional-performance-testing-and-relationship-to-lower-extremity-injury-incidence-in-adolescent-sports-participants
#11
Joseph Smith, Nick DePhillipo, Iris Kimura, Morgan Kocher, Ronald Hetzler
BACKGROUND: Due to the high number of adolescent athletes and subsequent lower extremity injuries, improvements of injury prevention strategies with emphasis on clinic-based and practical assessments are warranted. PURPOSE: The purpose of this study was to prospectively investigate if a battery of functional performance tests (FPT) could be used as a preseason-screening tool to identify adolescent athletes at risk for sports-related acute lower extremity injury via comparison of injured and uninjured subjects...
April 2017: International Journal of Sports Physical Therapy
https://www.readbyqxmd.com/read/28515832/a-low-dose-caffeine-and-carbohydrate-supplement-does-not-improve-athletic-performance-during-volleyball-competition
#12
David R Pfeifer, Kelsey M Arvin, Courtney N Herschberger, Nicholas J Haynes, Matthew S Renfrow
Dietary supplements are widely used to enhance sport performance and the combination of carbohydrate and caffeine (CHO+CAF) has yielded particularly high performance gains. Though the effects of a CHO+CAF supplement have been studied in a laboratory environment, little research exists on the effects of supplementation during competition. Therefore, the purpose of this study was to determine the effects of a CHO+CAF supplement on athletic performance in competition. Eight female collegiate volleyball players completed three testing sessions under three different conditions separated by approximately one week each: CHO+CAF supplement, placebo (PBO), and control (CTL) using a randomized, cross-over design...
2017: International Journal of Exercise Science
https://www.readbyqxmd.com/read/28514920/predicting-factors-of-zone-4-attack-in-volleyball
#13
Gustavo C Costa, Henrique O Castro, Breno F Evangelista, Laura M Malheiros, Pablo J Greco, Herbert Ugrinowitsch
This study examined 142 volleyball games of the Men's Super League 2014/2015 seasons in Brazil from which we analyzed 24-26 games of each participating team, identifying 5,267 Zone 4 attacks for further analysis. Within these Zone 4 attacks, we analyzed the association between the effect of the attack carried out and the separate effects of serve reception, tempo and type of attack. We found that the reception, tempo of attack, second tempo of attack, and power of diagonal attack were predictors of the attack effect in Zone 4...
June 2017: Perceptual and Motor Skills
https://www.readbyqxmd.com/read/28514233/energy-balance-over-one-athletic-season
#14
Analiza M Silva, Catarina N Matias, Diana A Santos, Diana Thomas, Anja Bosy-Westphal, Manfred J Müller, Steven B Heymsfield, Luís B Sardinha
INTRODUCTION: Magnitude and variation in energy balance (EB) components over an athletic season are largely unknown. PURPOSE: We investigated the longitudinal changes in EB over one season and explored the association between EB variation and the change in the main fat-free mass (FFM) components in highly trained athletes. METHODS: Eighty athletes (54 males; handball, volleyball, basketball, triathlete, and swimming) were evaluated from the beginning of the season to the main competition stage...
March 22, 2017: Medicine and Science in Sports and Exercise
https://www.readbyqxmd.com/read/28488924/effects-of-caffeine-on-countermovement-jump-performance-variables-in-elite-male-volleyball-players
#15
Hermann Zbinden-Foncea, Isabel Rada, Jesus Gomez, Marco Kokaly, Trent Stellingwerff, Louise Deldicque, Luis Peñailillo
PURPOSE: To examine the effects of a moderate dose of caffeine in elite male volleyball players on countermovement jump (CMJ) performance, as well as temporal concentric and eccentric phase effects. METHODS: Ten elite male volleyball players took part in two experimental days via a randomized cross-over trial 1 week apart in which they ingested either 5 mg/kg of caffeine or a placebo in double-blind fashion. Heart rate and blood pressure parameters were measured at rest and 60 min post-ingestion...
May 10, 2017: International Journal of Sports Physiology and Performance
https://www.readbyqxmd.com/read/28469755/can-different-complex-training-improve-the-individual-phenomenon-of-post-activation-potentiation
#16
Zong-Rong Chen, Shin-Liang Lo, Min-Hsien Wang, Ching-Fang Yu, Hsien-Te Peng
The aims of the present study were (a) to determine whether the two types of complex training and vibration complex training would improve the individual phenomenon of post-activation potentiation (PAP) for every athlete in a team setting; and (b) to compare the acute effect of resistance and plyometric exercise, whole body vibration, complex training and vibration complex training on vertical jump performance. The participants were ten male division I college volleyball and basketball players. They were asked to perform three vertical jumps as a pre-test and were then randomly assigned to one of five PAP protocols, resistance exercise using half squat exercise, plyometric exercise using drop jumps with individualized drop height, whole body vibration using squats on a vibration plate, complex training combining resistance exercise with plyometric exercise, vibration complex training combining whole body vibration with plyometric exercise...
February 2017: Journal of Human Kinetics
https://www.readbyqxmd.com/read/28447871/the-effects-of-specialization-and-sex-on-anterior-y-balance-performance-in-high-school-athletes
#17
Madeline M Miller, Jessica L Trapp, Eric G Post, Stephanie M Trigsted, Timothy A McGuine, M Alison Brooks, David R Bell
BACKGROUND: Sport specialization and movement asymmetry have been separately discussed as potential risk factors for lower extremity injury. Early specialization may lead to the development of movement asymmetries that can predispose an athlete to injury, but this has not been thoroughly examined. HYPOTHESIS: Athletes rated as specialized would exhibit greater between-limb anterior reach asymmetry and decreased anterior reach distance on the Y-balance test (YBT) as compared with nonspecialized high school athletes, and these differences would not be dependent on sex...
April 1, 2017: Sports Health
https://www.readbyqxmd.com/read/28416892/anthropometric-and-physical-characteristics-allow-differentiation-of-young-female-volleyball-players-according-to-playing-position-and-level-of-expertise
#18
M Milić, Z Grgantov, K Chamari, L P Ardigò, A Bianco, J Padulo
The aim of our study was to determine the differences in some anthropometric and physical performance variables of young Croatian female volleyball players (aged 13 to 15) in relation to playing position (i.e., independent variable) and performance level within each position (i.e., independent variable). Players were categorized according to playing position (i.e., role) as middle blockers (n=28), opposite hitters (n=41), passer-hitters (n=54), setters (n=30), and liberos (n=28). Within each position, players were divided into a more successful group and a less successful group according to team ranking in the latest regional championship and player quality within the team...
March 2017: Biology of Sport
https://www.readbyqxmd.com/read/28409510/combined-osteopathy-and-exercise-management-of-achilles-tendinopathy-in-an-athlete-a-case-report
#19
Georgia Ross, Chris Macfarlane, Brett Vaughan
Mid-portion Achilles tendinopathy is a common injury in sporting populations. There is conflicting evidence about the best approach to conservative management. This report focuses on the rehabilitation of an Achilles tendinopathy utilising osteopathic manual therapy (OMT) and a structured exercise program in a semi-professional volleyballer. The patient presented with a 4-month history of right mid-portion Achilles tendon pain that begun after a lateral inversion sprain of the right ankle. The primary complaint was pain impacting the patients vertical jump performance...
April 13, 2017: Journal of Sports Medicine and Physical Fitness
https://www.readbyqxmd.com/read/28409140/osteoid-osteoma-of-the-distal-clavicle
#20
Bernardo Barcellos Terra, Leandro Marano Rodrigues, David Victoria Hoffmann Padua, Tannous Jorge Sassine, José Maria Cavatte, Anderson De Nadai
The osteoid osteoma is a bone tumor that accounts for 10% of benign tumors. It was described in 1935 by Jaffe, as a tumor that affects the young adult population, with a predominance of males. This study aims to present a case of late diagnosis of a patient with osteoid osteoma of the distal clavicle region. Female patient, 44 years old, non-professional volleyball player, reported pain in the anterior and superior region of the shoulder girdle, specifically in the acromioclavicular joint, which worsened at night and had been treated for nine months as tendinitis of the rotator cuff and acromioclavicular joint arthritis...
March 2017: Revista Brasileira de Ortopedia
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