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https://www.readbyqxmd.com/read/27918704/comparison-of-3d-joint-angles-measured-with-the-kinect-2-0-skeletal-tracker-versus-a-marker-based-motion-capture-system
#1
Trent M Guess, Swithin Razu, Amirhossein Jahandar, Marjorie Skubic, Zhiyu Huo
The Microsoft Kinect is becoming a widely used tool for inexpensive, portable measurement of human motion with the potential to support clinical assessments of performance and function. In this study, the relative osteokinematic Cardan joint angles of the hip and knee were calculated using the Kinect 2.0 skeletal tracker. The pelvis segments of the default skeletal model were reoriented and three-dimensional joint angles were compared to a marker-based system during a drop vertical jump and a hip abduction motion...
December 5, 2016: Journal of Applied Biomechanics
https://www.readbyqxmd.com/read/27918689/vertical-jump-biomechanics-altered-with-virtual-overhead-goal
#2
Kevin R Ford, Anh-Dung Nguyen, Eric J Hegedus, Jeffrey B Taylor
Virtual environments with real-time feedback can simulate extrinsic goals that mimic real life conditions. The purpose was to compare jump performance and biomechanics with a physical overhead goal (POG) and with a virtual overhead goal (VOG). Fourteen female subjects participated (age: 18.8±1.1 years, height: 163.2±8.1 cm, weight 63.0±7.9 kg). Sagittal plane trunk, hip, and knee biomechanics were calculated during the landing and take-off phases of DVJ with different goal conditions. Repeated measures ANOVAs determined differences between goal conditions...
December 5, 2016: Journal of Applied Biomechanics
https://www.readbyqxmd.com/read/27918658/countermovement-jump-phase-characteristics-of-senior-and-academy-rugby-league-players
#3
John J McMahon, Shannon Murphy, Sophie J E Rej, Paul Comfort
PURPOSE: Gross measures of countermovement jump (CMJ) performance are commonly used to track maturational changes in neuromuscular function within rugby league (RL). The purpose of this study was to conduct both a gross and a more detailed temporal phase analysis of the CMJ performances of senior and academy RL players, to provide greater insight into how neuromuscular function differs between these groups. METHODS: Twenty senior and fourteen academy (under-19) male RL players performed three maximal effort CMJs on a force platform with forward dynamics subsequently employed to allow gross performance measures and entire kinetic and kinematic-time curves to be compared between groups...
December 5, 2016: International Journal of Sports Physiology and Performance
https://www.readbyqxmd.com/read/27918654/cold-water-immersion-and-contrast-water-therapy-do-not-improve-short-term-recovery-following-resistance-training
#4
Christos K Argus, James R Broatch, Aaron C Petersen, Remco Polman, David J Bishop, Shona Halson
PURPOSE: An athlete's ability to recover quickly is important when there is limited time between training and competition. As such, recovery strategies are commonly used to expedite the recovery process. The purpose of this study was to determine the effectiveness of both cold water immersion (CWI) and contrast water therapy (CWT) compared to control on short-term recovery (<4h) following a single full-body resistance training session. METHODS: Thirteen males (age, 26 ± 5 years; weight, 79 ± 7 kg; height, 177 ± 5 cm) were assessed for perceptual (fatigue and soreness) and performance measures (maximal voluntary isometric contraction (MVC) of the knee extensors, weighted and unweighted countermovement jumps) prior to and immediately following the training session...
December 5, 2016: International Journal of Sports Physiology and Performance
https://www.readbyqxmd.com/read/27874298/volitional-spine-stabilization-during-a-drop-vertical-jump-from-different-landing-heights-implications-for-anterior-cruciate-ligament-injury
#5
Ram Haddas, Troy Hooper, C Roger James, Phillip S Sizer
CONTEXT:  Volitional spine stabilization (VSS) during dynamic activities may alter trunk motion, but the role of the core musculature in positioning the trunk during landing tasks is unclear. OBJECTIVE:  To determine whether volitional core-muscle activation incorporated during a drop vertical jump alters lower extremity kinematics and kinetics, as well as trunk and lower extremity muscle activity at different landing heights. DESIGN:  Controlled laboratory study...
November 22, 2016: Journal of Athletic Training
https://www.readbyqxmd.com/read/27870698/risk-factors-for-injury-among-japanese-collegiate-players-of-american-football-based-on-performance-test-results
#6
Junta Iguchi, Yuya Watanabe, Misaka Kimura, Yoshihiko Fujisawa, Tatsuya Hojo, Yasuhiro Yuasa, Shinsuke Higashi, Kenji Kuzuhara
Iguchi, J, Watanabe, Y, Kimura, M, Fujisawa, Y, Hojo, T, Yuasa, Y, Higashi, S, and Kuzuhara, K. Risk factors for injury among Japanese collegiate players of American football based on performance test results. J Strength Cond Res 30(12): 3405-3411, 2016-The purpose of this study was to identify how risk factors for injury during American football are related to players' physical strength as determined using typical performance tests. One hundred 53 Japanese collegiate players of American football were recruited for this study...
December 2016: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/27859527/gait-mechanics-and-second-acl-rupture-implications-for-delaying-return-to-sport
#7
Jacob J Capin, Ashutosh Khandha, Ryan Zarzycki, Kurt Manal, Thomas S Buchanan, Lynn Snyder-Mackler
Second anterior cruciate ligament rupture is a common and devastating injury among young women who return to sport after ACL reconstruction, but it is inadequately understood. The purpose of this study was to compare gait biomechanics and return-to-sport time frames in a matched cohort of young female athletes who, after primary ACLR, returned to sport without re-injury or sustained a second ACL injury. Approximately 6 months after primary reconstruction, 14 young women (age 16 ± 2 years) involved in jumping, cutting, and pivoting sports underwent motion analysis testing after physical therapy and impairment resolution...
November 9, 2016: Journal of Orthopaedic Research: Official Publication of the Orthopaedic Research Society
https://www.readbyqxmd.com/read/27855131/patellar-tendinopathy-diagnosis-and-treatment
#8
David Figueroa, Francisco Figueroa, Rafael Calvo
Patellar tendinopathy is a common cause of pain in athletes' knees. Historically, it has been related to jumping sports, such as volleyball and basketball. Repetitive jumping generates a considerable load of energy in the extensor mechanism, leading to symptoms. The main pathophysiologic phenomenon in patellar tendinopathy is tendinosis, which is a degenerative disorder rather than an inflammatory disorder; therefore, the other popular term for this disease, tendinitis, is not appropriate. The nonsurgical treatment of patellar tendinopathy is focused on eccentric exercises and often has good results...
December 2016: Journal of the American Academy of Orthopaedic Surgeons
https://www.readbyqxmd.com/read/27844453/explosive-movement-in-the-older-men-analysis-and-comparative-study-of-vertical-jump
#9
Sébastien Argaud, Benoit Pairot de Fontenay, Yoann Blache, Karine Monteil
BACKGROUND: Loss of power has been demonstrated to have severe functional consequences to perform physical daily living tasks in old age. PURPOSE: This study aimed to assess how moment and velocity were affected for each joint of the lower limbs during squat jumping for older men in comparison with young adults. METHODS: Twenty-one healthy older men (74.5 ± 4.6 years) and 22 young men (21.8 ± 2.8 years) performed maximal squat jumps...
November 14, 2016: Aging Clinical and Experimental Research
https://www.readbyqxmd.com/read/27818986/anterior-avulsion-fracture-of-the-tibial-tuberosity-in-adolescents-two-case-reports
#10
Aleilimar Teixeira da Silva Júnior, Leonardo Jorge da Silva, Ulbiramar Correia da Silva Filho, Edmundo Medeiros Teixeira, Helder Rocha Silva Araújo, Frederico Barra de Moraes
The objective here was to report two rare cases of anterior avulsion fracture of the tibial tuberosity in adolescents. Case 1 was a 15-year-old male who became injured through landing on his left knee and presented limited extension. Case 2 was a 16-year-old basketball player who presented sudden pain in the right knee and functional incapacity, after a jump. Imaging examinations (radiographs and computed tomography) showed anterior avulsion fractures of the tibial tuberosity. Surgical fixation was performed using screws and anchors, while avoiding growth plate injury...
September 2016: Revista Brasileira de Ortopedia
https://www.readbyqxmd.com/read/27816458/normalization-influences-knee-abduction-moment-results-could-it-influence-acl-injury-research-too
#11
Marc F Norcross, Samuel T Johnson, Christine D Pollard, Eun Wook Chang, Mark A Hoffman
OBJECTIVES: Normalization of joint moments to reduce anthropometric influences prior to making group comparisons is a widely-accepted practice. However, a seminal prospective study reported greater non-normalized knee abduction moment (KAM) in nine females who subsequently sustained an ACL injury. It is not clear if this finding may have been influenced by the fact that the ACL-injured females were on average 3.6cm taller and 2.4kg heavier than uninjured females. DESIGN: Cross-sectional...
October 21, 2016: Journal of Science and Medicine in Sport
https://www.readbyqxmd.com/read/27793803/biomechanical-effects-of-an-injury-prevention-program-in-preadolescent-female-soccer-athletes
#12
Julie A Thompson, Andrew A Tran, Corey T Gatewood, Rebecca Shultz, Amy Silder, Scott L Delp, Jason L Dragoo
BACKGROUND: Anterior cruciate ligament (ACL) injuries are common, and children as young as 10 years of age exhibit movement patterns associated with an ACL injury risk. Prevention programs have been shown to reduce injury rates, but the mechanisms behind these programs are largely unknown. Few studies have investigated biomechanical changes after injury prevention programs in children. PURPOSE/HYPOTHESIS: To investigate the effects of the F-MARC 11+ injury prevention warm-up program on changes to biomechanical risk factors for an ACL injury in preadolescent female soccer players...
October 28, 2016: American Journal of Sports Medicine
https://www.readbyqxmd.com/read/27792220/anterior-cruciate-ligament-injury-profile-in-italian-serie-a1-a2-women-s-volleyball-league
#13
Francesca Devetag, Massimiliano Mazzilli, Roberto Benis, Antonio La Torre, Matteo Bonato
BACKGROUND: The aim of this study was to assess how anterior cruciate ligament (ACL) ruptures with subsequently surgery reconstruction were sustaining during the professional career of women's' volleyball players of A1-A2 Italian volleyball league. METHODS: Using an observational study with a retrospective case-series design for ACL ruptures, 125 teams with 1488 players were monitored. Subjects had to report level, role, injury modality, lower limb injured, laterality, period of the season and age...
October 28, 2016: Journal of Sports Medicine and Physical Fitness
https://www.readbyqxmd.com/read/27789072/long-term-results-of-arthroscopic-arthrolysis-for-arthrofibrosis-after-anterior-cruciate-ligament-reconstruction
#14
Hermann O Mayr, Christian M Brandt, Thomas Weig, Manuel Koehne, Anke Bernstein, Norbert P Suedkamp, Robert Hube, Amelie Stoehr
PURPOSE: The current study was conducted to evaluate the long-term clinical and radiological outcomes after arthroscopic arthrolysis for arthrofibrosis after anterior cruciate ligament reconstruction (ACLR). METHODS: All patients treated with arthrolysis between 1990 and 1998 were included. Indication was arthrofibrosis in at least one knee compartment or a cyclops syndrome limiting range of motion (ROM) by > 5° of extension deficit and 15° of flexion deficit...
October 24, 2016: Arthroscopy: the Journal of Arthroscopic & related Surgery
https://www.readbyqxmd.com/read/27784638/impact-attenuation-properties-of-jazz-shoes-alter-lower-limb-joint-stiffness-during-jump-landings
#15
Alycia Fong Yan, Richard M Smith, Claire E Hiller, Peter J Sinclair
OBJECTIVES: To quantify the impact attenuation properties of the jazz shoes, and to investigate the in-vivo effect of four jazz shoe designs on lower limb joint stiffness during a dance-specific jump. DESIGN: Repeated measures. METHODS: A custom-built mechanical shoe tester similar to that used by athletic shoe companies was used to vertically impact the forefoot and heel region of four different jazz shoe designs. Additionally, dancers performed eight sautés in second position in bare feet and the shoe conditions...
October 5, 2016: Journal of Science and Medicine in Sport
https://www.readbyqxmd.com/read/27770784/effects-of-two-neuromuscular-training-programs-on-running-biomechanics-with-load-carriage-a-study-protocol-for-a-randomised-controlled-trial
#16
Bernard X W Liew, Susan Morris, Justin W L Keogh, Brendyn Appleby, Kevin Netto
BACKGROUND: In recent years, athletes have ventured into ultra-endurance and adventure racing events, which tests their ability to race, navigate, and survive. These events often require race participants to carry some form of load, to bear equipment for navigation and survival purposes. Previous studies have reported specific alterations in biomechanics when running with load which potentially influence running performance and injury risk. We hypothesize that a biomechanically informed neuromuscular training program would optimize running mechanics during load carriage to a greater extent than a generic strength training program...
October 22, 2016: BMC Musculoskeletal Disorders
https://www.readbyqxmd.com/read/27756572/musculoskeletal-modeling-of-human-lower-limb-during-normal-walking-one-legged-forward-hopping-and-side-jumping-comparison-of-measured-emg-and-predicted-muscle-activity-patterns
#17
A D Wibawa, N Verdonschot, J P K Halbertsma, J G M Burgerhof, R L Diercks, G J Verkerke
This study focused on comparing muscle activities predicted by the Musculoskeletal Modeling System with EMG from ten healthy subjects who performed normal walking, one-legged forward hopping and side jumping. Eight EMG electrodes measured the activity of eight right leg muscles. Specific thresholds per muscle were applied on the EMG prior comparison. These thresholds were determined by equalizing the duration of EMG to AMS muscle activity. Three graph variables, number of onsets, offsets and hills were used to quantify the level of agreement by using Cohen׳s kappa analysis...
October 6, 2016: Journal of Biomechanics
https://www.readbyqxmd.com/read/27756277/increasing-physical-activity-among-young-children-from-disadvantaged-communities-study-protocol-of-a-group-randomised-controlled-effectiveness-trial
#18
Rebecca M Stanley, Rachel A Jones, Dylan P Cliff, Stewart G Trost, Donna Berthelsen, Jo Salmon, Marijka Batterham, Simon Eckermann, John J Reilly, Ngiare Brown, Karen J Mickle, Steven J Howard, Trina Hinkley, Xanne Janssen, Paul Chandler, Penny Cross, Fay Gowers, Anthony D Okely
BACKGROUND: Participation in regular physical activity (PA) during the early years helps children achieve healthy body weight and can substantially improve motor development, bone health, psychosocial health and cognitive development. Despite common assumptions that young children are naturally active, evidence shows that they are insufficiently active for health and developmental benefits. Exploring strategies to increase physical activity in young children is a public health and research priority...
October 19, 2016: BMC Public Health
https://www.readbyqxmd.com/read/27705063/a-comparison-of-body-segment-inertial-parameter-estimation-methods-and-joint-moment-and-power-calculations-during-a-drop-vertical-jump-in-collegiate-female-soccer-players
#19
Sara L Arena, Kelsey McLaughlin, Anh-Dung Nguyen, James M Smoliga, Kevin R Ford
Athletic individuals may differ in body segment inertial parameter (BSIP) estimates due to differences in body composition, and this may influence calculation of joint kinetics. The purposes of this study were to 1) compare BSIPs predicted by the method introduced by de Leva(1) with DXA-derived BSIPs in collegiate female soccer players, and 2) examine the effects of these BSIPs estimation methods on joint moment and power calculations during a drop vertical jump (DVJ). Twenty female NCAA Division 1 soccer players were recruited...
October 5, 2016: Journal of Applied Biomechanics
https://www.readbyqxmd.com/read/27704484/effect-of-plyometric-training-on-vertical-jump-performance-in-female-athletes-a-systematic-review-and-meta-analysis
#20
Emilija Stojanović, Vladimir Ristić, Daniel Travis McMaster, Zoran Milanović
BACKGROUND: Plyometric training is an effective method to prevent knee injuries in female athletes; however, the effects of plyometric training on jump performance in female athletes is unclear. OBJECTIVE: The aim of this systematic review and meta-analysis was to determine the effectiveness of plyometric training on vertical jump (VJ) performance of amateur, collegiate and elite female athletes. METHODS: Six electronic databases were searched (PubMed, MEDLINE, ERIC, Google Scholar, SCIndex and ScienceDirect)...
October 4, 2016: Sports Medicine
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