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https://www.readbyqxmd.com/read/28095108/the-relationship-between-2d-knee-valgus-angle-during-single-leg-squat-single-leg-land-and-drop-jump-screening-tests
#1
Allan Munro, Lee Herrington, Paul Comfort
CONTEXT: Anterior Cruciate Ligament (ACL) and Patellofemoral Joint (PFJ) injuries are a significant problem among female athletes. A number of screening tasks have been used in the literature to identify those at greatest risk of injury. To date, no study has examined the relationship in two-dimensional (2D) knee valgus between common screening tasks to determine whether individuals exhibit similar movement patterns across tasks. OBJECTIVE: to establish whether frontal plane projection angle (FPPA) during the single leg squat (SLS), single leg land (SLL) and drop jump (DJ) are related...
January 17, 2017: Journal of Sport Rehabilitation
https://www.readbyqxmd.com/read/28074722/-an-adolescent-with-inability-to-bear-weight-on-his-knee-after-a-jump
#2
K E Mager, J G M Frenken, M Guijt
A 15-year-old boy sustained a left tuberositas tibiae avulsion fracture as a result of jumping. This type of fracture typically occurs in adolescent boys during sports.
2017: Nederlands Tijdschrift Voor Geneeskunde
https://www.readbyqxmd.com/read/28063610/ultrasound-measurements-of-skeletal-muscle-architecture-are-associated-with-strength-and-functional-capacity-in-older-adults
#3
Isaac Selva Raj, Stephen R Bird, Anthony J Shield
The goal of this study was to determine whether ultrasound measures of muscle architecture can be used to infer strength and functional capacity in older adults. Thirty-six healthy older adults (aged 68.2 ± 5.3 y) undertook isokinetic dynamometry for isometric and isokinetic concentric knee extensor strength, the 6-m fast walk, timed up and go, stair climb and descent and vertical jump tests. Longitudinal brightness-mode ultrasound scans (probe frequency, 10 MHz) of the vastus lateralis, vastus intermedius, rectus femoris and gastrocnemius medialis were obtained, and muscle architecture measures (thickness, fascicle pennation angle and fascicle length) were correlated with the aforementioned strength and functional measures...
January 4, 2017: Ultrasound in Medicine & Biology
https://www.readbyqxmd.com/read/28062120/robotic-simulation-of-identical-athletic-task-kinematics-on-cadaveric-limbs-exhibits-a-lack-of-differences-in-knee-mechanics-between-contralateral-pairs
#4
Nathaniel A Bates, April L McPhearson, Rebecca J Nesbitt, Jason T Shearn, Gregory D Myer, Timothy E Hewett
Limb asymmetry is a known factor for increased ACL injury risk. These asymmetries are normally observed during in vivo testing. Prior studies have developed in vitro testing methodologies driven by in vivo kinematics to investigate knee mechanics relative to ACL injury. The objective of this study was to determine if mechanical side-to-side asymmetries persist in contralateral pairs during in vitro simulation testing. In vivo kinematics were recorded for male and female drop vertical jump and sidestep cutting tasks...
December 29, 2016: Journal of Biomechanics
https://www.readbyqxmd.com/read/28060035/etiology-and-recovery-of-neuromuscular-fatigue-following-simulated-soccer-match-play
#5
Kevin Thomas, Jack Dent, Glyn Howatson, Stuart Goodall
PURPOSE: We profiled the etiology and recovery of neuromuscular fatigue post-simulated-soccer-match-play. METHODS: Fifteen semi-professional players completed a 90 min simulated soccer match. Pre-, immediately-post and at 24, 48 and 72 h participants completed a battery of neuromuscular, physical and perceptual tests. Perceived fatigue and muscle soreness were assessed via visual analogue scales. Maximum voluntary contraction (MVC) and twitch responses to electrical (femoral nerve) and magnetic (motor cortex) stimulation during isometric knee-extensor contractions and at rest were measured to assess central (voluntary activation, VA) and peripheral (quadriceps potentiated twitch force, Qtw,pot) fatigue, and responses to single and paired-magnetic stimuli were assessed to quantify corticospinal excitability and short-intracortical inhibition (SICI), respectively...
January 3, 2017: Medicine and Science in Sports and Exercise
https://www.readbyqxmd.com/read/28053820/effects-of-different-concurrent-resistance-and-aerobic-training-frequencies-on-muscle-power-and-muscle-quality-in-trained-elderly-men-a-randomized-clinical-trial
#6
Rodrigo Ferrari, Sandra C Fuchs, Luiz Fernando Martins Kruel, Eduardo Lusa Cadore, Cristine Lima Alberton, Ronei Silveira Pinto, Régis Radaelli, Maira Schoenell, Mikel Izquierdo, Hirofumi Tanaka, Daniel Umpierre
Muscle power is a strong predictor of functional status in the elderly population and is required to perform different daily activities. To compare the effects of different weekly training frequencies on muscle power and muscle quality induced by concurrent training (resistance + aerobic) in previously trained elderly men. Twenty-four trained elderly men (65 ± 4 years), previously engaged in a regular concurrent training program, three times per week, for the previous five months, were randomly allocated to concurrent training programs in which training was performed either twice a week (2·week(-1), n = 12) or three times per week (3·week(-1), n = 12)...
December 2016: Aging and Disease
https://www.readbyqxmd.com/read/28013024/sex-differences-in-total-frontal-plane-knee-movement-and-velocity-during-a-functional-single-leg-landing
#7
Walter L Jenkins, D S Blaise Williams, Kelsey Williams, Josh Hefner, Hannah Welch
OBJECTIVES: Females land with more knee valgus than males. While most studies have evaluated lower extremity mechanics during double leg landing, most sports require single-leg landing from a double or single leg takeoff. Further, knee movement occurs toward both varus and valgus during functional landing. The purpose of this study was to determine if differences exist between females and males in total frontal plane movement and velocity of the knee during single-leg landing. DESIGN: Experimental cohort...
September 6, 2016: Physical Therapy in Sport
https://www.readbyqxmd.com/read/28006992/increasing-hip-and-knee-flexion-during-a-drop-jump-task-reduces-tibiofemoral-shear-and-compressive-forces-implications-for-acl-injury-prevention-training
#8
Liang-Ching Tsai, Yi-An Ko, Kyle E Hammond, John W Xerogeanes, Gordon L Warren, Christopher M Powers
Although most ACL injury prevention programmes encourage greater hip and knee flexion during landing, it remains unknown how this technique influences tibiofemoral joint forces. We examined whether a landing strategy utilising greater hip and knee flexion decreases tibiofemoral anterior shear and compression. Twelve healthy women (25.9 ± 3.5 years) performed a drop-jump task before and after a training session (10-15 min) that emphasised greater hip and knee flexion. Peak tibiofemoral anterior shear and compressive forces were calculated using an electromyography (EMG)-driven knee model that incorporated joint kinematics, EMG and participant-specific muscle volumes and patella tendon orientation measured using magnetic resonance imaging (MRI)...
December 23, 2016: Journal of Sports Sciences
https://www.readbyqxmd.com/read/28002905/arthroscopic-all-inside-treatment-of-popliteomeniscal-fascicles-tears-surgical-technique-and-results-from-the-first-6-consecutive-patients
#9
R Simonetta, G Di Vico, R Papalia, S Vasta, V Denaro
Athletes whose knees are subjected to sudden changes of direction and high jumps such as martial arts athletes, dancers, wrestlers and football players are at higher risk of injuring popliteomeniscal fascicles. Painful squatting and mechanical symptoms such as locking sensation are common. Current available treatments includes open or arthroscopic in repair. Arthroscopic repair with all-inside device can relieve symptoms and restore knee function. Six patients from two surgical centers with isolated popliteomeniscal fascicles tears were treated with arthroscopic all-inside repair...
October 2016: Journal of Biological Regulators and Homeostatic Agents
https://www.readbyqxmd.com/read/27984842/asymmetry-of-inter-joint-coordination-during-single-leg-jump-after-anterior-cruciate-ligament-reconstruction
#10
Y Blache, B Pairot de Fontenay, S Argaud, K Monteil
Little is known about the contralateral asymmetry in inter-joint coordination after anterior cruciate ligament reconstruction (ACL-R) during multi-segmental movements. This study aimed to evaluate inter-joint coordination asymmetry between the injured (IL) and non-injured leg (NIL) in patients after ACL-R during single-leg jumping. 12 male patients having undergone ACL-R (7.3 months post-surgery) and 12 healthy males performed maximal vertical single-leg jumps with the right and left leg. The kinematics of each jump were recorded...
December 16, 2016: International Journal of Sports Medicine
https://www.readbyqxmd.com/read/27942700/lower-extremity-biomechanical-demands-during-saut-de-chat-leaps
#11
Danielle N Jarvis, Kornelia Kulig
: In dance, high demands are placed on the lower extremity joints during jumping tasks. The purpose of this study was to compare biomechanical demands placed on the lower extremity joints during the takeoff and landing phases of saut de chat leaps. METHODS: Thirty healthy, experienced dancers with 20.8±4.9 yrs of dance training performed 5 saut de chat leaps. A three-dimensional motion analysis system and force plates were used to collect kinematic and kinetic data...
December 2016: Medical Problems of Performing Artists
https://www.readbyqxmd.com/read/27942136/comparison-of-whole-body-vibration-exercise-and-plyometric-exercise-to-improve-isokinetic-muscular-strength-jumping-performance-and-balance-of-female-volleyball-players
#12
Yong-Youn Kim, Si-Eun Park
[Purpose] The purpose of this study was to assess the effect of whole-body vibration exercise and plyometric exercise on female volleyball players. [Subjects and Methods] Subjects were randomly allocated to two exercise groups (whole-body vibration exercise group and plyometric exercise group). The exercise was conducted three times each week for 8 weeks. Isokinetic muscular strength, jumping performance, and balance were measured before starting the exercise and after finishing the 8 weeks of exercise. [Results] Measurements of isokinetic muscular strength revealed that the whole-body vibration exercise group showed significant increase after the exercise...
November 2016: Journal of Physical Therapy Science
https://www.readbyqxmd.com/read/27941163/effects-of-accumulating-work-shifts-on-performance-based-fatigue-using-multiple-strength-measurements-in-day-and-night-shift-nurses-and-aides
#13
Brennan J Thompson, Matt S Stock, Victoria K Banuelas
OBJECTIVE: This study aimed to examine the effects of accumulating nursing work on maximal and rapid strength characteristics in female nurses and compare these effects in day versus night shift workers. BACKGROUND: Nurses exhibit among the highest nonfatal injury rates of all occupations, which may be a consequence of long, cumulative work shift schedules. Fatigue may accumulate across multiple shifts and lead to performance impairments, which in turn may be linked to injury risks...
December 9, 2016: Human Factors
https://www.readbyqxmd.com/read/27935067/asymmetry-of-lower-extremity-force-and-muscle-activation-during-knee-extension-and-functional-tasks
#14
Colin W Bond, Summer B Cook, Erik E Swartz, Dain P LaRoche
INTRODUCTION: Strength and power asymmetries >10% may negatively impact physical function. METHODS: Twenty-four healthy participants, aged 30-60 yrs, were assessed for muscle power asymmetry during isokinetic knee extension and ground reaction force asymmetry during chair-rise and vertical jump tasks. Neuromuscular activation asymmetry and coactivation of vastus lateralis (VL) and biceps femoris (BF) were assessed in each condition. Symmetric (SG) and asymmetric groups (AG) were identified using a 10% knee extension power asymmetry criterion...
December 9, 2016: Muscle & Nerve
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
#15
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
#16
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
#17
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
#18
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
#19
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
#20
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
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