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https://www.readbyqxmd.com/read/29449001/balance-assessment-during-squatting-exercise-a-comparison-between-laboratory-grade-force-plate-and-a-commercial-low-cost-device
#1
Alessandro Mengarelli, Federica Verdini, Stefano Cardarelli, Francesco Di Nardo, Laura Burattini, Sandro Fioretti
Testing balance through squatting exercise is a central part of many rehabilitation programs and sports and plays also an important role in clinical evaluation of residual motor ability. The assessment of center of pressure (CoP) displacement and its parametrization is commonly used to describe and analyze squat movement and the laboratory-grade force plates (FP) are the gold standard for measuring balance performances from a dynamic view-point. However, the Nintendo Wii Balance Board (NWBB) has been recently proposed as an inexpensive and easily available device for measuring ground reaction force and CoP displacement in standing balance tasks...
February 5, 2018: Journal of Biomechanics
https://www.readbyqxmd.com/read/29443822/power-to-strength-ratio-influences-performance-enhancement-with-contrast-training
#2
Knut Thomas Schneiker, Jackson James Fyfe, Francois Billaut, David John Bishop
PURPOSE: The effectiveness of contrast training (CST) for improving explosive exercise performance is modulated by various individual characteristics; however, further work is required to define these factors. METHODS: Sub-elite male Australian Football players [n = 22; age, 19 ± 2 y; body mass, 80.4 ± 9.4 kg; one-repetition maximum (1-RM) half squat, 172 ± 18 kg; mean ± SD] completed two experimental trials involving two sets of squat jumps (6 repetitions at 30% 1-RM) performed either alone (CTL condition) or after half squats (6 repetitions at 85% 1-RM; CST condition)...
February 13, 2018: Medicine and Science in Sports and Exercise
https://www.readbyqxmd.com/read/29439949/lower-limb-biomechanics-in-femoroacetabular-impingement-syndrome-a-systematic-review-and-meta-analysis
#3
REVIEW
Matthew G King, Peter R Lawrenson, Adam I Semciw, Kane J Middleton, Kay M Crossley
OBJECTIVE: (1) Identify differences in hip and pelvic biomechanics in patients with femoroacetabular impingement syndrome (FAIS) compared with controls during everyday activities (eg, walking, squatting); and (2) evaluate the effects of interventions on hip and pelvic biomechanics during everyday activities. DESIGN: Systematic review. DATA SOURCES: Medline, CINAHL, EMBASE, Scopus and SPORTDiscus until February 2017. METHODS: Primary aim: studies that investigated hip or pelvic kinematics and/or joint torques of everyday activities in patients with FAIS compared with the asymptomatic contralateral limb or a control group...
February 13, 2018: British Journal of Sports Medicine
https://www.readbyqxmd.com/read/29436742/biomechanical-influence-of-deficient-posterolateral-corner-structures-on-knee-joint-kinematics-a-computational-study
#4
Kyoung-Tak Kang, Yong-Gon Koh, Juhyun Son, Moonki Jung, Sangyun Oh, Sung-Jae Kim, Sung-Hwan Kim
The posterolateral corner (PLC) structures including the popliteofibular ligament (PFL), popliteus tendon (PT) and lateral collateral ligament (LCL) are important soft tissues for posterior translational, external rotational and varus angulation knee joint instabilities. The purpose of this study was to determine the effects of deficient PLC structures on the kinematics of the knee joint under gait and squat loading conditions. We developed subject-specific computational models with full 12-degree-of-freedom tibiofemoral and patellofemoral joints for four male subjects and one female subject...
February 13, 2018: Journal of Orthopaedic Research: Official Publication of the Orthopaedic Research Society
https://www.readbyqxmd.com/read/29436087/training-using-a-new-multidirectional-reach-tool-improves-balance-in-individuals-with-stroke
#5
Numpung Khumsapsiri, Akkradate Siriphorn, Kanokporn Pooranawatthanakul, Tanyarut Oungphalachai
BACKGROUND AND PURPOSE: Previous studies suggested that limits of stability (LOS) training with visual feedback using commercial equipment could be used to improve balance ability in individuals with stroke. However, this system is expensive. In this study, we created a new tool from inexpensive elements based on LOS training using visual feedback. The aim of this study was to investigate the effect of training using a new multidirectional reach tool on balance in individuals with stroke...
February 13, 2018: Physiotherapy Research International: the Journal for Researchers and Clinicians in Physical Therapy
https://www.readbyqxmd.com/read/29430055/conservative-management-of-mri-confirmed-knee-osteoarthritis-with-instrument-assisted-soft-tissue-mobilization-joint-manipulation-and-platelet-rich-plasma
#6
Arif Karmali
Objective: To describe the successful conservative management of a patient with chronic degenerative knee pain. Clinical Features: An active 47 year-old female office-worker with intermittent right knee pain inferolateral to the right patella for eight months described difficulty ascending stairs, sitting on a chair for one hour, and squatting. A physical exam led to the diagnosis of a suspected chronic degenerative tear of the posterior horn of the right medial meniscus and chronic right subpatellar chondrosis, in addition to extensive cartilaginous degeneration revealed by an MRI study conducted prior to initial presentation...
December 2017: Journal of the Canadian Chiropractic Association
https://www.readbyqxmd.com/read/29420390/specific-adaptations-in-performance-and-muscle-architecture-after-weighted-jump-squat-vs-body-mass-squat-jump-training-in-recreational-soccer-players
#7
Giuseppe Coratella, Marco Beato, Chiara Milanese, Stefano Longo, Eloisa Limonta, Susanna Rampichini, Emiliano Cè, Angela Valentina Bisconti, F Schena, F Esposito
The aim of the present study was to compare the effects of weighted jump squat (WJST) vs body mass squat jump training (BMSJT) on quadriceps muscle architecture, lower-limb lean-mass (LM) and muscle strength, performance in change of direction (COD), sprint and jump in recreational soccer-players. Forty-eight healthy soccer-players participated in an off-season randomized controlled-trial. Before and after an eight-week training intervention, vastus lateralis pennation angle, fascicle length, muscle thickness, LM, squat 1-RM, quadriceps and hamstrings isokinetic peak-torque, agility T-test, 10 and 30m sprint and squat-jump (SJ) were measured...
February 6, 2018: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/29420236/risk-factors-diagnosis-and-non-surgical-treatment-for-meniscal-tears-evidence-and-recommendations-a-statement-paper-commissioned-by-the-danish-society-of-sports-physical-therapy-dssf
#8
Jonas Bloch Thorlund, Carsten Bogh Juhl, Lina Holm Ingelsrud, Søren Thorgaard Skou
This statement aimed at summarising and appraising the available evidence for risk factors, diagnostic tools and non-surgical treatments for patients with meniscal tears. We systematically searched electronic databases using a pragmatic search strategy approach. Included studies were synthesised quantitatively or qualitatively, as appropriate. Strength of evidence was determined according to the Grading of Recommendations Assessment Development and Evaluation framework. Low-quality evidence suggested that overweight (degenerative tears, k=3), male sex (k=4), contact and pivoting sports (k=2), and frequent occupational kneeling/squatting (k=3) were risk factors for meniscal tears...
February 2, 2018: British Journal of Sports Medicine
https://www.readbyqxmd.com/read/29407520/the-effect-of-whole-body-vibration-on-sagittal-plane-running-mechanics-in-individuals-with-anterior-cruciate-ligament-reconstruction-a-randomized-crossover-trial
#9
Derek N Pamukoff, Melissa M Montgomery, Kevin Choe, Tyler J Moffit, Michael N Vakula
OBJECTIVE: To examine the effect of whole body vibration (WBV) on running biomechanics in individuals with anterior cruciate ligament reconstruction (ACLR). DESIGN: Single-blind randomized crossover trial. SETTING: Research laboratory. PARTICIPANTS: 20 individuals with unilateral ACLR (age=22.3 (3.3) years; mass=71.8 (15.3) kg; time since ACLR=44.9 (22.8) months; 15 females, 10 patellar tendon autograft, 7 hamstrings autograft, 3 allograft; International Knee Documentation Committee Score=83...
January 30, 2018: Archives of Physical Medicine and Rehabilitation
https://www.readbyqxmd.com/read/29405842/familiarization-validity-and-smallest-detectable-difference-of-the-isometric-squat-test-in-evaluating-maximal-strength
#10
David Drake, Rodney Kennedy, Eric Wallace
Isometric multi-joint tests are considered reliable and have strong relationships with 1RM performance. However, limited evidence is available for the isometric squat in terms of effects of familiarization and reliability. This study aimed to assess, the effect of familiarization, stability reliability, determine the smallest detectible difference, and the correlation of the isometric squat test with 1RM squat performance. Thirty-six strength-trained participants volunteered to take part in this study. Following three familiarization sessions, test-retest reliability was evaluated with a 48-hour window between each time point...
February 6, 2018: Journal of Sports Sciences
https://www.readbyqxmd.com/read/29401203/the-effect-of-accommodating-resistance-on-the-post-activation-potentiation-response-in-rugby-league-players
#11
David J Scott, Massimiliano Ditroilo, Phil Marshall
This study examined the post-activation potentiation (PAP) response of two conditioning activities (CA), the hexbar deadlift (HBD) and back squat (BS), combined with accommodating resistance; this adds a percentage of the total resistance during the exercise. Twenty amateur rugby league players performed two experimental trials and a control trial without a CA. Participants performed a countermovement jump (CMJ) before and 30, 90, and 180 seconds after one set of three repetitions of each CA at 70% 1 repetition maximum (RM), with up to an additional 23% 1RM from accommodating resistance...
February 1, 2018: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/29401202/effects-of-different-plyometric-training-frequency-on-measures-of-athletic-performance-in-prepuberal-male-soccer-players
#12
Raja Bouguezzi, Helmi Chaabene, Yassine Negra, Rodrigo Ramirez-Campillo, Zied Jlalia, Bessem Mkaouer, Younés Hachana
This study aimed to compare the effects of one vs. two sessions of equal-weekly volume plyometric training (PT) across 8 weeks on measures of athletic performance (i.e., sprint-time, change of direction [CoD], jumping ability, and muscle strength) in prepuberal male soccer players. Thirty participants were randomly assigned either to one session PT group (1SPT [n=15]) or two sessions PT group (2SPT [n=15]). Plyometric training was integrated into their regular soccer training routine. Pre- and post-training tests for the assessment of sprint-time (e...
February 1, 2018: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/29401194/anthropometric-and-physiological-characteristics-of-brazilian-jiu-jitsu-athletes
#13
Karsten Øvretveit
The aim of this study was to describe anthropometric and physiological characteristics of Brazilian jiu-jitsu (BJJ) athletes. For this purpose, 42 male athletes were recruited from one of the largest BJJ academies in central Norway. The subjects were 32 ± 6 (SD) years old, 181.9 ± 7.2 cm tall, had a body mass (mb) of 85.7 ± 10.6 kg, and 5.5 ± 3.7 years of BJJ training experience. The subjects underwent segmental multifrequency bioelectrical impedance analysis (BIA) of body composition, direct measurements of pulmonary function and maximal oxygen uptake (V[Combining Dot Above]O2max), assessments of one-repetition maximum (1RM) in the parallel squat and paused bench press, and one set of pronated-grip pull-ups to muscular failure...
February 1, 2018: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/29401105/deep-vein-thrombosis-in-a-young-healthy-baseball-catcher-a-case-report-and-review-of-the-literature
#14
Kimberly K Abood, Megan Rose Paul, Dennis John Kuo
Venous thromboembolism is becoming increasingly recognized as a significant cause of morbidity and mortality in the hospitalized pediatric population. However, young healthy athletes can present with unique risk factors for deep vein thrombosis (DVT) that can be overlooked. Here we report a case of an adolescent male with no inherited risk factors or prior history of DVTs who developed a right femoral vein DVT in the context of playing catcher in baseball after recovering from a bout of streptococcal pharyngitis...
February 2, 2018: Journal of Pediatric Hematology/oncology
https://www.readbyqxmd.com/read/29398000/an-instrumental-approach-for-monitoring-physical-exercises-in-a-visual-markerless-scenario-a-proof-of-concept
#15
Marianna Capecci, Maria Gabriella Ceravolo, Francesco Ferracuti, Martina Grugnetti, Sabrina Iarlori, Sauro Longhi, Luca Romeo, Federica Verdini
This work proposes a real-time monitoring tool aimed to support clinicians for remote assessing exercise performances during home-based rehabilitation. The study relies on clinician indications to define kinematic features, that describe five motor tasks (i.e., the lateral tilt of the trunk, lifting of the arms, trunk rotation, pelvis rotation, squatting) usually adopted in the rehabilitation program for axial disorders. These features are extracted by the Kinect v2 skeleton tracking system and elaborated to return disaggregated scores, representing a measure of subjects performance...
January 16, 2018: Journal of Biomechanics
https://www.readbyqxmd.com/read/29397108/knee-medial-and-lateral-contact-forces-in-a-musculoskeletal-model-with-subject-specific-contact-point-trajectories
#16
A Zeighami, R Aissaoui, R Dumas
Contact point (CP) trajectory is a crucial parameter in estimating medial/lateral tibio-femoral contact forces from the musculoskeletal (MSK) models. The objective of the present study was to develop a method to incorporate the subject-specific CP trajectories into the MSK model. Ten healthy subjects performed 45 s treadmill gait trials. The subject-specific CP trajectories were constructed on the tibia and femur as a function of extension-flexion using low-dose bi-plane X-ray images during a quasi-static squat...
January 31, 2018: Journal of Biomechanics
https://www.readbyqxmd.com/read/29389692/optimal-reactive-strength-index-is-it-an-accurate-variable-to-optimize-plyometric-training-effects-on-measures-of-physical-fitness-in-young-soccer-players
#17
Rodrigo Ramirez-Campillo, Cristian Alvarez, Felipe García-Pinillos, Javier Sanchez-Sanchez, Javier Yanci, Daniel Castillo, Irineu Loturco, Helmi Chaabene, Jason Moran, Mikel Izquierdo
This study aimed to compare the effects of drop-jump training using a fixed drop-box height (i.e., 30-cm [FIXED]) versus an optimal drop-box height (i.e, 10-cm to 40-cm: generating an optimal [OPT] reactive strength index [RSI]) in youth soccer players' physical fitness. Athletes were randomly allocated to a control-group (CG: n=24; age=13.7 years), a fixed drop-box height group (FIXED, n=25; age=13.9 years) or an optimal drop-box height group (OPT, n=24; age=13.1 years). Before and after 7 weeks of training, tests for the assessment of jumping (countermovement jump [CMJ], five multiple bounds [MB]), speed (20-m sprint time), change of direction (Illinois change of direction test [CODT]), strength (RSI and 5 maximal squat repetition test [5RM]), endurance (2...
January 30, 2018: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/29387646/assessment-of-patient-functional-performance-in-different-knee-arthroplasty-designs-during-unconstrained-squat
#18
Federica Verdini, Claudio Zara, Tommaso Leo, Alessandro Mengarelli, Stefano Cardarelli, Bernardo Innocenti
Background: In this paper, squat named by Authors unconstrained because performed without constrains related to feet position, speed, knee maximum angle to be reached, was tested as motor task revealing differences in functional performance after knee arthroplasty. It involves large joints ranges of motion, does not compromise joint safety and requires accurate control strategies to maintain balance. Methods: Motion capture techniques were used to study squat on a healthy control group (CTR) and on three groups, each characterised by a specific knee arthroplasty design: a Total Knee Arthroplasty (TKA), a Mobile Bearing and a Fixed Bearing Unicompartmental Knee Arthroplasty (respectively MBUA and FBUA)...
July 2017: Muscles, Ligaments and Tendons Journal
https://www.readbyqxmd.com/read/29387448/association-between-frontal-plane-knee-control-and-lower-extremity-injuries-a-prospective-study-on-young-team-sport-athletes
#19
Anu M Räisänen, Kati Pasanen, Tron Krosshaug, Tommi Vasankari, Pekka Kannus, Ari Heinonen, Urho M Kujala, Janne Avela, Jarmo Perttunen, Jari Parkkari
Background/aim: Poor frontal plane knee control can manifest as increased dynamic knee valgus during athletic tasks. The purpose of this study was to investigate the association between frontal plane knee control and the risk of acute lower extremity injuries. In addition, we wanted to study if the single-leg squat (SLS) test can be used as a screening tool to identify athletes with an increased injury risk. Methods: A total of 306 basketball and floorball players participated in the baseline SLS test and a 12-month injury registration follow-up...
2018: BMJ Open Sport & Exercise Medicine
https://www.readbyqxmd.com/read/29386171/a-wearable-sensor-based-exercise-biofeedback-system-mixed-methods-evaluation-of-formulift
#20
Martin Aidan O'Reilly, Patrick Slevin, Tomas Ward, Brian Caulfield
BACKGROUND: Formulift is a newly developed mobile health (mHealth) app that connects to a single inertial measurement unit (IMU) worn on the left thigh. The IMU captures users' movements as they exercise, and the app analyzes the data to count repetitions in real time and classify users' exercise technique. The app also offers feedback and guidance to users on exercising safely and effectively. OBJECTIVE: The aim of this study was to assess the Formulift system with three different and realistic types of potential users (beginner gym-goers, experienced gym-goers, and qualified strength and conditioning [S&C] coaches) under a number of categories: (1) usability, (2) functionality, (3) the perceived impact of the system, and (4) the subjective quality of the system...
January 31, 2018: JMIR MHealth and UHealth
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