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https://www.readbyqxmd.com/read/29672932/investigation-of-knee-control-as-a-lower-extremity-injury-risk-factor-a-prospective-study-in-youth-football
#1
Anu M Räisänen, Hillevi Arkkila, Tommi Vasankari, Kathrin Steffen, Jari Parkkari, Pekka Kannus, Hannele Forsman, Kati Pasanen
This prospective study in youth football examined the relationship between frontal plane knee projection angle (FPKPA) during the single-leg squat and sustaining an acute lower extremity injury or acute non-contact lower extremity injury. Secondly, side-to-side asymmetry in FPKPA and sex as injury risk factors were explored. In addition, we investigated the influence of age, sex and leg dominance on the FPKPA. A total of 558 youth football players (U11 to U14), participated in the single-leg squat test and prospective injury registration...
April 19, 2018: Scandinavian Journal of Medicine & Science in Sports
https://www.readbyqxmd.com/read/29658150/proximal-patellar-tendon-pathology-can-develop-during-adolescence-in-young-ballet-dancers-a-2-year-longitudinal-study
#2
A Rudavsky, J L Cook, S Docking
PURPOSE: Patellar tendinopathy (tendon pain and dysfunction), or jumper's knee is prevalent in adult jumping athletes. Pathology in the proximal patellar tendon is a key risk factor for developing patellar tendinopathy. When pathology develops in the proximal patellar tendon is not known, though it is reported to exist in adolescent athletes. The aim of this study was to follow young jumping athletes (ballet dancers) through adolescence to identify if pathology develops and its relation to the adolescent growth spurt...
April 15, 2018: Scandinavian Journal of Medicine & Science in Sports
https://www.readbyqxmd.com/read/29599693/functional-analysis-of-lower-limbs-in-individuals-infected-with-the-human-immunodeficiency-virus
#3
Gabriel Pádua da Silva, Bruno Ferreira, Selma Siéssere, Isabela Hallak Regalo, Danilo Stefani Esposto, Camila Roza Gonçalves, Veridiana Wanshi Arnoni, Edson Donizetti Verri, Paulo Batista Vasconcelos, Maria Aparecida Carneiro Vasconcelos, Alcyone Artioli Machado, Simone Cecilio Hallak Regalo
Objectives: The objective of this research was to analyze the functional changes of lower limbs by means of surface electromyography in patients with acquired immunodeficiency syndrome. Methods: A total of 60 men and women (age mean of 36.77 ± 9.33 years) were divided into two groups: 30 individuals with human immunodeficiency virus group (HIVG) Subtype 1 and 30 healthy individuals control group. Muscle activity was evaluated using surface electromyography (sEMG)...
March 2018: International Journal of Health Sciences
https://www.readbyqxmd.com/read/29584533/rehabilitation-exercises-for-the-gluteus-minimus-muscle-segments-an-electromyography-study
#4
Damien Moore, Adam I Semciw, Jodie McClelland, Henry Wajswelner, Tania Pizzari
CONTEXT: The gluteus minimus (GMin) muscle consists of two uniquely oriented segments that have potential for independent function, and have different responses to pathology and ageing. For healthy, young adults it is unknown which rehabilitation exercises specifically target the individual segments. OBJECTIVE: To quantify segmental GMin activity for six common lower limb rehabilitation exercises in healthy young adults, and determine if significant differences exist in segmental activity levels between the exercises...
March 27, 2018: Journal of Sport Rehabilitation
https://www.readbyqxmd.com/read/29581655/effect-of-squatting-velocity-on-hip-muscle-latency-in-women-with-patellofemoral-pain-syndrome
#5
Ignacio Orozco-Chavez, Guillermo Mendez-Rebolledo
[Purpose] Neuromuscular activity has been evaluated in patellofemoral pain syndrome but movement velocity has not been considered. The aim was to determine differences in onset latency of hip and knee muscles between individuals with and without patellofemoral pain syndrome during a single leg squat, and whether any differences are dependent on movement velocity. [Subjects and Methods] Twenty-four females with patellofemoral pain syndrome and 24 healthy females participated. Onset latency of gluteus maximus, anterior and posterior gluteus medius, rectus femoris, vastus medialis, vastus lateralis and biceps femoris during a single leg squat at high and low velocity were evaluated...
March 2018: Journal of Physical Therapy Science
https://www.readbyqxmd.com/read/29573530/knee-extensor-strength-assessed-using-a-vertical-squat-and-a-simple-geometric-model-to-calculate-joint-torque-an-evaluation-of-validity-and-clinical-utility
#6
Haruhiko Sato, Koki Kusayanagi, Yu Kondo, Naoto Kamide, Yoshitaka Shiba, Atsushi Takashima
AIM: We propose a simple method to measure knee extensor muscle strength using a single-legged vertical squat. The purpose of the present study was to assess the validity of this method in comparison with standard methods of measurement. METHODS: A total of 30 healthy adults (mean age 22 years) and 28 healthy older individuals (mean age 69 years) participated in this study. Knee extensor torque at maximum knee flexion during a single-leg squat was calculated by a geometrical model using height, weight and measured leg forward lean angle...
March 24, 2018: Geriatrics & Gerontology International
https://www.readbyqxmd.com/read/29570160/descriptive-profile-of-lumbopelvic-control-in-collegiate-baseball-pitchers
#7
Kevin G Laudner, Regan H Wong, James R Latal, Keith Meister
Laudner, K, Wong, R, Latal, J, and Meister, K. Descriptive profile of lumbopelvic control in collegiate baseball pitchers. J Strength Cond Res 32(4): 1150-1154, 2018-Throwing a baseball requires the transmission of forces generated in the lower extremity, through the trunk, then to the upper extremity, and ultimately out through the ball. Disruptions in this kinetic chain, specifically in lumbopelvic control, have been associated with decreased pitching performance and increased risk of injury. The purpose of this study was to establish normative data of lumbopelvic control among collegiate baseball pitchers...
April 2018: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/29543116/ultrasound-imaging-reveals-gluteal-muscle-changes-during-phases-of-gait-in-healthy-individuals-with-medial-knee-displacement
#8
Alexandra DeJong, L Colby Mangum, Jacob Resch, Susan A Saliba
CONTEXT: Medial knee displacement (MKD) is a common risk factor for lower extremity injury and is related to altered gluteal muscle activity. Ultrasound imaging (USI) is a reliable means to explore mechanical muscle activity, however no information exists regarding USI of the gluteals during gait in a MKD population. OBJECTIVE: To determine differences in USI gluteal muscle activity during gait in individuals with and without MKD. DESIGN: Descriptive laboratory study...
March 15, 2018: Journal of Sport Rehabilitation
https://www.readbyqxmd.com/read/29493398/three-dimensional-assessment-of-squats-and-drop-jumps-using-the-microsoft-xbox-one-kinect-reliability-and-validity
#9
Benjamin F Mentiplay, Ksaniel Hasanki, Luke G Perraton, Yong-Hao Pua, Paula C Charlton, Ross A Clark
The Microsoft Xbox One Kinect™ (Kinect V2) contains a depth camera that can be used to manually identify anatomical landmark positions in three-dimensions independent of the standard skeletal tracking, and therefore has potential for low-cost, time-efficient three-dimensional movement analysis (3DMA). This study examined inter-session reliability and concurrent validity of the Kinect V2 for the assessment of coronal and sagittal plane kinematics for the trunk, hip and knee during single leg squats (SLS) and drop vertical jumps (DVJ)...
March 1, 2018: Journal of Sports Sciences
https://www.readbyqxmd.com/read/29486363/single-leg-squat-ratings-by-clinicians-are-reliable-and-predict-excessive-hip-internal-rotation-moment
#10
Robert M Barker-Davies, Andrew Roberts, Alexander N Bennett, Daniel T P Fong, Patrick Wheeler, Mark P Lewis
BACKGROUND: Single leg squats are commonly used subjective assessments of general biomechanical function, injury risk, as a predictor for recovery and as an outcome measure of rehabilitation. While 3D motion capture is a useful tool for elite sports performance and research it is impractical for routine clinical use. RESEARCH QUESTION: This cross-sectional study aims to: assess reliability and validity of clinicians' subjective ratings of single leg squats compared to 3D motion capture, and to identify whether performance predicts joint moments...
February 21, 2018: Gait & Posture
https://www.readbyqxmd.com/read/29484242/trunk-lean-during-a-single-leg-squat-is-associated-with-trunk-lean-during-pitching
#11
Hillary A Plummer, Gretchen D Oliver, Christopher M Powers, Lori A Michener
Background: Impaired trunk motion during pitching may be a risk factor for upper extremity injuries. Specifically, increased forces about the shoulder and elbow have been observed in pitchers with excessive contralateral trunk lean during pitching. Because of the difficulty in identifying abnormal trunk motions during a high-speed task such as pitching, a clinical screening test is needed to identify pitchers who have impaired trunk motion during pitching. Hypothesis/Purpose: The purpose of this study was to determine the relationship between the degree of lateral trunk lean during the single-leg squat and amount of trunk lean during pitching and if trunk lean during pitching can be predicted from lean during the single-leg squat...
February 2018: International Journal of Sports Physical Therapy
https://www.readbyqxmd.com/read/29387448/association-between-frontal-plane-knee-control-and-lower-extremity-injuries-a-prospective-study-on-young-team-sport-athletes
#12
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
#13
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
https://www.readbyqxmd.com/read/29366559/hip-chondrolabral-mechanics-during-activities-of-daily-living-role-of-the-labrum-and-interstitial-fluid-pressurization
#14
Jocelyn N Todd, Travis G Maak, Gerard A Ateshian, Steve A Maas, Jeffrey A Weiss
Osteoarthritis of the hip can result from mechanical factors, which can be studied using finite element (FE) analysis. FE studies of the hip often assume there is no significant loss of fluid pressurization in the articular cartilage during simulated activities and approximate the material as incompressible and elastic. This study examined the conditions under which interstitial fluid load support remains sustained during physiological motions, as well as the role of the labrum in maintaining fluid load support and the effect of its presence on the solid phase of the surrounding cartilage...
March 1, 2018: Journal of Biomechanics
https://www.readbyqxmd.com/read/29318166/lower-limb-symmetry-comparison-of-muscular-power-between-dominant-and-nondominant-legs-in-healthy-young-adults-associated-with-single-leg-dominant-sports
#15
Alex Vaisman, Rodrigo Guiloff, Juan Rojas, Iris Delgado, David Figueroa, Rafael Calvo
Background: Achieving a symmetrical power performance (difference <15%) between lower limbs is generally recommended during sports rehabilitation. However, athletes in single-leg-dominant sports, such as professional soccer players, could develop significant asymmetry between their dominant and nondominant legs, such that symmetry does not act as a viable comparison. Purpose: To (1) compare maximal muscular power between the dominant and nondominant legs in healthy young adults, (2) evaluate the effect of a single-leg-dominant sport activity performed at the professional level, and (3) propose a parameter of normality for maximal power difference in the lower limbs of this young adult population...
December 2017: Orthopaedic Journal of Sports Medicine
https://www.readbyqxmd.com/read/29284166/functional-screening-tests-interrelationships-and-ability-to-predict-vertical-jump-performance
#16
Irineu Loturco, Lucas Adriano Pereira, Ronaldo Kobal, Cesar Cavinato Cal Abad, William Komatsu, Ronaldo Cunha, Gustavo Arliani, Benno Ejnisman, Alberto de Castro Pochini, Fábio Yuzo Nakamura, Moises Cohen
There are several methods used in sports science to identify asymmetries in athletes, given their purported relevance to injury prevention and performance optimization. We aimed to verify whether asymmetries provided by isokinetic assessments, jump tests, and tensiomyography (TMG) are associated with each other, and whether their respective functional indices are related to jumping ability. TMG parameters, unilateral and bilateral squat-jump (SJ) and countermovement-jump (CMJ) performances, and peak torque in knee-extension and flexion with angular velocities of 60o /s and 300o /s for twenty-four soccer players were retained for analyses...
February 2018: International Journal of Sports Medicine
https://www.readbyqxmd.com/read/29238596/limb-symmetry-during-double-leg-squats-and-single-leg-squats-on-land-and-in-water-in-adults-with-long-standing-unilateral-anterior-knee-pain-a-cross-sectional-study
#17
Anna C Severin, Brendan J Burkett, Mark R McKean, Aaron N Wiegand, Mark G L Sayers
Background: The presence of pain during movement typically results in changes in technique. However, the physical properties of water, such as flotation, means that water-based exercise may not only reduce compensatory movement patterns but also allow pain sufferers to complete exercises that they are unable to perform on land. The purpose of this study was to assess bilateral kinematics during double-leg squats and single-leg squats on land and in water in individuals with unilateral anterior knee pain...
2017: BMC Sports Science, Medicine and Rehabilitation
https://www.readbyqxmd.com/read/29210775/isometric-exercise-to-reduce-pain-in-patellar-tendinopathy-in-season-is-it-effective-on-the-road
#18
Ebonie Rio, Craig Purdam, Michael Girdwood, Jill Cook
OBJECTIVE: To investigate the effectiveness of an isometric squat exercise using a portable belt, on patellar tendon pain and function, in athletes during their competitive season. DESIGN: Case series with no requirements to change any aspect of games or training. The object of this pragmatic study was to investigate this intervention in addition to "usual management." A control or sham intervention was considered unacceptable to teams. SETTING: In-season...
November 27, 2017: Clinical Journal of Sport Medicine: Official Journal of the Canadian Academy of Sport Medicine
https://www.readbyqxmd.com/read/29204327/automated-assessment-of-dynamic-knee-valgus-and-risk-of-knee-injury-during-the-single-leg-squat
#19
Rezvan Kianifar, Alexander Lee, Sachin Raina, Dana Kulic
Many clinical assessment protocols of the lower limb rely on the evaluation of functional movement tests such as the single leg squat (SLS), which are often assessed visually. Visual assessment is subjective and depends on the experience of the clinician. In this paper, an inertial measurement unit (IMU)-based method for automated assessment of squat quality is proposed to provide clinicians with a quantitative measure of SLS performance. A set of three IMUs was used to estimate the joint angles, velocities, and accelerations of the squatting leg...
2017: IEEE Journal of Translational Engineering in Health and Medicine
https://www.readbyqxmd.com/read/29188333/dynamically-tensioned-acl-functional-knee-braces-reduce-acl-and-meniscal-strain
#20
Sebastian Tomescu, Ryan Bakker, David Wasserstein, Mayank Kalra, Micah Nicholls, Cari Whyne, Naveen Chandrashekar
PURPOSE: The effectiveness of ACL functional knee braces to reduce meniscal and ACL strain after ACL injury or reconstruction is not well understood. A new dynamic knee tensioning brace system has been designed to apply an active stabilizing force to the knee. The ability of this system to reduce tissue strains is unknown. The purpose of this study was to test the ability of the dynamically tensioned brace to reduce strain in both the ACL and meniscus during rehabilitation activities...
February 2018: Knee Surgery, Sports Traumatology, Arthroscopy: Official Journal of the ESSKA
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