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https://www.readbyqxmd.com/read/28437781/the-reliability-and-criterion-validity-of-2d-video-assessment-of-single-leg-squat-and-hop-landing
#1
Lee Herrington, Faisal Alenezi, Msaad Alzhrani, Hasan Alrayani, Richard Jones
The objective was to assess the intra-tester, within and between day reliability of measurement of hip adduction (HADD) and frontal plane projection angles (FPPA) during single leg squat (SLS) and single leg landing (SLL) using 2D video and the validity of these measurements against those found during 3D motion capture. 15 healthy subjects had their SLS and SLL assessed using 3D motion capture and video analysis. Inter-tester reliability for both SLS and SLL when measuring FPPA and HADD show excellent correlations (ICC2,1 0...
April 17, 2017: Journal of Electromyography and Kinesiology
https://www.readbyqxmd.com/read/28426516/physical-profiles-of-female-academy-netball-players-by-position
#2
Christopher Thomas, Kemal Thomas Ismail, Robert Simpson, Paul Comfort, Paul A Jones, Thomas Dos'Santos
The purpose of this study was to evaluate the height, body mass and physical characteristics of female academy netball players by position (centers, defenders and shooters). Data were collected on 43 regional academy players during the preseason period and comprised of height and body mass, and physical characteristics (single-leg hop [SLH], squat jump [SJ], countermovement jump [CMJ], 5- and 10-m sprint, 505 and cardiorespiratory fitness). Defenders and shooters demonstrated significantly (p = < 0.05; d ≥ 1...
April 15, 2017: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/28420999/functional-high-intensity-circuit-training-improves-body-composition-peak-oxygen-uptake-strength-and-alters-certain-dimensions-of-quality-of-life-in-overweight-women
#3
Billy Sperlich, Birgit Wallmann-Sperlich, Christoph Zinner, Valerie Von Stauffenberg, Helena Losert, Hans-Christer Holmberg
The effects of circuit-like functional high-intensity training (CircuitHIIT) alone or in combination with high-volume low-intensity exercise (Circuitcombined) on selected cardio-respiratory and metabolic parameters, body composition, functional strength and the quality of life of overweight women were compared. In this single-center, two-armed randomized, controlled study, overweight women performed 9-weeks (3 sessions·wk(-1)) of either CircuitHIIT (n = 11), or Circuitcombined (n = 8). Peak oxygen uptake and perception of physical pain were increased to a greater extent (p < 0...
2017: Frontiers in Physiology
https://www.readbyqxmd.com/read/28406356/the-association-between-fundamental-athletic-movements-and-physical-fitness-in-elite-junior-australian-footballers
#4
Carl T Woods, Ian McKeown, Justin Keogh, Sam Robertson
This study investigated the associations between fundamental athletic movement and physical fitness in junior Australian football (AF). Forty-four under 18 players performed a fundamental athletic movement assessment consisting of an overhead squat, double lunge, single leg Romanian deadlift and a push up. Movements were scored on three assessment criterions using a three-point scale. Additionally, participants performed five physical fitness tests commonly used for talent identification in AF. A Spearman's nonparametric correlation matrix was built, with correlation coefficients being visualised using a circularly rendered correlogram...
April 13, 2017: Journal of Sports Sciences
https://www.readbyqxmd.com/read/28388232/increasing-and-decreasing-pain-causes-acute-responses-of-strength-and-running-mechanics-in-patellofemoral-pain
#5
David M Bazett-Jones, Wendy Huddleston, Stephen Cobb, Kristian O'Connor, Jennifer E Earl-Boehm
CONTEXT:   Patellofemoral pain (PFP) is typically exacerbated by repetitive activities that load the patellofemoral joint, such as running. Understanding the mediating effects of changes in pain in individuals with PFP might inform injury progression, rehabilitation, or both. OBJECTIVE:   To investigate the effects of changing pain on muscular strength and running biomechanics in those with PFP. DESIGN:   Crossover study. SETTING:   University research laboratory...
April 7, 2017: Journal of Athletic Training
https://www.readbyqxmd.com/read/28353085/alterations-in-mechanical-properties-of-the-patellar-tendon-is-associated-with-pain-in-athletes-with-patellar-tendinopathy
#6
W C Lee, Z J Zhang, L Masci, G Y F Ng, Siu Ngor Fu
PURPOSE: To compare tendon strain and stiffness between athletes with patellar tendinopathy and healthy controls, and explore whether the intensity of pain and dysfunction were related to the mechanical properties of the tendon. METHODS: Thirty-four male athletes with patellar tendinopathy and 13 healthy controls matched by age and activity levels were recruited. The in vivo mechanical properties of the patellar tendon were examined by ultrasonography and dynamometry...
March 28, 2017: European Journal of Applied Physiology
https://www.readbyqxmd.com/read/28290757/hip-musculoskeletal-conditions-and-associated-factors-that-influence-squat-performance-a-systematic-review
#7
Scott W Cheatham, Kyle R Stull, Mike Fantigrassi, Ian Montel
CONTEXT: The squat is a fundamental movement for weight lifting and sports performance. Both unilateral and bilateral squats are also used to assess transitional and dynamic lower extremity control. Common lower extremity conditions can have an influence on squat performance. Of interest, are the effects of hip musculoskeletal conditions and associated factors such as hip muscle pain, fatigue, and tightness on squat performance. Currently, there has been no appraisal of the evidence regarding the association of these conditions and associated factors on squat performance...
March 14, 2017: Journal of Sport Rehabilitation
https://www.readbyqxmd.com/read/28269683/classification-of-squat-quality-with-inertial-measurement-units-in-the-single-leg-squat-mobility-test
#8
Rezvan Kianifar, Alex Lee, Sachin Raina, Dana Kulic
Many assessment and diagnosis protocols in rehabilitation, orthopedic surgery and sports medicine rely on mobility tests like the Single Leg Squat (SLS). In this study, a set of three Inertial Measurement Units (IMUs) were used to estimate the joint pose during SLS and to classify the SLS as poor, moderate or good. An Extended Kalman Filter pose estimation method was used to estimate kinematic joint variables, and time domain features were generated based on these variables. The most important features were then selected and used to train Support Vector Machine (SVM), Linear Multinomial Logistic Regression, and Decision Tree classifiers...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28227944/classification-of-squat-quality-with-inertial-measurement-units-in-the-single-leg-squat-mobility-test
#9
Rezvan Kianifar, Alex Lee, Sachin Raina, Dana Kulic, Rezvan Kianifar, Alex Lee, Sachin Raina, Dana Kulic, Alex Lee, Sachin Raina, Dana Kulic, Rezvan Kianifar
Many assessment and diagnosis protocols in rehabilitation, orthopedic surgery and sports medicine rely on mobility tests like the Single Leg Squat (SLS). In this study, a set of three Inertial Measurement Units (IMUs) were used to estimate the joint pose during SLS and to classify the SLS as poor, moderate or good. An Extended Kalman Filter pose estimation method was used to estimate kinematic joint variables, and time domain features were generated based on these variables. The most important features were then selected and used to train Support Vector Machine (SVM), Linear Multinomial Logistic Regression, and Decision Tree classifiers...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28217412/exercises-that-facilitate-optimal-hamstring-and-quadriceps-co-activation-to-help-decrease-acl-injury-risk-in-healthy-females-a-systematic-review-of-the-literature
#10
Rachel Dedinsky, Lindsey Baker, Samuel Imbus, Melissa Bowman, Leigh Murray
BACKGROUND: Anterior cruciate ligament (ACL) injury is common among females due to many anatomic, hormonal, and neuromuscular risk factors. One modifiable risk factor that places females at increased risk of ACL injury is a poor hamstrings: quadriceps (H:Q) co-activation ratio, which should be 0.6 or greater in order to decrease the stress placed on the ACL. Exercises that produce more quadriceps dominant muscle activation can add to the tension placed upon the ACL, potentially increasing the risk of ACL injury...
February 2017: International Journal of Sports Physical Therapy
https://www.readbyqxmd.com/read/28161188/hip-muscle-strength-is-decreased-in-middle-aged-recreational-male-athletes-with-midportion-achilles-tendinopathy-a-cross-sectional-study
#11
B Habets, H W Smits, F J G Backx, R E H van Cingel, B M A Huisstede
OBJECTIVE: Investigating differences in hip muscle strength between athletes with Achilles tendinopathy (AT) and asymptomatic controls. DESIGN: Cross-sectional case-control study. SETTING: Sports medical center. PARTICIPANTS: Twelve recreational male athletes with mid-portion AT and twelve matched asymptomatic controls. OUTCOME MEASURES: Isometric strength of the hip abductors, external rotators, and extensors was measured using a handheld dynamometer...
September 13, 2016: Physical Therapy in Sport
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
#12
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/28040656/squat-test-performance-and-execution-in-children-with-and-without-cerebral-palsy
#13
M M Eken, J Harlaar, A J Dallmeijer, E de Waard, C A M van Bennekom, H Houdijk
BACKGROUND: Knowledge on lower extremity strength is imperative to informed decision making for children with cerebral palsy (CP) with mobility problems. However, a functional and clinically feasible test is not available. We aimed to determine whether the squat test is suitable for this purpose by investigating test performance and execution in children with cerebral palsy and typically developing (TD) peers. METHODS: Squat test performance, defined by the number of two-legged squats until fatigue (max 20), was assessed in twenty children with bilateral CP (6-19years; gross motor function classification system I-III) and sixteen TD children (7-16years)...
January 2017: Clinical Biomechanics
https://www.readbyqxmd.com/read/27984498/the-biomechanical-demands-on-the-hip-during-progressive-stepping-tasks
#14
Gillian L Hatfield, Jesse M Charlton, Christopher K Cochrane, Connor Hammond, Chris Napier, Judit Takacs, Natasha M Krowchuk, Michael A Hunt
Functional hip strengthening exercises are important components of lower extremity rehabilitation, and include single leg squats, step-downs, and step-ups. The biomechanical demand of these tasks is unclear. This repeated-measures study determined hip biomechanical demands in a healthy population. Twenty individuals (10 male, 26.6 +/- 5.1 years, 22.1 +/- 2.3 kg/m) participated. Three-dimensional motion, ground reaction force data, and surface electromyograms were recorded during four randomly-ordered tasks...
November 29, 2016: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/27908459/three-single-leg-standing-tests-for-clinical-assessment-of-chronic-plantar-heel-pain-syndrome-static-stance-half-squat-and-heel-rise
#15
B Saban, Y Masharawi
OBJECTIVE: To assess reliability and validity of three single leg standing clinical tests in patients with plantar heel pain syndrome (PHPS). DESIGN: Cross-sectional reliability study. PARTICIPANTS: Forty patients diagnosed with PHPS. MAIN OUTCOME MEASURES: Patients stood on their affected foot in a static stance for up to 30seconds, a half squat for up to 10 repetitions, and a heel rise for up to 10 repetitions. The first sensation of pain (p1) determined the termination of each test, and established a positive test result...
June 29, 2016: Physiotherapy
https://www.readbyqxmd.com/read/27895518/single-leg-squats-can-predict-leg-alignment-in-dancers-performing-ballet-movements-in-turnout
#16
Luke S Hopper, Nahoko Sato, Andries L Weidemann
The physical assessments used in dance injury surveillance programs are often adapted from the sports and exercise domain. Bespoke physical assessments may be required for dance, particularly when ballet movements involve "turning out" or external rotation of the legs beyond that typically used in sports. This study evaluated the ability of the traditional single-leg squat to predict the leg alignment of dancers performing ballet movements with turnout. Three-dimensional kinematic data of dancers performing the single-leg squat and five ballet movements were recorded and analyzed...
2016: Open Access Journal of Sports Medicine
https://www.readbyqxmd.com/read/27871019/comparison-of-lower-limb-and-trunk-kinematics-between-markerless-and-marker-based-motion-capture-systems
#17
Margaret A Perrott, Tania Pizzari, Jill Cook, Jodie A McClelland
Three dimensional (3-D) motion capture systems are used by researchers and clinicians to analyze the kinematics of human movement. Traditional marker based systems are time consuming and limit the size of studies. Markerless 3-D systems are quicker to use but the differences between data captured in each system is unclear. AIM: To examine the relationship of kinematic data captured by marker based and markerless motion capture systems. METHODS: Movement was assessed in two tests: a simple knee flexion test and single leg squat with a marker based protocol (Vicon) and a markerless protocol (Organic Motion)...
October 31, 2016: Gait & Posture
https://www.readbyqxmd.com/read/27820725/training-strategies-to-improve-muscle-power-is-olympic-style-weightlifting-relevant
#18
Christian Helland, Eirik Hole, Erik Iversen, Monica Charlotte Olsson, Olivier Seynnes, Paul Andre Solberg, Gøran Paulsen
INTRODUCTION: This efficacy study investigated the effects of 1) Olympic-style weightlifting (OWL), 2) motorized strength and power training (MSPT), and 3) free weight strength and power training (FSPT) on muscle power. METHODS: Thirty-nine young athletes (20 ± 3 yr; ice hockey, volleyball, and badminton) were randomized into the three training groups. All groups participated in two to three sessions per week for 8 wk. The MSPT and FSPT groups trained using squats (two legs and single leg) with high force and high power, whereas the OWL group trained using clean and snatch exercises...
April 2017: Medicine and Science in Sports and Exercise
https://www.readbyqxmd.com/read/27814851/does-leg-predomination-affect-the-measurement-of-vasti-muscle-activity-during-single-leg-squatting-a-reliability-study
#19
Javid Mostamand, Dan L Bader, Zoë Hudson
INTRODUCTION: Although measuring vasti muscle activity may reveal whether pain relief is associated with altering this parameter during functional activities in subjects with patellofemoral pain syndrome (PFPS), it may be necessary to determine whether the inherent properties of the dominant leg influences the reliability of measuring VMO/VL amplitude. The aim of the present study was to examine the effect of leg predomination on reliability testing of the VMO/VL amplitude measurement during single leg squatting in healthy subjects...
October 2016: Journal of Bodywork and Movement Therapies
https://www.readbyqxmd.com/read/27803635/discriminating-talent-identified-junior-australian-footballers-using-a-fundamental-gross-athletic-movement-assessment
#20
Carl T Woods, Harry G Banyard, Ian McKeown, Job Fransen, Sam Robertson
Talent identification (TID) is a pertinent component of the sports sciences, affording practitioners the opportunity to target developmental interventions to a select few; optimising financial investments. However, TID is multi-componential, requiring the recognition of immediate and prospective performance. The measurement of athletic movement skill may afford practitioners insight into the latter component given its augmented relationship with functional sport specific qualities. It is currently unknown whether athletic movement skill is a discriminant quality in junior Australian football (AF)...
September 2016: Journal of Sports Science & Medicine
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