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https://www.readbyqxmd.com/read/28714764/abdominal-hollowing-reduces-lateral-trunk-displacement-during-single-leg-squats-in-healthy-females-but-does-not-affect-peak-hip-abduction-angle-or-knee-abductio-angle-moment
#1
Lukas D Linde, Jessica Archibald, Eve C Lampert, John Z Srbely
CONTEXT: Females suffer 4-6 times more non-contact anterior cruciate ligament (ACL) injuries than males due to neuromuscular control deficits of the hip musculature leading to increases in hip adduction angle, knee abduction angle, and knee abduction moment during dynamic tasks such as single-leg squats. Lateral trunk displacement has been further related to ACL injury risk in females, leading to the incorporation of core strength/stability exercises in ACL preventative training programs...
July 17, 2017: Journal of Sport Rehabilitation
https://www.readbyqxmd.com/read/28714757/comparative-effects-of-four-single-leg-squat-exercises-in-subjects-with-gluteus-medius-weakness
#2
Hae-Rim Han, Chung-Hwi Yi, Sung-Hyun You, Heon-Seock Cynn, One-Bin Lim, Jae-Ik Son
CONTEXT: Of the weight bearing exercises, single leg squat (SLS) represents one of the most commonly used hip strengthening exercises that require more gluteus medius (GMED) activity. To date, no studies have investigated how the four SLS exercises affects muscle imbalance of GMED, tensor fasciae latae (TFL), and adductor longus (AL), and kinematics of hip. OBJECTIVE: To investigate the hip muscle activities, onset time, and kinematics during four different SLS exercises (unilateral squat, unilateral wall-squat, lateral step-down, and front step-down) in subjects with GMED weakness...
July 17, 2017: Journal of Sport Rehabilitation
https://www.readbyqxmd.com/read/28709418/single-leg-squat-performance-in-physically-and-non-physically-active-individuals-a-cross-sectional-study
#3
Silvia Gianola, Greta Castellini, Elena Stucovitz, Alice Nardo, Giuseppe Banfi
BACKGROUND: Single-leg squat (SLS) is a functional test visually rated by clinicians for assessing lower limb function as a preventive injury strategy. SLS clinical rating is a qualitative evaluation and it does not count objective outcomes as kinematics data and surface electromyography (sEMG) assessment. Based on the SLS rating, the aims of this study were (i) to determine the clinical rating agreement among six raters and (ii) to assess kinematic and sEMG predictors of good SLS performance in physically and non-physically active individuals...
July 14, 2017: BMC Musculoskeletal Disorders
https://www.readbyqxmd.com/read/28662531/effects-of-in-season-explosive-strength-training-on-maximal-leg-strength-jumping-sprinting-and%C3%A2-intermittent-aerobic-performance-in-male-handball-athletes
#4
Souhail Hermassi, Mohamed Souhaiel Chelly, Georg Fieseler, Thomas Bartels, Stephan Schulze, Karl-Stefan Delank, Roy J Shephard, René Schwesig
Background Team handball is an intense ball sport with specific requirements on technical skills, tactical understanding, and physical performance. The ability of handball players to develop explosive efforts (e. g. sprinting, jumping, changing direction) is crucial to success. Objective The purpose of this pilot study was to examine the effects of an in-season high-intensity strength training program on the physical performance of elite handball players. Materials and methods Twenty-two handball players (a single national-level Tunisian team) were randomly assigned to a control group (CG; n = 10) or a training group (TG; n = 12)...
June 29, 2017: Sportverletzung Sportschaden: Organ der Gesellschaft Für Orthopädisch-Traumatologische Sportmedizin
https://www.readbyqxmd.com/read/28654438/differences-in-athletic-performance-between-sportsmen-with-symptomatic-femoroacetabular-impingement-and-healthy-controls
#5
Karen Mullins, Michael Hanlon, Patrick Carton
OBJECTIVE: Femoroacetabular impingement (FAI) is a commonly recognized condition in athletes characterized by activity-related hip pain and stiffness, which if left untreated can progress to hip osteoarthritis. The aim of the study was to determine the effect of symptomatic FAI on performance in young athletes based on the hypothesis that athletes with FAI would show deficits in performance compared with healthy controls. DESIGN: The functional performance of a cohort of preoperative, competitive sportsmen with symptomatic FAI (FAI group, n = 54), was compared with that of a group of age, sex and activity-level matched controls (n = 66)...
June 22, 2017: Clinical Journal of Sport Medicine: Official Journal of the Canadian Academy of Sport Medicine
https://www.readbyqxmd.com/read/28653966/reliability-and-practicality-of-the-core-score-four-dynamic-core-stability-tests-performed-in-a-physician-office-setting
#6
Jason Friedrich, Rachel Brakke, Venu Akuthota, William Sullivan
OBJECTIVE: Pilot study to determine the practicality and inter-rater reliability of the "Core Score," a composite measure of 4 clinical core stability tests. DESIGN: Repeated measures. SETTING: Academic hospital physician clinic. PARTICIPANTS: 23 healthy volunteers with mean age of 32 years (12 females, 11 males). ASSESSMENT OF VARIABLES: All subjects performed 4 core stability maneuvers under direct observation from 3 independent physicians in sequence...
July 2017: Clinical Journal of Sport Medicine: Official Journal of the Canadian Academy of Sport Medicine
https://www.readbyqxmd.com/read/28628370/multiple-joint-exercises-using-elastic-resistance-bands-vs-conventional-resistance-training-equipment-a-cross-over-study
#7
Vegard M Iversen, Paul Jarle Mork, Ottar Vasseljen, Ronny Bergquist, Marius S Fimland
Previous studies indicate that elastic resistance bands (ERB) can be a viable option to conventional resistance-training equipment (CRE) during single-joint resistance exercises, but their efficacy has not been established for several commonly used multiple-joint resistance exercises. Thus, we compared muscular activation levels in four popular multiple-joint exercises performed with ERB (TheraBand(®)) vs. CRE (Olympic barbell or cable pulley machines). In a cross-over design, men and women (n = 29) performed squats, stiff-legged deadlifts, unilateral rows and lateral pulldown using both modalities...
June 19, 2017: European Journal of Sport Science
https://www.readbyqxmd.com/read/28566815/training-induced-changes-in-physical-performance-can-be-achieved-without-body-mass-reduction-after-eight-week-of-strength-and-injury-prevention-oriented-programme-in-volleyball-female-players
#8
M Lehnert, M Sigmund, P Lipinska, R Vařeková, M Hroch, Z Xaverová, P Stastny, P Háp, P Zmijewski
The purpose of the study was to analyse the changes in muscle strength, power, and somatic parameters in elite volleyball players after a specific pre-season training programme aimed at improving jumping and strength performance and injury prevention. Twelve junior female volleyball players participated in an 8-week training programme. Anthropometric characteristics, isokinetic peak torque (PT) single-joint knee flexion (H) and extension (Q) at 60º/s and 180º/s, counter movement jump (CMJ), squat jump (SJ), and reactive strength index (RSI) were measured before and after intervention...
June 2017: Biology of Sport
https://www.readbyqxmd.com/read/28538326/technology-in-strength-and-conditioning-tracking-lower-limb-exercises-with-wearable-sensors
#9
Martin A OʼReilly, Darragh F Whelan, Tomas E Ward, Eamonn Delahunt, Brian Caulfield
Strength and conditioning (S&C) coaches offer expert guidance to help those they work with achieve their personal fitness goals. However, because of cost and availability issues, individuals are often left training without expert supervision. Recent developments in inertial measurement units (IMUs) and mobile computing platforms have allowed for the possibility of unobtrusive motion tracking systems and the provision of real-time individualized feedback regarding exercise performance. These systems could enable S&C coaches to remotely monitor sessions and help gym users record workouts...
June 2017: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/28515971/prediction-of-functional-movement-screen%C3%A2-performance-from-lower-extremity-range-of-motion-and-core-tests
#10
Nicole J Chimera, Shelby Knoeller, Ron Cooper, Nicholas Kothe, Craig Smith, Meghan Warren
BACKGROUND: There are varied reports in the literature regarding the association of the Functional Movement Screen™ (FMS™) with injury. The FMS™ has been correlated with hamstring range of motion and plank hold times; however, limited research is available on the predictability of lower extremity range of motion (ROM) and core function on FMS™ performance. PURPOSE/HYPOTHESES: The purpose of this study was to examine whether active lower extremity ROM measurements and core functional tests predict FMS™ performance...
April 2017: International Journal of Sports Physical Therapy
https://www.readbyqxmd.com/read/28515970/two-dimensional-video-analysis-is-comparable-to-3d-motion-capture-in-lower-extremity-movement-assessment
#11
Stacy A Schurr, Ashley N Marshall, Jacob E Resch, Susan A Saliba
BACKGROUND: Although 3D motion capture is considered the "gold standard" for recording and analyzing kinematics, 2D video analysis may be a more reasonable, inexpensive, and portable option for kinematic assessment during pre-participation screenings. Few studies have compared quantitative measurements of lower extremity functional tasks between 2D and 3D. PURPOSE: To compare kinematic measurements of the trunk and lower extremity in the frontal and sagittal planes between 2D video camera and 3D motion capture analyses obtained concurrently during a SLS...
April 2017: International Journal of Sports Physical Therapy
https://www.readbyqxmd.com/read/28473614/lower-limb-explosive-strength-capacity-in-elderly-women-effects-of-resistance-training-and-healthy-diet
#12
Peter Edholm, Emelie Strandberg, Fawzi Kadi
The effects of 24-weeks of resistance training combined with a healthy diet on lower limb explosive strength capacity were investigated in a population of healthy elderly women. Participants (n=63; 67.5 ± 0.4 yrs) were randomized into three groups; resistance training (RT), resistance training and healthy diet (RT-HD) and control (CON). Progressive resistance training was performed at a load of 75%-85% 1 RM. A major adjustment in the healthy dietary approach was an n-6/n-3 PUFA ratio below 2. Lower limb maximal strength, explosive force capacity during dynamic and isometric movements, whole body lean mass and physical function were assessed...
May 4, 2017: Journal of Applied Physiology
https://www.readbyqxmd.com/read/28471700/relationship-between-the-practice-of-physical-activity-and-quality-of-movement-in-adolescents-a-screening-tool-using-self-organizing-maps
#13
María Herrero-Herrero, Xavier García-Massó, Carlos Martínez-Corralo, Josep Prades-Piñón, Vicente Sanchis-Alfonso
OBJECTIVES: The aim of this study was to determine whether the most physically active adolescents have better lower limb control. METHODS: 31 high school students (12 males and 19 females) participated in this study. The Anterior Knee Pain Scale was used to find any cases of knee pain. Only subjects with high scores were selected, to exclude those with knee pain or lower limb injuries. Single Leg Squat and Tuck Jump Assessment were used to evaluate movements with two cameras in a two-dimensional assessment...
May 12, 2017: Physician and Sportsmedicine
https://www.readbyqxmd.com/read/28437781/the-reliability-and-criterion-validity-of-2d-video-assessment-of-single-leg-squat-and-hop-landing
#14
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...
June 2017: Journal of Electromyography and Kinesiology
https://www.readbyqxmd.com/read/28426516/physical-profiles-of-female-academy-netball-players-by-position
#15
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
#16
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
#17
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/acute-responses-of-strength-and-running-mechanics-to-increasing-and-decreasing-pain-in-patients-with-patellofemoral-pain
#18
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...
May 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
#19
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...
May 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
#20
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
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