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https://www.readbyqxmd.com/read/28640774/the-difference-between-countermovement-and-squat-jump-performances-a-review-of-underlying-mechanisms-with-practical-applications
#1
Bas Van Hooren, Julia Zolotarjova
Van Hooren, B and Zolotarjova, J. The difference between countermovement and squat jump performances: a review of underlying mechanisms with practical applications. J Strength Cond Res 31(7): 2011-2020, 2017-Two movements that are widely used to monitor athletic performance are the countermovement jump (CMJ) and squat jump (SJ). Countermovement jump performance is almost always better than SJ performance, and the difference in performance is thought to reflect an effective utilization of the stretch-shortening cycle...
July 2017: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/28636435/effects-of-a-contrast-training-programme-on-jumping-sprinting-and-agility-performance-of-prepubertal-basketball-players
#2
Pedro Ángel Latorre Román, Francisco Javier Villar Macias, Felipe García Pinillos
The purpose of this study was to examine the effects of a 10 week contrast training (CT) programme (isometric + plyometric) on jumping, sprinting abilities and agility performance in prepubertal basketball players. Fifty-eight children from a basketball academy (age: 8.72 ± 0.97 years; body mass index: 17.22 ± 2.48 kg/m(2)) successfully completed the study. Participants were randomly assigned to experimental groups (EG, n = 30) and control groups (CG, n = 28). The CT programme was included in the experimental group's training sessions - twice a week - as part of their usual weekly training regime...
June 21, 2017: Journal of Sports Sciences
https://www.readbyqxmd.com/read/28631257/the-validity-and-responsiveness-of-isometric-lower-body-multi-joint-tests-of-muscular-strength-a-systematic-review
#3
REVIEW
David Drake, Rodney Kennedy, Eric Wallace
BACKGROUND: Researchers and practitioners working in sports medicine and science require valid tests to determine the effectiveness of interventions and enhance understanding of mechanisms underpinning adaptation. Such decision making is influenced by the supportive evidence describing the validity of tests within current research. The objective of this study is to review the validity of lower body isometric multi-joint tests ability to assess muscular strength and determine the current level of supporting evidence...
December 2017: Sports Medicine—Open
https://www.readbyqxmd.com/read/28628370/multiple-joint-exercises-using-elastic-resistance-bands-vs-conventional-resistance-training-equipment-a-cross-over-study
#4
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/28612890/technology-in-rehabilitation-comparing-personalised-and-global-classification-methodologies-in-evaluating-the-squat-exercise-with-wearable-imus
#5
Martin A O'Reilly, Darragh Whelan, Tomás E Ward, Eamonn Delahunt, Brian Caulfield
BACKGROUND: The barbell squat is a popularly used lower limb rehabilitation exercise. It is also an integral exercise in injury risk screening protocols. To date athlete/patient technique has been assessed using expensive laboratory equipment or subjective clinical judgement; both of which are not without shortcomings. Inertial measurement units (IMUs) may offer a low cost solution for the objective evaluation of athlete/patient technique. However, it is not yet known if global classification techniques are effective in identifying naturally occurring, minor deviations in barbell squat technique...
June 14, 2017: Methods of Information in Medicine
https://www.readbyqxmd.com/read/28610215/three-new-species-of-squat-lobsters-of-the-genus-i-fennerogalathea-i-baba-%C3%A2-1988-decapoda-galatheidae-from-the-pacific-ocean
#6
Paula C Rodriguez-Flores, Annie Machordom, Enrique Macpherson
The genus Fennerogalathea Baba, 1988 was known to contain two species: F. chacei Baba, 1988, the type species, from the Philippines, Taiwan and Indonesia and F. chirostyloides Tirmizi & Javed, 1993 from the Bay of Bengal. In the present study, three new species of the genus are described and illustrated: F. chani n. sp. from Papua New Guinea, F. cultrata n. sp. from New Caledonia and Vanuatu and F. ensifera n. sp. from Fiji. The new species are morphologically distinguishable on the basis of the shape and spination of the rostrum and the presence/absence of a small spine on the frontal margin of the carapace...
June 9, 2017: Zootaxa
https://www.readbyqxmd.com/read/28602106/a-comparison-of-performance-on-the-keitel-functional-test-by-persons-with-systemic-sclerosis-and-rheumatoid-arthritis
#7
Janet L Poole, Amy New, Christina Garcia
PURPOSE: The purpose of this study is to compare lower extremity impairments in persons with systemic sclerosis, rheumatoid arthritis, and healthy controls. METHODS: The participants were a convenience sample of 64 persons with systemic sclerosis, 58 persons with rheumatoid arthritis, and 30 healthy controls. The Keitel Functional Test was used to assess lower extremity joint motion and strength. Demographic information on age, disease duration, employment, and perceived overall health was also collected...
June 11, 2017: Disability and Rehabilitation
https://www.readbyqxmd.com/read/28598797/physical-fitness-and-obesity-levels-during-an-academic-year-followed-by-summer-holidays-an-issue-of-insufficient-time-for-physical-activity
#8
George Aphamis, Yiannakis Ioannou, Christoforos D Giannaki
Today, available time for physical activity has been continuously decreasing, whilst, school-time physical education (PE) classes appear to be the only real option for many adolescents to engage in physical activity and exercise. The aim of the present study was to investigate fitness and health related parameters over one academic year, and after the summer holidays for adolescents who do not engage in out-of-school physical activities. Participants were 153 students (age: 15-17 years; boys n = 86) who exercised only during PE (2 × 45-min periods per week)...
June 9, 2017: International Journal of Adolescent Medicine and Health
https://www.readbyqxmd.com/read/28597614/the-effects-of-two-different-explosive-strength-training-programs-on-vertical-jump-performance-in-basketball
#9
Simone Ciacci, Sandro Bartolomei
BACKGROUND: The aim of this study was to compare the effects of two different training programs oriented to improve vertical jump performance and leg stiffness in basketball players. METHODS: Fifty-eight male basketball players were involved, divided into three age groups (Senior, U19 and U17). Subsequently, within any age group, the players were randomly divided into two training groups, respectively performing a 16-week "hang-clean" training program (HCL), and a "half-squat" training program (HSQ), lasting for the same duration...
June 8, 2017: Journal of Sports Medicine and Physical Fitness
https://www.readbyqxmd.com/read/28595238/distinguishing-playing-status-through-a-functionally-relevant-performance-measure-in-female-division-i-collegiate-soccer-athletes
#10
Mitchel A Magrini, Ryan J Colquhoun, John H Sellers, Eric C Conchola, Garrett M Hester, Ryan M Thiele, Zach K Pope, Doug B Smith
Although soccer is predominately an endurance sport, high velocity movements may be an important indicator of athletic success. The purpose of this investigation was to establish whether squat jumps (SJ) can differentiate starters from non-starters with a female collegiate division I soccer team. Eighteen female division I soccer athletes were separated into two groups: 9 starters (age: 19.5 ± 1.0; mass = 64.8 ± 11.5 kg; height = 167.5 ± 7.7 cm; games started = 18.2 ± 4.7; minutes played = 1633.8 ± 478...
June 8, 2017: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/28595237/a-comparison-of-muscle-activation-between-back-squats-and-belt-squats
#11
Thomas W Evans, Cherilyn N McLester, Jonathan H Howard, John R McLester, Jimmy P Calloway
A machine belt squat is a piece of equipment designed to allow the performance of squats while loading weight on the lifter's hips using a belt. The purpose of this investigation was to determine if belt squats differ from back squats in activation of the primary movers, and to determine the predictive capabilities of back squat load, training status, and anthropometric data on belt squat load. Thirty-one participants (16 males and 15 females) completed anthropometric measurements, a demographic questionnaire, a familiarization visit, and two testing visits, completing a 5 repetition maximum test for back squat and belt squat...
June 8, 2017: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/28593095/load-enhanced-movement-quality-screening-and-tactical-athleticism-an-extension-of-evidence
#12
Stephen M Glass, Randy J Schmitz, Christopher K Rhea, Scott E Ross
BACKGROUND: Military organizations use movement quality screening for prediction of injury risk and performance potential. Currently, evidence of an association between movement quality and performance is limited. Recent work has demonstrated that external loading strengthens the relationship between movement screens and performance outcomes. Such loading may therefore steer us toward robust implementations of movement quality screens while maintaining their appeal as cost effective, field-expedient tools...
June 2017: International Journal of Sports Physical Therapy
https://www.readbyqxmd.com/read/28593087/a-dynamic-valgus-index-that-combines-hip-and-knee-angles-assessment-of-utility-in-females-with-patellofemoral-pain
#13
Sara A Scholtes, Gretchen B Salsich
BACKGROUND: Two=dimensional motion analysis of lower=extremity movement typically focuses on the knee frontal plane projection angle, which considers the position of the femur and the tibia. A measure that includes the pelvis may provide a more comprehensive and accurate indicator of lower=extremity movement. Hypothesis/Purpose: The purpose of the study was to describe the utility of a two=dimensional dynamic valgus index (DVI) in females with patellofemoral pain. The hypothesis was that the DVI would be more reliable and valid than the knee frontal plane projection angle, be greater in females with patellofemoral pain during a single=limb squat than in females without patellofemoral pain, and decrease in females with patellofemoral pain following instruction...
June 2017: International Journal of Sports Physical Therapy
https://www.readbyqxmd.com/read/28593085/postural-stability-and-kinetic-change-in-subjects-with-patellofemoral-pain-after-a-nine-week-hip-and-core-strengthening-intervention
#14
Patrick M Carry, Raj Gala, Kate Worster, Susan Kanai, Nancy H Miller, David James, Aaron J Provance, James J Carollo
BACKGROUND: Idiopathic patellofemoral pain (PFP) has been linked to hip weakness and abnormal lower extremity mechanics. The effect of a strengthening intervention on balance has not been well studied among individuals with PFP. HYPOTHESIS/PURPOSE: The primary aim of this study was to evaluate changes in center of pressure displacement during the single limb squat following a nine-week physical therapy intervention among adolescent females with PFP. STUDY DESIGN: Interventional and cross-sectional...
June 2017: International Journal of Sports Physical Therapy
https://www.readbyqxmd.com/read/28593068/occupational-exposure-to-knee-loading-and-the-risk-of-osteoarthritis-of-the-knee-a-systematic-review-and-a-dose-response-meta-analysis
#15
REVIEW
Jos Verbeek, Christina Mischke, Rachel Robinson, Sharea Ijaz, Paul Kuijer, Arthur Kievit, Anneli Ojajärvi, Kaisa Neuvonen
BACKGROUND: Osteoarthritis of the knee is considered to be related to knee straining activities at work. The objective of this review is to assess the exposure dose-response relation between kneeling or squatting, lifting, and climbing stairs at work, and knee osteoarthritis. METHODS: We included cohort and case-control studies. For each study that reported enough data, we calculated the odds ratio (OR) per 5,000 hours of cumulative kneeling and per 100,000 kg of cumulative lifting...
June 2017: Safety and Health At Work
https://www.readbyqxmd.com/read/28584310/effects-of-external-loading-on-lumbar-extension-moment-during-squat-lifting
#16
Iman Vahdat, Mostafa Rostami, Farhad Tabatabai Ghomsheh, Siamak Khorramymehr, Ali Tanbakoosaz
OBJECTIVES: The main objective of this study has been qualitative investigation of the effects of external loading on the lumbar extension moment during squat lifting. Findings of this study may allow to determine the factor with the most considerable effect on the lumbar extension moment and may help determine the lumbar spine risk factors at temporo-spatial coordination during squat lifting. MATERIAL AND METHODS: Twelve healthy men volunteered to perform slow and fast squat lifting of a box of varied mass (4 kg, 8 kg and 12 kg)...
May 29, 2017: International Journal of Occupational Medicine and Environmental Health
https://www.readbyqxmd.com/read/28583062/multiple-ligament-reconstruction-for-absent-cruciate-and-a-congenital-short-femur-case-report-and-review-of-the-literature
#17
Daniel Kaplan, Taylor Jazrawi, Jason Capo, Eric Strauss
Congenital short femur syndrome is a rare condition affecting about 0.017 of every 1,000 births. Patients frequently have ligamentous abnormalities, most frequently aplastic or hypoplastic cruciate ligaments. Advances in limb lengthening procedures have increased movement expectations for these patients, thus necessitating surgical treatment for their ligamentous abnormalities. An individual case is presented, including history, physical exam, and imaging demonstrating both the short femur and absent cruciate ligaments...
April 2017: Bulletin of the Hospital for Joint Diseases
https://www.readbyqxmd.com/read/28581367/carbohydrate-mouth-rinse-improves-morning-high-intensity-exercise-performance
#18
Neil D Clarke, Scott Hammond, Evangelos Kornilios, Peter D Mundy
Oral carbohydrate (CHO) rinsing has been demonstrated to provide beneficial effects on exercise performance of durations of up to one hour. The aim of the present study was to investigate the effects of CHO mouth rinsing on morning high-intensity exercise performance. Following institutional ethical approval and familiarisation, 12 healthy males (mean ± SD age: 23 ± 3 years, height: 175.5 ± 7.4 cm, body mass: 75.4 ± 7.5 kg) participated in this study. Countermovement jump (CMJ) height, isometric mid-thigh pull peak force, 10 m sprint time and bench press and back squat repetitions to failure were assessed following CHO and placebo (PLA) rinsing or a control condition (CON)...
June 5, 2017: European Journal of Sport Science
https://www.readbyqxmd.com/read/28579190/effect-of-low-level-laser-therapy-lllt-and-light-emitting-diodes-ledt-applied-during-combined-training-on-performance-and-post-exercise-recovery-protocol-for-a-randomized-placebo-controlled-trial
#19
Aryane Flauzino Machado, Jéssica Kirsch Micheletti, Franciele Marques Vanderlei, Fabio Yuzo Nakamura, Ernesto Cesar Pinto Leal-Junior, Jayme Netto Junior, Carlos Marcelo Pastre
BACKGROUND: Previous studies have shown positive results of phototherapy for improving performance and accelerating recovery; however, the effects of phototherapy during training and after a primary adaptation remain unclear. The aim of this randomized controlled trial is to analyze the effects of phototherapy and combined training on clinical, functional, and psychological outcomes and on vascular endothelial growth factor. METHODS: This randomized placebo-controlled trial by stratified sample will involve 45 healthy male participants...
May 20, 2017: Brazilian Journal of Physical Therapy
https://www.readbyqxmd.com/read/28578844/does-the-dual-mobility-hip-prosthesis-produce-better-joint-kinematics-during-extreme-hip-flexion-task
#20
Danilo S Catelli, Erik Kowalski, Paul E Beaulé, Mario Lamontagne
BACKGROUND: Total hip arthroplasty (THA) using dual-mobility (DM) design permits larger hip range of motion. However, it is unclear how it benefits the patients during activities of daily living. The purpose was to compare kinematic variables of the operated limb between THA patients using either DM or single-bearing (SB) implants during a squat task. METHODS: Twenty-four THA patients were randomly assigned to either a DM or SB implant and matched to 12 healthy controls (CTRLs)...
May 5, 2017: Journal of Arthroplasty
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