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https://www.readbyqxmd.com/read/29345555/the-preparation-period-in-basketball-training-load-and-neuromuscular-adaptations
#1
Davide Ferioli, Andrea Bosio, Johann C Bilsborough, Antonio La Torre, Michele Tornaghi, Ermanno Rampinini
PURPOSE: To investigate the 1) effect of the preparation period on the neuromuscular characteristics of 12 professional (PRO) and 16 semi-professional (SEMI-PRO) basketball players; 2) relationships between training load indices and changes in neuromuscular physical performance. METHODS: Prior to and following the preparation period, players underwent a counter-movement jump (CMJ) test, followed by a repeated change of direction (COD) test consisting of 4 levels with increasing intensities...
January 18, 2018: International Journal of Sports Physiology and Performance
https://www.readbyqxmd.com/read/29340745/a-6-week-warm-up-injury-prevention-programme-results-in-minimal-biomechanical-changes-during-jump-landings-a-randomized-controlled-trial
#2
Jeffrey B Taylor, Kevin R Ford, Randy J Schmitz, Scott E Ross, Terry A Ackerman, Sandra J Shultz
PURPOSE: To examine the extent to which an ACL injury prevention programme modifies lower extremity biomechanics during single- and double-leg landing tasks in both the sagittal and frontal plane. It was hypothesized that the training programme would elicit improvements in lower extremity biomechanics, but that these improvements would be greater during a double-leg sagittal plane landing task than tasks performed on a single leg or in the frontal plane. METHODS: Ninety-seven competitive multi-directional sport athletes that competed at the middle- or high-school level were cluster randomized into intervention (n = 48, age = 15...
January 16, 2018: Knee Surgery, Sports Traumatology, Arthroscopy: Official Journal of the ESSKA
https://www.readbyqxmd.com/read/29337833/effects-of-plyometric-and-resistance-training-on-muscle-strength-explosiveness-and-neuromuscular-function-in-young-adolescent-soccer-players
#3
Brandon John McKinlay, Phillip Wallace, Raffy Dotan, Devon Long, Craig Tokuno, David Gabriel, Bareket Falk
This study examined the effect of 8-weeks of free-weight-resistance (RT) and plyometric (PLYO) training on maximal strength, explosiveness and jump performance compared with no added training (CON), in young male soccer players. Forty-one 11[FIGURE DASH]13-year-old soccer players were divided into three groups (RT, PLYO, CON). All participants completed isometric and dynamic (240°/s) knee extensions pre- and post-training. Peak torque (pT), peak rate of torque development (pRTD), electromechanical-delay (EMD), rate of muscle activation (Q50), m...
January 4, 2018: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/29337022/reaction-time-and-joint-kinematics-during-functional-movement-in-recently-concussed-individuals
#4
Robert C Lynall, J Troy Blackburn, Kevin M Guskiewicz, Stephen W Marshall, Prudence Plummer, Jason P Mihalik
OBJECTIVE: To compare movement reaction time and joint kinematics between recently concussed and matched control recreational athletes during 3 functional tasks. DESIGN: Cross-sectional. SETTING: Laboratory. PARTICIPANTS: Thirty college-aged recreational athletes comprising two groups (15 participants each): 1) Recent concussion group (median time since concussion 126 days, range 28-432 days), and 2) Age- and sex-matched control group with no recent concussions...
January 11, 2018: Archives of Physical Medicine and Rehabilitation
https://www.readbyqxmd.com/read/29334580/the-power-load-relationship-during-a-countermovement-jump-a-joint-level-analysis
#5
Kym J Williams, Dale W Chapman, Elissa J Phillips, Nick Ball
This study aimed to investigate if hip, knee and ankle peak power is influenced by the relative load lifted, altering the joint and system load-power relationship during a countermovement jump (CMJ). Twenty-Three male national representative athletes (age: 20.3 ± 3.1y, squat 1RM: 133.8 ± 24.8kg) completed three CMJs at relative barbell loads of 0, 10, 20, 30 and 40% of an athlete's estimated back squat 1RM. Ground reaction force and joint kinematics were captured using a 16 camera motion capture array integrated with two in ground tri-axial force plates...
January 12, 2018: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/29326905/neuromuscular-features-in-sprinters-with-cerebral-palsy-case-studies-based-on-paralympic-classification
#6
Diego Antunes, Mateus Rossato, Rafael Lima Kons, Raphael Luiz Sakugawa, Gabriela Fischer
Despite the evolution of runner performance in athletes with cerebral palsy (CP), little is known about neuromuscular parameters of sprinters from different classes, especially related to power output, muscular imbalances and asymmetry indexes in lower limbs. The aim of this study was to assess muscle power, muscular imbalance and asymmetry in sprinters with CP. Four male sprinters with CP (age, 18 to 27 years; body mass, 58.5 to 72.8 kg; height, 161.5 to 174 cm) classified as T38, T37, T36, T35 according to International Paralympic Committee functional classification, performed vertical counter movement jump and squat jump on force plate and isokinetic torque evaluations in both limbs...
December 2017: Journal of Exercise Rehabilitation
https://www.readbyqxmd.com/read/29320946/cognitive-demands-influence-lower-extremity-mechanics-during-a-drop-vertical-jump-task-in-female-athletes
#7
Thomas Gus Almonroeder, Thomas Kernozek, Stephen Cobb, Brooke Slavens, Jinsung Wang, Wendy Huddleston
Study Design Cross-sectional study. Background The drop vertical jump task is commonly used in anterior cruciate ligament injury risk screening; however, the predictive validity is limited. Part of the limited predictive validity may be because the drop vertical jump task does not impose cognitive demands that reflect sports participation. Objectives To investigate the influence of additional cognitive demands on lower extremity mechanics during execution of the drop vertical jump task. Methods Twenty uninjured females (ages 18-25 years old) were required to perform the standard drop vertical jump task, as well as drop vertical jumps which included additional cognitive demands...
January 10, 2018: Journal of Orthopaedic and Sports Physical Therapy
https://www.readbyqxmd.com/read/29318174/sagittal-plane-hip-knee-and-ankle-biomechanics-and-the-risk-of-anterior-cruciate-ligament-injury-a-prospective-study
#8
Mari Leppänen, Kati Pasanen, Tron Krosshaug, Pekka Kannus, Tommi Vasankari, Urho M Kujala, Roald Bahr, Jarmo Perttunen, Jari Parkkari
Background: Stiff landings with less knee flexion and high vertical ground-reaction forces have been shown to be associated with an increased risk of anterior cruciate ligament (ACL) injury. The literature on the association between other sagittal plane measures and the risk of ACL injuries with a prospective study design is lacking. Purpose: To investigate the relationship between selected sagittal plane hip, knee, and ankle biomechanics and the risk of ACL injury in young female team-sport athletes...
December 2017: Orthopaedic Journal of Sports Medicine
https://www.readbyqxmd.com/read/29284166/functional-screening-tests-interrelationships-and-ability-to-predict-vertical-jump-performance
#9
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...
December 28, 2017: International Journal of Sports Medicine
https://www.readbyqxmd.com/read/29283696/the-neuromuscular-determinants-of-unilateral-jump-performance-in-soccer-players-are-direction-specific
#10
Conall Murtagh, Christopher Nulty, Jos Vanrenterghem, Andy O'Boyle, Ryland Morgans, Barry Drust, Robert Erskine
PURPOSE: To investigate differences in neuromuscular factors between elite and non-elite players, and to establish which factors underpin direction-specific unilateral jump performance. METHODS: Elite (n=23; age, 18.1 ± 1.0 yrs; BMI, 23.1 ± 1.8 kg/m2) and non-elite (n=20; age, 22.3 ± 2.7 yrs; BMI, 23.8 ± 1.8 kg/m2) soccer players performed three unilateral countermovement jumps (CMJs) on a force platform in the vertical, horizontal-forward and medial directions...
December 28, 2017: International Journal of Sports Physiology and Performance
https://www.readbyqxmd.com/read/29281799/age-influences-biomechanical-changes-after-participation-in-an-anterior-cruciate-ligament-injury-prevention-program
#11
Julie A Thompson-Kolesar, Corey T Gatewood, Andrew A Tran, Amy Silder, Rebecca Shultz, Scott L Delp, Jason L Dragoo
BACKGROUND: The prevalence of anterior cruciate ligament (ACL) injuries increases during maturation and peaks during late adolescence. Previous studies suggested an age-related association between participation in injury prevention programs and reduction of ACL injury. However, few studies have investigated differences in biomechanical changes after injury prevention programs between preadolescent and adolescent athletes. Purpose/Hypothesis: The purpose was to investigate the influence of age on the effects of the FIFA Medical and Research Centre (F-MARC) 11+ injury prevention warm-up program on differences in biomechanical risk factors for ACL injury between preadolescent and adolescent female soccer players...
December 1, 2017: American Journal of Sports Medicine
https://www.readbyqxmd.com/read/29247811/irradiated-allograft-versus-autograft-for-anterior-cruciate-ligament-reconstruction-a-meta-analysis-and-systematic-review-of-prospective-studies
#12
REVIEW
Hong-De Wang, Yan-Bin Zhu, Tian-Rui Wang, Wei-Fei Zhang, Ying-Ze Zhang
BACKGROUND: Irradiated allografts and autografts are commonly used for anterior cruciate ligament (ACL) reconstruction. The outcomes between these two grafts are controversial. This meta-analysis and systematic review of prospective comparative studies was performed to compare the clinical outcomes, including knee functionality, stability, subjective evaluation, complications, and failure, of irradiated allografts and autografts in primary ACL reconstruction. MATERIALS AND METHODS: PubMed, Embase, and the Cochrane Library were searched from database inception to 12 August 2017 to identify prospective studies that compared irradiated allografts with autografts for primary ACL reconstruction...
December 13, 2017: International Journal of Surgery
https://www.readbyqxmd.com/read/29233241/protective-knee-braces-and-the-biomechanics-of-the-half-squat-parachute-landing
#13
Di Wu, Chao Zheng, Ji Wu, Longfeng Wang, Xiang Wei, Lizheng Wang
INTRODUCTION: Knee injuries are common among paratroopers and skydivers during landing maneuvers. The aim of this study was to investigate the effects of dropping height and the use of protective knee braces on parachute landing biomechanics. METHODS: The study cohort consisted of 30 male elite paratroopers with formal parachute landing training and more than 2 yr of parachute jumping experience. Each participant was instructed to jump off a platform at two different heights (40 and 80 cm, respectively) and land on force plates in a half-squat posture...
January 1, 2018: Aerospace Medicine and Human Performance
https://www.readbyqxmd.com/read/29189581/impact-of-10-minute-interval-roller-massage-on-performance-and-active-range-of-motion
#14
D D Hodgson, P J Quigley, J H D Whitten, J C Reid, David G Behm
Hodgson, DD, Quigley, PJ, Whitten, JHD, Reid, JC, and Behm, DG. Impact of 10-minute interval roller massage on performance and active range of motion. J Strength Cond Res XX(X): 000-000, 2017-Roller massage (RM) has been shown to increase range of motion (ROM) without subsequent performance deficits. However, prolonged static stretching (SS) can induce performance impairments. The objective of this study was to examine the effects of combining SS and RM with and without subsequent RM on ROM and neuromuscular performance...
November 16, 2017: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/29182895/efficacy-of-downhill-running-training-for-improving-muscular-and-aerobic-performances
#15
Junichi Toyomura, Hisashi Mori, Kota Tayashiki, Masayoshi Yamamoto, Hiroaki Kanehisa, Sumiaki Maeo
This study investigated effects of downhill (DR) versus level (LR) running training on various muscular and aerobic performances. Eighteen healthy young males conducted either DR (DR group [DRG], n = 10: -10% slope) or LR (LR group [LRG], n = 8) training at a target heart rate (HR) associated with lactate threshold (LT) for 20 min·session<sup>-1</sup>, 3 sessions·week<sup>-1</sup>, for 5 weeks. Before and after the interventions, the following variables were measured: knee extension torque (-150, -30, 0, 30, 150°·s<sup>-1</sup>), leg extension power (simultaneous hip and knee extension: 0...
November 28, 2017: Applied Physiology, Nutrition, and Metabolism, Physiologie Appliquée, Nutrition et Métabolisme
https://www.readbyqxmd.com/read/29172028/neural-adaptations-in-quadriceps-muscle-after-4-weeks-of-local-vibration-training-in-young-versus-old-subjects
#16
Robin Souron, Thibault Besson, Thomas Lapole, Guillaume Y Millet
This study investigated the effects of a 4-week local vibration training (LVT) on the function of the knee extensors and corticospinal properties in healthy young and old subjects. Seventeen subjects (9 young and 8 old) performed 3 testing sessions: before (PRE1) and after (PRE2) a 4-week resting period to control the repeatability of the data as well as after the LVT (POST). Jump performance, maximal voluntary force (MVC) and electromyographic (EMG) activity on vastus lateralis (VL) and rectus femoris (RF) muscles were assessed...
November 24, 2017: Applied Physiology, Nutrition, and Metabolism, Physiologie Appliquée, Nutrition et Métabolisme
https://www.readbyqxmd.com/read/29167568/elite-long-jumpers-with-below-the-knee-prostheses-approach-the-board-slower-but-take-off-more-effectively-than-non-amputee-athletes
#17
Steffen Willwacher, Johannes Funken, Kai Heinrich, Ralf Müller, Hiroaki Hobara, Alena M Grabowski, Gert-Peter Brüggemann, Wolfgang Potthast
The use of technological aids to improve sport performance ('techno doping') and inclusion of Paralympic athletes in Olympic events are matters of ongoing debate. Recently, a long jumper with a below the knee amputation (BKA) achieved jump distances similar to world-class athletes without amputations, using a carbon fibre running-specific prosthesis (RSP). We show that athletes with BKA utilize a different, more effective take-off technique in the long jump, which provided the best athlete with BKA a performance advantage of at least 0...
November 22, 2017: Scientific Reports
https://www.readbyqxmd.com/read/29165734/effects-of-age-joint-angle-and-test-modality-on-strength-production-and-functional-outcomes
#18
Brennan J Thompson, Morgan Whitson, Eric J Sobolewski, Matt S Stock
This study investigated the impact of age, knee joint angle, and strength testing modality on lower body maximal and rapid strength production and assessed the transferability of these characteristics to mobility-related function. Twenty young (age=21.9 yrs) and eighteen elderly (71.1 yrs) adults performed single-joint and multiple-joint isometric maximal voluntary contractions at three knee angles. Outcome measures included peak torque (PT), rate of torque development (RTD), jump height, power, 10 and 400 m walk, and timed chair stand...
November 17, 2017: International Journal of Sports Medicine
https://www.readbyqxmd.com/read/29163219/neuromuscular-training-improves-lower-extremity-biomechanics-associated-with-knee-injury-during-landing-in-11-13-year-old-female-netball-athletes-a-randomized-control-study
#19
Amanda J Hopper, Erin E Haff, Christopher Joyce, Rhodri S Lloyd, G Gregory Haff
The purpose of this study was to examine the effects of a neuromuscular training (NMT) program on lower-extremity biomechanics in youth female netball athletes. The hypothesis was that significant improvements would be found in landing biomechanics of the lower-extremities, commonly associated with anterior cruciate ligament (ACL) injury, following NMT. Twenty-three athletes (age = 12.2 ± 0.9 years; height = 1.63 ± 0.08 m; mass = 51.8 ± 8.5 kg) completed two testing sessions separated by 7-weeks and were randomly assigned to either a experimental or control group...
2017: Frontiers in Physiology
https://www.readbyqxmd.com/read/29154692/landing-kinematics-and-kinetics-at-the-knee-during-different-landing-tasks
#20
Nicholas R Heebner, Deirdre M Rafferty, Meleesa F Wohleber, Andrew J Simonson, Mita Lovalekar, Andrew Reinert, Timothy C Sell
CONTEXT:   Several tasks have been used to examine landing biomechanics for evaluation and rehabilitation, especially as related to anterior cruciate ligament injuries. However, comparing results among studies in which different tasks were used can be difficult, and it is unclear which task may be most appropriate. OBJECTIVE:   To compare lower extremity biomechanics across 5 commonly used landing tasks. DESIGN:   Descriptive laboratory study...
November 20, 2017: Journal of Athletic Training
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