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Hamstring eccentrics

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https://www.readbyqxmd.com/read/29781992/muscle-imbalances-testing-and-training-functional-eccentric-hamstring-strength-in-athletic-populations
#1
Petr Stastny, Michal Lehnert, James J Tufano
Many hamstring injuries that occur during physical activity occur while the muscles are lengthening, during eccentric hamstring muscle actions. Opposite of these eccentric hamstring actions are concentric quadriceps actions, where the larger and likely stronger quadriceps straighten the knee. Therefore, to stabilize the lower limbs during movement, the hamstrings must eccentrically combat against the strong knee-straightening torque of the quadriceps. As such, eccentric hamstring strength expressed relative to concentric quadricep strength is commonly referred to as the "functional ratio" as most movements in sports require simultaneous concentric knee extension and eccentric knee flexion...
May 1, 2018: Journal of Visualized Experiments: JoVE
https://www.readbyqxmd.com/read/29740557/hip-and-trunk-muscles-activity-during-nordic-hamstring-exercise
#2
Shideh Narouei, Atsushi Imai, Hiroshi Akuzawa, Kiyotaka Hasebe, Koji Kaneoka
The nordic hamstring exercise (NHE) is a dynamic lengthening hamstring exercise that requires trunk and hip muscles activation. Thigh muscles activation, specifically hamstring/quadriceps contractions has been previously examined during NHE. Trunk and hip muscles activity have not been enough studied. The aim of this study was to analyze of hip and trunk muscles activity during NHE. Surface electromyography (EMG) and kinematic data were collected during NHE. Ten healthy men with the age range of 21-36 years performed two sets of two repetitions with downward and upward motions each of NHE...
April 2018: Journal of Exercise Rehabilitation
https://www.readbyqxmd.com/read/29694677/interseason-variability-in-isokinetic-strength-and-poor-correlation-with-nordic-hamstring-eccentric-strength-in-football-players
#3
Nicol van Dyk, Erik Witvrouw, Roald Bahr
INTRODUCTION: In elite sport, the use of strength testing to establish muscle function and performance is common. Traditionally, isokinetic strength tests have been used, measuring torque during concentric and eccentric muscle action. A device that measures eccentric hamstring muscle strength while performing the Nordic hamstring exercise is now also frequently used. The study aims to investigate the variability of isokinetic muscle strength over time, e.g. between seasons, and the relationship between isokinetic testing and the new Nordic hamstring exercise device...
April 25, 2018: Scandinavian Journal of Medicine & Science in Sports
https://www.readbyqxmd.com/read/29685059/hamstring-muscle-use-in-females-during-hip-extension-and-the-nordic-hamstring-exercise-an-fmri-study
#4
Daniel J Messer, Matthew N Bourne, Morgan D Williams, Aiman Al Najjar, Anthony J Shield
Study Design Cross-sectional study. Background Understanding hamstring muscle activation patterns in resistance training exercises may have implications for the design of strength training and injury prevention programs. Unfortunately, surface electromyography studies have reported conflicting results with regard to hamstring muscle activation patterns in women. Objectives To determine the spatial patterns of hamstring muscle activity during the 45º hip-extension and Nordic hamstring exercises, in females using functional magnetic resonance imaging...
April 23, 2018: Journal of Orthopaedic and Sports Physical Therapy
https://www.readbyqxmd.com/read/29682311/acl-reconstruction-with-hamstring-tendon-autograft-and-accelerated-brace-free-rehabilitation-a-systematic-review-of-clinical-outcomes
#5
Rob P A Janssen, Nicky van Melick, Jan B A van Mourik, Max Reijman, Lodewijk W van Rhijn
Objective: To investigate the clinical outcomes after hamstring tendon autograft ACL reconstruction (ACLR) with accelerated, brace-free rehabilitation. Design: Systematic review according to Preferred Reporting Items for Systematic Reviews and Meta-Analysis guidelines. Data sources: Embase, MEDLINE Ovid, Web of Science, Cochrane CENTRAL and Google scholar from 1 January 1974 to 31 January 2017. Eligibility criteria for selecting studies: Study designs reporting outcomes in adults after arthroscopic, primary ACLR with hamstring autograft and accelerated, brace-free rehabilitation...
2018: BMJ Open Sport & Exercise Medicine
https://www.readbyqxmd.com/read/29671490/common-running-injuries-evaluation-and-management
#6
Michael J Arnold, Aaron L Moody
Running is a common form of exercise but predisposes athletes to several running-related injuries. Most running injuries are due to overuse and respond to conservative treatment. Tendinopathies in the patellar, Achilles, and hamstring tendons are common, and are primarily treated with eccentric exercise. Iliotibial band syndrome and patellofemoral pain syndrome are less common than patellar tendinopathy and are treated by strengthening exercises for the core and legs in addition to flexibility exercises. Acute hamstring strains and medial tibial stress syndrome require a period of relative rest, followed by stretching and graded return to activity...
April 15, 2018: American Family Physician
https://www.readbyqxmd.com/read/29669458/effects-of-dance-exergaming-on-depressive-symptoms-fear-of-falling-and-musculoskeletal-function-in-fallers-and-non-fallers-community-dewlling-older-women
#7
Elisângela Valevein Rodrigues, Luiza Herminia Gallo, Ana Tereza Bittencourt Guimarães, Jarbas Melo Filho, Bruna Cavon Luna, Anna Raquel Silveira Gomes
The aim of this study was to evaluate the effects of a pop dance exergaming protocol on fall risk factors-depressive symptoms, fear of falling and musculoskeletal function-in community-dwelling, older female fallers and non-fallers. There were 47 community-dwelling older women assigned to the Intervention Group [fallers (n=10, 69.8 ± 4.3 years); non-fallers (n = 12, 68.9 ± 3.3 years)] or the Control Group [fallers (n = 12, 73.6 ± 5.4 years); non-fallers (n = 13, 68.7 ± 4.8 years)]. The Control Group maintained their lifestyle and the Intervention Group performed a videogame dance training three times per week for 12 weeks...
April 19, 2018: Rejuvenation Research
https://www.readbyqxmd.com/read/29625360/correlation-between-quadriceps-and-hamstrings-inter-limb-strength-asymmetry-with-change-of-direction-and-sprint-in-u21-elite-soccer-players
#8
Giuseppe Coratella, Marco Beato, Federico Schena
The aim of this study was to investigate the relationship between in quadriceps and hamstrings inter-limb strength asymmetry and change of direction, sprinting and jumping abilities in U21 elite soccer players. Twenty-seven soccer players volunteered for this study. Isokinetic quadriceps and hamstrings peak torque was measured at high and low angular velocities, both in concentric and eccentric modalities. Performance in agility T-test, 20 + 20 m shuttle-test, 10 m and 30 m sprint, squat jump (SJ) and counter-movement jump (CMJ), were measured...
April 3, 2018: Human Movement Science
https://www.readbyqxmd.com/read/29621015/hamstring-muscle-injury-prediction-by-isokinetic-ratios-depends-on-the-method-used
#9
Marc Dauty, Pierre Menu, Alban Fouasson-Chailloux
OBJECTIVES: Hamstring muscle injury prediction by isokinetic strength ratios is low but could result from the method-depending either on the use of the limbs or of the sportsmen as references. We aimed to establish a predictive model including unilateral and bilateral ratios calculated from the dominant, nondominant, right, and left limb in injured and uninjured professional soccer players. DESIGN: Cohort study. SETTING: Soccer team of the French Professional Premier League...
April 4, 2018: Clinical Journal of Sport Medicine: Official Journal of the Canadian Academy of Sport Medicine
https://www.readbyqxmd.com/read/29572976/the-effect-of-nordic-hamstring-exercise-training-volume-on-biceps-femoris-long-head-architectural-adaptation
#10
Joel D Presland, Ryan G Timmins, Matthew N Bourne, Morgan D Williams, David A Opar
PURPOSE: To determine the time course of architectural adaptations in the biceps femoris long head (BFLH ) following high or low volume eccentric training. METHODS: Twenty recreationally active males completed a two week standardised period of eccentric Nordic hamstring exercise (NHE) training, followed by four weeks of high (n=10) or low volume (n=10) training. Eccentric strength was assessed pre and post intervention and following detraining. Architecture was assessed weekly during training and after two and four weeks of detraining...
March 23, 2018: Scandinavian Journal of Medicine & Science in Sports
https://www.readbyqxmd.com/read/29564846/different-muscle-action-training-protocols-on-quadriceps-hamstrings-neuromuscular-adaptations
#11
RANDOMIZED CONTROLLED TRIAL
Cassio V Ruas, Lee E Brown, Camila D Lima, G Gregory Haff, Ronei S Pinto
The aim of this study was to compare three specific concentric and eccentric muscle action training protocols on quadriceps-hamstrings neuromuscular adaptations. Forty male volunteers performed 6 weeks of training (two sessions/week) of their dominant and non-dominant legs on an isokinetic dynamometer. They were randomly assigned to one of four groups; concentric quadriceps and concentric hamstrings (CON/CON, n=10), eccentric quadriceps and eccentric hamstrings (ECC/ECC, n=10), concentric quadriceps and eccentric hamstrings (CON/ECC, n=10), or no training (CTRL, n=10)...
May 2018: International Journal of Sports Medicine
https://www.readbyqxmd.com/read/29541126/the-reliability-and-validity-of-a-video-based-method-for-assessing-hamstring-strength-in-football-players
#12
Justin W Y Lee, Cheng Li, Patrick S H Yung, Kai-Ming Chan
Background/Objective: Evaluating hamstring strength by isokinetic dynamometry is limited by various practical issues such as time and cost. A video-based Nordic hamstring exercise is introduced as an alternative option. The aims of this study are to evaluate 1.) the between-session reliability and 2.) concurrent validity of the testing method compared to a standardized isokinetic dynamometry. Methods: Thirty male elite footballers were recruited for the study. From the Nordic hamstring exercise, the video-analysis-determined Nordic break-point angles where the participant could no longer withstand the force of the fall (eccentric mode) and the number of seconds that the player could hold at 30° forward flexion angle (isometric mode) were measured...
June 2017: Journal of Exercise Science and Fitness
https://www.readbyqxmd.com/read/29533672/muscle-strength-is-a-poor-screening-test-for-predicting-lower-extremity-injuries-in-professional-male-soccer-players-a-2-year-prospective-cohort-study
#13
Arnhild Bakken, Stephen Targett, Tone Bere, Cristiano Eirale, Abdulaziz Farooq, Andrea B Mosler, Johannes L Tol, Rod Whiteley, Karim M Khan, Roald Bahr
BACKGROUND: Lower extremity muscle strength tests are commonly used to screen for injury risk in professional soccer. However, there is limited evidence on the ability of such tests in predicting future injuries. PURPOSE: To examine the association between hip and thigh muscle strength and the risk of lower extremity injuries in professional male soccer players. STUDY DESIGN: Case-control study; Level of evidence, 3. METHODS: Professional male soccer players from 14 teams in Qatar underwent a comprehensive strength assessment at the beginning of the 2013/2014 and 2014/2015 seasons...
May 2018: American Journal of Sports Medicine
https://www.readbyqxmd.com/read/29529387/the-effects-of-different-passive-static-stretching-intensities-on-recovery-from-unaccustomed-eccentric-exercise-a-randomized-controlled-trial
#14
Nikos C Apostolopoulos, Ian M Lahart, Michael J Plyley, Jack Taunton, Alan M Nevill, Yiannis Koutedakis, Matthew Wyon, George S Metsios
Effects of passive static stretching intensity on recovery from unaccustomed eccentric exercise of right knee extensors was investigated in 30 recreationally active males randomly allocated into three groups: high-intensity (70-80% maximum perceived stretch), low-intensity (30-40% maximum perceived stretch), and control. Both stretching groups performed 3 sets of passive static stretching exercises of 60s each for hamstrings, hip flexors, and quadriceps, over 3 consecutive days, post-unaccustomed eccentric exercise...
March 12, 2018: Applied Physiology, Nutrition, and Metabolism, Physiologie Appliquée, Nutrition et Métabolisme
https://www.readbyqxmd.com/read/29503012/eccentric-knee-flexor-strength-profiles-of-341-elite-male-academy-and-senior-gaelic-football-players-do-body-mass-and-previous-hamstring-injury-impact-performance
#15
Mark Roe, Shane Malone, Eamonn Delahunt, Kieran Collins, Conor Gissane, Ulrik McCarthy Persson, John C Murphy, Catherine Blake
OBJECTIVE: Report eccentric knee flexor strength values of elite Gaelic football players from underage to adult level whilst examining the influence of body mass and previous hamstring injury. DESIGN: Cross-sectional study. SETTING: Team's training facility. PARTICIPANTS: Elite Gaelic football players (n = 341) from under 14 years to senior age-grades were recruited from twelve teams. MAIN OUTCOME MEASURES: Absolute (N) and relative (N·kg-1 ) eccentric hamstring strength as well as corresponding between-limb imbalances (%) were calculated for all players...
May 2018: Physical Therapy in Sport
https://www.readbyqxmd.com/read/29485920/age-related-differences-in-functional-hamstring-quadriceps-ratio-following-soccer-exercise-in-female-youth-players-an-injury-risk-factor
#16
Mark De Ste Croix, Abigail Priestley, Rhodri Lloyd, Jon Oliver
PURPOSE: Fatigue negatively alters dynamic knee control, and the functional hamstring/quadriceps ratio (H/QFUNC ) plays an important role in stabilizing the joint. The aim of this study was to investigate the influence of soccer-specific exercise on H/QFUNC in under (U) 13-, U15-, and U17-year-old female soccer players. METHODS: A total of 36 female players performed concentric and eccentric actions of the hamstrings at 60°, 120°, and 180°/s before and after an age group-specific field-based soccer protocol...
February 27, 2018: Pediatric Exercise Science
https://www.readbyqxmd.com/read/29484246/isokinetic-assessment-of-muscular-strength-and-balance-in-brazilian-elite-futsal-players
#17
Renan F H Nunes, Rodolfo A Dellagrana, Fábio Y Nakamura, Cosme F Buzzachera, Flavia A M Almeida, Lucinar J F Flores, Luiz G A Guglielmo, Sérgio G da Silva
Purpose/Background: Strength asymmetries are related to knee injuries in intermittent sports players. The purpose of this study was to examine whether elite futsal players demonstrate strength asymmetries during knee isokinetic testing applying the Croisier et al.21 criteria. Methods: Forty male elite (27.9 ± 6.5 years) Brazilian futsal players participated in the study. The testing protocol required players to perform concentric contractions of both quadriceps and hamstring muscles at angular velocities of 60 °·s-1 and 240 °·s-1 and eccentric contractions of hamstring at 30 °·s-1 and 120 °·s-1 ...
February 2018: International Journal of Sports Physical Therapy
https://www.readbyqxmd.com/read/29467666/time-course-and-association-of-functional-and-biochemical-markers-in-severe-semitendinosus-damage-following-intensive-eccentric-leg-curls-differences-between-and-within-subjects
#18
Gerard Carmona, Jurdan Mendiguchía, Xavier Alomar, Josep M Padullés, David Serrano, Lexa Nescolarde, Gil Rodas, Roser Cussó, Ramón Balius, Joan A Cadefau
Purpose: To investigate the extent and evolution of hamstring muscle damage caused by an intensive bout of eccentric leg curls (ELCs) by (1) assessing the time course and association of different indirect markers of muscle damage such as changes in the force-generating capacity (FGC), functional magnetic resonance (fMRI), and serum muscle enzyme levels and (2) analyzing differences in the degree of hamstring muscle damage between and within subjects (limb-to-limb comparison). Methods: Thirteen male participants performed six sets of 10 repetitions of an ELC with each leg...
2018: Frontiers in Physiology
https://www.readbyqxmd.com/read/29420390/specific-adaptations-in-performance-and-muscle-architecture-after-weighted-jump-squat-vs-body-mass-squat-jump-training-in-recreational-soccer-players
#19
Giuseppe Coratella, Marco Beato, Chiara Milanese, Stefano Longo, Eloisa Limonta, Susanna Rampichini, Emiliano Cè, Angela V Bisconti, Federico Schena, Fabio Esposito
Coratella, G, Beato, M, Milanese, C, Longo, S, Limonta, E, Rampichini, S, Cè, E, Bisconti, AV, Schena, F, and Esposito, F. Specific adaptations in performance and muscle architecture after weighted jump-squat vs. body mass squat jump training in recreational soccer players. J Strength Cond Res 32(4): 921-929, 2018-The aim of the present study was to compare the effects of weighted jump-squat training (WJST) vs. body mass squat jump training (BMSJT) on quadriceps' muscle architecture, lower-limb lean-mass (LM) and muscle strength, performance in change of direction (COD), and sprint and jump in recreational soccer players...
April 2018: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/29401195/effects-of-foam-rolling-on-range-of-motion-peak-torque-muscle-activation-and-the-hamstrings-to-quadriceps-strength-ratios
#20
Samantha N Madoni, Pablo B Costa, Jared W Coburn, Andrew J Galpin
PURPOSE: To examine the effects of foam rolling (FR), on range of motion, (ROM), peak torque (PT), hamstrings-to-quadriceps (H:Q) ratios, and muscle activation . METHODS: Twenty-two recreationally active women (mean age ± SD = 21.55 ± 1.82 years, 161.91 ± 6.58 cm, 61.47 ± 10.54 kg) volunteered for this study. Participants performed pre- and post-tests analyzing PT and surface electromyography (EMG) of their dominant limb completing maximal knee extension and flexion at three different velocities...
February 1, 2018: Journal of Strength and Conditioning Research
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