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https://www.readbyqxmd.com/read/28759603/the-isokinetic-strength-profile-of-elite-soccer-players-according-to-playing-position
#1
Robert Śliwowski, Monika Grygorowicz, Radosław Hojszyk, Łukasz Jadczak
The aim of this study was to compare isokinetic strength performance profiles in elite soccer players across different field positions. A total of 111 elite international players of Polish Ekstraklasa (the top division in Poland) were examined during the 2010-2015 seasons. The players were classified into six positional roles: central defenders (CD), external defenders (ED), central midfielders (CM), external midfielders (EM), forwards (F), and goalkeepers (G). The concentric isokinetic strength (peak torque [PT] of quadriceps and hamstrings, H/Q ratios) was calculated for the dominant leg and the non-dominant leg at angular velocity of 1...
2017: PloS One
https://www.readbyqxmd.com/read/28756392/a-comprehensive-strength-testing-protocol-offers-no-clinical-value-in-predicting-risk-of-hamstring-injury-a-prospective-cohort-study-of-413-professional-football-players
#2
Nicol van Dyk, Roald Bahr, Angus F Burnett, Rod Whiteley, Arnhild Bakken, Andrea Mosler, Abdulaziz Farooq, Erik Witvrouw
BACKGROUND: Hamstring injuries remain prevalent across a number of professional sports. In football, the incidence has even increased by 4% per year at the Champions League level over the last decade. The role of muscle strength or strength ratios and their association with risk of hamstring injury remain restricted by small sample sizes and inconclusive results. PURPOSE: The purpose of this study is to identify risk factors for hamstring injury in professional football players in an adequately powered, prospective cohort study...
July 29, 2017: British Journal of Sports Medicine
https://www.readbyqxmd.com/read/28720481/knee-extension-and-flexion-strength-asymmetry-in-human-immunodeficiency-virus-positive-subjects-a-cross-sectional-study
#3
Vitor H F Oliveira, Susana L Wiechmann, Argéria M S Narciso, Rafael Deminice
BACKGROUND: Human Immunodeficiency Virus positive subjects present impairment in muscle function, neural activation, balance, and gait. In other populations, all of these factors have been associated with muscle strength asymmetry. OBJECTIVE: To investigate the existence of muscle strength asymmetry between dominant and non-dominant lower limbs and to determine the hamstrings-to-quadriceps strength ratio in Human Immunodeficiency Virus positive subjects. METHODS: In this cross-sectional study, 48 subjects were included (22 men and 26 women; mean age 44...
July 3, 2017: Brazilian Journal of Physical Therapy
https://www.readbyqxmd.com/read/28717620/the-influence-of-muscle-tendon-forces-on-acl-loading-during-jump-landing-a-systematic-review
#4
REVIEW
Katja Oberhofer, S H Hosseini Nasab, Pascal Schütz, Barbara Postolka, Jess G Snedeker, William R Taylor, Renate List
BACKGROUND: The goal of this review is to summarise and discuss the reported influence of muscle-tendon forces on anterior cruciate ligament (ACL) loading during the jump-landing task by means of biomechanical analyses of the healthy knee. METHODS: A systematic review of the literature was conducted using different combinations of the terms "knee", "ligament", "load", "tension ", "length", "strain", "elongation" and "lengthening". 26 original articles (n=16 in vitro studies; n=10 in situ studies) were identified which complied with all inclusion/exclusion criteria...
January 2017: Muscles, Ligaments and Tendons Journal
https://www.readbyqxmd.com/read/28704309/effect-of-three-different-muscle-action-training-protocols-on-knee-strength-ratios-and-performance
#5
Cassio V Ruas, Lee E Brown, Camila D Lima, Pablo B Costa, Ronei S Pinto
Hamstring to quadriceps (H:Q) ratios are often used to assess strength imbalances. The aims of this study were to compare three different muscle action training protocols on H:Q strength balance and functional performance. Forty untrained males (age: 22.87 ± 2.28 y, mass: 70.66 ± 11.049 kg, ht: 174.29 ± 6.90 cm) performed 6 weeks of training on an isokinetic dynamometer. They were randomly assigned to one of 4 groups; concentric quadriceps and concentric hamstring (CON/CON), eccentric quadriceps and eccentric hamstring (ECC/ECC), concentric quadriceps and eccentric hamstring (CON/ECC), or no training (CNTRL)...
July 12, 2017: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/28575704/muscle-function-in-women-with-systemic-sclerosis-association-with-fatigue-and-general-physical-function
#6
Amanda Cristina Justo, Fernando Silva Guimarães, Arthur Sá Ferreira, Mauricio Santos Soares, Priscila Santos Bunn, Agnaldo José Lopes
BACKGROUND: Individuals with systemic sclerosis have muscle functions with varying degrees of muscle weakness and atrophy, which in turn can have a negative impact on functional and health-related quality of life. This study aimed to evaluate peripheral muscle performance using isokinetic dynamometry of the knee in women with systemic sclerosis and to correlate peripheral muscle dysfunction with disability levels and general fatigue. METHODS: Twenty-six women with systemic sclerosis and a matched control group with an equal number of women underwent knee isokinetic dynamometry at angular speeds of 75°/s and 240°/s, isometric handgrip strength, the Health Assessment Questionnaire Disability Index, the Functional Assessment of Chronic Illness Therapy-Fatigue scale, and the Fatigue Impact Scale...
May 26, 2017: Clinical Biomechanics
https://www.readbyqxmd.com/read/28566389/does-the-type-of-graft-affect-the-outcome-of-revision-anterior-cruciate-ligament-reconstruction-a-meta-analysis-of-32-studies
#7
REVIEW
A Grassi, M Nitri, S G Moulton, G M Marcheggiani Muccioli, A Bondi, M Romagnoli, S Zaffagnini
AIMS: Our aim was to perform a meta-analysis of the outcomes of revision anterior cruciate ligament (ACL) reconstruction, comparing the use of different types of graft. MATERIALS AND METHODS: A search was performed of Medline and Pubmed using the terms "Anterior Cruciate Ligament" and "ACL" combined with "revision", "re-operation" and "failure". Only studies that reported the outcome at a minimum follow-up of two years were included. Two authors reviewed the papers, and outcomes were subdivided into autograft and allograft...
June 2017: Bone & Joint Journal
https://www.readbyqxmd.com/read/28459795/four-weeks-of-nordic-hamstring-exercise-reduce-muscle-injury-risk-factors-in-young-adults
#8
João Breno de A R Alvares, Vanessa Bernardes Marques, Marco Aurélio Vaz, Bruno Manfredini Baroni
The Nordic hamstring exercise (NHE) is a field-based exercise designed for knee-flexor eccentric strengthening, aimed at muscle strains prevention. However, possible effects of NHE programmes on other hamstring injury risk factors remain unclear. The purpose of this study was to investigate the effects of a NHE training programme on multiple hamstring injury risk factors. Twenty physically active young adults were allocated into two equal sized groups: control group (CG) and training group (TG). The TG was engaged in a 4-week NHE programme, twice a week, 3 sets of 6-10 repetitions; while CG received no exercise intervention...
April 26, 2017: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/28416087/the-impact-of-joint-angle-and-movement-velocity-on-sex-differences-in-the-functional-hamstring-quadriceps-ratio
#9
Mark De Ste Croix, Youssif O ElNagar, John Iga, Francisco Ayala, David James
BACKGROUND: Females are two to eight times more likely to suffer a non-contact injury compared with males thus the purpose of this study was to explore the influence of joint angle and movement velocity on sex differences in the functional hamstring to quadriceps ratio (H/QFUNC). METHODS: Isokinetic concentric and eccentric torque were determined in 110 participants (55 males and 55 females) through a 90° range of movement at 60, 120, and 240°/s. Testing was performed with the hip flexed at 10°...
April 13, 2017: Knee
https://www.readbyqxmd.com/read/28409515/effects-of-stretching-and-fatigue-on-peak-torque-muscle-imbalance-and-stability
#10
Pablo B Costa, Cassio V Ruas, Cory M Smith
BACKGROUND: The present study examined the acute effects of hamstrings stretching and fatigue on knee extension and flexion peak torque (PT), hamstrings to quadriceps (H:Q) ratio, and postural stability. METHODS: Seventeen women (mean ± SD age = 21.8 ± 2.1 yrs; body mass = 63.0 ± 10.5 kg; height = 164.7 ± 6.2 cm) and eighteen men (25.8 ± 4.6 yrs; 83.6 ± 13.2 kg; 175.3 ± 6.0 cm) took part in three laboratory visits. The first visit was a familiarization session, and the subsequent two visits were randomly assigned as a control or stretching condition...
April 13, 2017: Journal of Sports Medicine and Physical Fitness
https://www.readbyqxmd.com/read/28388231/quadriceps-function-and-hamstrings-co-activation-after-anterior-cruciate-ligament-reconstruction
#11
Derek N Pamukoff, Brian G Pietrosimone, Eric D Ryan, Dustin R Lee, J Troy Blackburn
CONTEXT:   Individuals with anterior cruciate ligament reconstruction (ACLR) have quadriceps dysfunction that contributes to physical disability and posttraumatic knee osteoarthritis. Quadriceps function in the ACLR limb is commonly evaluated relative to the contralateral uninjured limb. Bilateral quadriceps dysfunction is common in individuals with ACLR, potentially biasing these evaluations. OBJECTIVE:   To compare quadriceps function between individuals with ACLR and uninjured control participants...
May 2017: Journal of Athletic Training
https://www.readbyqxmd.com/read/28378509/hamstring-to-quadriceps-fatigue-ratio-offers-new-and-different-muscle-function-information-than-the-conventional-non-fatigued-ratio
#12
M D Pinto, A J Blazevich, L L Andersen, P Mil-Homens, R S Pinto
Commonly used injury risk prediction tests such as the hamstring-to-quadriceps (H:Q) strength ratio appear to be poor predictors of non-contact injury. However, these tests are typically performed in a non-fatigued state, despite accumulated fatigue being an important risk factor for both hamstring strain (HS) and anterior cruciate ligament (ACL) injuries in professional soccer players. After the effect of different H:Q calculation methods were compared and contrasted, the influence of neuromuscular fatigue on the H:Q strength ratio and the association between fatigued and non-fatigued ratio scores were examined...
April 4, 2017: Scandinavian Journal of Medicine & Science in Sports
https://www.readbyqxmd.com/read/28378465/cutoffs-of-isokinetic-strength-ratio-and-hamstring-strain-prediction-in-professional-soccer-players
#13
M Dauty, P Menu, A Fouasson-Chailloux
Hamstring strain injuries frequently occur during professional soccer practice. Low hamstring strength represents an intrinsic modifiable risk factor but cutoffs of isokinetic knee strength ratios are controversial to predict hamstring strain in professional soccer players. We aimed to predict hamstring strain in accordance with cutoffs of isokinetic knee strength ratios. Bilateral, conventional, and functional isokinetic strength ratios were calculated in 194 professional soccer players at the beginning of 15 consecutive seasons...
April 4, 2017: Scandinavian Journal of Medicine & Science in Sports
https://www.readbyqxmd.com/read/28324151/higher-hamstring-to-quadriceps-isokinetic-strength-ratio-during-the-first-post-operative-months-in-patients-with-quadriceps-tendon-compared-to-hamstring-tendon-graft-following-acl-reconstruction
#14
Felix Fischer, Christian Fink, Elmar Herbst, Christian Hoser, Caroline Hepperger, Cornelia Blank, Peter Gföller
PURPOSE: The aim of this study was to compare isokinetic quadriceps and hamstring muscle strength in patients following anterior cruciate ligament (ACL) reconstruction who received either hamstring (HT) or quadriceps (QT) tendon autografts at two time intervals within the first year after surgery. METHODS: One hundred twenty-four patients, 81 males (age 22.0 ± 6.2 years) and 43 females (age 20.9 ± 8.7 years), participated in this study. ACL reconstruction was performed with either quadriceps tendon autografts (QT; n = 61) or hamstring tendon autografts (HT; n = 63)...
March 21, 2017: Knee Surgery, Sports Traumatology, Arthroscopy: Official Journal of the ESSKA
https://www.readbyqxmd.com/read/28268658/controlling-interfered-area-in-interferential-current-stimulation-by-electrode-area-patterning
#15
S Bounyong, S Adachi, T Yoshimoto, T Ota, J Ozawa
Interferential current therapy is a noninvasive therapy using simultaneously two or more medium-frequency currents passing through tissue. By controlling the interfered area of the current flows, selective stimulation is possible in target muscles, including deep muscles. However, controlling the interfered area or the intensity of the current precisely is still lacking. Using simulations based on a biological model of the thigh as well as electrical muscle stimulation (EMS) experiments, we investigated the influence of electrode area ratio in changing the interfered area of the currents...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28247210/age-related-effects-on-maximal-and-rapid-hamstrings-quadriceps-strength-capacities-and-vertical-jump-power-in-young-and-older-females
#16
Ty B Palmer, Brittany N Followay, Brennan J Thompson
BACKGROUND AND AIMS: Declines in hamstrings and quadriceps maximal and rapid strength are commonly reported as a consequence of aging; however, few studies have investigated the influence of age on maximal and rapid hamstrings to quadriceps (H/Q) strength ratios. This study aimed to examine the effects of age on leg extension and flexion maximal and rapid torque production, H/Q strength ratios, and muscle power in healthy, young and old females. METHODS: Fifteen young (21 ± 2 years) and 15 old (69 ± 7 years) females performed 3 isometric leg extension and flexion maximal voluntary contractions (MVCs), from which peak torque (PT), early (0-30 ms) and late (0-200 ms) phase rate of torque development (RTD), and PT and RTD H/Q strength ratios were extracted...
February 28, 2017: Aging Clinical and Experimental Research
https://www.readbyqxmd.com/read/28238153/the-role-of-thigh-muscular-efforts-in-limiting-sit-to-stand-capacity-in-healthy-young-and-older-adults
#17
Megan Bryanton, Martin Bilodeau
Aging is associated with an unavoidable decline in muscle mass, known as sarcopenia, leading to neuromuscular declines, muscle weakness, and subsequent disability. One particular measure utilized by rehabilitative professionals in evaluating functional declines in older persons is sit-to-stand (STS) capacity. The purpose of this investigation was to determine the role of activation intensity requirements of the thigh musculature in limiting a multi-joint STS endurance task. To do so, surface EMG signals of the quadriceps femoris (QF) and hamstrings (biceps femoris; BF) and their co-activation ratios (H:Q) were collected in young (18-35 years; n = 12) and older (60-75 years; n = 12) adult participants who repeatedly stood from a seated position until exhaustion...
February 25, 2017: Aging Clinical and Experimental Research
https://www.readbyqxmd.com/read/28226842/controlling-interfered-area-in-interferential-current-stimulation-by-electrode-area-patterning
#18
S Bounyong, S Adachi, T Yoshimoto, T Ota, J Ozawa, S Bounyong, S Adachi, T Yoshimoto, T Ota, J Ozawa, T Yoshimoto, T Ota, S Bounyong, J Ozawa, S Adachi
Interferential current therapy is a noninvasive therapy using simultaneously two or more medium-frequency currents passing through tissue. By controlling the interfered area of the current flows, selective stimulation is possible in target muscles, including deep muscles. However, controlling the interfered area or the intensity of the current precisely is still lacking. Using simulations based on a biological model of the thigh as well as electrical muscle stimulation (EMS) experiments, we investigated the influence of electrode area ratio in changing the interfered area of the currents...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28226296/the-relationship-between-external-knee-moments-and-muscle-co-activation-in-subjects-with-medial-knee-osteoarthritis
#19
Luiz Fernando Approbato Selistre, Stela Márcia Mattiello, Theresa Helissa Nakagawa, Glaucia Helena Gonçalves, Marina Petrella, Richard Keith Jones
PURPOSE: External knee moments are reliable to measure knee load but it does not take into account muscle activity. Considering that muscle co-activation increases compressive forces at the knee joint, identifying relationships between muscle co-activations and knee joint load would complement the investigation of the knee loading in subjects with knee osteoarthritis. The purpose of this study was to identify relationships between muscle co-activation and external knee moments during walking in subjects with medial knee osteoarthritis...
April 2017: Journal of Electromyography and Kinesiology
https://www.readbyqxmd.com/read/28222578/the-effects-of-prevent-injury-and-enhance-performance-program-in-a-female-soccer-team
#20
Cristina Rodríguez, Soledad Echegoyen, Takeshi Aoyama
BACKGROUND: The purpose of this study is to evaluate the changes of muscle strength in lower limbs and knee valgus alignment using the Prevent Injury and Enhance Performance Program (PEP program) to prevent ACL injuries in female soccer players during an entire season. METHODS: A longitudinal and prospective study was done in twenty female soccer players at the Universidad Nacional Autónoma de México, from a senior team. During 24 weeks the training program was applied three times a week as a part of the team workouts...
February 21, 2017: Journal of Sports Medicine and Physical Fitness
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