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hamstring/quadricep ratio

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https://www.readbyqxmd.com/read/28416087/the-impact-of-joint-angle-and-movement-velocity-on-sex-differences-in-the-functional-hamstring-quadriceps-ratio
#1
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
#2
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/sex-differences-in-high-school-athletes-knowledge-of-sport-related-concussion-symptoms-and-reporting-behaviors
#3
Jessica Wallace, Tracey Covassin, Erica Beidler
CONTEXT:   Recent researchers have reported that athletes' knowledge of sport-related concussion (SRC) has increased but that athletes still lack knowledge of all the signs and symptoms of SRC. Understanding the signs and symptoms of SRC and the dangers of playing while symptomatic are critical to reporting behaviors in high school athletes. OBJECTIVE:   To examine sex differences in knowledge of SRC symptoms and reasons for not reporting a suspected SRC to an authoritative figure in high school athletes...
April 18, 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
#4
Matheus Daros Pinto, Anthony J Blazevich, Lars L Andersen, Pedro Mil-Homens, Ronei Silveira 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 PURPOSE: To examine the influence of neuromuscular fatigue on the H:Q strength ratio and the association between fatigued and non-fatigued ratio scores, after the effect of different H:Q calculation methods were compared and contrasted METHODS: Thirty-five professional soccer players performed a 30-repetition isokinetic fatigue test protocol...
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
#5
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
#6
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
#7
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
#8
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
#9
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
#10
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
#11
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...
January 18, 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
#12
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
https://www.readbyqxmd.com/read/28217417/biomechanical-differences-in-brazilian-jiu-jitsu-athletes-the-role-of-combat-style
#13
Pedro Olavo de Paula Lima, Alane Almeida Lima, Anita Camila Sampaio Coelho, Yuri Lopes Lima, Gabriel Peixoto Leão Almeida, Márcio Almeida Bezerra, Rodrigo Ribeiro de Oliveira
BACKGROUND: Brazilian Jiu-Jitsu (BJJ) athletes can be divided into two combat styles: pass fighters (PFs) and guard fighters (GFs). Flexibility of the posterior chain muscles is highly necessary in these athletes, especially in GFs. On the other hand, isometric strength of the trunk extensors is required in PFs. Handgrip strength is important in holding the kimono of the opponent, and symmetrical lower-limb strength is important for the prevention of injuries due to the overload caused by training...
February 2017: International Journal of Sports Physical Therapy
https://www.readbyqxmd.com/read/28217412/exercises-that-facilitate-optimal-hamstring-and-quadriceps-co-activation-to-help-decrease-acl-injury-risk-in-healthy-females-a-systematic-review-of-the-literature
#14
Rachel Dedinsky, Lindsey Baker, Samuel Imbus, Melissa Bowman, Leigh Murray
BACKGROUND: Anterior cruciate ligament (ACL) injury is common among females due to many anatomic, hormonal, and neuromuscular risk factors. One modifiable risk factor that places females at increased risk of ACL injury is a poor hamstrings: quadriceps (H:Q) co-activation ratio, which should be 0.6 or greater in order to decrease the stress placed on the ACL. Exercises that produce more quadriceps dominant muscle activation can add to the tension placed upon the ACL, potentially increasing the risk of ACL injury...
February 2017: International Journal of Sports Physical Therapy
https://www.readbyqxmd.com/read/28174475/correlation-among-proprioception-muscle-strength-and-balance
#15
Huihui Wang, Zhongqiu Ji, Guiping Jiang, Weitong Liu, Xibian Jiao
[Purpose] To study the correlation among proprioception, muscle strength, and balance. [Subjects and Methods] A balance testing system (Biodex Balance System, BBS) and an isokinetic testing system (Biodex System 4, BS4) were used to test related indexes in 24 healthy young females. [Results] With the knee joint at 15 degree flexion, proprioception was significantly correlated with Limits of Stability-Time values, and was highly significantly correlated with Limits of Stability-Overall and Athlete Single Leg Medial/Lateral values...
December 2016: Journal of Physical Therapy Science
https://www.readbyqxmd.com/read/28174444/does-the-q-h-index-show-a-stronger-relationship-than-the-h-q-ratio-in-regard-to-knee-pain-during-daily-activities-in-patients-with-knee-osteoarthritis
#16
Remi Fujita, Yasumoto Matsui, Atsushi Harada, Marie Takemura, Izumi Kondo, Tetsuya Nemoto, Tadahiro Sakai, Hideki Hiraiwa, Susumu Ota
[Purpose] The purpose of this study was to elucidate the relationship between knee muscle strength and knee pain in activities of daily living, based on consideration of the difference between extension and flexion strength (Q - H) and the hamstring:quadriceps (H:Q) ratio in patients with knee osteoarthritis. [Subjects and Methods] The participants were 78 females with knee osteoarthritis, and a total of 133 knees that had not been treated surgically were the targets of this research. The legs were divided according to dominance...
December 2016: Journal of Physical Therapy Science
https://www.readbyqxmd.com/read/28149364/evaluating-injury-risk-in-first-and-second-league-professional-portuguese-soccer-muscular-strength-and-asymmetry
#17
Alberto Carvalho, Scott Brown, Eduardo Abade
Strength imbalances between the hamstrings and quadriceps are an essential predictor for hamstring strain in soccer. The study aimed to investigate and compare the muscle strength imbalances of professional soccer players of different performance levels. One hundred and fifty nine senior male professional soccer players from first (n = 75) and second league (n = 84) Portuguese clubs participated in this study. Muscle strength was evaluated with a REV9000 isokinetic dynamometer. Maximal peak torque data were used to calculate quadriceps and hamstrings strength during concentric and eccentric actions, bilateral asymmetry, conventional strength ratios and dynamic control ratios...
June 1, 2016: Journal of Human Kinetics
https://www.readbyqxmd.com/read/28060927/acute-effects-of-three-neuromuscular-warm-up-strategies-on-several-physical-performance-measures-in-football-players
#18
Francisco Ayala, Ana Calderón-López, Juan Carlos Delgado-Gosálbez, Sergio Parra-Sánchez, Carlos Pomares-Noguera, Sergio Hernández-Sánchez, Alejandro López-Valenciano, Mark De Ste Croix
No studies have analysed the acute effects of the FIFA 11+ and Harmoknee warm-up programmes on major physical performance measures. The aim of this study was to analyse the acute (post-exercise) effects of the FIFA 11+, Harmoknee and dynamic warm-up routines on several physical performance measures in amateur football players. A randomized, crossover and counterbalanced study design was used to address the purpose of this study. A total of sixteen amateur football players completed the following protocols in a randomized order on separate days: a) FIFA 11+; b) Harmoknee; and c) dynamic warm-up (DWU)...
2017: PloS One
https://www.readbyqxmd.com/read/27799671/comparison-of-hamstring-to-quadriceps-ratio-between-accelerating-and-decelerating-sections-during-squat-exercise
#19
Won-Gyu Yoo
[Purpose] The aim of this study was to compare hamstring-to-quadriceps ratio between the accelerating and decelerating sections for anterior cruciate ligament protection during squat exercise. [Subjects and Methods] Nine asymptomatic males were enrolled in this study. The hamstring (medial part) and quadriceps (rectus femoris) muscle activities during squat exercise were measured, and the squat exercises were classified into two sections (accelerating and decelerating) by using an accelerometer. [Results] The hamstring-to-quadriceps ratio was significantly higher in the decelerating section than in the accelerating section during the squat exercise...
September 2016: Journal of Physical Therapy Science
https://www.readbyqxmd.com/read/27676854/evolution-of-isokinetic-torque-ratios-of-shoulder-rotator-muscles
#20
Maryne Cozette, Stéphane Delanaud, Pierre-Marie Lepretre, Thierry Weissland
OBJECTIVE: Shoulder internal (IR) and external rotator (ER) muscles play an important role in the stability of glenohumeral joint. The ratio between the peak torque of ER and IR in concentric (ER/IRPT) and mixed (ER-ECC/IR-CONPT) are usually measured to evaluate the effects of muscle weakness, sport activities, injury and treatment (Greenfield et al., 1990; Scoville et al., 1997). However, ER/IRPT and ER-ECC/IR-CONPT failed to provide some indication on the evolution of the ER/IR torque ratio (ER/IRTorque) and mixed torque ratio (ER-EC/IR-COTorque) during the range of motion (ROM)...
September 2016: Annals of Physical and Rehabilitation Medicine
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