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https://www.readbyqxmd.com/read/29870422/muscle-activation-in-unilateral-barbell-exercises-implications-for-strength-training-and-rehabilitation
#1
Lasse Mausehund, Audun E Skard, Tron Krosshaug
Mausehund, L, Skard, AE, and Krosshaug, T. Muscle activation in unilateral barbell exercises: Implications for strength training and rehabilitation. J Strength Cond Res XX(X): 000-000, 2018-The purpose of the present investigation was to assess lower-body muscle activity and hamstrings-to-quadriceps (HQ) activation ratios during performance of the split squat (SS), single-leg squat (SLS), and rear foot elevated split squat (RFESS), while using the same relative load and performing the exercises to muscular failure...
June 4, 2018: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/29796082/towards-subject-specific-strength-training-design-through-predictive-use-of-musculoskeletal-models
#2
Michael Plüss, Florian Schellenberg, William R Taylor, Silvio Lorenzetti
Lower extremity dysfunction is often associated with hip muscle strength deficiencies. Detailed knowledge of the muscle forces generated in the hip under specific external loading conditions enables specific structures to be trained. The aim of this study was to find the most effective movement type and loading direction to enable the training of specific parts of the hip muscles using a standing posture and a pulley system. In a novel approach to release the predictive power of musculoskeletal modelling techniques based on inverse dynamics, flexion/extension and ab-/adduction movements were virtually created...
2018: Applied Bionics and Biomechanics
https://www.readbyqxmd.com/read/29786622/quantitative-analysis-of-proximal-and-distal-kinetic-chain-musculature-during-dynamic-exercises
#3
Gretchen D Oliver, Jessica K Washington, Jeff W Barfield, Sarah S Gascon, Gabrielle Gilmer
Oliver, GD, Washington, JK, Barfield, JW, Gascon, SS, and Gilmer, G. Quantitative analysis of proximal and distal kinetic chain musculature during dynamic exercises. J Strength Cond Res 32(6): 1545-1553, 2018-Proximal to distal sequencing for the dynamic movement of throwing is dependent on the movement and stability of the lumbopelvic-hip complex (LPHC) and scapula. Although the need for proximal stability for distal mobility has been vastly documented, pre-throwing programs tend to focus on the traditional rotator cuff activation exercises before long toss...
June 2018: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/29761113/differences-in-hip-joint-biomechanics-and-muscle-activation-in-individuals-with-femoroacetabular-impingement-compared-with-healthy-asymptomatic-individuals-is-level-ground-gait-analysis-enough
#4
Derek J Rutherford, Janice Moreside, Ivan Wong
Background: Femoroacetabular impingement (FAI) is a recognized cause of hip and groin pain and a significant factor in hip joint function during sport. Objective tests for understanding hip function are lacking in this population. Purpose: To determine whether biomechanical and electromyographic features of hip function during level-ground walking differ between a group diagnosed with FAI and those with no symptoms of FAI. Study Design: Controlled laboratory study...
May 2018: Orthopaedic Journal of Sports Medicine
https://www.readbyqxmd.com/read/29705465/trunk-and-hip-muscle-activation-during-yoga-poses-do-sex-differences-exist
#5
Lori A Bolgla, Leonard Amodio, Kristen Archer, Jillian Estes, Rachelle Leung, Katherine Magoni, Alyssa Mullikin, Dylan Roberts, Mekenzie Weems, Debra Beazley
OBJECTIVE: To compare core activation during yoga between males and females. METHODS: Surface electromyography was used to quantify rectus abdominis (RA), abdominal obliques (AO), lumbar extensors (LE), and gluteus maximus (GMX) activation during four yoga poses. Data were expressed as 100% of a maximum voluntary isometric contraction. Mixed-model 2 × 2 analyses of variance with repeated measures were used to determine between-sex differences in muscle activity...
May 2018: Complementary Therapies in Clinical Practice
https://www.readbyqxmd.com/read/29705166/differences-in-knee-and-hip-adduction-and-hip-muscle-activation-in-runners-with-and-without-iliotibial-band-syndrome
#6
Robert L Baker, Richard B Souza, Mitchell J Rauh, Michael Fredericson, Michael D Rosenthal
BACKGROUND: Iliotibial band syndrome has been associated with altered hip and knee kinematics in runners. Previous studies have recommended further research on neuromuscular factors at the hip. The frontal plane hip muscles have been a strong focus in strength comparison but not for electromyography investigation. OBJECTIVE: To compare hip surface electromyography, and frontal plane hip and knee kinematics, in runners with and without iliotibial band syndrome. DESIGN: Observational cross-sectional study...
April 26, 2018: PM & R: the Journal of Injury, Function, and Rehabilitation
https://www.readbyqxmd.com/read/29669167/scoliosis-in-fibrous-dysplasia-mccune-albright-syndrome-factors-associated-with-curve-progression-and-effects-of-bisphosphonates
#7
Jason A Berglund, Sri Harsha Tella, Kaitlyn F Tuthill, Lauren Kim, Lori C Guthrie, Scott M Paul, Robert Stanton, Michael T Collins, Alison M Boyce
Scoliosis is a complication of fibrous dysplasia/McCune-Albright syndrome (FD/MAS); however, risk factors and long-term outcomes are unknown. Bisphosphonates are commonly used; however, it is unknown whether their use decrease the risk of progressive scoliosis. Clinical data from the National Institutes of Health (NIH) cohort study was reviewed. Cobb angles were measured, and variables associated with scoliosis progression were identified. Of 138 subjects with available radiographs, 84 (61%) had scoliosis, including 55 (65%) classified as mild (Cobb angle >10 to ≤30 degrees), 11 (13%) as moderate (>30 to ≤45 degrees), and 18 (22%) as severe (>45 degrees)...
April 18, 2018: Journal of Bone and Mineral Research: the Official Journal of the American Society for Bone and Mineral Research
https://www.readbyqxmd.com/read/29644392/effect-of-a-rest-pause-vs-traditional-squat-on-electromyography-and-lifting-volume-in-trained-women
#8
John A Korak, Max R Paquette, Dana K Fuller, Jennifer L Caputo, John M Coons
PURPOSE: Rest-pause (4 s unloaded rest between repetitions) single session training effects on lifting volume, and muscle activity via electromyography (EMG) are currently vague in the literature and can benefit strength and conditioning professionals for resistance training program design. This study compared differences in volume lifted and muscle activity between a rest-pause vs. traditional protocol. METHODS: Trained females (N = 13) completed both a rest-pause and traditional squat protocol consisting of four sets to movement failure at 80% pretest 1 repetition maximum load with 2-min rest between sets...
April 11, 2018: European Journal of Applied Physiology
https://www.readbyqxmd.com/read/29622256/editorial-commentary-treatment-of-partial-thickness-undersurface-abductor-tears-of-the-hip-like-backwards-a-bike-riding
#9
EDITORIAL
Derek Ochiai
Partial thickness undersurface abductor tears can be effectively treated with a transtendinous gluteus medius and minimus repair, with decreased pain and improvement in abductor strength. The surgical treatment of this condition runs counter to traditional treatment for "greater trochanteric bursitis," and adoption may be more difficult as a result.
April 2018: Arthroscopy: the Journal of Arthroscopic & related Surgery
https://www.readbyqxmd.com/read/29554437/does-greater-trochanter-decortication-affect-suture-anchor-pullout-strength-in-abductor-tendon-repairs-a-biomechanical-study
#10
Jill G Putnam, Anikar Chhabra, Paulo Castañeda, J Brock Walker, Collin C Barber, James A Lendrum, David E Hartigan
BACKGROUND: Greater trochanter decortication is frequently performed at the time of abductor tendon repair to theoretically increase healing potential. No previous studies have determined the effect that greater trochanter decortication has on the pullout strength of suture anchors. Hypothesis/Purpose: The purpose of this study is to determine whether greater trochanter decortication and bone mineral density affect suture anchor pullout strength in abductor tendon repair. The authors hypothesize that both will have a significant detrimental effect on suture anchor pullout strength...
March 1, 2018: American Journal of Sports Medicine
https://www.readbyqxmd.com/read/29484248/strengthening-the-gluteus-maximus-in-subjects-with-sacroiliac-dysfunction
#11
Marco Aurélio N Added, Diego G de Freitas, Karina T Kasawara, Robroy L Martin, Thiago Y Fukuda
Study design: Case series. Background and purpose: The literature has emphasized the use of exercise as an intervention for individuals with lumbopelvic pain. However, there is limited information to guide clinicians in exercise selection for those with sacroiliac (SI) joint dysfunction. Altered function of the gluteus maximus has been found in those with SI joint dysfunction. The objective of this case series was to assess the effectiveness of an exercise program directed at increasing gluteus maximus strength in those with clinical tests positive for SI joint dysfunction...
February 2018: International Journal of Sports Physical Therapy
https://www.readbyqxmd.com/read/29484243/maximal-hip-and-knee-muscle-strength-are-not-related-to-neuromuscular-pre-activity-during-sidecutting-maneuver-a-cross-sectional-study
#12
Rasmus S Husted, Jesper Bencke, Per Hölmich, Lars L Andersen, Kristian Thorborg, Thomas Bandholm, Bjørn Gliese, Hanne B Lauridsen, Grethe Myklebust, Per Aagaard, Mette K Zebis
Background: Reduced lower extremity muscle strength as well as reduced lower extremity muscle pre-activity (defined as muscular activity just prior to initial ground contact) during high-risk movements are factors related to increased risk of non-contact ACL injury in adolescent female athletes. A strong relationship exists between muscle strength and muscle activity obtained during an isometric contraction, however, whether these two measures are related when muscle activity is obtained during a movement associated with a high risk of non-contact ACL injury is not known...
February 2018: International Journal of Sports Physical Therapy
https://www.readbyqxmd.com/read/29465608/muscle-activation-patterns-of-lower-body-musculature-among-three-traditional-lower-body-exercises-in-trained-women
#13
Max R Paquette, Dana K Fuller, Jennifer L Caputo, John M Coons
The deadlift and back and front squats are common multi-joint, lower body resistance exercises that target similar musculature. To our knowledge, muscle activity measured via surface electromyography (EMG) has never been analyzed among these three exercises. Furthermore, most literature examining this topic has included male participants creating a void in the literature for the female population. Knowledge of lower body muscle activation among these three exercises can aid coaches, trainers, and therapists for training and rehabilitative purposes...
February 15, 2018: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/29446121/atrophy-of-hip-abductor-muscles-is-related-to-clinical-severity-in-a-hip-osteoarthritis-population
#14
Anita Zacharias, Rodney A Green, Adam Semciw, Daniel J English, Theo Kapakoulakis, Tania Pizzari
Osteoarthritis mainly affects weight-bearing joints such as the hip and knee and is the most common form of arthritis. Greater muscle atrophy with fatty infiltration of gluteal muscles and decreased hip abduction strength has previously been identified with increasing severity of radiological hip OA. However, it is well documented that radiographic findings of OA do not always correlate with clinical severity. The aim of this secondary analysis was to examine whether atrophy and strength of gluteus maximus (GMax), medius (GMed), minimus (GMin), and tensor fascia lata (TFL) is associated with the clinical severity of OA...
May 2018: Clinical Anatomy
https://www.readbyqxmd.com/read/29445330/non-neural-muscle-weakness-has-limited-influence-on-complexity-of-motor-control-during-gait
#15
Marije Goudriaan, Benjamin R Shuman, Katherine M Steele, Marleen Van den Hauwe, Nathalie Goemans, Guy Molenaers, Kaat Desloovere
Cerebral palsy (CP) and Duchenne muscular dystrophy (DMD) are neuromuscular disorders characterized by muscle weakness. Weakness in CP has neural and non-neural components, whereas in DMD, weakness can be considered as a predominantly non-neural problem. Despite the different underlying causes, weakness is a constraint for the central nervous system when controlling gait. CP demonstrates decreased complexity of motor control during gait from muscle synergy analysis, which is reflected by a higher total variance accounted for by one synergy (tVAF1 )...
2018: Frontiers in Human Neuroscience
https://www.readbyqxmd.com/read/29410579/relationship-between-hamstring-length-and-gluteus-maximus-strength-with-and-without-normalization
#16
Dong-Kyu Lee, Jae-Seop Oh
[Purpose] This study assessed the relationship between hamstring length and gluteus maximus (GM) strength with and without normalization by body weight and height. [Subjects and Methods] In total, 34 healthy male subjects volunteered for this study. To measure GM strength, subjects performed maximal hip joint extension with the knee joints flexed to 90° in the prone position. GM strength was normalized for body weight and height. [Results] GM strength with normalization was positively correlated with hamstring length, whereas GM strength without normalization was negatively correlated with hamstring length...
January 2018: Journal of Physical Therapy Science
https://www.readbyqxmd.com/read/29410557/effect-of-limbering-up-of-the-muscles-attached-to-the-pelvis-on-the-strength-of-upper-and-lower-extremity-and-trunk-muscles-through-the-transitional-network
#17
Yuichi Azuma, Toyoko Asami, Masayoshi Ichiba, Shinichiro Oka, Hisayoshi Yoshizuka
[Purpose] To study the effect that limbering up of the muscles attached to the pelvis has on muscle strength of the trunk and upper and lower extremities, which are not being exercised, and to investigate the possibilities for clinical application. [Subjects and Methods] A total of 152 healthy adult men. Sthenometry was conducted using a handheld dynamometer to assess the effect of limbering up of the upper gluteus maximus, hamstrings, and internal abdominal oblique muscles attached to thoracolumbar fascia on the trunk and upper and lower extremities...
January 2018: Journal of Physical Therapy Science
https://www.readbyqxmd.com/read/29385003/lower-extremity-strength-and-recovery-time-in-youth-baseball-pitchers-a-pilot-study
#18
Jennifer L Livingston, Nicholas M Tavoukjian
The purpose of this study was to investigate the Little League pitching regulations by measuring the change in lower extremity force production after a pitching performance and the subsequent days of rest required for youth baseball pitchers to recover. Bilateral manual muscle testing of the gluteus maximus, hamstrings, gluteus medius, triceps surae, and quadriceps was conducted using a handheld dynamometer. Fifteen healthy, youth baseball pitchers (9.80 ± 1.08 years) threw a submaximal number of pitches and were tested prior to, immediately after, and for the next four consecutive days...
January 29, 2018: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/29349712/highly-favorable-physiological-responses-to-concurrent-resistance-and-high-intensity-interval-training-during-chemotherapy-the-optitrain-breast-cancer-trial
#19
Sara Mijwel, Malin Backman, Kate A Bolam, Emil Olofsson, Jessica Norrbom, Jonas Bergh, Carl Johan Sundberg, Yvonne Wengström, Helene Rundqvist
BACKGROUND: Advanced therapeutic strategies are often accompanied by significant adverse effects, which warrant equally progressive countermeasures. Physical exercise has proven an effective intervention to improve physical function and reduce fatigue in patients undergoing chemotherapy. Effects of high-intensity interval training (HIIT) in this population are not well established although HIIT has proven effective in other clinical populations. The aim of the OptiTrain trial was to examine the effects of concurrent resistance and high-intensity interval training (RT-HIIT) or concurrent moderate-intensity aerobic and high-intensity interval training (AT-HIIT), to usual care (UC) on pain sensitivity and physiological outcomes in patients with breast cancer during chemotherapy...
May 2018: Breast Cancer Research and Treatment
https://www.readbyqxmd.com/read/29305287/endoscopic-repair-of-partial-thickness-undersurface-tears-of-the-abductor-tendon-clinical-outcomes-with-minimum-2-year-follow-up
#20
David E Hartigan, Itay Perets, Sherwin W Ho, John P Walsh, Leslie C Yuen, Benjamin G Domb
PURPOSE: To report the minimum 2-year outcomes of transtendinous repair of partial-thickness undersurface tears of the abductor tendon using patient-reported outcomes (PROs), visual analog scale (VAS) scores, and patient satisfaction scores. METHODS: All patients who underwent endoscopic transtendinous gluteus medius repair between October 2009 and May 2013 at 1 institution were prospectively evaluated. The exclusion criteria consisted of less than 2 years' follow-up, previous hip surgery, inflammatory arthritis, open surgery, full-thickness abductor tear, and Workers' Compensation patients...
April 2018: Arthroscopy: the Journal of Arthroscopic & related Surgery
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