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Quadriceps activation

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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/29781580/neuromuscular-electrical-stimulation-compared-to-volitional-exercise-in-improving-muscle-function-in-rheumatoid-arthritis-a-randomized-pilot-study
#2
Sara R Piva, Samannaaz S Khoja, Frederico G S Toledo, Mary Chester Wasko, G Kelley Fitzgerald, Bret H Goodpaster, Clair N Smith, Anthony Delitto
OBJECTIVES: To compare the feasibility and effectiveness of Neuromuscular Electrical Stimulation (NMES) with high-intensity volitional resistance training in improving muscle structure and function, and physical function in patients with rheumatoid arthritis (RA). We also described pre- and post-intervention values of myocyte characteristics. METHODS: Two-group single-blinded pilot randomized study in adults with RA. Participants were assigned to 36 sessions over 16 weeks of NMES (n=31) or volitional training (n=28)...
May 21, 2018: Arthritis Care & Research
https://www.readbyqxmd.com/read/29775379/decision-to-return-to-sport-participation-after-anterior-cruciate-ligament-reconstruction-part-ii-self-reported-and-functional-performance-outcomes
#3
Jennifer L Werner, Julie P Burland, Carl G Mattacola, Jenny Toonstra, Robert A English, Jennifer S Howard
CONTEXT:   Anterior cruciate ligament (ACL) reconstruction (ACLR) is the most commonly used method for helping athletes regain function and return to preinjury activity levels after ACL injury. Outcomes after ACLR have suggested that athletes return to a level of function that would support a return to sport participation; however, in a recent meta-analysis, pooled return rates were only 55%. It is unclear whether this discrepancy is a result of functional impairments. OBJECTIVE:   To compare patient-reported outcomes (PROs), dynamic balance, dynamic functional performance, strength, and muscular endurance in athletes who have returned to sport (RTS) and athletes who have not returned to sport (NRTS) after ACLR...
May 18, 2018: Journal of Athletic Training
https://www.readbyqxmd.com/read/29769834/continuous-knee-cooling-affects-functional-hop-performance-a-randomized-controlled-trial
#4
Bruno Tassignon, Ben Serrien, Kevin De Pauw, Jean-Pierre Baeyens, Romain Meeusen
Cryotherapy is widely used in sports and rehabilitation to aid recovery and injury management. The purpose was to examine if a low temperature computer controlled continuous knee cooling protocol (10°C) for one hour and a moderate continuous knee cooling protocol (18°C) for one hour affected neuromuscular activity and functional performance tests. We used a randomized controlled study design. Twenty healthy male subjects (age = 24 ± 3 years) were included and randomized into 2 groups (10°C and 18°C). On day one, participants performed a maximal voluntary contraction of the quadriceps (MVC), single leg hop for distance (SLHD), and crossover hop for time (COHT) with both legs before and after cooling of their right leg...
June 2018: Journal of Sports Science & Medicine
https://www.readbyqxmd.com/read/29759662/nandrolone-decanoate-and-physical-activity-affect-quadriceps-in-peripubertal-rats
#5
Jasmina Sretenovic, Vladimir Ajdzanovic, Vladimir Zivkovic, Ivan Srejovic, Milena Corbic, Verica Milosevic, Vladimir Jakovljevic, Zoran Milosavljevic
Anabolic androgenic steroids (AASs) are synthetic analogs of testosterone often used by athletes to increase the skeletal muscle mass. Our goal was to examine the effects of physical activity and physical activity combined with supraphysiological doses of nandrolone on functional morphology of the quadriceps muscle. The study included 32 peripubertal Wistar rats, divided into 4 groups: control (T-N-), nandrolone (T-N+), physical activity (T+N-) and physical activity plus nandrolone (T+N+) groups. The T+N- and T+N+ group swam for 4 weeks, 1 h/day, 5 days/week...
May 11, 2018: Acta Histochemica
https://www.readbyqxmd.com/read/29740557/hip-and-trunk-muscles-activity-during-nordic-hamstring-exercise
#6
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/29731621/physical-inactivity-is-associated-with-decreased-growth-differentiation-factor-11-in-chronic-obstructive-pulmonary-disease
#7
Rie Tanaka, Hisatoshi Sugiura, Mitsuhiro Yamada, Tomohiro Ichikawa, Akira Koarai, Naoya Fujino, Satoru Yanagisawa, Katsuhiro Onodera, Tadahisa Numakura, Kei Sato, Yorihiko Kyogoku, Hirohito Sano, Shun Yamanaka, Tatsuma Okazaki, Tsutomu Tamada, Motohiko Miura, Tsuneyuki Takahashi, Masakazu Ichinose
Background: Growth differentiation factor 11 (GDF11) is reported to possess anti-aging and rejuvenating effects, including muscle regeneration and to be highly expressed in skeletal muscle. Recently, we demonstrated that the levels of plasma GDF11 were decreased in COPD. However, the effect of decreased circulating GDF11 in the pathophysiology of COPD remains unknown. The aim of this study is to investigate the association between the plasma GDF11 levels and various clinical parameters in patients with COPD...
2018: International Journal of Chronic Obstructive Pulmonary Disease
https://www.readbyqxmd.com/read/29725506/comparison-of-adductor-canal-block-versus-local-infiltration-analgesia-on-postoperative-pain-and-functional-outcome-after-total-knee-arthroplasty-a-randomized-controlled-trial
#8
W Kampitak, A Tanavalee, S Ngarmukos, C Amarase, B Songthamwat, A Boonshua
Introduction: Total knee arthroplasty (TKA) is associated with intense postoperative pain for which effective analgesia is essential to facilitate early postoperative recovery. Adductor canal block (ACB) and local infiltration analgesia (LIA) have become increasingly involved in postoperative pain management after TKA. We aimed to compare their efficacy and outcomes in patients undergoing TKA. Materials and Methods: Sixty patients undergoing unilateral TKA were randomized to receive either postoperative single-injection ACB (Group A) or LIA (Group L) during the operation...
March 2018: Malaysian Orthopaedic Journal
https://www.readbyqxmd.com/read/29722622/blood-flow-occlusion-related-o-2-extraction-reserve-is-present-in-different-muscles-of-the-quadriceps-but-greater-in-deeper-regions-after-ramp-incremental-test
#9
Danilo Iannetta, Dai Okushima, Erin Calaine Inglis, Narihiko Kondo, Juan M Murias, Shunsaku Koga
It was recently demonstrated that an O2 extraction reserve, as assessed by the near-infrared spectroscopy (NIRS)-derived deoxygenation signal ([HHb]), exists in the superficial region of vastus lateralis (VL) muscle during an occlusion performed at the end of a ramp-incremental test. However, it is unknown whether this reserve is present and/or different in magnitude in other portions and depths of the quadriceps muscles. We tested the hypothesis that O2 extraction would exist in other regions of this muscle but greater in deep compared to more superficial portions...
May 3, 2018: Journal of Applied Physiology
https://www.readbyqxmd.com/read/29721606/the-effects-of-different-durations-of-static-stretching-within-a-comprehensive-warm-up-on-voluntary-and-evoked-contractile-properties
#10
Jonathan C Reid, Rebecca Greene, James D Young, Daniel D Hodgson, Anthony J Blazevich, David G Behm
Evidence for performance decrements following prolonged static stretching (SS) has led to a paradigm shift in stretching routines within a warm-up. Rather than SS, dynamic stretching (DS) and dynamic activity (DA) have replaced SS within warm-up routines. The objective of the present study was to compare the effect of differing lower limb SS durations (30 [SS30s], 60 [SS60s] or 120 s [SS120s] of SS per muscle group or no-stretch control) within a comprehensive warm-up protocol consisting of aerobic activity, DS and DA...
May 2, 2018: European Journal of Applied Physiology
https://www.readbyqxmd.com/read/29706723/electromyographic-activity-of-selected-trunk-core-and-thigh-muscles-in-commonly-used-exercises-for-acl-rehabilitation
#11
Omid A Khaiyat, Jessica Norris
[Purpose] Most of rehabilitation programmes for Anterior Cruciate Ligament (ACL) injury focus on quadriceps-hamstrings activation imbalances and less is known about kinetically linked muscles. This study investigated electromyographic activity of selected trunk, core, and thigh muscles during common rehabilitation exercises for ACL injury. [Subjects and Methods] Twelve active female volunteers participated in this cross-sectional laboratory study. Surface EMG was used to compare activation of eight trunk, hip/core, and lower limb muscles: Erector Spinae (ES), Rectus Abdominis (RA), Gluteus Maximus (GM), Vastus Lateralis (VL), Rectus Femoris (RF), Vastus Medialis (VM), Biceps Femoris (BF), and Semitendinosus (ST) during Forward Lunge, Double Leg Raise, Glute Bridge, Sit-Up, and Squat...
April 2018: Journal of Physical Therapy Science
https://www.readbyqxmd.com/read/29706702/does-the-relative-muscle-activation-of-the-vastus-medialis-rectus-femoris-and-vastus-lateralis-during-the-various-activities-change-in-relation-to-the-quadriceps-angle
#12
Nakyung Lee
[Purpose] The purpose of this study was to examine the correlation between the quadriceps angle and muscle-activation ratios for the vastus medialis, rectus femoris, and vastus lateralis during various activities. [Subjects and Methods] Seventeen heathy females were recruited. The quadriceps angles were measured with long-arm goniometers. The muscle activity of the vastus medialis, rectus femoris, and vastus lateralis were measured using electromyography under four different activity settings: walking, squatting, step-up, and sit-to-stand...
April 2018: Journal of Physical Therapy Science
https://www.readbyqxmd.com/read/29698291/csa-90-promotes-bone-formation-and-mitigates-methicillin-resistant-staphylococcus-aureus-infection-in-a-rat-open-fracture-model
#13
Rebecca Mills, Tegan L Cheng, Kathy Mikulec, Lauren Peacock, David Isaacs, Carl Genberg, Paul B Savage, David G Little, Aaron Schindeler
BACKGROUND: Infection of open fractures remains a significant cause of morbidity and mortality to patients worldwide. Early administration of prophylactic antibiotics is known to improve outcomes; however, increasing concern regarding antimicrobial resistance makes finding new compounds for use in such cases a pressing area for further research. CSA-90, a synthetic peptidomimetic compound, has previously demonstrated promising antimicrobial action against Staphylococcus aureus in rat open fractures...
April 24, 2018: Clinical Orthopaedics and related Research
https://www.readbyqxmd.com/read/29687898/neuromuscular-fatigue-after-low-and-medium-frequency-electrical-stimulation-in-healthy-adults
#14
Pedro Ferreira Alves de Oliveira, João Luiz Quagliotti Durigan, Karenina Arrais Guida Modesto, Martim Bottaro, Nicolas Babault
INTRODUCTION: We studied fatigue origins induced by low-frequency pulsed current (PC) and medium frequency current (MF) neuromuscular electrical stimulation (NMES) after a clinical-like session. METHODS: Eleven healthy men randomly underwent 2 NMES sessions, PC and MF, on quadriceps muscle (15-min duration, 6-s on and 18-s off). Maximal voluntary contraction (MVC), central activation ratio (CAR), vastus lateralis electromyographic activity (EMG) and evoked contractile properties were determined before and after sessions...
April 17, 2018: Muscle & Nerve
https://www.readbyqxmd.com/read/29683914/different-patterns-in-muscular-strength-and-hypertrophy-adaptations-in-untrained-individuals-undergoing-nonperiodized-and-periodized-strength-regimens
#15
Eduardo O De Souza, Valmor Tricoli, Jacob Rauch, Michael R Alvarez, Gilberto Laurentino, André Y Aihara, Fabiano N Cardoso, Hamilton Roschel, Carlos Ugrinowitsch
De Souza, EO, Tricoli, V, Rauch, J, Alvarez, MR, Laurentino, G, Aihara, AY, Cardoso, FN, Roschel, H, and Ugrinowitsch, C. Different patterns in muscular strength and hypertrophy adaptations in untrained individuals undergoing non-periodized and periodized strength regimens. J Strength Cond Res 32(5): 1238-1244, 2018-This study investigated the effects of nonperiodized (NP), traditional periodization (TP), and daily undulating periodization (UP) regimens on muscle strength and hypertrophy in untrained individuals...
May 2018: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/29682378/simultaneous-bilateral-quadriceps-tendon-rupture-in-a-patient-with-diffuse-idiopathic-skeletal-hyperostosis-after-minimal-trauma-eight-year-follow-up
#16
Sevan Sıvacıoğlu, Ahmet Salduz, Ufuk Öztürk, Serkan Bayram, Fevzi Birişik
Introduction: The purpose of this report was to describe a very rare case of simultaneous bilateral quadriceps tendon rupture seen in a patient who was diagnosed as having diffuse idiopathic skeletal hyperostosis. Case Presentation: A man aged 64 years presented to the emergency department with bilateral quadriceps tendon rupture. Surgical repair was performed with suture anchors and a stainless steel cable. His legs were immobilized in casts for six weeks. After removal of the casts, physiotherapy was started...
2018: Case Reports in Orthopedics
https://www.readbyqxmd.com/read/29680779/effects-of-localized-vibration-on-knee-joint-position-sense-in-individuals-with-anterior-cruciate-ligament-reconstruction
#17
Takashi Nagai, Nathaniel A Bates, Timothy E Hewett, Nathan D Schilaty
BACKGROUND: Anterior cruciate ligament injury can disrupt one's mechanoreceptors and result in decreased proprioception such as joint position sense and ultimately altered motor function. The application of localized vibration has been used to investigate the integrity of the sensorimotor system and the mechanisms of quadriceps function after anterior cruciate ligament injury and reconstruction. The purpose of the study is to evaluate joint position sense with and without vibration and compare among anterior cruciate ligament reconstructed, contralateral, and control limbs...
April 14, 2018: Clinical Biomechanics
https://www.readbyqxmd.com/read/29672352/association-of-activities-of-daily-living-with-the-load-during-step-ascent-motion-in-nursing-home-residing-elderly-individuals
#18
Mitsuhiro Masaki, Tome Ikezoe, Midori Kamiya, Kojiro Araki, Ryo Isono, Takehiro Kato, Ken Kusano, Masayo Tanaka, Syunsuke Sato, Tetsuya Hirono, Kiyoshi Kita, Tadao Tsuboyama, Noriaki Ichihashi
OBJECTIVE: This study aimed to examine the association of independence in ADL with the loads during step ascent motion and other motor functions in 32 nursing home-residing elderly individuals. DESIGN: Independence in ADL was assessed by using the functional independence measure (FIM). The loads at the upper (i.e., pulling up) and lower (i.e., pushing up) levels during step ascent task was measured on a step ascent platform. Hip extensor, knee extensor, plantar flexor muscle, and quadriceps setting strengths; lower extremity agility using the stepping test; and hip and knee joint pain severities were measured...
April 19, 2018: American Journal of Physical Medicine & Rehabilitation
https://www.readbyqxmd.com/read/29670495/impact-of-pilates-exercise-in-multiple-sclerosis-a-randomized-controlled-trial
#19
Whitney R D Duff, Justin W Andrushko, Doug W Renshaw, Philip D Chilibeck, Jonathan P Farthing, Jana Danielson, Charity D Evans
Background: Pilates is a series of exercises based on whole-body movement and may improve mobility in people with multiple sclerosis (MS). The purpose of this study was to determine the effect of Pilates on walking performance in people with MS. Methods: 30 individuals with MS who were not restricted to a wheelchair or scooter (Patient-Determined Disease Steps scale score <7) were randomized to receive Pilates (twice weekly) and massage therapy (once weekly) or once-weekly massage therapy only (control group)...
March 2018: International Journal of MS Care
https://www.readbyqxmd.com/read/29668632/outcomes-of-using-a-modified-anteromedial-thigh-perforator-flap-for-repairing-the-anterolateral-thigh-free-flap-donor-site-a-retrospective-clinical-review
#20
Xiao Zhou, Jin Wang, Li Qiang, Yongjun Rui, Mingyu Xue
The anterolateral thigh (ALT) flap plays an essential part in plastic and reconstructive surgery. However, repair of the anterolateral donor site has not been the focus of the clinicians.To assess the clinical value and feasibility of using a modified anteromedial thigh (AMT) perforator flap for repairing the ALT free flap donor site.In this retrospective study, 16 ALT flaps were transferred to resurface large soft-tissue defects (ranged from 7 × 5 to 13 × 8 cm) in the foot or hand from June 2012 to March 2013...
April 2018: Medicine (Baltimore)
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