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Quadriceps activation

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https://www.readbyqxmd.com/read/27930445/motion-and-muscle-activity-are-affected-by-instability-location-during-a-squat-exercise
#1
Brian C Nairn, Chad A Sutherland, Janessa D M Drake
Squat exercise training using instability devices have become increasingly popular for a multitude of reasons. Many devices generate instability at the feet and provide a bottom-up perturbation; however, the effect of a top-down instability device during a squat remains unclear. In order to induce instability at the upper body, a water-filled cylinder called the Attitube® was used. This study analyzed the effects of instability location (top-down, bottom-up, no instability) during a squat exercise in terms of kinematics and muscle activation...
November 19, 2016: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/27929469/the-colon-26-carcinoma-tumor-bearing-mouse-as-a-model-for-the-study-of-cancer-cachexia
#2
Andrea Bonetto, Joseph E Rupert, Rafael Barreto, Teresa A Zimmers
Cancer cachexia is the progressive loss of skeletal muscle mass and adipose tissue, negative nitrogen balance, anorexia, fatigue, inflammation, and activation of lipolysis and proteolysis systems. Cancer patients with cachexia benefit less from anti-neoplastic therapies and show increased mortality(1). Several animal models have been established in order to investigate the molecular causes responsible for body and muscle wasting as a result of tumor growth. Here, we describe methodologies pertaining to a well-characterized model of cancer cachexia: mice bearing the C26 carcinoma(2-4)...
November 30, 2016: Journal of Visualized Experiments: JoVE
https://www.readbyqxmd.com/read/27923983/sex-differences-in-function-and-structure-of-the-quadriceps-muscle-in-chronic-obstructive-pulmonary-disease-patients
#3
Pilar Ausín, Juana Martínez-Llorens, Marina Sabaté-Bresco, Carme Casadevall, Esther Barreiro, Joaquim Gea
Chronic obstructive pulmonary disease (COPD) is a complex disorder with extrapulmonary manifestations. Even though there is some knowledge regarding sex differences in the lung disease, little is known about extrapulmonary manifestations. Our aim was to analyze the specific profile of muscle dysfunction, structure, and biology in COPD women. Twenty-one women and 19 men with stable COPD as well as 15 controls were included. Nutritional status, physical activity, lung and muscle function, exercise capacity, and quality of life were assessed...
December 6, 2016: Chronic Respiratory Disease
https://www.readbyqxmd.com/read/27899540/the-1-minute-sit-to-stand-test-in-adults-with-cystic-fibrosis-correlations-with-cardiopulmonary-exercise-test-6-minute-walk-test-and-quadriceps-strength
#4
Mathieu Gruet, Leonardo Alexandre Peyré-Tartaruga, Laurent Mely, Jean-Marc Vallier
BACKGROUND: Exercise testing is part of the regular assessment of patients with cystic fibrosis (CF). We aimed to evaluate (1) the convergent validity of the 1-min sit-to-stand (STS) test in CF by investigating its relationships with peak oxygen uptake (peak V̇O2 ), quadriceps strength, and quality of life and (2) to compare these associations with those of the 6-min walk test (6MWT). METHODS: Twenty-five adults with CF (FEV1 = 59 ± 24%) performed the STS test, the 6MWT, quadriceps strength assessment, and cardiopulmonary exercise test (CPET)...
December 2016: Respiratory Care
https://www.readbyqxmd.com/read/27896586/effect-of-berberine-on-the-ratio-of-high-molecular-weight-adiponectin-to-total-adiponectin-and-adiponectin-receptors-expressions-in-high-fat-diet-fed-rats
#5
Yue-Yue Wu, Ying Zha, Jun Liu, Fang Wang, Jiong Xu, Zao-Ping Chen, He-Yuan Ding, Li Sheng, Xiao-Jie Han
OBJECTIVE: To assess the effects of berberine (BBR) on high-molecular weight (HMW) adiponectin and adiponectin receptors (adipoR1/adipoR2) expressions in high-fat (HF) diet fed rats. METHODS: Forty Wistar male rats were randomly assigned into a normal diet fed group and three HF diet (fat for 45% calories) fed groups (n=10 for each group). All rats underwent 12 weeks of feeding. After 4 weeks feeding, rats in the two of three HF diet fed groups were treated with 150 mg·kg(-1)·day(-1) BBR (HF+LBBR group) and 380 mg·kg(-1)·day(-1) BBR (HF+HBBR group) by gavage once a day respectively for the next 8 weeks while the rats in other groups treated with vehicle (NF+Veh and HF+Veh)...
November 17, 2016: Chinese Journal of Integrative Medicine
https://www.readbyqxmd.com/read/27894727/factors-associated-with-gait-speed-recovery-after-total-knee-arthroplasty-a-longitudinal-study
#6
Yong-Hao Pua, Felicia Jie-Ting Seah, Ross Allan Clark, Cheryl Lian-Li Poon, John Wei-Ming Tan, Hwei-Chi Chong
OBJECTIVES: Gait speed limitations can remain significant issues after a total knee arthroplasty (TKA) but their associated factors are not well understood. This study aimed to identify the factors associated with acute gait speed recovery post-TKA. METHODS: We performed a prospective longitudinal study of 1765 patients who underwent primary TKA between July 2013 and July 2015. At 4, 8, 12, and 16 weeks postsurgery, fast gait speed was measured. The factors associated with gait speed over time since TKA were identified using multivariable generalized least squares modeling...
November 1, 2016: Seminars in Arthritis and Rheumatism
https://www.readbyqxmd.com/read/27894177/variability-of-measurement-of-patellofemoral-indices-with-knee-flexion-and-quadriceps-contraction-an-mri-based-anatomical-study
#7
Edward Laugharne, Navi Bali, Sanjay Purushothamdas, Faris Almallah, Rik Kundra
Purpose: The purpose of this study was to investigate the impact of varying knee flexion and quadriceps activity on patellofemoral indices measured on magnetic resonance imaging (MRI). Materials and Methods: MRI of the knee was performed in 20 patients for indications other than patellar or patellofemoral pathology. Axial and sagittal sequences were performed in full extension of the knee with the quadriceps relaxed, full extension of the knee with the quadriceps contracted, 30° flexion of the knee with the quadriceps relaxed, and 30° flexion with the quadriceps contracted...
December 1, 2016: Knee Surgery & related Research
https://www.readbyqxmd.com/read/27866347/effect-of-low-intensity-resistance-training-with-heat-stress-on-the-hsp72-anabolic-hormones-muscle-size-and-strength-in-elderly-women
#8
Sung Jin Yoon, Moon Jin Lee, Hyo Min Lee, Jin Seok Lee
BACKGROUND: Several recent studies have reported that heat stress stimulates the activation of heat shock protein 72 (HSP72), leading to an increase in muscle synthesis. Some studies suggested that low-intensity resistance training combined with heat stress could improve muscle size and strength. AIM: This study aimed to identify the effect of low-intensity resistance training with heat stress over 12 weeks on the HSP72, anabolic hormones, muscle size, and strength in elderly women...
November 19, 2016: Aging Clinical and Experimental Research
https://www.readbyqxmd.com/read/27856557/activating-transcription-factor-3-attenuates-chemokine-and-cytokine-expression-in-mouse-skeletal-muscle-after-exercise-and-facilitates-molecular-adaptation-to-endurance-training
#9
Rodrigo Fernández-Verdejo, Aline M Vanwynsberghe, Ahmed Essaghir, Jean-Baptiste Demoulin, Tsonwin Hai, Louise Deldicque, Marc Francaux
Activating transcription factor (ATF)3 regulates the expression of inflammation-related genes in several tissues under pathological contexts. In skeletal muscle, atf3 expression increases after exercise, but its target genes remain unknown. We aimed to identify those genes and to determine the influence of ATF3 on muscle adaptation to training. Skeletal muscles of ATF3-knockout (ATF3-KO) and control mice were analyzed at rest, after exercise, and after training. In resting muscles, there was no difference between genotypes in enzymatic activities or fiber type...
November 17, 2016: FASEB Journal: Official Publication of the Federation of American Societies for Experimental Biology
https://www.readbyqxmd.com/read/27837221/femoral-avulsion-fracture-of-acl-proximal-attachment-in-male-scuba-diver-case-report-and-review-of-the-literature
#10
Sebastian Zabierek, Krzysztof Nowak, Marcin Domzalski
Femoral ACL avulsion fractures were not well described in the literature, and there were only several reports describing mostly immature patients. A case of 50-year-old man with ACL femoral attachment avulsion fracture after pivoting knee injury during skiing was presented. The bony attachment was reduced and fixed arthroscopically with screws. Four months after surgery, patient was allowed to return to full sport activity with full range of motion. He was able to perform a one-leg-hop test without limitation, and the strength of quadriceps muscle was comparable to contralateral side...
November 11, 2016: Knee Surgery, Sports Traumatology, Arthroscopy: Official Journal of the ESSKA
https://www.readbyqxmd.com/read/27836905/electrophysiological-study-of-femoral-nerve-function-after-a-continuous-femoral-nerve-block-for-anterior-cruciate-ligament-reconstruction-a-randomized-controlled-single-blind-trial
#11
Kevin Stebler, Robin Martin, Kyle Robert Kirkham, Thierry Küntzer, Istvan Bathory, Eric Albrecht
BACKGROUND: A continuous femoral nerve block (CFNB) is an effective analgesic treatment after anterior cruciate ligament (ACL) reconstruction but may result in transient femoral nerve injuries and quadriceps muscle weakness, which in turn contribute to worsened functional outcomes. PURPOSE: To compare electrophysiological criteria of a femoral nerve injury as well as functional and pain-related outcomes after ACL reconstruction when analgesia was provided by a CFNB or intravenous patient-controlled analgesic of morphine (IV PCA)...
November 11, 2016: American Journal of Sports Medicine
https://www.readbyqxmd.com/read/27835043/risk-factors-for-medial-tibial-stress-syndrome-in-active-individuals-an-evidence-based-review
#12
Zachary K Winkelmann, Dustin Anderson, Kenneth E Games, Lindsey E Eberman
: Reference/Citation: Hamstra-Wright KL, Bliven KC, Bay C. Risk factors for medial tibial stress syndrome in physically active individuals such as runners and military personnel: a systematic review and meta-analysis. Br J Sports Med. 2015;49(6)362-369. CLINICAL QUESTION:  What factors put physically active individuals at risk to develop medial tibial stress syndrome (MTSS)? DATA SOURCES:  The authors performed a literature search of CINAHL, the Cochrane Central Register of Controlled Trials, EMBASE, and MEDLINE from each database's inception to July 2013...
November 1, 2016: Journal of Athletic Training
https://www.readbyqxmd.com/read/27834612/the-effectiveness-of-neuromuscular-electrical-stimulation-in-improving-voluntary-activation-of-the-quadriceps-a-critically-appraised-topic
#13
Cody B Bremner, William R Holcomb, Christopher D Brown, Melanie E Perreault
: Clinical Scenario: Orthopedic knee conditions are regularly treated in sports medicine clinics. Rehabilitation protocols for these conditions are often designed to address the associated quadriceps strength deficits. Despite these efforts, patients with orthopedic knee conditions often fail to completely regain their quadriceps strength. Disinhibitory modalities have recently been suggested as a clinical tool that can be used to counteract the negative effects of arthrogenic muscle inhibition (AMI), which is believed to limit the effectiveness of therapeutic exercise...
November 11, 2016: Journal of Sport Rehabilitation
https://www.readbyqxmd.com/read/27834556/the-relationships-between-muscle-power-and-physical-activity-in-older-men-with-chronic-obstructive-pulmonary-disease
#14
María Hernández, Fabrício Zambom-Ferraresi, Pilar Cebollero, Javier Hueto, José Antonio Cascante, María M Antón
The purpose of this study was to determine the potential relationship between muscle power of the lower extremities and the physical activity in older men with chronic obstructive pulmonary disease (COPD). Forty-four men (70.3 ± 6.7 years old) with moderate-to-severe COPD completed the six-minute walk test (6MWT), BODE (body mass index, obstruction, dyspnea, and exercise), a one-repetition maximum strength of the quadriceps femoris (1RMQF), and muscle power at 50% and 70% 1RMQF. Physical activity was measured using an accelerometer...
November 11, 2016: Journal of Aging and Physical Activity
https://www.readbyqxmd.com/read/27827979/an-age-related-morphometric-profile-of-skeletal-muscle-in-healthy-untrained-women
#15
Anastasia Bougea, George Papadimas, Constantinos Papadopoulos, George P Paraskevas, Nikolaos Kalfakis, Panagiota Manta, Evangelia Kararizou
There is a paucity of data on muscle biopsies in females of mixed ages in terms of age-related changes. Cross sections of autopsy material including the quadriceps femoris and biceps brachii muscles were obtained from 23 healthy women, aged 24-82 years, who had suffered sudden death. We calculated the percentage of the number, and the mean diameter, of type I and type II muscle fibers within the fascicles as well as in their peripheral parts. The number of type II fibers were shown to reduce significantly with age (p < 0...
November 7, 2016: Journal of Clinical Medicine
https://www.readbyqxmd.com/read/27826403/the-effect-of-increasing-volume-of-exercise-on-activation-pattern-of-vastus-medialis-and-lateralis-and-its-correlation-with-anterior-knee-pain-in-karate-elites
#16
Afsaneh Safar Cherati, Sara Lotfian, Aliashraf Jamshidi, Mohammad Ali Sanjari, Mohammad Razi
BACKGROUND: The effects of exercise volume on the pattern of muscle activity is one of the most important factors in training management and injury risk reduction. In the lower limb, the quadriceps muscle which plays a determining role in performing the stance and other karate techniques could be injured in intensive exercise and may induce anterior knee pain in athletes. OBJECTIVES: The aim of this study was to determine the relationship between training volume and muscle activity of vastus medialis and vastus lateralis and its association with anterior knee pain in karate elites...
September 2016: Asian Journal of Sports Medicine
https://www.readbyqxmd.com/read/27825072/surface-emg-analysis-for-the-quantification-of-thigh-muscle-dynamic-co-contractions-during-normal-gait
#17
Annachiara Strazza, Alessandro Mengarelli, Sandro Fioretti, Laura Burattini, Valentina Agostini, Marco Knaflitz, Francesco Di Nardo
The research purpose was to quantify the co-contraction patterns of quadriceps femoris (QF) vs. hamstring muscles during free walking, in terms of onset-offset muscular activation, excitation intensity, and occurrence frequency. Statistical gait analysis was performed on surface-EMG signals from vastus lateralis (VL), rectus femoris (RF), and medial hamstrings (MH), in 16315 strides walked by 30 healthy young adults. Results showed full superimpositions of MH with both VL and RF activity from terminal swing, 80 to 100% of gait cycle (GC), to the successive loading response (≈0-15% of GC), in around 90% of the considered strides...
January 2017: Gait & Posture
https://www.readbyqxmd.com/read/27824235/radial-shock-wave-therapy-effect-on-pain-and-motor-performance-in-a-paralympic-athlete-a-case-report
#18
Laura Mori, Lucio Marinelli, Elisa Pelosin, Matteo Gambaro, Roberto Trentini, Giovanni Abbruzzese, Carlo Trompetto
BACKGROUND: Recent studies demonstrated the usefulness of Radial Shock Waves Therapy (RSWT) in treating hypertonia in patients affected by cerebral palsy (CP), stroke, and dystonia. RSWT have never been used to treat spasticity in disabled athletes. CASE REPORT: An athlete affected by tetraparesis due to CP underwent three RSWT sessions in a week. We assessed muscular tone using the Modified Ashworth scale (MAS), pain and fatigue experienced during athletic performance with Visual Analogic Scale (VAS) and Borg scale Category-Ratio anchored at number 10 (Borg CR10)...
November 8, 2016: European Journal of Physical and Rehabilitation Medicine
https://www.readbyqxmd.com/read/27818472/a-single-session-of-neuromuscular-electrical-stimulation-enhances-vascular-endothelial-function-and-peripheral-blood-circulation-in-patients-with-acute-myocardial-infarction
#19
Shinya Tanaka, Takashi Masuda, Kentaro Kamiya, Nobuaki Hamazaki, Ayako Akiyama, Yumi Kamada, Emi Maekawa, Chiharu Noda, Minako Yamaoka-Tojo, Junya Ako
This study aimed to investigate whether a single session of neuromuscular electrical stimulation (NMES) can enhance vascular endothelial function and peripheral blood circulation in patients with acute myocardial infarction (AMI). Thirty-four male patients with AMI were alternately assigned to 2 groups, and received NMES with muscle contraction (NMES group, n = 17) or without muscle contraction (control group, n = 17) after admission. NMES was performed for quadriceps and gastrocnemius muscles of both legs for 30 minutes...
November 4, 2016: International Heart Journal
https://www.readbyqxmd.com/read/27815705/neural-biomechanical-and-physiological-factors-involved-in-sex-related-differences-in-the-maximal-rate-of-isometric-torque-development
#20
J Greig Inglis, Kyle McIntosh, David A Gabriel
OBJECTIVE: Recent research has reported that lower maximal rate of torque development (dτ/dt max) exhibited by females, relative to males, during knee extension can be accounted for by normalization to a maximal voluntary contraction (MVC); however, this was not seen in the upper limb. PURPOSE: The aim of the current work was to examine the contribution of maximum strength (τmax), twitch contraction time (CT), muscle fiber condition velocity (MFCV), and rate of muscle activation (Q30) to sex-differences in the dτ/dt max during maximal isometric dorsiflexion...
November 4, 2016: European Journal of Applied Physiology
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