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Quadriceps activation

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https://www.readbyqxmd.com/read/28739425/associations-of-isokinetic-and-isotonic-knee-strength-with-knee-function-and-activity-level-after-anterior-cruciate-ligament-reconstruction-a-prospective-cohort-study
#1
Yong-Hao Pua, Jia-Ying Ho, Suelyn Ai-Sim Chan, Shin-Jiun Khoo, Hwei-Chi Chong
BACKGROUND: Although isokinetic dynamometry often serves as a reference to assess the concurrent validity of weight-machine isotonic strength testing, it is unknown whether isokinetic knee strength is associated with knee function and activity level more strongly than isotonic knee strength in patients with an anterior cruciate ligament reconstruction (ACLR). This study aimed to compare the associations of isokinetic and isotonic knee strength with knee function and work-and-sports activity levels in patients with ACLR...
July 21, 2017: Knee
https://www.readbyqxmd.com/read/28736080/the-effect-of-ankle-foot-orthosis-alignment-on-walking-in-individuals-treated-for-traumatic-lower-extremity-injuries
#2
Starr E Brown, Elizabeth Russell Esposito, Jason M Wilken
Limb salvage surgeries are performed to treat a variety of lower limb pathologies and traumatic injuries. Individuals who have undergone limb salvage surgeries may require an ankle foot orthosis (AFO) to compensate for limb impairments and restore walking ability. Understanding the effects of AFO design parameters on gait biomechanics is important to refine AFO prescription criteria. In this study sagittal plane kinematic and kinetic data, muscle activity and alignment preference were examined as individuals treated for traumatic lower extremity injuries (N=12) walked over level ground with Plantarflexed (PF), Neutral, and Dorsiflexed (DF) aligned AFOs...
July 5, 2017: Journal of Biomechanics
https://www.readbyqxmd.com/read/28735780/electromyographic-activity-of-the-vastus-intermedius-muscle-in-patients-with-stiff-knee-gait-after-stroke-a-retrospective-observational-study
#3
Davide Mazzoli, Erika Giannotti, Mario Manca, Maria Longhi, Paolo Prati, Michela Cosma, Giovanni Ferraresi, Monica Morelli, Paolo Zerbinati, Stefano Masiero, Andrea Merlo
Stiff-knee gait (SKG) in hemiplegic patients is often due to an inappropriate activity of the quadriceps femoris. However, there are no studies in literature addressing the vastus intermedius (VI) involvement in SKG. In this study, VI activity was analyzed in a sample of 46 chronic stroke patients with SKG, during spontaneous gait. VI activity was recorded by fine-wire electrodes inserted under ultrasound guidance then confirmed by electrical stimulation. The measured VI activity was compared to the normal reference pattern reported in literature and classified (e...
July 5, 2017: Gait & Posture
https://www.readbyqxmd.com/read/28735354/transplantation-sites-for-human-and-murine-islets
#4
Rebecca A Stokes, Kim Cheng, Amit Lalwani, Michael M Swarbrick, Helen E Thomas, Thomas Loudovaris, Tom W Kay, Wayne J Hawthorne, Philip J O'Connell, Jenny E Gunton
AIMS/HYPOTHESIS: Beta cell replacement is a potential cure for type 1 diabetes. In humans, islet transplants are currently infused into the liver via the portal vein, although this site has disadvantages. Here, we investigated alternative transplantation sites for human and murine islets in recipient mice, comparing the portal vein with quadriceps muscle and kidney, liver and spleen capsules. METHODS: Murine islets were isolated from C57BL6/J mice and transplanted into syngeneic recipients...
July 22, 2017: Diabetologia
https://www.readbyqxmd.com/read/28723717/localized-muscle-vibration-reverses-quadriceps-muscle-hypotrophy-and-improves-physical-function-a-clinical-and-electrophysiological-study
#5
Maria Grazia Benedetti, Gennaro Boccia, Lorenzo Cavazzuti, Elena Magnani, Elisabetta Mariani, Alberto Rainoldi, Roberto Casale
Quadriceps weakness has been associated with knee osteoarthritis (OA). High-frequency localized muscle vibration (LMV) has been proposed recently for quadriceps strengthening in patients with knee OA. The purpose of this study was (a) to investigate the clinical effectiveness of high-frequency LMV on quadriceps muscle in patients with knee OA and (b) to disentangle, by means of surface electromyography (sEMG), the underlying mechanism. Thirty patients, aged between 40 and 65 years, and clinically diagnosed with knee OA were included in this randomized, controlled, single-blinded pilot study...
July 18, 2017: International Journal of Rehabilitation Research. Revue Internationale de Recherches de Réadaptation
https://www.readbyqxmd.com/read/28720481/knee-extension-and-flexion-strength-asymmetry-in-human-immunodeficiency-virus-positive-subjects-a-cross-sectional-study
#6
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/28716692/the-fatigue-of-a-full-body-resistance-exercise-session-in-trained-men
#7
Paul W M Marshall, Rebecca Cross, Michael Haynes
OBJECTIVES: We examined the fatigue and recovery for 48h following a full-body resistance exercise session in trained men. DESIGN: Experimental cross-sectional study. METHODS: Eight resistance trained men volunteered to participate (mean±SD; age 27.0±6.0 years, height 1.79±0.05m, weight 81.8±6.8kg, training experience 7.8±5.0 years). Fatigue and pain was measured before, after, 1h post, 24h and 48h post the full-body resistance exercise session, which was based on in-season models used in contact team sports (e...
July 4, 2017: Journal of Science and Medicine in Sport
https://www.readbyqxmd.com/read/28714825/quadriceps-and-patient-reported-function-in-acl-reconstructed-patients-a-principal-component-analysis
#8
Grant E Norte, Jay N Hertel, Susan A Saliba, David R Diduch, Joseph M Hart
CONTEXT: Assessment of physical function for individuals after ACL reconstruction (ACL-R) is complex and warrants the use of diverse evaluation strategies. To maximize the efficiency of assessment, there is a need to identify tests that provide the most meaningful information about this population. OBJECTIVE: To investigate underlying constructs of quadriceps muscle function that uniquely describe aspects of performance in patients after ACL-R, and establish clinical thresholds for measures able to classify patients with and without ACL-R...
July 17, 2017: Journal of Sport Rehabilitation
https://www.readbyqxmd.com/read/28712376/grape-pomace-improves-performance-antioxidant-status-fecal-microbiota-and-meat-quality-of-piglets
#9
I Kafantaris, D Stagos, B Kotsampasi, A Hatzis, A Kypriotakis, K Gerasopoulos, S Makri, N Goutzourelas, C Mitsagga, I Giavasis, K Petrotos, S Kokkas, P Goulas, V Christodoulou, D Kouretas
In the present study, grape pomace (GP) was used as feed additive in the diet of weaned piglets in order to develop innovative feedstuffs and to investigate their potential beneficial effects on welfare, productivity and meat quality. For examining the antioxidant capacity of the experimental feeds, 24 piglets of 20 days old were assigned to two experimental groups receiving standard or experimental diet for 30 days. Blood and tissues collections were performed at four different time-points, 2, 20, 35 and 50 days post birth...
July 17, 2017: Animal: An International Journal of Animal Bioscience
https://www.readbyqxmd.com/read/28707752/analysis-of-the-correlation-between-knee-extension-torque-and-patellar-tendon-elastic-property
#10
P Mannarino, K M M Lima, C R C Fontenelle, T T Matta, B F de Salles, R Simão, L F Oliveira
PURPOSE: Quadriceps strength and patellar tendon (PT) are directly linked and intimately related to daily activities and lower limb function. However, the correlation between knee extension torque (KT) and PT Young's modulus (E) measured directly is still unknown. METHOD: We used supersonic shearwave imaging (SSI) to evaluate the elastic property of PT in healthy young men and analysed its correlation with KT. Twenty-two healthy young males were included and both knees were examined...
July 14, 2017: Clinical Physiology and Functional Imaging
https://www.readbyqxmd.com/read/28704311/acute-neuromuscular-and-endocrine-responses-to-two-different-compound-exercises-squat-versus-deadlift
#11
Matthew J Barnes, Adam Miller, Daniel Reeve, Robin Jc Stewart
Anecdotally, it is believed that the deadlift exercise brings about greater levels of central fatigue than other exercises; however no empirical evidence exists to support this view. Additionally, little is known about the acute endocrine response to heavy deadlift exercise and how this may differ to other similar compound exercises. Therefore, the aim of this study was to identify and compare the acute, neuromuscular and endocrine responses to squat and deadlift exercise. Ten resistance trained males completed 8 sets of 2 repetitions at 95 % of one repetition maximum...
July 12, 2017: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/28704193/rehabilitation-of-patients-with-hip-joint-arthroplasty-late-post-surgery-period-hospital-rehabilitation
#12
Maya S Krastanova, Elena M Ilieva, Danelina E Vacheva
BACKGROUND: Hip joint replacement (endoprosthesis, alloplasty) has become one of the most frequent surgery interventions of the 20th century. AIM: To conduct rehabilitation therapy in the late post-surgery period of hospital rehabilitation (45 days after surgery), to track patients' progress and measure the results. MATERIALS AND METHODS: One hundred and fifty-two patients with hip joint endoprosthesis were included in the study. All underwent surgery and rehabilitation at the Department of Clinical Rehabilitation of the Physical and Rehabilitation Medicine Clinic at Doctor G...
June 1, 2017: Folia Medica
https://www.readbyqxmd.com/read/28701540/a-novel-paraplegia-model-in-awake-behaving-macaques
#13
Max Ostrinsky Krucoff, Katie Zhuang, David B Macleod, Allen Yin, Yoon Woo Byun, Roberto Jose Manson, Dennis A Turner, Laura Oliveira, Mikhail A Lebedev
Lower limb paralysis from spinal cord injury (SCI) or neurological disease carries a poor prognosis for recovery and remains a large societal burden. Neurophysiological and neuroprosthetic research have the potential to improve quality of life for these patients; however, the lack of an ethical and sustainable non-human primate model for paraplegia hinders their advancement. Therefore, our multi-disciplinary team developed a way to induce temporary paralysis in awake behaving macaques by creating a fully implantable lumbar epidural catheter-subcutaneous port system that enables easy and reliable targeted drug delivery for sensorimotor blockade...
July 12, 2017: Journal of Neurophysiology
https://www.readbyqxmd.com/read/28687982/adductor-canal-block-in-combination-with-posterior-capsular-infiltration-on-the-pain-control-after-tka
#14
M Zhou, H Ding, J Ke
BACKGROUND: Adductor canal block (ACB) and local infiltration anesthesia (LIA) are both widely accepted techniques for postoperative pain control without quadriceps weakness after total knee arthroplasty (TKA). However, the above techniques are insufficient in efficacy or duration. AIMS: The aim of our study was to address whether ACB plus posterior capsular infiltration (PCI) result in improved analgesia compared with ACB or LIA in patients underwent TKA during 48 h after operation...
July 7, 2017: Irish Journal of Medical Science
https://www.readbyqxmd.com/read/28684597/dynamic-hyperinflation-and-exercise-limitations-in-obese-asthmatic-women
#15
Palmira Gabriele Ferreira, Patricia Duarte Freitas, Aline Grandi Silva, Desiderio Cano Porras, Rafael Stelmach, Alberto Cukier, Frederico Leon Arrabal Fernandes, Mílton A Martins, Celso R F Carvalho
Obese individuals and patients with asthma can develop dynamic hyperinflation (DH) during exercise; however, no previous study has investigated DH as a factor associated with reduced exercise capacity in obese asthmatic women. The aim of the present study was to examine the occurrence of DH and exercise limitations in obese asthmatics. Obese grade II (obese group (Ob-G); BMI 35-39.9 kg/m2; n=36) and non-obese (non-obese group (NOb-G); BMI 18.5-29.9 kg/m2; n=18) asthmatic patients performed a cardiopulmonary test to quantify peak VO2 and a submaximal exercise test to assess DH...
July 6, 2017: Journal of Applied Physiology
https://www.readbyqxmd.com/read/28674922/effects-of-training-programs-based-on-ipsilateral-voluntary-and-stimulated-contractions-on-muscle-strength-and-monopedal-postural-control-of-the-contralateral-limb
#16
Mohamed Abdelhafid Kadri, Frederic Noé, Merbouha Boulahbel Nouar, Thierry Paillard
PURPOSE: To compare the effects of unilateral strength training by stimulated and voluntary contractions on muscle strength and monopedal postural control of the contralateral limb. METHODS: 36 non-active healthy male subjects were recruited and split randomly into three groups. Two groups of 12 subjects took part in a strength-training program (3 sessions a week over 8 weeks) comprising 43 contractions of the quadriceps femoris of the ipsilateral limb (at 20% of the MVC)...
July 3, 2017: European Journal of Applied Physiology
https://www.readbyqxmd.com/read/28665989/addition-of-transcranial-direct-current-stimulation-to-quadriceps-strengthening-exercise-in-knee-osteoarthritis-a-pilot-randomised-controlled-trial
#17
Wei-Ju Chang, Kim L Bennell, Paul W Hodges, Rana S Hinman, Carolyn L Young, Valentina Buscemi, Matthew B Liston, Siobhan M Schabrun
A randomised, assessor- and participant-blind, sham-controlled trial was conducted to assess the safety and feasibility of adding transcranial direct current stimulation (tDCS) to quadriceps strengthening exercise in knee osteoarthritis (OA), and provide data to inform a fully powered trial. Participants were randomised to receive active tDCS+exercise (AT+EX) or sham tDCS+exercise (ST+EX) twice weekly for 8 weeks whilst completing home exercises twice per week. Feasibility, safety, patient-perceived response, pain, function, pressure pain thresholds (PPTs) and conditioned pain modulation (CPM) were assessed before and after treatment...
2017: PloS One
https://www.readbyqxmd.com/read/28663381/a-study-of-clinical-and-physiological-relations-of-daily-physical-activity-in-precapillary-pulmonary-hypertension
#18
Marios Panagiotou, Martin Kevin Johnson, Zafeiris Louvaris, Julien Steven Baker, Alistair Colin Church, Andrew J Peacock, Ioannis Vogiatzis
Daily physical activity is reduced in precapillary pulmonary hypertension (PH) but the underlying mechanisms are inadequately explored. We sought to investigate clinical and physiological relations of daily physical activity and profile differences between less and more active patients with precapillary PH. A prospective, cross-sectional study of 20 patients with precapillary PH who undertook a) a comprehensive clinical assessment, b) a preliminary treadmill test, c) 7-day monitoring of daily walking intensity with triaxial accelerometry and d) a personalized treadmill test corresponding to the individual patient mean daily walking intensity with real-time physiological measurements...
June 29, 2017: Journal of Applied Physiology
https://www.readbyqxmd.com/read/28658860/muscle-activation-profiles-and-co-activation-of-quadriceps-and-hamstring-muscles-around-knee-joint-in-indian-primary-osteoarthritis-knee-patients
#19
Sanjeev Kumar Sharma, Shiv Lal Yadav, U Singh, Sanjay Wadhwa
INTRODUCTION: Osteoarthritis (OA) of knee is a common joint disease. It is associated with reduced knee joint stability due to impaired quadriceps strength, pain, and an altered joint structure. There is altered muscle activation in knee OA patients, which interferes with normal load distribution around the knee and facilitates disease progression. AIM: Our primary aim was to determine activation patterns of the muscles i.e., quadriceps and hamstrings in knee OA patients during walking...
May 2017: Journal of Clinical and Diagnostic Research: JCDR
https://www.readbyqxmd.com/read/28658071/a-review-of-field-based-assessments-of-neuromuscular-control-and-their-utility-in-male-youth-soccer-players
#20
Paul J Read, Jon L Oliver, Mark B A De Ste Croix, Gregory D Myer, Rhodri S Lloyd
Lower extremity injuries in male youth soccer are common and equate to a substantial time-loss from training and competitions during the course of a season. Extended periods of absence will impact player involvement in skill and physical development activities, as well as participation in competitive match play. Neuromuscular risk factors for lower extremity injury in male youth soccer players can be categorized into quadriceps dominance; leg dominance; ligament dominance; trunk dominance and reduced dynamic stability...
June 22, 2017: Journal of Strength and Conditioning Research
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