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Quadriceps activation

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https://www.readbyqxmd.com/read/28916871/strength-and-functional-symmetry-is-associated-with-post-operative-rehabilitation-in-patients-following-anterior-cruciate-ligament-reconstruction
#1
Jay R Ebert, Peter Edwards, Luke Yi, Brendan Joss, Timothy Ackland, Richard Carey-Smith, Jens-Ulrich Buelow, Ben Hewitt
PURPOSE: To investigate strength and functional symmetry during common tests in patients after anterior cruciate ligament reconstruction (ACLR), and its association with post-operative rehabilitation. METHODS: At a median 11.0 months post-surgery (range 10-14), 111 ACLR patients were assessed. A rehabilitation grading tool was employed to evaluate the duration and supervision of rehabilitation, as well as whether structured jumping, landing and agility exercises were undertaken...
September 15, 2017: Knee Surgery, Sports Traumatology, Arthroscopy: Official Journal of the ESSKA
https://www.readbyqxmd.com/read/28916482/disposition-of-treosulfan-and-its-active-monoepoxide-in-a-bone-marrow-liver-lungs-brain-and-muscle-studies-in-a-rat-model-with-clinical-relevance
#2
Michał Romański, Anna Kasprzyk, Mateusz Walczak, Agnieszka Ziółkowska, Franciszek Główka
For the recent years, the application of treosulfan (TREO)-based conditioning prior to hematopoietic stem cell transplantation (HSCT) has been increasing as an alternative to busulfan-based therapy, especially for patients presenting high risk of developing hepato-, pulmo-, and neurotoxicity. So far, the penetration of TREO and its epoxy-derivatives into central nervous system and aqueous humor of the eye has been investigated. However, lacking knowledge on the compounds distribution into the other key tissues precludes comprehensive understanding and assessment of TREO clinical efficacy and toxicity...
September 12, 2017: European Journal of Pharmaceutical Sciences
https://www.readbyqxmd.com/read/28903010/effect-of-loading-on-in-vivo-tibiofemoral-and-patellofemoral-kinematics-of-healthy-and-acl-reconstructed-knees
#3
Jarred M Kaiser, Michael F Vignos, Richard Kijowski, Geoffrey Baer, Darryl G Thelen
BACKGROUND: Although knees that have undergone anterior cruciate ligament reconstruction (ACLR) often exhibit normal laxity on clinical examination, abnormal kinematic patterns have been observed when the joint is dynamically loaded during whole body activity. This study investigated whether abnormal knee kinematics arise with loading under isolated dynamic movements. HYPOTHESIS: Tibiofemoral and patellofemoral kinematics of ACLR knees will be similar to those of the contralateral uninjured control knee during passive flexion-extension, with bilateral differences emerging when an inertial load is applied...
September 1, 2017: American Journal of Sports Medicine
https://www.readbyqxmd.com/read/28899822/early-strength-recovery-after-anterior-cruciate-ligament-reconstruction-using-the-fascia-lata
#4
Gregory Haillotte, Alexandre Hardy, Benjamin Granger, Thibaut Noailles, Fréderic Khiami
INTRODUCTION: After undergoing anterior cruciate ligament (ACL) reconstruction, patients must recover at least 80% of their hamstring and quadriceps strength to be able to return to sports without risk to the graft. Harvesting of the patellar tendon leads to large deficits in quadriceps strength, while harvesting the hamstring tendons leads to large deficits in hamstring strength. However, there are no published studies on the strength deficit after ACL reconstruction with the fascia lata...
September 9, 2017: Orthopaedics & Traumatology, Surgery & Research: OTSR
https://www.readbyqxmd.com/read/28888715/acute-traumatic-rupture-of-the-patellar-tendon-in-pediatric-population-case-series-and-review-of-the-literature
#5
Mohamed Abdelhamid Ali Yousef, Scott Rosenfeld
BACKGROUND: Intact knee extensor mechanism is required for the normal function of the lower extremity. Patellar tendon rupture is a relatively rare injury with peak age incidence around 40 years and usually occurs midsubstance. The occurrence of pure patellar tendon rupture without bony avulsion is an extremely rare injury in the pediatric population with few cases reported in the literature with limited information regarding frequency, complications, and outcomes in children. However, due to increased participation in sports and high-energy recreational activities during childhood, the frequency of such injuries has progressively increased...
September 1, 2017: Injury
https://www.readbyqxmd.com/read/28883721/determinants-of-each-domain-of-the-short-physical-performance-battery-in-copd
#6
Roberto Bernabeu-Mora, Luz M Giménez-Giménez, Joaquina Montilla-Herrador, Gloria García-Guillamón, José Antonio García-Vidal, Francesc Medina-Mirapeix
BACKGROUND: The Short Physical Performance Battery (SPPB) is an assessment tool with good prognostic value in COPD. It includes the following: standing balance, 4 m gait speed test (4MGS), and the timed five-repetition sit-to-stand test (5STS). The specific differences in determinants between these three tasks have not been adequately characterized in COPD patients. We aimed to identify health-related, functional, and psychological determinants of each SPPB test. METHODS: We conducted a cross-sectional analysis of 137 patients with stable COPD...
2017: International Journal of Chronic Obstructive Pulmonary Disease
https://www.readbyqxmd.com/read/28878456/daily-physical-activity-affects-exercise-capacity-in-patients-with-idiopathic-pulmonary-fibrosis
#7
Akira Morino, Hiroki Takahashi, Hirofumi Chiba, Sumio Ishiai
[Purpose] The aim of this study was to determine which factors, including pulmonary, physical, and mental functions; dyspnea; and daily physical activity (PA) affect the 6-minute walk distance (6MWD) in IPF patients. [Subjects and Methods] The pulmonary, physical, and mental functions; dyspnea; PA; and 6MWD were assessed in 38 outpatients with IPF. PA was represented by the mean number of steps per day. [Results] The mean 6MWD was 443.8 m (SD, 98.5), and the mean number of steps per day showing PA was 5148...
August 2017: Journal of Physical Therapy Science
https://www.readbyqxmd.com/read/28875045/the-training-effect-of-early-intervention-with-a-hybrid-assistive-limb-after-total-knee-arthroplasty
#8
Takashi Fukaya, Hirotaka Mutsuzaki, Kenichi Yoshikawa, Ayumu Sano, Masafumi Mizukami, Masashi Yamazaki
After total knee arthroplasty (TKA), it is important for patients to show early improvements in knee joint function and walking to regain independence in performing the activities of daily life. We conducted for 4 weeks an intervention one week after TKA using a hybrid assistive limb (HAL: unilateral leg type) as an exoskeleton robotic device to facilitate knee joint function and walking. The intervention improved the range of knee extension movement safely and without pain compared to preoperation. In addition, we found that training with the HAL improved walking ability, speed, and rate, as well as the time taken to perform the timed up and go (TUG) test compared to preoperation...
2017: Case Reports in Orthopedics
https://www.readbyqxmd.com/read/28873321/separate-and-combined-effects-of-time-of-day-and-verbal-instruction-on-knee-extensor-neuromuscular-adjustments
#9
Hamdi Jaafar, Olivier Girard, Hanene Lajili
We examined time of day and verbal instruction separate and combined effects on knee extensor neuromuscular adjustments, with special reference to rapid muscle force production capacity. Ten healthy male participants performed four experimental trials in counterbalanced order: morning-"hard-and-fast" instruction, evening-"hard-and-fast" instruction, morning-"fast" instruction and evening-"fast" instruction. During each experimental trial, neuromuscular performance was assessed from the completion of six maximal isometric voluntary contractions (rest = 2 minutes) of the knee extensors with concomitant quadriceps surface EMG recordings...
September 5, 2017: Applied Physiology, Nutrition, and Metabolism, Physiologie Appliquée, Nutrition et Métabolisme
https://www.readbyqxmd.com/read/28872396/whole-body-vibration-on-performance-of-quadriceps-after-acl-reconstruction-a-blinded-randomized-controlled-trial
#10
Karinna Sonálya Aires da Costa, Daniel Tezoni Borges, Liane de Brito Macedo, Caio Alano de Almeida Lins, Jamilson Simões Brasileiro
CONTEXT: Whole body vibration (WBV) has been widely used in clinical and sport practice. These devices produce constant vibrations originating symmetrical waves that move along the vertical axis. It is suggested that mechanical stimuli produced by high vibration can be an alternative to improve neuromuscular performance and balance in different populations. However, there is still a lack of consensus in the literature regarding neurophysiological responses in the skeletal muscle immediately after the use of WBV, specifically in individuals subjected to ACL reconstruction...
September 5, 2017: Journal of Sport Rehabilitation
https://www.readbyqxmd.com/read/28869430/increased-intrinsic-stiffness-and-mineralization-in-femurs-of-adult-rats-after-high-intensity-treadmill-running-training
#11
Clarisa Bozzini, Ginés Viscor, Juan C Ríos Kristjánsson, Emilio Picasso, Graciela Champin, Rosa M Alippi, Carlos E Bozzini
BACKGROUND: Physical activity plays a tremendous role in determining bone mechanical behavior, which is superimposed to gravidity. OBJECTIVE: Compare the geometric and material responses of the rat femur to a high intensity treadmill running training of a relatively short duration, as assessed by 3-point mechanical test. METHODS: Mature male rats (180.0 ± 30 g) were assigned (7 rats/group) to no exercise (NE) or treadmill exercise (EX)...
2017: Bio-medical Materials and Engineering
https://www.readbyqxmd.com/read/28869185/gait-variability-and-motor-control-in-patients-with-knee-osteoarthritis-as-measured-by-the-uncontrolled-manifold-technique
#12
Gwenllian Fflur Tawy, Philip Rowe, Leela Biant
Knee osteoarthritis (OA) causes pain, reduced muscular strength and stiffness of the affected joint. In response, the motor control mechanism is altered, potentially compromising stability during acts of daily living. Reduced walking stability can be quantified in terms of gait variability. This study therefore aimed to identify and quantify the effects of knee arthritis on gait variability. Fifty adults (25 males/25 females) with end-stage OA of the knee sufficiently symptomatic to require joint replacement, walked on a self-paced treadmill for 2min...
August 18, 2017: Gait & Posture
https://www.readbyqxmd.com/read/28869119/does-home-based-pulmonary-rehabilitation-improve-functional-capacity-peripheral-muscle-strength-and-quality-of-life-in-patients-with-bronchiectasis-compared-to-standard-care
#13
Anderson José, Anne E Holland, Cristiane S de Oliveira, Jessyca P R Selman, Rejane A S de Castro, Rodrigo A Athanazio, Samia Z Rached, Alberto Cukier, Rafael Stelmach, Simone Dal Corso
BACKGROUND: Home-based pulmonary rehabilitation is a promising intervention that may help patients to overcome the barriers to undergoing pulmonary rehabilitation. However, home-based pulmonary rehabilitation has not yet been investigated in patients with bronchiectasis. OBJECTIVES: To investigate the effects of home-based pulmonary rehabilitation in patients with bronchiectasis. METHODS: An open-label, randomized controlled trial with 48 adult patients with bronchiectasis will be conducted...
August 19, 2017: Brazilian Journal of Physical Therapy
https://www.readbyqxmd.com/read/28869034/plasticity-and-function-of-human-skeletal-muscle-in-relation-to-disuse-and-rehabilitation-influence-of-ageing-and-surgery
#14
Charlotte Suetta
In order to study the influence of disuse and aging on skeletal muscle homeostasis, different human models were employed. Effects of chronic disuse were investigated in elderly patients suffering from uni-lateral hip-osteoarthritis, whereas the effect of short-term disuse (4 and 14 days of unilateral lower limb immobilisation) was assessed in healthy young and old individuals. In summary, chronic muscle disuse in the elderly was associated with marked quantitative as well as qualitative neuromuscular impairments...
August 2017: Danish Medical Journal
https://www.readbyqxmd.com/read/28864244/performance-on-a-clinical-quadriceps-activation-battery-is-related-to-a-laboratory-measure-of-activation-and-recovery-after-total-knee-arthroplasty
#15
Michael Bade, Tamara Struessel, Roger Paxton, Joshua Winters, Carol Baym, Jennifer Stevens-Lapsley
OBJECTIVE: To determine the relationship between performance on a clinical quadriceps activation battery (QAB) with 1) activation measured by doublet interpolation and 2) recovery of quadriceps strength and functional performance following total knee arthroplasty (TKA). DESIGN: This was a planned secondary analysis of a randomized controlled trial SETTING: University research laboratory PARTICIPANTS: One hundred sixty-two patients (aged 63 ± 7 (mean ± sd) years; 89 females) undergoing TKA participated...
August 29, 2017: Archives of Physical Medicine and Rehabilitation
https://www.readbyqxmd.com/read/28860877/maintenance-of-the-paraspinal-muscles-may-protect-against-radiographic-knee-osteoarthritis
#16
Koichiro Azuma, Yasushi Sera, Takuma Shinjo, Michiyo Takayama, Eisuke Shiomi, Suketaka Momoshima, Yasushi Iwao, Hiroyuki Ishida, Hideo Matsumoto
BACKGROUND: Knee osteoarthritis (OA) is an increasing health problem worldwide. So far, only obesity and quadriceps weakness are identified as modifiable risk factors for knee OA. Core muscle strengthening is becoming increasingly popular among older adults because of its ability to enhance the activities of daily living during old age. This study investigated the associations of the size and quality of the abdominal trunk muscles with radiographic knee osteoarthritis (RKOA). METHODS: From 2012 to 2016, data were collected from 146 males and 135 females (age 63...
2017: Open Access Rheumatology: Research and Reviews
https://www.readbyqxmd.com/read/28852828/exercise-related-sensations-contribute-to-decrease-power-during-repeated-cycle-sprints-with-limited-influence-on-neural-drive
#17
Olivier Girard, François Billaut, Ryan J Christian, Paul S Bradley, David J Bishop
PURPOSES: We manipulated the inspired oxygen fraction (FiO2) to examine the effects of physiological perturbations on exercise-related sensations and the neural drive of the quadriceps during repeated, brief, maximal cycle sprints. METHODS: Nine active males completed a repeated sprint cycle protocol (10 × 4-s maximal sprints with 30 s of passive recovery) in normoxia (NM; FiO2 0.21) and severe normobaric hypoxia (HY; FiO2 0.13). Peak power, quadriceps Root Mean Squared electromyography (RMS EMG), physiological (heart rate, arterial oxygen saturation, blood lactate concentration) and perceptual responses were recorded...
August 29, 2017: European Journal of Applied Physiology
https://www.readbyqxmd.com/read/28846654/can-magnesium-enhance-exercise-performance
#18
REVIEW
Yijia Zhang, Pengcheng Xun, Ru Wang, Lijuan Mao, Ka He
Magnesium (Mg) is an essential mineral that plays a critical role in the human body. It takes part in the process of energy metabolism and assists the maintenance of normal muscle function. A number of studies evaluated the association between Mg status/supplementation and exercise performance and found that the need for Mg increased as individuals' physical activity level went up. Animal studies indicated that Mg might improve exercise performance via enhancing glucose availability in the brain, muscle and blood; and reducing/delaying lactate accumulation in the muscle...
August 28, 2017: Nutrients
https://www.readbyqxmd.com/read/28840325/tunnel-widening-after-single-versus-double-bundle-anterior-cruciate-ligament-reconstruction-a-randomized-8-year-follow-up-study
#19
S Beyaz, Ü Ö Güler, Ş Demir, S Yüksel, B M Çınar, G Özkoç, S Akpınar
OBJECTIVE: The purpose of this study was to compare the single-bundle (SB) and double-bundle (DB) surgical techniques for anterior cruciate ligament (ACL) reconstruction with regard to tunnel widening, isokinetic muscle strength, and clinical outcomes over an 8-year follow-up period. METHODS: This study included 31 patients with ACL injury who underwent ACL reconstruction via the SB (n = 16) or the DB (n = 15) technique. Isokinetic and concentric strength measurements of the quadriceps and hamstring muscles were conducted at postoperative 6 months and postoperative 8 years, and 3D-CT scans of the knee joints were performed on the 2nd, 3rd and 6th month, and the 8th year postoperatively...
August 24, 2017: Archives of Orthopaedic and Trauma Surgery
https://www.readbyqxmd.com/read/28836455/antagonist-muscle-co-contraction-during-a-double-leg-landing-maneuver-at-two-heights
#20
Hossein Mokhtarzadeh, Chen Hua Yeow, James Cho Hong Goh, Denny Oetomo, Katie Ewing, Peter Vee Sin Lee
BACKGROUND: Knee injuries are common during landing activities. Greater landing height increases peak ground reaction forces (GRFs) and loading at the knee joint. As major muscles to stabilize the knee joint, Quadriceps and Hamstring muscles provide internal forces to attenuate the excessive GRF. Despite the number of investigations on the importance of muscle function during landing, the role of landing height on these muscles forces using modeling during landing is not fully investigated...
August 24, 2017: Computer Methods in Biomechanics and Biomedical Engineering
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