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Quadriceps activation

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https://www.readbyqxmd.com/read/28642711/weekly-time-course-of-neuro-muscular-adaptation-to-intensive-strength-training
#1
Niklas Brown, Dieter Bubeck, Daniel F B Haeufle, Johannes Weickenmeier, Ellen Kuhl, Wilfried Alt, Syn Schmitt
Detailed description of the time course of muscular adaptation is rarely found in literature. Thus, models of muscular adaptation are difficult to validate since no detailed data of adaptation are available. In this article, as an initial step toward a detailed description and analysis of muscular adaptation, we provide a case report of 8 weeks of intense strength training with two active, male participants. Muscular adaptations were analyzed on a morphological level with MRI scans of the right quadriceps muscle and the calculation of muscle volume, on a voluntary strength level by isometric voluntary contractions with doublet stimulation (interpolated twitch technique) and on a non-voluntary level by resting twitch torques...
2017: Frontiers in Physiology
https://www.readbyqxmd.com/read/28635194/volitional-rehabilitative-assessments-in-patients-admitted-in-a-post-intensive-care-step-down-unit-a-feasibility-study
#2
Mara Paneroni, Francesco D' Abrosca, Georges Fokom, Laura Comini, Michele Vitacca
A high variability in functional tests and activities used during the pulmonary rehabilitation has been observed in post-intensive care unit (ICU) patients, and the best battery of tests to adopt has not been described yet. We tested in patients admitted in a post-ICU Step Down Unit the ability to perform the more frequent functional volitional tests. The relations of each single volitional test with general disability and dyspnea at discharge were also evaluated. Ten volitional tests including: bedside spirometry test (ST: FEV1%, FVC%), maximal inspiratory pressure (MIP), maximal expiratory pressure (MEP), Peak Expiratory Flow during Cough (PCEF), Quadriceps Muscle Strength (QMS), latissimus Dorsi and teres Major Strength (DMS), Brachial biceps Muscle Strength (BMS), effort tolerance measured by sit-to-stand test, Takahashi test and 6-Min Walking Test (6MWT), were evaluated in post-ICU patients at entry and discharge from in-hospital rehabilitation...
May 18, 2017: Monaldi Archives for Chest Disease, Archivio Monaldi Per le Malattie del Torace
https://www.readbyqxmd.com/read/28630577/effects-of-high-velocity-elastic-band-versus-heavy-resistance-training-on-hamstring-strength-activation-and-sprint-running-performance
#3
Donatas Janusevicius, Audrius Snieckus, Albertas Skurvydas, Viktoras Silinskas, Eugenijus Trinkunas, Joan Aureli Cadefau, Sigitas Kamandulis
Hamstring muscle injuries occur during high-speed activities, which suggests that muscular strength at high velocities may be more important than maximal strength. This study examined hamstring adaptations to training for maximal strength and for strength at high velocities. Physically active men (n = 25; age, 23.0 ± 3.2 years) were randomly divided into: (1) a resistance training (RT, n = 8) group, which performed high-load, low-velocity concentric-eccentric hamstring contractions; (2) a resistance training concentric (RTC; n = 9) group, which performed high-load, low-velocity concentric-only hamstring contractions; and (3) a high-velocity elastic band training (HVT, n = 8) group, which performed low-load, high-velocity concentric-eccentric hamstring contractions...
June 2017: Journal of Sports Science & Medicine
https://www.readbyqxmd.com/read/28628370/multiple-joint-exercises-using-elastic-resistance-bands-vs-conventional-resistance-training-equipment-a-cross-over-study
#4
Vegard M Iversen, Paul Jarle Mork, Ottar Vasseljen, Ronny Bergquist, Marius S Fimland
Previous studies indicate that elastic resistance bands (ERB) can be a viable option to conventional resistance-training equipment (CRE) during single-joint resistance exercises, but their efficacy has not been established for several commonly used multiple-joint resistance exercises. Thus, we compared muscular activation levels in four popular multiple-joint exercises performed with ERB (TheraBand(®)) vs. CRE (Olympic barbell or cable pulley machines). In a cross-over design, men and women (n = 29) performed squats, stiff-legged deadlifts, unilateral rows and lateral pulldown using both modalities...
June 19, 2017: European Journal of Sport Science
https://www.readbyqxmd.com/read/28611677/greater-neural-adaptations-following-high-vs-low-load-resistance-training
#5
Nathaniel D M Jenkins, Amelia A Miramonti, Ethan C Hill, Cory M Smith, Kristen C Cochrane-Snyman, Terry J Housh, Joel T Cramer
We examined the neuromuscular adaptations following 3 and 6 weeks of 80 vs. 30% one repetition maximum (1RM) resistance training to failure in the leg extensors. Twenty-six men (age = 23.1 ± 4.7 years) were randomly assigned to a high- (80% 1RM; n = 13) or low-load (30% 1RM; n = 13) resistance training group and completed leg extension resistance training to failure 3 times per week for 6 weeks. Testing was completed at baseline, 3, and 6 weeks of training. During each testing session, ultrasound muscle thickness and echo intensity, 1RM strength, maximal voluntary isometric contraction (MVIC) strength, and contractile properties of the quadriceps femoris were measured...
2017: Frontiers in Physiology
https://www.readbyqxmd.com/read/28608438/a-randomized-clinical-trial-investigating-the-efficacy-of-targeted-nutrition-as-adjunct-to-exercise-training-in-copd
#6
Coby van de Bool, Erica P A Rutten, Ardy van Helvoort, Frits M E Franssen, Emiel F M Wouters, Annemie M W J Schols
BACKGROUND: Evidence regarding the efficacy of nutritional supplementation to enhance exercise training responses in COPD patients with low muscle mass is limited. The objective was to study if nutritional supplementation targeting muscle derangements enhances outcome of exercise training in COPD patients with low muscle mass. METHODS: Eighty-one COPD patients with low muscle mass, admitted to out-patient pulmonary rehabilitation, randomly received oral nutritional supplementation, enriched with leucine, vitamin D, and omega-3 fatty acids (NUTRITION) or PLACEBO as adjunct to 4 months supervised high intensity exercise training...
June 12, 2017: Journal of Cachexia, Sarcopenia and Muscle
https://www.readbyqxmd.com/read/28601942/anatomic-reconstruction-of-the-medial-patellofemoral-ligament-in-children-and-adolescents-using-a-pedicled-quadriceps-tendon-graft-shows-favourable-results-at-a-minimum-of-2-year-follow-up
#7
Manfred Nelitz, Jens Dreyhaupt, Sean Robert March Williams
PURPOSE: In adults, reconstruction of the medial patellofemoral ligament (MPFL) has shown good results. Treatment for recurrent patellar instability in children and adolescents with open growth plates, however, requires alternative MPFL reconstruction techniques. This study presents the outcomes of a minimally invasive technique for anatomic reconstruction of the MPFL in children using a pedicled superficial quadriceps tendon graft, hardware-free patellar graft attachment, and anatomic femoral fixation that spares the distal femoral physis...
June 10, 2017: Knee Surgery, Sports Traumatology, Arthroscopy: Official Journal of the ESSKA
https://www.readbyqxmd.com/read/28595235/a-warm-up-routine-that-incorporates-a-plyometric-protocol-potentiates-the-force-generating-capacity-of-the-quadriceps-muscles
#8
Mariska Johnson, J Pierre Baudin, Alejandro L Ley, David F Collins
This study was designed to investigate whether a warm-up routine that incorporates drop jumps, induces post-activation potentiation (PAP), and if so, assess the magnitude and time course of the induced PAP. Participants performed a standard warm-up that incorporated either drop jumps (plyometric protocol) or a low-paced walk (control protocol). PAP was assessed by changes in electrically-evoked isometric muscle twitches recorded throughout both protocols. The plyometric protocol increased peak twitch torque (PTT), rate of force development (RTD) and impulse significantly (by 23%, 39% and 46%, respectively) with no change in the amplitude of simultaneously-evoked M-waves, indicating that the augmented torque was due to PAP...
June 8, 2017: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/28594464/do-changes-in-neuromuscular-activation-contribute-to-the-knee-extensor-angle-torque-relationship
#9
Marcel B Lanza, Thomas G Balshaw, Jonathan P Folland
The influence of joint angle on knee extensor neuromuscular activation is unclear due in part due to the diversity of surface electromyography (sEMG) and/or interpolated twitch technique (ITT) methods employed. The aim of the study was to compare neuromuscular activation, using rigorous contemporary sEMG and ITT procedures, during isometric maximal voluntary contractions (iMVC) of the quadriceps femoris (Q) at different knee-joint angles and examine if activation contributes to the angle-torque relationship...
June 8, 2017: Experimental Physiology
https://www.readbyqxmd.com/read/28592458/localized-and-systemic-variations-in-central-motor-drive-at-different-local-skin-and-muscle-temperatures
#10
Alex Lloyd, Lewis Picton, Margherita Raccuglia, Simon Hodder, George Havenith
This study investigated the ability to sustain quadriceps central motor drive while subjected to localized heat and metaboreceptive feedback from the contralateral leg. Eight active males each completed two counter-balanced trials, in which muscle temperature (Tm) of a single-leg (TEMP-LEG) was altered to 29.4 (COOL) or 37.6°C (WARM), while the contralateral leg (CL-LEG) remained thermoneutral; 35.3 and 35.2°C Tm in COOL and WARM respectively. To activate metaboreceptive feedback, participants first performed one 120-s isometric maximal voluntary contraction (MVC) of the knee extensors in the TEMP-LEG, immediately followed by post-exercise muscle ischemia (PEMI) via femoral blood flow occlusion...
June 7, 2017: American Journal of Physiology. Regulatory, Integrative and Comparative Physiology
https://www.readbyqxmd.com/read/28580400/replacement-of-daily-load-attenuates-but-does-not-prevent-changes-to-the-musculoskeletal-system-during-bed-rest
#11
Peter R Cavanagh, Andrea J Rice, Sara C Novotny, Kerim O Genc, Ricki K Englehaupt, Tammy M Owings, Bryan Comstock, Tamre Cardoso, Hakan Ilaslan, Scott M Smith, Angelo A Licata
The dose-response effects of exercise in reduced gravity on musculoskeletal health have not been well documented. It is not known whether or not individualized exercise prescriptions can be effective in preventing the substantial loss in bone mineral density and muscle function that have been observed in space flight and in bed rest. In this study, typical daily loads to the lower extremities were quantified in free-living subjects who were then randomly assigned to control or exercise groups. Subjects were confined to 6-degree head-down bed rest for 84 days...
December 2016: Bone Reports
https://www.readbyqxmd.com/read/28580253/arthroscopic-patellar-lateral-facetectomy
#12
Marcio B Ferrari, George Sanchez, Jorge Chahla, Gilbert Moatshe, Robert F LaPrade
Isolated patellofemoral osteoarthritis is relatively prevalent, with the lateral facet of the patella being the most commonly affected portion. This pathology can be a result of a patellar maltracking syndrome, patella instability, or idiopathic degenerative changes. A thorough diagnostic work-up with a physical examination and imaging studies are mandatory for a proper diagnosis and to rule out other causes of patellofemoral knee pain. These patients are often treated nonoperatively with exercises for patella mobility, intra-articular injections, braces, patellar tracking, quadriceps balance and strength, and activity modification...
April 2017: Arthroscopy Techniques
https://www.readbyqxmd.com/read/28579089/muscle-strength-and-force-development-in-high-and-low-functioning-elderly-men-influence-of-muscular-and-neural-factors
#13
Charlotte H Pion, Sébastien Barbat-Artigas, Félix St-Jean-Pelletier, Stéphanie Chevalier, Pierrette Gaudreau, Gilles Gouspillou, José A Morais, Marc Bélanger, Mylène Aubertin-Leheudre
BACKGROUND: Aging leads to a loss of muscle strength and functional capacity likely resulting from a combination of neural and muscle alterations. The aim of this study was to identify possible disparities in muscle strength and force development profiles in high- and low-functioning elderly men and to investigate muscular and neurophysiological factors that could explain the differences. METHODS: Sixty community-dwelling men in good general health were divided in two groups based on a functional capacity (FC) z-score derived from 6 tests of the Short Physical Performance Battery and Senior Fitness Test (Normal and fast 4m-walk tests, normal and fast Timed-up and go, chair and stair tests)...
June 1, 2017: Experimental Gerontology
https://www.readbyqxmd.com/read/28573973/knee-flexion-with-quadriceps-cocontraction-a-new-therapeutic-exercise-for-the-early-stage-of-acl-rehabilitation
#14
Andrea Biscarini, Samuele Contemori, Daniele Busti, Fabio M Botti, Vito E Pettorossi
Quadriceps strengthening exercises designed for the early phase of anterior cruciate ligament (ACL) rehabilitation should limit the anterior tibial translation developed by quadriceps contraction near full knee extension, in order to avoid excessive strain on the healing tissue. We hypothesize that knee-flexion exercises with simultaneous voluntary contraction of quadriceps (voluntary quadriceps cocontraction) can yield considerable levels of quadriceps activation while preventing the tibia from translating forward relative to the femur...
December 8, 2016: Journal of Biomechanics
https://www.readbyqxmd.com/read/28570490/a-review-of-the-biomechanical-differences-between-the-high-bar-and-low-bar-back-squat
#15
Daniel J Glassbrook, Eric R Helms, Scott R Brown, Adam G Storey
The back-squat is a common exercise in strength and conditioning, for a variety of sports. It is widely regarded as a fundamental movement to increase and measure lower-body and trunk function, as well as an effective injury rehabilitation exercise. There are typically two different bar positions used when performing the back-squat; the traditional 'high-bar' back-squat (HBBS) and the 'low-bar' back-squat (LBBS). Different movement strategies are employed to ensure that the center-of-mass remains in the base-of-support for balance during the execution of these lifts...
May 30, 2017: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/28566389/does-the-type-of-graft-affect-the-outcome-of-revision-anterior-cruciate-ligament-reconstruction-a-meta-analysis-of-32-studies
#16
REVIEW
A Grassi, M Nitri, S G Moulton, G M Marcheggiani Muccioli, A Bondi, M Romagnoli, S Zaffagnini
AIMS: Our aim was to perform a meta-analysis of the outcomes of revision anterior cruciate ligament (ACL) reconstruction, comparing the use of different types of graft. MATERIALS AND METHODS: A search was performed of Medline and Pubmed using the terms "Anterior Cruciate Ligament" and "ACL" combined with "revision", "re-operation" and "failure". Only studies that reported the outcome at a minimum follow-up of two years were included. Two authors reviewed the papers, and outcomes were subdivided into autograft and allograft...
June 2017: Bone & Joint Journal
https://www.readbyqxmd.com/read/28559195/magnitude-of-deformity-correction-may-influence-recovery-of-quadriceps-strength-after-total-knee-arthroplasty
#17
Brian J Loyd, Jason M Jennings, Jason R Falvey, Raymond H Kim, Douglas A Dennis, Jennifer E Stevens-Lapsley
BACKGROUND: Malalignment of the lower extremity is commonly seen in patients with severe osteoarthritis undergoing total knee arthroplasty (TKA) and is believed to play a role in quadriceps strength loss. Deformity correction is typically achieved through surgical techniques to provide appropriate ligamentous balancing. Therefore, this study examined the influence of change in lower extremity alignment on quadriceps strength outcomes after TKA. METHODS: Seventy-three participants (36 male; mean age, 62 years; and mean body mass index, 29...
April 27, 2017: Journal of Arthroplasty
https://www.readbyqxmd.com/read/28555052/blackcurrant-alters-physiological-responses-and-femoral-artery-diameter-during-sustained-isometric-contraction
#18
Matthew David Cook, Stephen David Myers, Mandy Lucinda Gault, Mark Elisabeth Theodorus Willems
Blackcurrant is rich in anthocyanins that may affect exercise-induced physiological responses. We examined tissue oxygen saturation, muscle activity, cardiovascular responses and femoral artery diameter during a submaximal sustained isometric contraction. In a randomised, double-blind, crossover design, healthy men (n = 13, age: 25 ± 4 years, BMI: 25 ± 3 kg·m(-2), mean ± SD) ingested New Zealand blackcurrant (NZBC) extract (600 mg∙day(-1) CurraNZ™) or placebo (PL) for 7-days separated by 14-days washout...
May 29, 2017: Nutrients
https://www.readbyqxmd.com/read/28552496/effects-of-novel-guidance-tubing-gait-on-emg-neuromuscular-imbalance-and-joint-angular-kinematics-during-locomotion-in-hemiparetic-stroke-patients
#19
Jeong J Lee, Joshua Sung H You
OBJECTIVE: To compare the immediate effects of conventional treadmill gait (CTG) and guidance tubing gait (GTG) on electromyographic (EMG) neuromuscular imbalance and knee joint kinematics in hemiparetic gait. DESIGN: Case control study. SETTING: University medical center. PARTICIPANTS: Eighteen patients with hemiparetic stroke (18 experimental, mean (SD) age 39.2 (16.8) years) and 15 healthy controls, mean age 26.3 (2...
May 25, 2017: Archives of Physical Medicine and Rehabilitation
https://www.readbyqxmd.com/read/28552031/the-hybrid-assistive-limb%C3%A2-intervention-for-a-postoperative-patient-with-spinal-dural-arteriovenous-fistula-and-chronic-spinal-cord-injury-a-case-study
#20
Yukiyo Shimizu, Kei Nakai, Hideki Kadone, Shunsuke Yamauchi, Shigeki Kubota, Tomoyuki Ueno, Aiki Marushima, Kayo Hiruta, Ayumu Endo, Hiroaki Kawamoto, Akira Matsumura, Yoshiyuki Sankai, Yasushi Hada, Masashi Yamazaki
CONTEXT: The purpose of this report was to describe the improvement in walking ability using the Hybrid Assistive Limb® (HAL®) intervention in the case of a patient with paraplegia after spinal cord injury whose condition deteriorated because of a spinal dural arteriovenous fistula (SDAVF). FINDINGS: A 48-year-old man started the HAL® intervention twice per week (total 10 sessions), after his neurologic improvement had plateaued from 3 to 6 months postoperatively for an SDAVF...
May 29, 2017: Journal of Spinal Cord Medicine
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