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eccentric overload

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https://www.readbyqxmd.com/read/27899894/moderate-load-eccentric-exercise-a-distinct-novel-training-modality
#1
REVIEW
Hans Hoppeler
Over the last 20 years a number of studies have been published using progressive eccentric exercise protocols on motorized ergometers or similar devices that allow for controlled application of eccentric loads. Exercise protocols ramp eccentric loads over an initial 3 weeks period in order to prevent muscle damage and delayed onset muscle soreness. Final training loads reach 400-500 W in rehabilitative settings and over 1200 W in elite athletes. Training is typically carried out three times per week for durations of 20-30 min...
2016: Frontiers in Physiology
https://www.readbyqxmd.com/read/27705034/the-high-pull-exercise-a-comparison-between-a-versapulley-flywheel-device-and-the-free-weight
#2
F Javier Núñez, Luis J Suarez-Arrones, Paul Cater, Alberto Mendez-Villanueva
The aim of this study was to examine the kinematics and kinetics (force, velocity and acceleration) and blood lactate concentration of the Versapulley (VP) device in comparison with free weight (FW) exercise at a similar external load. Fifteen rugby players randomly performed two training sessions of 6 sets of 6 repetitions with 20 s of recovery in between sets of the high pull exercise with the VP and the FW. Both training sessions were separated by 72 h. Barbell displacement (cm.), peak velocity (m/s), peak acceleration (m/s(2)), mean propulsive velocity (m/s), mean propulsive acceleration (m/s(2)), propulsive phase (%), mean and maximal force (Newtons) were continuously recorded during each repetition...
September 6, 2016: International Journal of Sports Physiology and Performance
https://www.readbyqxmd.com/read/27669183/effects-of-inertial-setting-on-power-force-work-and-eccentric-overload-during-flywheel-resistance-exercise-in-women-and-men
#3
Luis Manuel Martinez-Aranda, Rodrigo Fernandez-Gonzalo
Exercise load is a key component in determining end-point adaptations to resistance exercise. Yet, there is no information regarding the use of different inertia (i.e. loads) during iso-inertial flywheel resistance exercise, a very popular high-intensity training model. Thus, this study examined power, work, force and eccentric-overload produced during flywheel resistance exercise with different inertial settings in men and women. Twenty-two women (n=11) and men (n=11) performed unilateral (in both legs) isolated concentric (CON) and coupled CON and eccentric (ECC) exercise in a flywheel knee extension device employing six inertias (0...
September 16, 2016: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/27663100/sex-specific-effects-of-adrenergic-induced-left-ventricular-remodeling-in-spontaneously-hypertensive-rats
#4
Frederic S Michel, Mhlengi Magubane, Lebogang Mokotedi, Gavin R Norton, Angela J Woodiwiss
AIM: To determine whether adrenergic-induced left ventricular (LV) dilatation and eccentric remodeling in pressure-overload hypertrophy is sex-specific. METHODS AND RESULTS: Chronic β-adrenoreceptor activation was produced in male and female spontaneously hypertensive rats (SHR) by daily administration of isoproterenol (ISO, 0.04 mg/kg.day) from 9 to 15 months of age. LV chamber dimensions were determined in vivo by echocardiography and ex vivo in isolated perfused heart preparations...
September 20, 2016: Journal of Cardiac Failure
https://www.readbyqxmd.com/read/27618131/the-high-pull-exercise-a-comparison-between-a-versapulley-flywheel-device-and-the-free-weight
#5
F Javier Núñez, Luis J Suarez-Arrones, Paul Cater, Alberto Mendez-Villanueva
The aim of this study was to examine the kinematics and kinetics (force, velocity and acceleration) and blood lactate concentration of the Versapulley (VP) device in comparison with free weight (FW) exercise at a similar external load. Fifteen rugby players randomly performed two training sessions of 6 sets of 6 repetitions with 20 s of recovery in between sets of the high pull exercise with the VP and the FW. Both training sessions were separated by 72 h. Barbell displacement (cm.), peak velocity (m/s), peak acceleration (m/s2), mean propulsive velocity (m/s), mean propulsive acceleration (m/s2), propulsive phase (%), mean and maximal force (Newtons) were continuously recorded during each repetition...
September 6, 2016: International Journal of Sports Physiology and Performance
https://www.readbyqxmd.com/read/27614172/current-perspectives-on-left-ventricular-geometry-in-systemic-hypertension
#6
Ahmet Afşin Oktay, Carl J Lavie, Richard V Milani, Hector O Ventura, Yvonne E Gilliland, Sangeeta Shah, Michael E Cash
Hypertension (HTN) is a global health problem and a leading risk factor for cardiovascular disease (CVD) morbidity and mortality. The hemodynamic overload from HTN causes left ventricular (LV) remodeling, which usually manifests as distinct alterations in LV geometry, such as concentric remodeling or concentric and eccentric LV hypertrophy (LVH). In addition to being a common target organ response to HTN, LV geometric abnormalities are well-known independent risk factors for CVD. Because of their prognostic implications and quantifiable nature, changes in LV geometric parameters have commonly been included as an outcome in anti-HTN drug trials...
September 8, 2016: Progress in Cardiovascular Diseases
https://www.readbyqxmd.com/read/27610087/changes-in-myocardial-composition-and-conduction-properties-in-rat-heart-failure-model-induced-by-chronic-volume-overload
#7
David Sedmera, Jan Neckar, Jiri Benes, Jana Pospisilova, Jiri Petrak, Kamil Sedlacek, Vojtech Melenovsky
Volume overload leads to development of eccentric cardiac hypertrophy and heart failure. In our previous report, we have shown myocyte hypertrophy with no fibrosis and decrease in gap junctional coupling via connexin43 in a rat model of aorto-caval fistula at 21 weeks. Here we set to analyze the electrophysiological and protein expression changes in the left ventricle and correlate them with phenotypic severity based upon ventricles to body weight ratio. ECG analysis showed increased amplitude and duration of the P wave, prolongation of PR and QRS interval, ST segment elevation and decreased T wave amplitude in the fistula group...
2016: Frontiers in Physiology
https://www.readbyqxmd.com/read/27575931/echocardiographic-findings-in-haemodialysis-patients-according-to-their-state-of-hydration
#8
María Cristina Di Gioia, Raul Gascuena, Paloma Gallar, Gabriela Cobo, Rosa Camacho, Nuria Acosta, Zsofia Baranyi, Isabel Rodriguez, Aniana Oliet, Olimpia Ortega, Inmaculada Fernandez, Carmen Mon, Milagros Ortiz, Mari C Manzano, Juan C Herrero, José I Martinez, Joaquín Palma, Ana Vigil
BACKGROUND: Chronic fluid overload is frequent in hemodialysis patients (P) and it associates with hypertension, left ventricular hypertrophy (LVH) and higher mortality. Moreover, echocardiographic data assessing fluid overload is limited. Our aim was to evaluate the relationship between fluid overload measured by bioimpedance spectroscopy (BIS) and different echocardiographic parameters. METHODS: Cross-sectional observational study including 76 stable patients...
August 26, 2016: Nefrología: Publicación Oficial de la Sociedad Española Nefrologia
https://www.readbyqxmd.com/read/27294501/genetic-variation-and-exercise-induced-muscle-damage-implications-for-athletic-performance-injury-and-ageing
#9
REVIEW
Philipp Baumert, Mark J Lake, Claire E Stewart, Barry Drust, Robert M Erskine
Prolonged unaccustomed exercise involving muscle lengthening (eccentric) actions can result in ultrastructural muscle disruption, impaired excitation-contraction coupling, inflammation and muscle protein degradation. This process is associated with delayed onset muscle soreness and is referred to as exercise-induced muscle damage. Although a certain amount of muscle damage may be necessary for adaptation to occur, excessive damage or inadequate recovery from exercise-induced muscle damage can increase injury risk, particularly in older individuals, who experience more damage and require longer to recover from muscle damaging exercise than younger adults...
September 2016: European Journal of Applied Physiology
https://www.readbyqxmd.com/read/27234427/proteomic-analysis-of-short-term-preload-induced-eccentric-cardiac-hypertrophy
#10
Belal A Mohamed, Abdul R Asif, Moritz Schnelle, Mohamed Qasim, Sara Khadjeh, Dawid Lbik, Peter Schott, Gerd Hasenfuss, Karl Toischer
BACKGROUND: Hemodynamic load leads to cardiac hypertrophy and heart failure. While afterload (pressure overload) induces concentric hypertrophy, elevation of preload (volume overload) yields eccentric hypertrophy and is associated with a better outcome. Here we analysed the proteomic pattern of mice subjected to short-term preload. METHODS AND RESULTS: Female FVB/N mice were subjected to aortocaval shunt-induced volume overload that leads to an eccentric hypertrophy (left ventricular weight/tibia length +31 %) with sustained systolic heart function at 1 week after operation...
2016: Journal of Translational Medicine
https://www.readbyqxmd.com/read/27107489/exposure-to-chronic-alcohol-accelerates-development-of-wall-stress-and-eccentric-remodeling-in-rats-with-volume-overload
#11
Alan J Mouton, Van K Ninh, Elia C El Hajj, Milad C El Hajj, Nicholas W Gilpin, Jason D Gardner
Chronic alcohol abuse is one of the leading causes of dilated cardiomyopathy (DCM) in the United States. Volume overload (VO) also produces DCM characterized by left ventricular (LV) dilatation and reduced systolic and diastolic function, eventually progressing to congestive heart failure. For this study, we hypothesized that chronic alcohol exposure would exacerbate cardiac dysfunction and remodeling due to VO. Aortocaval fistula surgery was used to induce VO, and compensatory cardiac remodeling was allowed to progress for either 3days (acute) or 8weeks (chronic)...
August 2016: Journal of Molecular and Cellular Cardiology
https://www.readbyqxmd.com/read/27052303/muscle-functional-and-cognitive-adaptations-after-flywheel-resistance-training-in-stroke-patients-a-pilot-randomized-controlled-trial
#12
RANDOMIZED CONTROLLED TRIAL
Rodrigo Fernandez-Gonzalo, Sol Fernandez-Gonzalo, Marc Turon, Cristina Prieto, Per A Tesch, Maria del Carmen García-Carreira
BACKGROUND: Resistance exercise (RE) improves neuromuscular function and physical performance after stroke. Yet, the effects of RE emphasizing eccentric (ECC; lengthening) actions on muscle hypertrophy and cognitive function in stroke patients are currently unknown. Thus, this study explored the effects of ECC-overload RE training on skeletal muscle size and function, and cognitive performance in individuals with stroke. METHODS: Thirty-two individuals with chronic stroke (≥6 months post-stroke) were randomly assigned into a training group (TG; n = 16) performing ECC-overload flywheel RE of the more-affected lower limb (12 weeks, 2 times/week; 4 sets of 7 maximal closed-chain knee extensions; <2 min of contractile activity per session) or a control group (CG; n = 16), maintaining daily routines...
April 6, 2016: Journal of Neuroengineering and Rehabilitation
https://www.readbyqxmd.com/read/27025305/echocardiographic-diagnosis-and-necropsy-findings-of-a-congenital-ventricular-septal-defect-in-a-stranded-harbor-porpoise
#13
Viktor Szatmári, Paulien Bunskoek, Thijs Kuiken, Annemarie van den Berg, Cornelis van Elk
A live-stranded harbor porpoise Phocoena phocoena was found on the west coast of the Dutch island Texel (North Sea) and transported to a rehabilitation center for small cetaceans, where it underwent a veterinary health check. Cardiac auscultation revealed a systolic cardiac murmur with the point of maximal intensity in the right hemithorax with an intensity of IV out of VI. Transthoracic echocardiography revealed a congenital ventricular septal defect with left-to-right shunting. Because the left atrium was not dilated according to the reference range of canine left atrium to aortic ratio, the presence of congestive heart failure was considered very unlikely...
March 30, 2016: Diseases of Aquatic Organisms
https://www.readbyqxmd.com/read/26963941/effects-of-10-week-eccentric-overload-training-on-kinetic-parameters-during-change-of-direction-in-football-players
#14
Moisés de Hoyo, Borja Sañudo, Luis Carrasco, Jesús Mateo-Cortes, Sergio Domínguez-Cobo, Orlando Fernandes, Juan J Del Ojo, Oliver Gonzalo-Skok
The aim of the current study was to analyse the effect of 10-week eccentric overload training on kinetic parameters during change of direction (COD) in U-19 football players. The outcome measured included relative peak braking (rPB) and propulsive force (rPF), contact time (CT), time spent during braking (BT) and propulsive phase (PT), relative total (rTOT_IMP), braking (rB_IMP) and propulsive (rP_IMP) impulses. Between-group results showed a substantial better improvement (likely) in CT (ES: 0.72) and BT (ES: 0...
July 2016: Journal of Sports Sciences
https://www.readbyqxmd.com/read/26962206/maternal-cardiovascular-function-in-normal-pregnancy-evidence-of-maladaptation-to-chronic-volume-overload
#15
COMPARATIVE STUDY
Karen Melchiorre, Rajan Sharma, Asma Khalil, Baskaran Thilaganathan
The aim of this study was to investigate cardiac functional status in pregnancy using a comprehensive approach taking into account the simultaneous changes in loading and geometry, as well as maternal age and anthropometric indices. This was a prospective cross-sectional study of 559 nulliparous pregnant women assessed at 4 time points during pregnancy and at 1 year postpartum. All women underwent conventional echocardiography and tissue Doppler velocities and strain rate analysis at multiple cardiac sites...
April 2016: Hypertension
https://www.readbyqxmd.com/read/26945212/fatigue-fracture-of-the-calcaneus-from-early-diagnosis-to-treatment-a-case-report-of-a-triathlon-athlete
#16
Simão Serrano, Pedro Figueiredo, João Páscoa Pinheiro
Stress fractures are frequently underdiagnosed and undertreated despite being common in sports. Early diagnosis is crucial; therefore, a high index of clinical suspicion is required. Complementary examinations are essential for diagnosis and follow-up. The authors report a clinical case of a young adult triathlon athlete referring mechanical pain in the rear left foot, with 2 weeks' progression. An earlier increase in daily training intensity was recorded. Complementary examinations confirmed a calcaneal fatigue fracture...
June 2016: American Journal of Physical Medicine & Rehabilitation
https://www.readbyqxmd.com/read/26792340/muscle-structural-assembly-and-functional-consequences
#17
REVIEW
Marco Narici, Martino Franchi, Constantinos Maganaris
The relationship between muscle structure and function has been a matter of investigation since the Renaissance period. Extensive use of anatomical dissections and the introduction of the scientific method enabled early scholars to lay the foundations of muscle physiology and biomechanics. Progression of knowledge in these disciplines led to the current understanding that muscle architecture, together with muscle fibre contractile properties, has a major influence on muscle mechanical properties. Recently, advances in laser diffraction, optical microendoscopy and ultrasonography have enabled in vivo investigations into the behaviour of human muscle fascicles and sarcomeres with varying joint angle and muscle contraction intensity...
January 2016: Journal of Experimental Biology
https://www.readbyqxmd.com/read/26677829/ultrasound-changes-in-achilles-tendon-and-gastrocnemius-medialis-muscle-on-squat-eccentric-overload-and-running-performance
#18
Fernando Sanz-López, César Berzosa Sánchez, Fidel Hita-Contreras, David Cruz-Diaz, Antonio Martínez-Amat
Sanz-López, F, Berzosa Sánchez, C, Hita-Contreras, F, Cruz-Diaz, D, and Martínez-Amat, A. Ultrasound changes in Achilles tendon and gastrocnemius medialis muscle on squat eccentric overload and running performance. J Strength Cond Res XX(X): 000-000, 2015-Previous studies have proven the adaptation to load in the Achilles tendon and gastrocnemius muscle after different types of exercise, such as running, heel drop training, and a variety of sports. These findings have been applied to improve performance and in the treatment and prevention of overuse injuries...
July 2016: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/26670989/effects-of-in-season-inertial-resistance-training-with-eccentric-overload-in-a-sports-population-at-risk-for-patellar-tendinopathy
#19
Gabriel Gual, Azahara Fort-Vanmeerhaeghe, Daniel Romero-Rodríguez, Per A Tesch
Gual, G, Fort-Vanmeerhaeghe, A, Romero-Rodríguez, D, and Tesch, PA. Effects of in-season inertial resistance training with eccentric overload in a sports population at risk for patellar tendinopathy. J Strength Cond Res 30(7): 1834-1842, 2016-Volleyball and basketball players can be considered as a population at risk for patellar tendinopathy. Given the paradox that eccentric training elicits therapeutic benefits yet might provoke such injury, we investigated the influence of a weekly bout of inertial squat resistance exercise offering eccentric overload on lower limb muscle power and patellar tendon complaints...
July 2016: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/26653869/sex-differences-in-aortic-stenosis-and-outcome-following-surgical-and-transcatheter-aortic-valve-replacement
#20
Laura E Dobson, Timothy A Fairbairn, Sven Plein, John P Greenwood
Aortic stenosis is the commonest valve defect in the developed world and is associated with a high mortality once symptomatic. There is a difference in the way that male and female hearts remodel in the face of chronic pressure overload: women develop a concentrically hypertrophied, small cavity left ventricle (LV), whereas men are more prone to the development of eccentric hypertrophy. At a cellular level, there is an increase in collagen and metalloproteinase gene expression in males suggesting a different regulation of extracellular volume composition according to sex...
December 2015: Journal of Women's Health
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