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Eccentring resistance training

Michael E Holmstrup, Brock T Jensen, William S Evans, Emily C Marshall
The kettlebell swing (KBS), emphasizing cyclical, explosive hip extension in the horizontal plane, aligns with movement- and velocity-specificity of sprinting. The present study examined the effect of an eight-week KBS intervention on sprinting in recreationally-active females, in comparison to an eight-week intervention using the stiff-legged deadlift (SDL). Following a pre-testing session measuring 30 meter sprint and countermovement vertical jump performance, participants were divided evenly by sprint time into KBS (n=8) and SDL (n=10) cohorts...
2016: International Journal of Exercise Science
Gert Ulrich, Mario Parstorfer
PURPOSE: There is limited data on postactivation potentiation (PAP) effects following plyometric conditioning contractions (CC), especially in the upper body. Therefore, the study compared plyometric CC with concentric-eccentric and eccentric CC aiming to improve upper body power performance due to a PAP-effect. METHODS: Sixteen resistance-trained males completed three experimental trials in a randomized order which composed of either a plyometric (PLY), a concentric-eccentric (CON) or an eccentric-only (ECC) CC...
October 13, 2016: International Journal of Sports Physiology and Performance
James Peter Fisher, Luke Carlson, James Steele
Research has produced equivocal results with regard to eccentric (ECC) only compared with traditional concentric/eccentric resistance training (RT). When considered in relation to load- and repetition duration-accentuated (ECC) training as well as the use of isokinetic and isoinertial training methods, there is a relative dearth of literature considering multi-joint, multi-exercise RT interventions. The present study considered 59 male and female participants randomly divided in to 3 sex counterbalanced groups; ECC only (ECC, n = 20), repetition duration-accentuated ECC (ECC-A, n = 20), and traditional (CON, n = 19) performing full-body, effort matched RT programmes for 2 days·week(-1) for 10 weeks...
June 22, 2016: Applied Physiology, Nutrition, and Metabolism, Physiologie Appliquée, Nutrition et Métabolisme
Satoru Ato, Yuhei Makanae, Kohei Kido, Satoshi Fujita
Resistance training with eccentric contraction has been shown to augment muscle hypertrophy more than other contraction modes do (i.e., concentric and isometric contraction). However, the molecular mechanisms involved remain unclear. The purpose of this study was to investigate the effect of muscle contraction mode on mammalian target of rapamycin complex 1 (mTORC1) signaling using a standardized force-time integral (load (weight) × contraction time). Male Sprague-Dawley rats were randomly assigned to three groups: eccentric contraction, concentric contraction, and isometric contraction...
October 2016: Physiological Reports
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
Kevin A Murach, R Grace Walton, Christopher S Fry, Sami L Michaelis, Jason S Groshong, Brian S Finlin, Philip A Kern, Charlotte A Peterson
This investigation evaluated whether moderate-intensity cycle ergometer training affects satellite cell and molecular responses to acute maximal concentric/eccentric resistance exercise in middle-aged women. Baseline and 72 h postresistance exercise vastus lateralis biopsies were obtained from seven healthy middle-aged women (56 ± 5 years, BMI 26 ± 1, VO2max 27 ± 4) before and after 12 weeks of cycle training. Myosin heavy chain (MyHC) I- and II-associated satellite cell density and cross-sectional area was determined via immunohistochemistry...
September 2016: Physiological Reports
Jamie Douglas, Simon Pearson, Angus Ross, Mike McGuigan
BACKGROUND: Resistance training is an integral component of physical preparation for athletes. A growing body of evidence indicates that eccentric strength training methods induce novel stimuli for neuromuscular adaptations. OBJECTIVE: The purpose of this systematic review was to determine the effects of eccentric training in comparison to concentric-only or traditional (i.e. constrained by concentric strength) resistance training. METHODS: Searches were performed using the electronic databases MEDLINE via EBSCO, PubMed and SPORTDiscus via EBSCO...
September 19, 2016: Sports Medicine
Jacob E Earp, Robert U Newton, Prue Cormie, Anthony J Blazevich
INTRODUCTION: Tendon dynamics influence movement performance and provide the stimulus for long-term tendon adaptation. As tendon strain increases with load magnitude and decreases with loading rate, changes in movement speed during exercise should influence tendon strain. METHODS: Ten resistance-trained men [squat one repetition maximum (1RM) to body mass ratio: 1.65 ± 0.12] performed parallel-depth back squat lifts with 60% of 1RM load at three different speeds: slow fixed-tempo (TS: 2-s eccentric, 1-s pause, 2-s concentric), volitional-speed without a pause (VS) and maximum-speed jump (JS)...
2016: Frontiers in Physiology
Kenny Guex, Francis Degache, Cynthia Morisod, Matthieu Sailly, Gregoire P Millet
Most common preventive eccentric-based exercises, such as Nordic hamstring do not include any hip flexion. So, the elongation stress reached is lower than during the late swing phase of sprinting. The aim of this study was to assess the evolution of hamstring architectural (fascicle length and pennation angle) and functional (concentric and eccentric optimum angles and concentric and eccentric peak torques) parameters following a 3-week eccentric resistance program performed at long (LML) vs. short muscle length (SML)...
2016: Frontiers in Physiology
Lee A Bridgeman, Michael R McGuigan, Nicholas D Gill, Deborah K Dulson
The purpose of this study was to investigate the relationships between concentric and eccentric peak force (PF) and countermovement jump (CMJ) performance in resistance-trained men. Subjects were 12 men (mean ± SD; age: 25.4 ± 3.5 years; height: 177.2 ± 4.5 cm; mass: 84.0 ± 10.1 kg). The subjects were tested for concentric and eccentric PF using the Exerbotics squat device. Subjects then completed 3 CMJs to allow for the calculation of peak power (PP), peak ground reaction force (PGRF) and jump height (JH)...
July 18, 2016: Journal of Strength and Conditioning Research
Bruno Manfredini Baroni, Marcelo Gava Pompermayer, Anelize Cini, Amanda Stortti Peruzzolo, Régis Radaelli, Clarissa Müller Brusco, Ronei Silveira Pinto
Load and range of motion (ROM) applied in resistance training (RT) affect the muscle damage magnitude and the recovery time-course. Since exercises performed with partial ROM allow a higher load compared to those with full ROM, this study investigated the acute effect of a traditional RT exercise using full ROM or partial ROM on muscle damage markers. Fourteen healthy men performed four sets of 10 concentric-eccentric repetitions of unilateral elbow flexion at the Scott bench. Arms were randomly assigned to partial ROM (50° to 100°) and full ROM (0° to 130°) conditions, and load was determined as 80% of one repetition maximum in full and partial ROM tests...
July 7, 2016: Journal of Strength and Conditioning Research
Stephan Geisler, Andreas H Alt, Thorsten Kreutz
No abstract text is available yet for this article.
May 2016: Medicine and Science in Sports and Exercise
Thomas J Hemmings, Kristina Kendall, John L Dobson
The purpose of this study was to compare the effects of various dosages of light emitting diode therapy (LEDT) on muscle fatigue, while performing a single leg extension to exhaustion. A total of 34 recreationally resistance trained athletes between the ages of 18 and 26 participated in four trials. Each trial included pre/post exercise blood lactate measurements and two sets of three maximal voluntary isometric contractions (MVIC), followed by LEDT on six points across the superficial quadriceps. Each randomized trial consisted of a placebo, 30 seconds, 60 seconds or 120 seconds on each point on the quadriceps...
June 27, 2016: Journal of Strength and Conditioning Research
Damiano Formenti, Nicola Ludwig, Athos Trecroci, Marco Gargano, Giovanni Michielon, Andrea Caumo, Giampietro Alberti
Low intensity resistance training with slow movement and tonic force generation has been shown to create blood flow restriction within muscles that may affect thermoregulation through the skin. We aimed to investigate the influence of two speeds of exercise execution on skin temperature dynamics using infrared thermography. Thirteen active males performed randomly two sessions of squat exercise (normal speed, 1s eccentric/1s concentric phase, 1s; slow speed, 5s eccentric/5s concentric phase, 5s), using ~50% of 1 maximal repetition...
July 2016: Journal of Thermal Biology
Simon Walker, Anthony J Blazevich, G Gregory Haff, James J Tufano, Robert U Newton, Keijo Häkkinen
As training experience increases it becomes more challenging to induce further neuromuscular adaptation. Consequently, strength trainers seek alternative training methods in order to further increase strength and muscle mass. One method is to utilize accentuated eccentric loading, which applies a greater external load during the eccentric phase of the lift as compared to the concentric phase. Based upon this practice, the purpose of this study was to determine the effects of 10 weeks of accentuated eccentric loading vs...
2016: Frontiers in Physiology
Bradley A DeFOREST, Gregory S Cantrell, Brian K Schilling
Muscular activity, vertical displacement and ground reaction forces of back squats (BS), rear-leg elevated split squats (RLESS) and split squats (SS) were examined. Nine resistance-trained men reported for two sessions. The first session consisted of the consent process, practice, and BS 1-repetition maximum testing. In the second session, participants performed the three exercises while EMG, displacment and ground reaction force data (one leg on plate) were collected. EMG data were collected from the gluteus maximus (GMX), biceps femoris (BF), semitendinosus (ST), rectus femoris (RF), vastus lateralis (VL), vastus medialis (VM), tibialis anterior (TA), and medial gastrocnemius (MGas) of the left leg (non-dominant, front leg for unilateral squats)...
2014: International Journal of Exercise Science
Scott A Mazzetti, Christopher Wolff, Brittany Collins, Michael T Kolankowski, Brittany Wilkerson, Matthew Overstreet, Troy Grube
With resistance exercise, greater intensity typically elicits increased energy expenditure, but heavier loads require that the lifter perform more sets of fewer repetitions, which alters the kilograms lifted per set. Thus, the effect of exercise-intensity on energy expenditure has yielded varying results, especially with explosive resistance exercise. This study was designed to examine the effect of exercise-intensity and kilograms/set on energy expenditure during explosive resistance exercise. Ten resistance-trained men (22±3...
2011: International Journal of Exercise Science
Kimberly Arnsdorff, Ken Limbaugh, Bryan L Riemann
Prior research revealed activation differences between the medial (MG) and lateral (LG) gastrocnemius when performing heel raise exercise with neutral (N), internally-rotated (IR) and externally-rotated (ER) foot positions. Studying underlying biomechanics may help explain activation differences. The purpose was to compare ankle (AN), knee (KN), and hip (HI) contributions (initial joint angles) to attaining each initial foot position, ankle flexion-extension range of motion, ankle mechanical energy expenditure, repetition time, and percent cycle concentric-eccentric transition between N, IR, and ER foot positions...
2011: International Journal of Exercise Science
Timothy Hasenoehrl, Barbara Wessner, Harald Tschan, Claudia Vidotto, Richard Crevenna, Robert Csapo
BACKGROUND: The aim of the present study was to assess the role of eccentric exercise intensity in the development of and recovery from delayed onset muscle soreness (DOMS). METHODS: Using a cross-over study design, 15 healthy, male college students were tested on two occasions. The training stimulus consisted of an exhaustive series of eccentric muscle contractions of the elbow flexors at either 100% (high intensity) or 50% (low intensity) of the individual concentric one-repetition maximum...
May 11, 2016: Journal of Sports Medicine and Physical Fitness
Brad J Schoenfeld, Dan Ogborn, James W Krieger
BACKGROUND: A number of resistance training (RT) program variables can be manipulated to maximize muscular hypertrophy. One variable of primary interest in this regard is RT frequency. Frequency can refer to the number of resistance training sessions performed in a given period of time, as well as to the number of times a specific muscle group is trained over a given period of time. OBJECTIVE: We conducted a systematic review and meta-analysis to determine the effects of resistance training frequency on hypertrophic outcomes...
April 21, 2016: Sports Medicine
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