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Eccentric strength

Francisco L Pestaña-Melero, Slobodan Jaric, Alejandro Pérez-Castilla, Francisco J Rojas, Amador García-Ramos
Pestaña-Melero, FL, Jaric, S, Pérez-Castilla, A, Rojas, FJ, and García-Ramos A. Comparison of mechanical outputs between the traditional and ballistic bench press: role of the type of variable. J Strength Cond Res XX(X): 000-000, 2018-This study aimed to comprehensively explore the differences in mechanical outputs between the bench press (BP) and the bench press throw (BPT) exercises performed by 21 men (age: 22.0 ± 4.2 years, body mass: 73.4 ± 7.7 kg, height: 177.2 ± 8.0 cm, and concentric-only [C-O] BP 1 repetition maximum: 81...
June 19, 2018: Journal of Strength and Conditioning Research
Michal Lehnert, Mark De Ste Croix, Zuzana Xaverova, Michal Botek, Renata Varekova, Amr Zaatar, Ondrej Lastovicka, Petr Stastny
The aim of this study was to examine the acute effects of soccer specific fatigue on muscular and neuromuscular function in male youth soccer players. Elite soccer players (n = 20; age 15.7 ± 0.5 y; body height 177.75 ± 6.61 cm; body mass 67.28 ± 8.29 kg) were measured before and after soccer specific exercise (SAFT90 ). The reactive strength index (RSI) was determined by a drop jump test, leg stiffness (LS) by a 20 sub-maximal two-legged hopping test, and a functional hamstring to quadriceps strength ratio from isokinetic concentric and eccentric strength of the dominant and non-dominant leg (measured at angular velocities of 1...
June 2018: Journal of Human Kinetics
Francisco Cuenca-Fernández, Ana Ruiz-Teba, Gracia López-Contreras, Raúl Arellano
Cuenca-Fernández, F, Ruiz-Teba, A, López-Contreras, G, and Arellano, R. Effects of 2 types of activation protocols based on postactivation potentiation on 50-m freestyle performance. J Strength Cond Res XX(X): 000-000, 2018-Postactivation potentiation (PAP) is a phenomenon which improves muscle contractility, strength, and speed in sporting performances through previously applied maximal or submaximal loads on the muscle system. This study aimed to assess the effects of 2 types of activation protocols based on PAP, on sprint swimming performance...
June 14, 2018: Journal of Strength and Conditioning Research
Frank A Bourgeois, Paul Gamble, Nic D Gill, Mike R McGuigan
This study investigated the effects of eccentric phase-emphasis strength training (EPE) on unilateral strength and performance in 180- and 45-degree change of direction (COD) tasks in rugby union players. A 12-week cross-over design was used to compare the efficacy of resistance training executed with 3 s eccentric duration (EPE, n = 12) against conventional strength training, with no constraints on tempo (CON, n = 6). Players in each condition were categorised as 'fast' (FAST) or 'slow' (SLOW) using median trial times from baseline testing...
October 24, 2017: Sports
Julia R Schneider, Kevin Kwan, Kay O Kulason, Lukas J Faltings, Stephanie Colantonio, Scott Safir, Tina Loven, Jian Yi Li, Karen S Black, B Todd Schaeffer, Mark B Eisenberg
Background: Amyloidosis encompasses a group of disorders sharing the common feature of intercellular deposition of amyloid protein by several different pathogenetic mechanisms. Primary solitary amyloidosis, or amyloidoma, is a rare subset of amyloidosis in which amyloid deposition is focal and not secondary to a systemic process or plasma cell dyscrasia. Case Description: This 84-year-old female presented with history of multiple syncopal episodes, dysphagia, and ataxia...
2018: Surgical Neurology International
Richard A Brindle, Clare E Milner
Insufficient hip neuromuscular control may contribute to non-contact sport injuries. However, the current evaluative test of hip neuromuscular control, the single-leg squat, requires hip abductor muscle strength to complete. The purpose of this study was to develop the hip control test (HCT) and determine the test's reliability and construct validity. Nineteen healthy adults visited the laboratory twice. The HCT is a 10-s test of reciprocal toe-tapping accuracy. Both automated and manual HCT ratings were recorded simultaneously during each visit...
June 13, 2018: Sports Biomechanics
Daisuke Tatebayashi, Koichi Himori, Ryotaro Yamada, Yuki Ashida, Mitsunori Miyazaki, Takashi Yamada
Eccentric (ECC) contractions are used to maintain skeletal muscle mass and strength in healthy subjects and patients. Here we investigated the effects of ECC training induced by electrical stimulation (ES) on muscle wasting in colon 26 (C-26) tumor-bearing mice. Mice were divided into four groups: control (CNT), CNT + ECC, C-26, and C-26 + ECC. Cancer cachexia was induced by a subcutaneous injection of C-26 cells and developed for four weeks. In experiment 1, muscle protein synthesis rate and mammalian target of rapamycin complex (mTORC) 1 signaling were investigated six hours after one bout of ECC-ES (2 s contraction given every 6 s, 20°/s, 4 sets of 5 contractions)...
2018: PloS One
Anne A G Aune, Chris Bishop, Anthony N Turner, Kostas Papadopoulos, Sarah Budd, Mark Richardson, Sean J Maloney
Foam rolling and eccentric exercise interventions have been demonstrated to improve range of motion (ROM). However, these two modalities have not been directly compared. Twenty-three academy soccer players (age: 18 ± 1; height: 1.74 ± 0.08 m; body mass: 69.3 ± 7.5 kg) were randomly allocated to either a foam rolling (FR) or eccentric exercise intervention designed to improve dorsiflexion ROM. Participants performed the intervention daily for a duration of four weeks. Measurements of dorsiflexion ROM, isometric plantar flexion torque and drop jump reactive strength index were taken at baseline (pre-intervention) and at three subsequent time-points (30-min post, 24-hours post and 4-weeks post)...
June 12, 2018: Journal of Sports Sciences
Wade J Chalker, Anthony J Shield, David A Opar, Evelyne N Rathbone, Justin W L Keogh
Background: Hamstring strain injuries (HSI) are one of the most prevalent and serious injuries affecting athletes, particularly those in team ball sports or track and field. Recent evidence demonstrates that eccentric knee flexor weakness and between limb asymmetries are possible risk factors for HSIs. While eccentric hamstring resistance training, e.g. the Nordic hamstring exercise (NHE) significantly increases eccentric hamstring strength and reduces HSI risk, little research has examined whether between limb asymmetries can be reduced with training...
2018: PeerJ
Andrew N L Buskard, Heath R Gregg, Soyeon Ahn
Guidelines for improving maximal concentric strength through resistance training (RT) have traditionally included large muscle-group exercises, full ranges of motion, and a load approximating 85% of the 1-repetition maximum (1RM). Supramaximal eccentric training (SME; controlled lowering of loads above the concentric 1RM) has also been shown to be effective at increasing concentric 1RM in the lower body, but concerns regarding injury risk, postexercise soreness, and null benefit over traditional methods (TRAD) may limit the practical utility of this approach...
June 11, 2018: Research Quarterly for Exercise and Sport
Giuseppe Coratella, Stefano Longo, Emiliano Cè, Eloisa Limonta, Susanna Rampichini, Angela Valentina Bisconti, Federico Schena, Fabio Esposito
PURPOSE: The present study aimed to investigate whether or not eccentric-only training induced different sex-related adaptations in vastus lateralis muscle architecture and knee extensors strength. METHODS: Thirteen healthy women and 13 healthy men were recruited. Vastus lateralis pennation angle, fascicle length, and muscle thickness, as well as knee extensors eccentric, isometric, and concentric peak torque and one-repetition maximum (1RM) were measured. Both women and men underwent a unilateral iso-load knee-extension eccentric-only training with 120% of the concentric 1RM, consisting of 4 sets × 10 repetitions twice a week for a total of 8 weeks...
June 11, 2018: Research Quarterly for Exercise and Sport
Olivier Maurelli, Pierre L Bernard, Romain Dubois, Said Ahmaidi, Jacques Prioux
Maurelli, O, Bernard, PL, Dubois, R, Ahmaidi, S, and Prioux, J. Effects of the competitive season on the isokinetic muscle parameters changes in world-class handball players. J Strength Cond Res XX(X): 000-000, 2018-The aim of this study is to investigate the effects of the competitive season on isokinetic muscular parameters of the lower limbs in world-class handball players. Nineteen, male, world-class, handball players (age, 26.6 ± 5.4 years) participated in the study. Two bilateral isokinetic tests of knee joint flexors (H; hamstring) and extensors (Q; quadriceps) were performed in the beginning and end of the competitive season to determine the peak torque (PT), the mean power, and agonist-antagonist ratio, dominant-nondominant ratio (DNDR), and combined ratio...
May 25, 2018: Journal of Strength and Conditioning Research
Amador García-Ramos, G Gregory Haff, Pedro Jiménez-Reyes, Alejandro Pérez-Castilla
García-Ramos, A, Haff, GG, Jiménez-Reyes, and P, Pérez-Castilla, A. Assessment of upper-body ballistic performance through the bench press throw exercise: Which velocity outcome provides the highest reliability? J Strength Cond Res XX(X): 000-000, 2018-This study aimed to compare the between-session reliability of 3 velocity variables (mean velocity [MV], mean propulsive velocity [MPV], and maximum velocity [Vmax]) to assess bench press throw (BPT) performance. Twenty-one men were tested during 2 consecutive weeks in 2 variants of the BPT exercise (concentric-only and eccentric-concentric) against 5 different loading conditions (17, 27, 37, 47, and 57 kg)...
May 25, 2018: Journal of Strength and Conditioning Research
Trevor C Chen, Ming-Ju Lin, Jian-Han Lai, Hsin-Lian Chen, Hui-I Yu, Kazunori Nosaka
OBJECTIVES: The magnitude of muscle damage induced by maximal eccentric contractions (MaxEC) of the elbow flexors (EF) is reduced when it is preceded by low-intensity (10% of maximal voluntary isometric contraction strength) eccentric contractions (10%EC) of the same muscle, or by MaxEC of the opposite EF. This study investigated whether 10%EC would reduce the magnitude of muscle damage after MaxEC performed by the opposite arm. DESIGN: Comparison among 6 groups for changes in indirect markers of muscle damage...
December 29, 2017: Journal of Science and Medicine in Sport
Max Aebi, Charlène Maas, Theodor Di Pauli von Treuheim, Hannah Friedrich, Hans-Joachim Wilke
BACKGROUND: A comparative study was performed between a novel transpedicular implant (V-STRUT©, Hyprevention, France) and vertebroplasty. This study aims to assess the biomechanical efficacy of this implant in resurrecting and fortifying the osteoporotic vertebra following a vertebral body fracture. METHODS: A total of 17 vertebrae from 3 human osteoporotic spine segments (T9-L5) were selected. Vertebral compression fractures were generated by eccentric compressive loading until a height reduction of 25%...
May 2, 2018: Clinical Biomechanics
Justin W Andrushko, Layla A Gould, Jonathan P Farthing
The contralateral effects of unilateral strength training, known as cross-education of strength, date back well over a century. In the last decade, a limited number of studies have emerged demonstrating the preservation or "sparing" effects of cross-education during immobilization. Recently published evidence shows that the sparing effects of cross-education show muscle site specificity and involve preservation of muscle cross-sectional area. The new research also demonstrates utility of training with eccentric contractions as a potent stimulus to preserve immobilized limb strength across multiple modes of contraction...
May 25, 2018: Applied Physiology, Nutrition, and Metabolism, Physiologie Appliquée, Nutrition et Métabolisme
Philipp Baumert, Claire E Stewart, Mark J Lake, Barry Drust, Robert M Erskine
We investigated whether single nucleotide polymorphisms (SNPs) within genes encoding the alpha-1 chain of type I (COL1A1, rs2249492; rs1800012), type II (COL2A1, rs2070739) and type V (COL5A1, rs12722) collagen were associated with the variable response to exercise-induced muscle damage (EIMD). Knee extensor muscle strength and soreness were assessed pre-, post-, and 48h post-EIMD (120 maximal eccentric knee extensor contractions) in 65 young healthy participants, who were genotyped for the aforementioned SNPs...
May 25, 2018: Physiological Genomics
Bruno Manfredini Baroni, Cassio Victora Ruas, João Breno Ribeiro-Alvares, Ronei Silveira Pinto
Baroni, BM, Ruas, CV, Ribeiro-Alvares, JB, and Pinto, RS. Hamstring-to-quadriceps torque ratios of professional male soccer players: A systematic review. J Strength Cond Res XX(X): 000-000, 2018-The goal of this review was to determine the isokinetic hamstring-to-quadriceps (H/Q) torque ratios of professional male soccer players. Systematic searches were independently carried out by 2 researchers in 7 electronic databases. Only studies with teams from the first or second national leagues were included. From these studies, we extracted the players' H/Q conventional (concentric/concentric) and/or functional (eccentric/concentric) ratios...
May 23, 2018: Journal of Strength and Conditioning Research
Michael C Lewis, Gregory E Peoples, Herbert Groeller, Marc A Brown
OBJECTIVES: This study determined if eccentric endurance cycling, eliciting a low cardiovascular demand, could stimulate muscle strength adaptations in sedentary middle-aged males. DESIGN: Twenty-four middle-aged sedentary males were allocated to concentric (CON) or matched workload eccentric (ECC) cycling (60% peak concentric workload) according to their maximal voluntary isometric quadriceps strength. METHODS: Seventeen participants [42...
May 15, 2018: Journal of Science and Medicine in Sport
Matthew R Haines
Haines, MR. Differences in glenohumeral joint rotation and peak power output between Super League and Championship Rugby League players. J Strength Cond Res 32(6): 1685-1691, 2018-Rugby league is a high-intensity sport with large impact forces sustained during play, resulting in high prevalence of shoulder injury. Consequently, shoulder strength and player power are important considerations for injury prevention and performance. Additionally, professional teams regularly compete against semiprofessional teams, where differences in physical conditioning could be marked...
June 2018: Journal of Strength and Conditioning Research
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