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Eccentric strength

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https://www.readbyqxmd.com/read/29659539/post-game-high-protein-intake-may-improve-recovery-of-football-specific-performance-during-a-congested-game-fixture-results-from-the-pro-football-study
#1
Athanasios Poulios, Ioannis G Fatouros, Magni Mohr, Dimitrios K Draganidis, Chariklia Deli, Konstantinos Papanikolaou, Apostolos Sovatzidis, Theofano Nakopoulou, Georgios Ermidis, Theofanis Tzatzakis, Vasiliki C Laschou, Kalliopi Georgakouli, Agisilaos Koulouris, Panagiotis Tsimeas, Athanasios Chatzinikolaou, Leonidas G Karagounis, Dimitrios Batsilas, Peter Krustrup, Athanasios Z Jamurtas
The effects of protein supplementation on performance recovery and inflammatory responses during a simulated one-week in-season microcycle with two games (G1, G2) performed three days apart were examined. Twenty football players participated in two trials, receiving either milk protein concentrate (1.15 and 0.26 g/kg on game and training days, respectively) (PRO) or an energy-matched placebo (1.37 and 0.31 g/kg of carbohydrate on game and training days, respectively) (PLA) according to a randomized, repeated-measures, crossover, double-blind design...
April 16, 2018: Nutrients
https://www.readbyqxmd.com/read/29628406/eccentric-training-combined-to-neuromuscular-electrical-stimulation-is-not-superior-to-eccentric-training-alone-for-quadriceps-strengthening-in-healthy-subjects-a-randomized-controlled-trial
#2
Claudia Ferreira Gomes da Silva, Felipe Xavier de Lima E Silva, Karoline Baptista Vianna, Gabriel Dos Santos Oliveira, Marco Aurélio Vaz, Bruno Manfredini Baroni
BACKGROUND: Both eccentric training and neuromuscular electrical stimulation (NMES) are used for quadriceps strengthening. However, the effects of these interventions combined are unclear. OBJECTIVES: To compare the effects of eccentric training combined to NMES and eccentric training alone on structure, strength, and functional performance of knee extensor muscles of healthy subjects. METHODS: This is a three-arm, single-blinded, randomized controlled trial...
March 28, 2018: Brazilian Journal of Physical Therapy
https://www.readbyqxmd.com/read/29625361/quadriceps-concentric-eccentric-force-and-muscle-architecture-in-copd-patients-vs-healthy-men
#3
Giuseppe Coratella, Nicoletta Rinaldo, Federico Schena
The aim of this study was to compare quadriceps concentric and eccentric strength and muscle architecture in chronic obstructive pulmonary disease (COPD) patients vs healthy men. Thirty-five COPD patients (age = 65 ± 4 yrs, forced expiratory volume (FEV1 ) = 63 ± 10%; FEV1 /forced vital capacity (FVC)=57 ± 13% of predicted) and 25 age-matched healthy men (age = 65 ± 4 yrs, FEV1 =114 ± 17%; FEV1 /FVC = 101 ± 6% of predicted) (CON) participated in the present cross-sectional study...
April 3, 2018: Human Movement Science
https://www.readbyqxmd.com/read/29625360/correlation-between-quadriceps-and-hamstrings-inter-limb-strength-asymmetry-with-change-of-direction-and-sprint-in-u21-elite-soccer-players
#4
Giuseppe Coratella, Marco Beato, Federico Schena
The aim of this study was to investigate the relationship between in quadriceps and hamstrings inter-limb strength asymmetry and change of direction, sprinting and jumping abilities in U21 elite soccer players. Twenty-seven soccer players volunteered for this study. Isokinetic quadriceps and hamstrings peak torque was measured at high and low angular velocities, both in concentric and eccentric modalities. Performance in agility T-test, 20 + 20 m shuttle-test, 10 m and 30 m sprint, squat jump (SJ) and counter-movement jump (CMJ), were measured...
April 3, 2018: Human Movement Science
https://www.readbyqxmd.com/read/29621015/hamstring-muscle-injury-prediction-by-isokinetic-ratios-depends-on-the-method-used
#5
Marc Dauty, Pierre Menu, Alban Fouasson-Chailloux
OBJECTIVES: Hamstring muscle injury prediction by isokinetic strength ratios is low but could result from the method-depending either on the use of the limbs or of the sportsmen as references. We aimed to establish a predictive model including unilateral and bilateral ratios calculated from the dominant, nondominant, right, and left limb in injured and uninjured professional soccer players. DESIGN: Cohort study. SETTING: Soccer team of the French Professional Premier League...
April 4, 2018: Clinical Journal of Sport Medicine: Official Journal of the Canadian Academy of Sport Medicine
https://www.readbyqxmd.com/read/29601383/is-platelet-rich-plasma-injection-effective-for-chronic-achilles-tendinopathy-a-meta-analysis
#6
Yi-Jun Zhang, San-Zhong Xu, Peng-Cheng Gu, Jing-Yu Du, You-Zhi Cai, Chi Zhang, Xiang-Jin Lin
BACKGROUND: Chronic Achilles tendinopathy is common in the general population, and platelet-rich plasma (PRP) is seeing increased use to treat this problem. However, studies disagree as to whether PRP confers a beneficial effect for chronic Achilles tendinopathy, and no one to our knowledge has pooled the available randomized trials in a formal meta-analysis to try to reconcile those differences. QUESTIONS/PURPOSES: In the setting of a systematic review and meta-analysis of randomized controlled trials (RCTs), we asked: Does PRP plus eccentric strength training result in (1) greater improvements in Victorian Institute of Sports Assessment-Achilles (VISA-A) scores; (2) differences in tendon thickness; or (3) differences in color Doppler activity compared with placebo (saline) injections plus eccentric strength training in patients with chronic Achilles tendinopathy? METHODS: A search of peer-reviewed articles was conducted to identify all RCTs using PRP injection with eccentric training for chronic Achilles tendinopathy in the electronic databases of PubMed, Web of Science (SCI-E/SSCI/A&HCI), and EMBASE from January 1981 to August 2017...
March 28, 2018: Clinical Orthopaedics and related Research
https://www.readbyqxmd.com/read/29595913/past-injurious-exercise-attenuates-activation-of-primary-calcium-dependent-injury-pathways-in-skeletal-muscle-during-subsequent-exercise
#7
Ryo Takagi, Riki Ogasawara, Junya Takegaki, Yuki Tamura, Arata Tsutaki, Koichi Nakazato, Naokata Ishii
Past contraction-induced skeletal muscle injury reduces the degree of subsequent injury; this phenomenon is called the "repeated bout effect (RBE)." This study addresses the mechanisms underlying the RBE, focusing on primary calcium-dependent injury pathways. Wistar rats were subdivided into single injury (SI) and repeated injury (RI) groups. At age 10 weeks, the right gastrocnemius muscle in each rat in the RI group was subjected to strenuous eccentric contractions (ECs). Subsequently, mild ECs were imposed on the same muscle of each rat at 14 weeks of age in both groups...
March 2018: Physiological Reports
https://www.readbyqxmd.com/read/29594958/change-of-direction-speed-toward-a-strength-training-approach-with-accentuated-eccentric-muscle-actions
#8
Helmi Chaabene, Olaf Prieske, Yassine Negra, Urs Granacher
There is growing evidence that eccentric strength training appears to have benefits over traditional strength training (i.e., strength training with combined concentric and eccentric muscle actions) from muscular, neuromuscular, tendinous, and metabolic perspectives. Eccentric muscle strength is particularly needed to decelerate and stabilize the body during the braking phase of a jump exercise or during rapid changes of direction (CoD) tasks. However, surprisingly little research has been conducted to elucidate the effects of eccentric strength training or strength training with accentuated eccentric muscle actions on CoD speed performance...
March 28, 2018: Sports Medicine
https://www.readbyqxmd.com/read/29585730/musculoskeletal-screening-tests-and-bony-hip-morphology-cannot-identify-male-professional-soccer-players-at-risk-of-groin-injuries-a-2-year-prospective-cohort-study
#9
Andrea B Mosler, Adam Weir, Andreas Serner, Rintje Agricola, Cristiano Eirale, Abdulaziz Farooq, Arnhild Bakken, Kristian Thorborg, Rod J Whiteley, Per Hölmich, Roald Bahr, Kay M Crossley
BACKGROUND: Musculoskeletal hip/groin screening tests are commonly performed to detect at-risk individuals. Bony hip morphology is considered a potential intrinsic risk factor but has not been examined prospectively. PURPOSE: To evaluate the association between intrinsic risk factors identified from musculoskeletal and radiographic screening tests and hip/groin injuries leading to time loss from training and/or match play in professional male soccer players. STUDY DESIGN: Prospective cohort study; Level of evidence, 2...
March 1, 2018: American Journal of Sports Medicine
https://www.readbyqxmd.com/read/29576313/training-induced-changes-in-quadriceps-activation-during-maximal-eccentric-contractions
#10
Dimitrios Voukelatos, Mathew Kirkland, Matthew T G Pain
Despite full voluntary effort, neuromuscular activation of the quadriceps group of muscles appears inhibited during eccentric contractions. A nerve stimulation protocol during dynamic contractions of the quadriceps was developed that employed triplets of supramaximal pulses to assess suppressed eccentric activation. Subsequently the effects of a short training intervention, performed on a dynamometer, on eccentric strength output and neural inhibition were examined. Torque-angular velocity (T-ω) and experimental voluntary neural drive-angular velocity (%VA-ω; %VA, obtained via the interpolated twitch technique) datasets, were obtained from pre- and post-training testing sessions...
March 17, 2018: Journal of Biomechanics
https://www.readbyqxmd.com/read/29572976/the-effect-of-nordic-hamstring-exercise-training-volume-on-biceps-femoris-long-head-architectural-adaptation
#11
Joel D Presland, Ryan G Timmins, Matthew N Bourne, Morgan D Williams, David A Opar
PURPOSE: To determine the time course of architectural adaptations in the biceps femoris long head (BFLH ) following high or low volume eccentric training. METHODS: Twenty recreationally active males completed a two week standardised period of eccentric Nordic hamstring exercise (NHE) training, followed by four weeks of high (n=10) or low volume (n=10) training. Eccentric strength was assessed pre and post intervention and following detraining. Architecture was assessed weekly during training and after two and four weeks of detraining...
March 23, 2018: Scandinavian Journal of Medicine & Science in Sports
https://www.readbyqxmd.com/read/29570722/thoracic-dysfunction-in-whiplash-associated-disorders-a-systematic-review
#12
Nicola R Heneghan, Richard Smith, Isaak Tyros, Deborah Falla, Alison Rushton
BACKGROUND: Research investigating Whiplash Associated Disorder (WAD) has largely focused on the cervical spine yet symptoms can be widespread. Thoracic spine pain prevalence is reported ~66%; perhaps unsurprising given the forceful stretch/eccentric loading of posterior structures of the spine, and the thoracic spine's contribution to neck mobility/function. Approximately 50% WAD patients develop chronic pain and disability resulting in high levels of societal and healthcare costs. It is time to look beyond the cervical spine to fully understand anatomical dysfunction in WAD and provide new directions for clinical practice and research...
2018: PloS One
https://www.readbyqxmd.com/read/29570534/neuromuscular-adaptations-to-work-matched-maximal-eccentric-vs-concentric-training
#13
Sumiaki Maeo, Xiyao Shan, Shun Otsuka, Hiroaki Kanehisa, Yasuo Kawakami
It is unclear whether the superiority of eccentric over concentric training on neuromuscular improvements is due to higher torque (mechanical loading) achievable during eccentric contractions or due to resulting greater total work. PURPOSE: To examine neuromuscular adaptations following maximal eccentric versus concentric training matched for total work. METHODS: Twelve males conducted single-joint isokinetic (180°/s) maximal eccentric contractions of the knee extensors in one leg (ECC-leg) and concentric in the other (CON-leg), 6 sets/session (3-5 sets in the initial 1-3 sessions), 2 sessions/week for 10 weeks...
March 22, 2018: Medicine and Science in Sports and Exercise
https://www.readbyqxmd.com/read/29541126/the-reliability-and-validity-of-a-video-based-method-for-assessing-hamstring-strength-in-football-players
#14
Justin W Y Lee, Cheng Li, Patrick S H Yung, Kai-Ming Chan
Background/Objective: Evaluating hamstring strength by isokinetic dynamometry is limited by various practical issues such as time and cost. A video-based Nordic hamstring exercise is introduced as an alternative option. The aims of this study are to evaluate 1.) the between-session reliability and 2.) concurrent validity of the testing method compared to a standardized isokinetic dynamometry. Methods: Thirty male elite footballers were recruited for the study. From the Nordic hamstring exercise, the video-analysis-determined Nordic break-point angles where the participant could no longer withstand the force of the fall (eccentric mode) and the number of seconds that the player could hold at 30° forward flexion angle (isometric mode) were measured...
June 2017: Journal of Exercise Science and Fitness
https://www.readbyqxmd.com/read/29533672/muscle-strength-is-a-poor-screening-test-for-predicting-lower-extremity-injuries-in-professional-male-soccer-players-a-2-year-prospective-cohort-study
#15
Arnhild Bakken, Stephen Targett, Tone Bere, Cristiano Eirale, Abdulaziz Farooq, Andrea B Mosler, Johannes L Tol, Rod Whiteley, Karim M Khan, Roald Bahr
BACKGROUND: Lower extremity muscle strength tests are commonly used to screen for injury risk in professional soccer. However, there is limited evidence on the ability of such tests in predicting future injuries. PURPOSE: To examine the association between hip and thigh muscle strength and the risk of lower extremity injuries in professional male soccer players. STUDY DESIGN: Case-control study; Level of evidence, 3. METHODS: Professional male soccer players from 14 teams in Qatar underwent a comprehensive strength assessment at the beginning of the 2013/2014 and 2014/2015 seasons...
March 1, 2018: American Journal of Sports Medicine
https://www.readbyqxmd.com/read/29507824/similar-acute-physiological-responses-from-effort-and-duration-matched-leg-press-and-recumbent-cycling-tasks
#16
James Steele, Andrew Butler, Zoe Comerford, Jason Dyer, Nathan Lloyd, Joshua Ward, James Fisher, Paulo Gentil, Christopher Scott, Hayao Ozaki
The present study examined the effects of exercise utilising traditional resistance training (leg press) or 'cardio' exercise (recumbent cycle ergometry) modalities upon acute physiological responses. Nine healthy males underwent a within session randomised crossover design where they completed both the leg press and recumbent cycle ergometer conditions. Conditions were approximately matched for effort and duration (leg press: 4 × 12RM using a 2 s concentric and 3 s eccentric repetition duration controlled with a metronome, thus each set lasted  60 s; recumbent cycle ergometer: 4 × 60 s bouts using a resistance level permitting 80-100 rpm but culminating with being unable to sustain the minimum cadence for the final 5-10 s)...
2018: PeerJ
https://www.readbyqxmd.com/read/29503012/eccentric-knee-flexor-strength-profiles-of-341-elite-male-academy-and-senior-gaelic-football-players-do-body-mass-and-previous-hamstring-injury-impact-performance
#17
Mark Roe, Shane Malone, Eamonn Delahunt, Kieran Collins, Conor Gissane, Ulrik McCarthy Persson, John C Murphy, Catherine Blake
OBJECTIVE: Report eccentric knee flexor strength values of elite Gaelic football players from underage to adult level whilst examining the influence of body mass and previous hamstring injury. DESIGN: Cross-sectional study. SETTING: Team's training facility. PARTICIPANTS: Elite Gaelic football players (n = 341) from under 14 years to senior age-grades were recruited from twelve teams. MAIN OUTCOME MEASURES: Absolute (N) and relative (N·kg-1 ) eccentric hamstring strength as well as corresponding between-limb imbalances (%) were calculated for all players...
March 1, 2018: Physical Therapy in Sport
https://www.readbyqxmd.com/read/29485344/kinetic-and-electromyographic-sub-phase-characteristics-with-relation-to-countermovement-vertical-jump-performance
#18
John R Harry, Max R Paquette, Brian K Schilling, Leland A Barker, C Roger James, Janet S Dufek
This study sought to identify kinetic and electromyographic (EMG) sub-phase characteristics distinguishing good from poor jumpers during countermovement vertical jumps (CMVJ), as defined by the reactive strength index (CMVJ displacement divided by jump time; RSI; cutoff=.46 m/s). Fifteen men (1.8±.6 m; 84.5±8.5 kg; 24±2 y) were stratified by RSI into good (n=6; RSI=.57±.07 m/s) and poor (n=9; RSI=.39±.06 m/s) performance groups. The following variables were compared between groups using independent t-tests (α=...
February 27, 2018: Journal of Applied Biomechanics
https://www.readbyqxmd.com/read/29484246/isokinetic-assessment-of-muscular-strength-and-balance-in-brazilian-elite-futsal-players
#19
Renan F H Nunes, Rodolfo A Dellagrana, Fábio Y Nakamura, Cosme F Buzzachera, Flavia A M Almeida, Lucinar J F Flores, Luiz G A Guglielmo, Sérgio G da Silva
Purpose/Background: Strength asymmetries are related to knee injuries in intermittent sports players. The purpose of this study was to examine whether elite futsal players demonstrate strength asymmetries during knee isokinetic testing applying the Croisier et al.21 criteria. Methods: Forty male elite (27.9 ± 6.5 years) Brazilian futsal players participated in the study. The testing protocol required players to perform concentric contractions of both quadriceps and hamstring muscles at angular velocities of 60 °·s-1 and 240 °·s-1 and eccentric contractions of hamstring at 30 °·s-1 and 120 °·s-1 ...
February 2018: International Journal of Sports Physical Therapy
https://www.readbyqxmd.com/read/29470362/an-evaluation-of-supramaximally-loaded-eccentric-leg-press-exercise
#20
Mellissa Harden, Alex Wolf, Mark Russell, Kirsty M Hicks, Duncan French, Glyn Howatson
High intensity eccentric exercise is a potent stimulus for neuromuscular adaptation. A greater understanding of the mechanical stimuli afforded by this exercise will aid the prescription of future eccentric training regimes. This study sought to investigate the mechanical characteristics of supramaximally loaded eccentric exercise when using a custom-built leg press machine. Using a within subject, repeated measures design, 15 strength trained subjects (age 31 ± 7 years; height 180.0 ± 6.8 cm; body mass 81...
February 20, 2018: Journal of Strength and Conditioning Research
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