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Eccentric exercise

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https://www.readbyqxmd.com/read/29351163/comparison-of-the-force-velocity-and-power-time-curves-between-the-concentric-only-and-eccentric-concentric-bench-press-exercises
#1
Alejandro Pérez-Castilla, Paul Comfort, John J McMahon, Francisco Luis Pestaña-Melero, Amador García-Ramos
The aim of this study was to compare the temporal and mechanical variables between the concentric-only and eccentric-concentric bench press (BP) variants. Twenty-one men (age: 22.0±4.2 years, body mass: 73.4±7.7 kg, height: 177.2±8.0 cm; one-repetition maximum [1RM]: 1.12±0.12 kg⋅kg) were evaluated during the concentric-only and eccentric-concentric BP variants using 80% 1RM. Temporal (concentric phase duration, propulsive phase duration, and time to reach the maximum values of force, velocity, and power) and mechanical variables (force, velocity, and power), determined using a linear velocity transducer, were compared between both BP variants...
January 17, 2018: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/29339993/functional-and-muscle-size-effects-of-flywheel-resistance-training-with-eccentric-overload-in-professional-handball-players
#2
Sergio Maroto-Izquierdo, David García-López, José A de Paz
The aim of the study was to analyse the effects of 6 week (15 sessions) flywheel resistance training with eccentric-overload (FRTEO) on different functional and anatomical variables in professional handball players. Twenty-nine athletes were recruited and randomly divided into two groups. The experimental group (EXP, n = 15) carried out 15 sessions of FRTEO in the leg-press exercise, with 4 sets of 7 repetitions at a maximum-concentric effort. The control group (CON, n = 14) performed the same number of training sessions including 4 sets of 7 maximum repetitions (7RM) using a weight-stack leg-press machine...
December 2017: Journal of Human Kinetics
https://www.readbyqxmd.com/read/29339983/analysis-of-the-hamstring-muscle-activation-during-two-injury-prevention-exercises
#3
Alireza Monajati, Eneko Larumbe-Zabala, Mark Goss-Sampson, Fernando Naclerio
The aim of this study was to perform an electromyographic and kinetic comparison of two commonly used hamstring eccentric strengthening exercises: Nordic Curl and Ball Leg Curl. After determining the maximum isometric voluntary contraction of the knee flexors, ten female athletes performed 3 repetitions of both the Nordic Curl and Ball Leg Curl, while knee angular displacement and electromyografic activity of the biceps femoris and semitendinosus were monitored. No significant differences were found between biceps femoris and semitendinosus activation in both the Nordic Curl and Ball Leg Curl...
December 2017: Journal of Human Kinetics
https://www.readbyqxmd.com/read/29329890/pain-motion-and-function-comparison-of-two-exercise-protocols-for-the-rotator-cuff-and-scapular-stabilizers-in-patients-with-subacromial-syndrome
#4
Eva Vallés-Carrascosa, Tomás Gallego-Izquierdo, José Jesús Jiménez-Rejano, Gustavo Plaza-Manzano, Daniel Pecos-Martín, Fidel Hita-Contreras, Alexander Achalandabaso Ochoa
STUDY DESIGN: Randomized clinical trial. INTRODUCTION: Eccentric exercise (EE) was shown to be an effective treatment in tendinopathies. However, the evidence of its effectiveness in subacromial syndrome (SS) is scarce. Moreover, consensus has not been reached on whether best results for SS are obtained by means of EE with or without pain. PURPOSE OF THE STUDY: The purpose of this is to compare the effect on pain, active range of motion (AROM), and shoulder function of an exercise protocol performed with pain <40 mm Visual Analog Scale (VAS) and without pain, in patients with SS...
January 9, 2018: Journal of Hand Therapy: Official Journal of the American Society of Hand Therapists
https://www.readbyqxmd.com/read/29315567/the-influence-of-capillarization-on-satellite-cell-pool-expansion-and-activation-following-exercise-induced-muscle-damage-in-healthy-young-men
#5
Joshua P Nederveen, Sophie Joanisse, Tim Snijders, Aaron Cq Thomas, Dinesh Kumbhare, Gianni Parise
Factors that determine the skeletal muscle satellite cell (SC) response remain incompletely understood. It is known, however, that SC activation status is closely related to the anatomical relationship between SC and muscle capillaries. We investigated the impact of muscle fibre capillarization on the expansion and activation status of SC following a muscle damaging exercise protocol in healthy young men. Twenty-nine young men (21 ± 0.5 yrs) performed 300 unilateral eccentric contractions (180 deg·s-1 ) of the knee extensors...
January 6, 2018: Journal of Physiology
https://www.readbyqxmd.com/read/29287792/platycodon-grandiflorum-derived-saponin-attenuates-the-eccentric-exercise-induced-muscle-damage
#6
Yong-An Kim, Suck-Hoon Oh, Gi-Ho Lee, Pham Thi Hoa, Sun Woo Jin, Young Chul Chung, Young Chun Lee, Hye-Gwang Jeong
Platycodon grandiflorum contains triterpenoid saponins, such as platycodin D and platyconic acid A, and acts as a multifold nutritious compound. Our previous research demonstrated that Platycodon grandiflorum-derived saponin (PS) improves high-fat diet-induced non-alcoholic steatohepatitis and inhibits osteoclast differentiation. The pivotal effects of PS on inflammatory mechanism were suppressed NF-κB and matrix metalloproteinase (MMPs). However, the effects of PS on skeletal muscle damage remain unknown...
December 26, 2017: Food and Chemical Toxicology
https://www.readbyqxmd.com/read/29283704/reliability-validity-and-sensitivity-of-a-novel-smartphone-based-eccentric-hamstring-strength-test-in-professional-football-players
#7
Justin W Y Lee, Ming-Jing Cai, Patrick S H Yung, Kai-Ming Chan
PURPOSE: This study aims to evaluate the test-retest reliability, sensitivity and concurrent validity of a smartphone-based method for assessing eccentric hamstring strength among male professional football players. METHODS: Twenty-five healthy male professional football players have performed CUHK Nordic break-point test, hamstring fatigue protocol and isokinetic hamstring strength test. CUHK Nordic break-point test is based on a Nordic hamstring exercise. The Nordic break-point angle was defined as the maximum point where the participants could no longer support the weight of their body against gravity...
December 28, 2017: International Journal of Sports Physiology and Performance
https://www.readbyqxmd.com/read/29278576/electrical-stimulation-of-the-antagonist-muscle-during-cycling-exercise-interval-training-improves-oxygen-uptake-and-muscle-strength
#8
Ryuki Hashida, Yoshio Takano, Hiroo Matsuse, Mei Kudo, Masafumi Bekki, Masayuki Omoto, Takeshi Nago, Takumi Kawaguchi, Takuji Torimura, Naoto Shiba
A hybrid training system (HTS) is a resistance exercise method that combines voluntary concentric muscle contractions and electrically stimulated eccentric muscle contractions. We devised an exercise technique using HTS on cycle ergometer (HCE). The purpose of this study was to compare cardiorespiratory function and muscle strength when cycling exercise is combined with electrical stimulation over an extended period.Twenty-nine healthy young men were divided into an HCE group (n=14) and a VCE group (volitional cycle ergometer alone) (n=15)...
December 20, 2017: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/29276542/different-training-responses-to-eccentric-endurance-exercise-at-low-and-moderate-altitudes-in-pre-diabetic-men-a-pilot-study
#9
Kultida Klarod, Marc Philippe, Hannes Gatterer, Martin Burtscher
This pilot study aimed (a) to evaluate the effects of eccentric exercise training at low and moderate altitudes on physical fitness in pre-diabetic men and (b) to establish whether or not oxidative stress levels and antioxidant status were associated with performance improvements. In this crossover trial, five pre-diabetic men conducted nine downhill walking sessions (3 days/week, 3 consecutive weeks) at low altitude (from 1360 to 850 m) and one year later at moderate altitude (from 2447 to 2000 m). Exercise testing and the determination of parameters of oxidative stress and antioxidant capacity were performed pre- and post-training...
2017: Sport Sciences for Health
https://www.readbyqxmd.com/read/29274169/muscle-damage-protective-effect-by-two-maximal-isometric-contractions-on-maximal-eccentric-exercise-of-the-elbow-flexors-of-the-contralateral-arm
#10
Trevor C Chen, Ming-Ju Lin, Hsin-Lian Chen, Jian-Han Lai, Hui-I Yu, Kazunori Nosaka
Muscle damage after 30 maximal eccentric contractions of the elbow flexors (30MVEC) is reduced when the same exercise is performed by the opposite arm, and when two maximal voluntary isometric contractions at a long muscle length (2MVIC) are performed prior to 30MVEC by the same arm. This study investigated the hypothesis that 2MVIC would attenuate muscle damage after 30MVEC performed by the opposite arm. Untrained young (20-25 y) men were placed into one of four experimental groups that performed 2MVIC at 1 (1d), 2 (2d), 4 (4d) or 7 days (7d) before 30 MVEC by the opposite arm, or one control group that performed 30MVEC only (n=13/group)...
December 23, 2017: Scandinavian Journal of Medicine & Science in Sports
https://www.readbyqxmd.com/read/29260619/mental-fatigue-alters-the-speed-and-the-accuracy-of-the-ball-in-table-tennis
#11
Yann Le Mansec, Benjamin Pageaux, Antoine Nordez, Sylvain Dorel, Marc Jubeau
This study aimed at evaluating the effects of mental and muscle fatigue on table tennis performance. Mental fatigue (MF) was induced by completion of 90 minutes of the AX-CPT; muscle fatigue was induced by completion of an eccentric exercise performed with the elbow flexors (biceps fatigue, BF) or the knee extensors (quadriceps fatigue, QF). The control condition consisted of watching a movie. Stroke parameters (speed and accuracy of the ball), as well as feelings of fatigue and force production capacity of the elbow flexors (BF, MF and control conditions) and knee extensors (QF condition), were assessed pre and post fatigue protocols...
December 20, 2017: Journal of Sports Sciences
https://www.readbyqxmd.com/read/29250715/long-term-regular-eccentric-exercise-decreases-neuropathic-pain-like-behavior-and-improves-motor-functional-recovery-in-an-axonotmesis-mouse-model-the-role-of-insulin-like-growth-factor-1
#12
Daniel F Martins, Thiago C Martins, Ana Paula Batisti, Larissa Dos Santos Leonel, Franciane Bobinski, Luiz A O Belmonte, Leidiane Mazzardo-Martins, Eduardo Cargnin-Ferreira, Adair R S Santos
Although training programs with regular eccentric (ECC) exercise are more commonly used for improving muscular strength and mobility, ECC exercise effects upon functional recovery of the sciatic nerve has not yet been determined. After sciatic nerve crush, different mice groups were subjected to run on the treadmill for 30 min at a speed of 6, 10, or 14 m/min with - 16° slope, 5 days per week, over 8 weeks. During the training time, neuropathic pain-like behavior (mechanical and cold hyperalgesia) was assessed and functional recovery was determined with the grip strength test and the Sciatic Functional and Static indexes (SFI and SSI)...
December 18, 2017: Molecular Neurobiology
https://www.readbyqxmd.com/read/29247985/slow-movement-resistance-training-using-body-weight-improves-muscle-mass-in-the-elderly-a-randomized-controlled-trial
#13
S Tsuzuku, T Kajioka, H Sakakibara, K Shimaoka
To examine the effect of a 12-week slow movement resistance training using body weight as a load (SRT-BW) on muscle mass, strength, and fat distribution in healthy elderly people. Fifty-three men and 35 women aged 70 years old or older without experience in resistance training participated, and they were randomly assigned to a SRT-BW group or control group. The control group did not receive any intervention, but participants in this group underwent a repeat measurement 12 weeks later. The SRT-BW program consisted of three different exercises (squat, tabletop push-up, and sit-up), which were designed to stimulate anterior major muscles...
December 16, 2017: Scandinavian Journal of Medicine & Science in Sports
https://www.readbyqxmd.com/read/29239779/gender-differences-in-residual-effect-of-prior-drop-jumps-on-oxygen-uptake-during-heavy-cycling-exercise
#14
Neringa Baranauskienė, Sandra Kilikevičienė, Loreta Stasiulė, Genuvaitė Civinskienė, Arvydas Stasiulis
BACKGROUND AND OBJECTIVE: Unaccustomed eccentric or eccentric-concentric exercise leaves us stiff and sore the next day and can cause muscle damage. The data about the residual effect of prior eccentric-concentric exercises on oxygen uptake (VO2) during constant cycling exercise in women or the data about differences of such effect between genders are scarce. Therefore, the aim of this study was to assess differences of the residual effect of PDJ on VO2 during HCE and indirect muscle damage parameters between women and men...
November 1, 2017: Medicina
https://www.readbyqxmd.com/read/29238948/antioxidants-for-preventing-and-reducing-muscle-soreness-after-exercise
#15
REVIEW
Mayur K Ranchordas, David Rogerson, Hora Soltani, Joseph T Costello
BACKGROUND: Muscle soreness typically occurs after intense exercise, unaccustomed exercise or actions that involve eccentric contractions where the muscle lengthens while under tension. It peaks between 24 and 72 hours after the initial bout of exercise. Many people take antioxidant supplements or antioxidant-enriched foods before and after exercise in the belief that these will prevent or reduce muscle soreness after exercise. OBJECTIVES: To assess the effects (benefits and harms) of antioxidant supplements and antioxidant-enriched foods for preventing and reducing the severity and duration of delayed onset muscle soreness following exercise...
December 14, 2017: Cochrane Database of Systematic Reviews
https://www.readbyqxmd.com/read/29234566/the-rehabilitation-of-a-runner-with-iliopsoas-tendinopathy-using-an-eccentric-biased-exercise-a-case-report
#16
Carla Rauseo
Background and Purpose: While there is much discussion about tendinopathy in the literature, there is little reference to the less common condition of iliopsoas tendinopathy, and no documentation of the condition in runners. The iliopsoas is a major decelerator of the hip and eccentric loading of the iliopsoas is an important component of energy transfer during running. Eccentric training is a thoroughly researched method of treating tendinopathy but has shown mixed results. The purpose of this case report is to describe the rehabilitation of a runner with iliopsoas tendinopathy, and demonstrate in a creative eccentric-biased technique to assist with treatment...
December 2017: International Journal of Sports Physical Therapy
https://www.readbyqxmd.com/read/29234564/shoulder-external-rotator-eccentric-training-versus-general-shoulder-exercise-for-subacromial-pain-syndrome-a-randomized-controlled-trial
#17
Eric J Chaconas, Morey J Kolber, William J Hanney, Matthew L Daugherty, Stanley H Wilson, Charles Sheets
Background: Shoulder pain affects up to 67% of the population at some point in their lifetime with subacromial pain syndrome (SAPS) representing a common etiology. Despite a plethora of studies there remains conflicting evidence for appropriate management of SAPS. Purpose: To compare outcomes, for individuals diagnosed with SAPS, performing a 6-week protocol of eccentric training of the shoulder external rotators (ETER) compared to a general exercise (GE) protocol...
December 2017: International Journal of Sports Physical Therapy
https://www.readbyqxmd.com/read/29234561/comparison-of-functional-activities-on-structural-changes-of-the-inferior-patellar-pole
#18
Kelli McKinney, Harvey Wallmann, Patrick Stalcup, Katie DiTommaso
Background: It is well known that eccentric and concentric exercise produce varied amounts of stress on the connective tissues. Diagnostic ultrasound has been used to measure these structural changes by observing fascicle length, angle, and thickness; however, there is a lack of evidence comparing the structural changes as it relates to eccentric, concentric, and stretching protocols. Purpose: The purpose of this study was to compare the acute effects of static stretching, eccentric, concentric, and a combination of eccentric/concentric exercises on structural changes of the muscle tendon unit at the inferior patellar pole utilizing the diagnostic ultrasound...
December 2017: International Journal of Sports Physical Therapy
https://www.readbyqxmd.com/read/29220207/mr-imaging-of-muscle-trauma-anatomy-biomechanics-pathophysiology-and-imaging-appearance
#19
Dyan V Flores, Catalina Mejía Gómez, Mauricio Estrada-Castrillón, Edward Smitaman, Mini N Pathria
Muscle is an important component of the muscle-tendon-bone unit, driving skeletal motion through contractions that alter the length of the muscle. The muscle and myotendinous junction (MTJ) are most commonly injured in the young adult, as a result of indirect mechanisms such as overuse or stretching, direct impact (penetrating or nonpenetrating), or dysfunction of the supporting connective tissues. Magnetic resonance (MR) imaging is widely used for assessment of muscle injuries. This review illustrates the MR imaging appearance of a broad spectrum of acute, subacute, and chronic traumatic lesions of muscle, highlighting the pathophysiology, biomechanics, and anatomic considerations underlying these lesions...
December 8, 2017: Radiographics: a Review Publication of the Radiological Society of North America, Inc
https://www.readbyqxmd.com/read/29216288/adaptations-in-antagonist-co-activation-role-in-the-repeated-bout-effect
#20
Robert E Hight, Travis W Beck, Debra A Bemben, Christopher D Black
Eccentric exercise results in an adaptation which attenuates muscle damage from subsequent exercise-termed the "repeated-bout effect (RBE)." PURPOSE: Study examined antagonist co-activation and motor-unit recruitment strategy, assessed via dEMG, concomitant to the RBE. METHODS: Nine participants performed 5 sub-maximal isometric trapezoid (ramp-up, hold, ramp-down) contractions at force levels corresponding to 50% and 80% of maximal isometric strength (MVC). Surface EMG signals of the biceps brachii were decomposed into individual motor-unit action potential trains...
2017: PloS One
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