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https://www.readbyqxmd.com/read/29420390/specific-adaptations-in-performance-and-muscle-architecture-after-weighted-jump-squat-vs-body-mass-squat-jump-training-in-recreational-soccer-players
#1
Giuseppe Coratella, Marco Beato, Chiara Milanese, Stefano Longo, Eloisa Limonta, Susanna Rampichini, Emiliano Cè, Angela Valentina Bisconti, F Schena, F Esposito
The aim of the present study was to compare the effects of weighted jump squat (WJST) vs body mass squat jump training (BMSJT) on quadriceps muscle architecture, lower-limb lean-mass (LM) and muscle strength, performance in change of direction (COD), sprint and jump in recreational soccer-players. Forty-eight healthy soccer-players participated in an off-season randomized controlled-trial. Before and after an eight-week training intervention, vastus lateralis pennation angle, fascicle length, muscle thickness, LM, squat 1-RM, quadriceps and hamstrings isokinetic peak-torque, agility T-test, 10 and 30m sprint and squat-jump (SJ) were measured...
February 6, 2018: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/29420095/flexibility-and-strength-training-in-asthma-a-pilot-study
#2
Sara Olenich, Graeme Waterworth, Gary J Badger, Bruce Levy, Elliot Israel, Helene M Langevin
OBJECTIVE: Although less is known about musculoskeletal factors that may contribute to asthma symptoms, body-based treatments addressing movement restrictions of the chest and shoulders may be a useful adjunct to asthma pharmacotherapy. In this pilot study, we compared asthma symptoms, pulmonary function tests, and medication use before and after a course of resistance flexibility and strength training (RFST) treatments in human subjects with asthma. METHODS: Patients with asthma (n = 10; mean age 23 years) completed questionnaires (Asthma Control Questionnaire (ACQ), Asthma Quality of Life Questionnaire (AQLQ), Asthma Control Test (ACT)), spirometry, chest wall excursion, and shoulder range of motion (ROM) before and after a series of four RFST treatments over 47 ± 21 days...
February 8, 2018: Journal of Asthma: Official Journal of the Association for the Care of Asthma
https://www.readbyqxmd.com/read/29407858/biomechanical-and-physiological-age-differences-in-a-simulated-forward-fall-on-outstretched-hands-in-women
#3
Lauren J Lattimer, Joel L Lanovaz, Jonathan P Farthing, Stéphanie Madill, Soo Y Kim, Stephen Robinovitch, Catherine M Arnold
BACKGROUND: Falling on the outstretched hands, a protective mechanism to arrest the body and avoid injury, requires upper limb and trunk motor control for effective body descent. Older women are particularly susceptible to injury from a forward fall, but the biomechanical and physiological (e.g., muscle strength) factors related to this increased risk are poorly understood. Determining age differences in the modifiable neuromuscular factors related to a forward fall landing and descent could help to inform injury prevention strategies...
January 27, 2018: Clinical Biomechanics
https://www.readbyqxmd.com/read/29401195/effects-of-foam-rolling-on-range-of-motion-peak-torque-muscle-activation-and-the-hamstrings-to-quadriceps-strength-ratios
#4
Samantha N Madoni, Pablo B Costa, Jared W Coburn, Andrew J Galpin
PURPOSE: To examine the effects of foam rolling (FR), on range of motion, (ROM), peak torque (PT), hamstrings-to-quadriceps (H:Q) ratios, and muscle activation . METHODS: Twenty-two recreationally active women (mean age ± SD = 21.55 ± 1.82 years, 161.91 ± 6.58 cm, 61.47 ± 10.54 kg) volunteered for this study. Participants performed pre- and post-tests analyzing PT and surface electromyography (EMG) of their dominant limb completing maximal knee extension and flexion at three different velocities...
February 1, 2018: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/29390001/acute-effects-of-different-dynamic-exercises-on-hamstring-strain-risk-factors
#5
Che Hsiu Chen, Ye Xin, Kuang Wu Lee, Ming Ju Lin, Jiu Jenq Lin
The purpose of the study was to examine the acute effects of different dynamic exercise interventions on hamstring muscle performance. Thirty-six young men with poor hamstring flexibility were randomly assigned to three intervention groups: jogging combined with dynamic open kinetic chain stretching (DS), jogging combined with dynamic closed kinetic chain stretching (lunge with eccentric hamstring windmills, LEC), and jogging only (CON) groups. Hamstring flexibility, muscle stiffness (area under the curve, AUC), joint position sense (JPS), maximal eccentric strength (ECC), and angle of peak torque (APT) were recorded before and immediately after the exercise interventions...
2018: PloS One
https://www.readbyqxmd.com/read/29389836/strength-training-effects-on-muscular-regeneration-after-acl-reconstruction
#6
Birgit Friedmann-Bette, Francesca Profit, Thomas Gwechenberger, Nadine Weiberg, Mario Parstorfer, Marc-Andre Weber, Nikolaus Streich, Alexander Barié
PURPOSE: Protracted quadriceps muscle atrophy is observed after anterior cruciate ligament reconstruction (ACL-R). The aim of this study was to assess if quadriceps strength training with eccentric overload (CON/ECC) is more efficient to induce muscle regeneration after ACL-R than conventional concentric/eccentric (CON/ECC) strength training. METHODS: Biopsies from the vastus lateralis muscle were obtained from 37 recreational athletes after 12 weeks of regular rehabilitation following ACL-R and again after 12 weeks with twice a week either conventional CON/ECC (n = 16) or CON/ECC (n = 21) one-legged supervised leg-press training...
January 31, 2018: Medicine and Science in Sports and Exercise
https://www.readbyqxmd.com/read/29372481/the-importance-of-muscular-strength-training-considerations
#7
REVIEW
Timothy J Suchomel, Sophia Nimphius, Christopher R Bellon, Michael H Stone
This review covers underlying physiological characteristics and training considerations that may affect muscular strength including improving maximal force expression and time-limited force expression. Strength is underpinned by a combination of morphological and neural factors including muscle cross-sectional area and architecture, musculotendinous stiffness, motor unit recruitment, rate coding, motor unit synchronization, and neuromuscular inhibition. Although single- and multi-targeted block periodization models may produce the greatest strength-power benefits, concepts within each model must be considered within the limitations of the sport, athletes, and schedules...
January 25, 2018: Sports Medicine
https://www.readbyqxmd.com/read/29369951/performance-differences-among-skilled-soccer-players-of-different-playing-positions-during-vertical-jumping-and-landing
#8
John R Harry, Leland A Barker, Roger James, Janet S Dufek
Harry, JR, Barker, LA, James, CR, and Dufek, JS. Performance differences among skilled soccer players of different playing positions during vertical jumping and landing. J Strength Cond Res 32(2): 304-312, 2018-Both jumping and landing performance of skilled soccer players is diminished when task demands are increased. However, it is unclear if performance changes are specific to players of certain playing positions. Therefore, we assessed jumping and landing performance among skilled soccer players of different playing positions...
February 2018: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/29366541/a-service-evaluation-and-improvement-project-a-three-year-systematic-audit-cycle-of-the-physiotherapy-treatment-for-lateral-epicondylalgia
#9
Paul A Barratt, James Selfe
OBJECTIVES: To improve outcomes of physiotherapy treatment for patients with Lateral Epicondylalgia. DESIGN: A systematic audit and quality improvement project over three phases, each of one year duration. SETTING: Salford Royal NHS Foundation Trust Teaching Hospital Musculoskeletal Physiotherapy out-patients department. PARTICIPANTS: n=182. INTERVENTIONS: Phase one - individual discretion; Phase two - strengthening as a core treatment however individual discretion regarding prescription and implementation; Phase three - standardised protocol using high load isometric exercise, progressing on to slow combined concentric & eccentric strengthening...
September 22, 2017: Physiotherapy
https://www.readbyqxmd.com/read/29360000/ambulation-and-physical-function-after-eccentric-resistance-training-in-adults-with-incomplete-spinal-cord-injury-a-feasibility-study
#10
Whitley J Stone, Sandra L Stevens, Dana K Fuller, Jennifer L Caputo
BACKGROUND: Strengthening the lower extremities has shown to positively influence walking mechanics in those with neurological deficiencies. Eccentric resistance training (ERT) is a potent stimulus for the development of muscular strength with low metabolic demand. Thereby, ERT may benefit those with incomplete spinal cord injuries (iSCI) seeking to improve ambulatory capacity. DESIGN: This study was aimed to determine the effect of ERT on walking speed, mobility, independence, and at home function following iSCI...
January 23, 2018: Journal of Spinal Cord Medicine
https://www.readbyqxmd.com/read/29357520/unilateral-strength-training-leads-to-muscle-specific-sparing-effects-during-opposite-homologous-limb-immobilization
#11
Justin W Andrushko, Joel L Lanovaz, Kelsey M Björkman, Saija A Kontulainen, Jonathan Peter Farthing
Cross-education (CE) occurs after unilateral training whereby performance of the untrained contralateral limb is enhanced. A handful of studies have shown that CE can spare the strength and size of an opposite immobilized limb, but specificity (i.e., trained homologous muscle and contraction type) of these effects is unknown. The purpose was to investigate specificity of CE "sparing" effects with immobilization. The non-dominant forearm of 16 participants was immobilized with a cast and participants were randomly assigned to a resistance training (eccentric wrist flexion, 3 times/week) or control group for four weeks...
December 14, 2017: Journal of Applied Physiology
https://www.readbyqxmd.com/read/29345963/deletion-of-estrogen-receptor-alpha-in-skeletal-muscle-results-in-impaired-contractility-in-female-mice
#12
Brittany C Collins, Tara L Mader, Christine A Cabelka, Melissa R Iñigo, Espen E Spangenburg, Dawn A Lowe
Estradiol deficiency in females can result in skeletal muscle strength loss, and treatment with estradiol mitigates the loss. There are three primary estrogen receptors and estradiol elicits effects through these receptors in various tissues. Ubiquitous estrogen receptor α (ERα) knockout mice exhibit numerous biological disorders, but little is known regarding the specific role of ERα in skeletal muscle contractile function. The purpose of this study was to determine the impact of skeletal muscle specific ERα deletion on contractile function, hypothesizing that ERα is a main receptor through which estradiol affects muscle strength in females...
January 18, 2018: Journal of Applied Physiology
https://www.readbyqxmd.com/read/29344331/the-peripheral-flicker-illusion
#13
Hiroyuki Ito, Tomomi Koizumi
A new illusion is reported. A visual object suddenly appearing on a red background sometimes causes an impression of flicker or double flash. In Experiment 1, a red, green, or blue object was presented on a red, green, blue, or gray background. Participants evaluated the illusion strength in reference to the physical flicker of a gray object presented in central vision. The results show that the green or blue object presented on the red background caused the illusion. In Experiment 2, the effect of retinal eccentricity on the illusion was tested...
November 2017: I-Perception
https://www.readbyqxmd.com/read/29339993/functional-and-muscle-size-effects-of-flywheel-resistance-training-with-eccentric-overload-in-professional-handball-players
#14
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/29338824/effects-of-preoperative-isokinetic-eccentric-training-and-whey-protein-isolate-supplement-on-quadriceps-strength-and-knee-function-in-patients-with-anterior-cruciate-ligament-rupture
#15
Xiao Yuan Zhang, Hong Shi Huang, Jie Yang, Yuan Yuan Yu, Dong Xia Zhang, Cui Qing Chang
Objective To explore the effect of preoperative isokinetic eccentric training with or not whey protein isolate supplement before operation on lower limb muscle strength and knee function in patients with anterior cruciate ligament (ACL) rupture. Methods A total of 22 male volunteers aged 18-40 years with ACL rupture were recruited in outpatient service. With randomized block design,subjects were randomly assigned to isokinetic eccentric training (IE) group and isokinetic eccentric training with whey protein isolate supplement (IE+WPI) group...
December 20, 2017: Zhongguo Yi Xue Ke Xue Yuan Xue Bao. Acta Academiae Medicinae Sinicae
https://www.readbyqxmd.com/read/29327824/are-there-bilateral-isokinetic-shoulder-rotator-differences-in-basketball-male-players
#16
Thierry Weissland, Maryne Cozette, Clare Doyle, Antoine Gabrion
BACKGROUND: The internal (IR) and external (ER) rotator shoulder strength are often assess in the upper limb sports to prevent a risk of injuries. The purpose of this comparative study was to measure the agonist/antagonist balance of shoulder strength and to determine whether significant differences exist between the dominant and nondominant sides in basketball players compared to a control groups. METHODS: During the championship, 23 elite male-basketball players (BB) and 23 healthy males (CG) were tested bilaterally on a Cybex Norm isokinetic dynamometer in a seated position with 45° shoulder abduction in the scapular plane at 60°...
January 10, 2018: Journal of Sports Medicine and Physical Fitness
https://www.readbyqxmd.com/read/29326892/role-of-transforming-growth-factor-%C3%AE-in-muscle-damage-and-regeneration-focused-on-eccentric-muscle-contraction
#17
REVIEW
Jooyoung Kim, Joohyung Lee
High-intensity eccentric muscle contraction induces muscle damage. Damaged muscles recover through different processes, including degeneration, inflammation, regeneration, and fibrosis; some of these processes are mediated through the actions of cytokines. The transforming growth factor-beta (TGF-β) is one such cytokine involved in muscle recovery and repair. In this regard, TGF-β regulates the skeletal muscle inflammatory response, inhibits muscle regeneration, regulates extracellular matrix remodeling, and promotes fibrosis...
December 2017: Journal of Exercise Rehabilitation
https://www.readbyqxmd.com/read/29321059/intrarater-reliability-of-the-humac-norm-isokinetic-dynamometer-for-strength-measurements-of-the-knee-and-shoulder-muscles
#18
Bas Habets, J Bart Staal, Marsha Tijssen, Robert van Cingel
OBJECTIVE: To determine the intrarater reliability of the Humac NORM isokinetic dynamometer for concentric and eccentric strength tests of knee and shoulder muscles. RESULTS: 54 participants (50% female, average age 20.9 ± 3.1 years) performed concentric and eccentric strength measures of the knee extensors and flexors, and the shoulder internal and external rotators on two different Humac NORM isokinetic dynamometers, which were situated at two different centers...
January 10, 2018: BMC Research Notes
https://www.readbyqxmd.com/read/29286514/cardiovascular-diseases-and-systolic-function-of-left-ventricle-in-clean-up-workers-of-chernobyl-accident-based-on-30-years-follow-up
#19
O D Bazyka, D O Belyi
OBJECTIVE: To study the dynamics of circulatory system diseases during the 30 year period after irradiation, changes in the status of systolic function of heart left ventricle (LV) and the features of its remodeling in clean up workers (CW) of the accident at the Chernobyl nuclear power plant (ChNPP). MATERIAL AND METHODS: It was examined 144 CW at ChNPP, including 52 patients, who survived acute radiation sick ness (ARS) grade of severity 1-3, and 105 non irradiated persons (control group - CG)...
December 2017: Problemy Radiat︠s︡iĭnoï Medyt︠s︡yny Ta Radiobiolohiï
https://www.readbyqxmd.com/read/29283704/reliability-validity-and-sensitivity-of-a-novel-smartphone-based-eccentric-hamstring-strength-test-in-professional-football-players
#20
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
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