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https://www.readbyqxmd.com/read/28432420/sex-differences-in-neuromuscular-function-after-repeated-eccentric-contractions-of-the-knee-extensor-muscles
#1
Andrea Lee, Jake Baxter, Claire Eischer, Matt Gage, Sandra Hunter, Tejin Yoon
PURPOSE: This study examined the mechanisms for force and power reduction during and up to 48 h after maximal eccentric contractions of the knee extensor muscles in young men and women. METHODS: 13 men (22.8 ± 2.6 years) and 13 women (21.6 ± 2.2 years) performed 150 maximal effort eccentric contractions (5 sets of 30) with the knee extensor muscles at 60° s(-1). Maximal voluntary isometric contractions (MVIC) and maximal voluntary concentric contractions (MVCC) were performed before and after the 150 eccentric contractions...
April 21, 2017: European Journal of Applied Physiology
https://www.readbyqxmd.com/read/28431618/muscle-strength-and-power-in-persons-with-multiple-sclerosis-a-systematic-review-and-meta-analysis
#2
REVIEW
Mlk Jørgensen, U Dalgas, I Wens, L G Hvid
BACKGROUND: Multiple sclerosis (MS) is a chronic disease in the central nervous system which causes a number of physical symptoms including impairments of muscle mechanical function (muscle strength, muscle power and explosive muscle strength (~rate of force development, RFD)). However, a full overview of the existing knowledge regarding muscle mechanical function in persons with MS (PwMS) is still pending. OBJECTIVES: To systematically review 1) the psychometric properties of isokinetic dynamometry testing in PwMS, and 2) studies comparing muscle mechanical function in PwMS to matched healthy controls (HC)...
May 15, 2017: Journal of the Neurological Sciences
https://www.readbyqxmd.com/read/28416087/the-impact-of-joint-angle-and-movement-velocity-on-sex-differences-in-the-functional-hamstring-quadriceps-ratio
#3
Mark De Ste Croix, Youssif O ElNagar, John Iga, Francisco Ayala, David James
BACKGROUND: Females are two to eight times more likely to suffer a non-contact injury compared with males thus the purpose of this study was to explore the influence of joint angle and movement velocity on sex differences in the functional hamstring to quadriceps ratio (H/QFUNC). METHODS: Isokinetic concentric and eccentric torque were determined in 110 participants (55 males and 55 females) through a 90° range of movement at 60, 120, and 240°/s. Testing was performed with the hip flexed at 10°...
April 13, 2017: Knee
https://www.readbyqxmd.com/read/28409517/could-the-negative-effects-of-static-stretching-in-warm-up-be-restored-by-sport-specific-exercise
#4
Victor Bengtsson, Ji-Guo Yu, Kajsa Gilenstam
BACKGROUND: Static stretching (SS) is widely used in warm-up as it is generally believed to increase mobility and reduce the risk of injury; however, SS has been shown to induce transient negative effects on subsequent muscle performance. Interestingly, recent studies have shown that sport specific exercise could restore SS-induced negative effects on certain sports, especially of explosive muscular performance. Whether sport specific exercise could restore SS-induced negative effects on isokinetic muscle performance remains unclear...
April 13, 2017: Journal of Sports Medicine and Physical Fitness
https://www.readbyqxmd.com/read/28409515/effects-of-stretching-and-fatigue-on-peak-torque-muscle-imbalance-and-stability
#5
Pablo B Costa, Cassio V Ruas, Cory M Smith
BACKGROUND: The present study examined the acute effects of hamstrings stretching and fatigue on knee extension and flexion peak torque (PT), hamstrings to quadriceps (H:Q) ratio, and postural stability. METHODS: Seventeen women (mean ± SD age = 21.8 ± 2.1 yrs; body mass = 63.0 ± 10.5 kg; height = 164.7 ± 6.2 cm) and eighteen men (25.8 ± 4.6 yrs; 83.6 ± 13.2 kg; 175.3 ± 6.0 cm) took part in three laboratory visits. The first visit was a familiarization session, and the subsequent two visits were randomly assigned as a control or stretching condition...
April 13, 2017: Journal of Sports Medicine and Physical Fitness
https://www.readbyqxmd.com/read/28409511/multimodal-assessment-of-sensorimotor-shoulder-function-in-patients-with-untreated-anterior-shoulder-instability-and-asymptomatic-handball-players
#6
Guillaume Mornieux, Anja Hirschmüller, Albert Gollhofer, Norbert P Südkamp, Dirk Maier
BACKGROUND: Functional evaluation of sensorimotor function of the shoulder joint is important for guidance of sports-specific training, prevention and rehabilitation of shoulder instability. Such assessment should be multimodal and comprise all qualities of sensorimotor shoulder function. This study evaluates feasibility of such multimodal assessment of glenohumeral sensorimotor function in patients with shoulder instability and handball players. METHODS: Nine patients with untreated anterior instability of their dominant shoulder and 15 asymptomatic recreational handball players performed proprioceptive joint position sense and dynamic stabilisation evaluations on an isokinetic device, as well as a functional throwing performance task...
April 13, 2017: Journal of Sports Medicine and Physical Fitness
https://www.readbyqxmd.com/read/28401310/the-efficacy-of-periodised-resistance-training-on-neuromuscular-adaptation-in-older-adults
#7
Jenny A Conlon, Robert U Newton, James J Tufano, Luis E Peñailillo, Harry G Banyard, Amanda J Hopper, Ashley J Ridge, G Gregory Haff
PURPOSE: This study compared the effect of periodised versus non-periodised (NP) resistance training on neuromuscular adaptions in older adults. METHODS: Forty-one apparently healthy untrained older adults (female = 21, male = 20; 70.9 ± 5.1 years; 166.3 ± 8.2 cm; 72.9 ± 13.4 kg) were recruited and randomly stratified to an NP, block periodised (BP), or daily undulating periodised (DUP) training group. Outcome measures were assessed at baseline and following a 22-week resistance training intervention (3 day week(-1)), including: muscle cross-sectional area (CSA), vertical jump performance, isometric and isokinetic peak torque, isometric rate of force development (RFD), and muscle activation...
April 11, 2017: European Journal of Applied Physiology
https://www.readbyqxmd.com/read/28400662/early-anterior-cruciate-ligament-reconstruction-can-save-meniscus-without-any-complications
#8
Chang-Ik Hur, Eun-Kyoo Song, Sung-Kyu Kim, Seung-Hun Lee, Jong-Keun Seon
BACKGROUND: Early ACL reconstruction, before retuning to activity eliminates recurrent episodes of instability and thereby decreases chances of meniscal and cartilage injury. However, there are no clear and uniform guidelines regarding the timing of ACL reconstruction or clarity in the definition of early and delayed reconstruction to reduce the complications after reconstruction in the ACL injured knee. The purpose of this study was to compare the clinical outcome, stability, muscle power, and postural control after early and delayed anterior cruciate ligament (ACL) reconstruction...
March 2017: Indian Journal of Orthopaedics
https://www.readbyqxmd.com/read/28399668/kinesiology-tape-mediates-soccer-simulated-and-local-peroneal-fatigue-in-soccer-players
#9
Claire Farquharson, Matt Greig
To investigate the efficacy of kinesiology taping in mediating the influence of fatigue on ankle sprain risk, 12 male soccer players completed single-leg dynamic balance trials pre- and post-exercise (soccer-specific protocol, isokinetic ankle inversion/eversion protocol) in each of three counter-balanced taping conditions (no tape, zinc oxide tape ZO, kinesiology tape KT). Balance was quantified as the overall stability index (OSI) and directional stability indices of platform deflection. Soccer-specific fatigue only increased OSI in the no tape condition (p = 0...
April 12, 2017: Research in Sports Medicine
https://www.readbyqxmd.com/read/28388783/the-reliability-and-validity-of-the-3-min-all-out-cycling-critical-power-test
#10
James Wright, Stewart Bruce-Low, Simon A Jobson
Research suggests that critical power (CP) can be estimated from a single 3-min bout of all-out cycling. The purpose of this study was to investigate the reliability and validity of the 3-min all-out cycling test when carried out at a constant cadence (isokinetic) and against a fixed resistance (linear). 12 participants completed 8 tests: 1) a ramp test; 2-4) 3 fixed power tests to calculate CP and W' using the 1/time mathematical model; 5-8) four 3-min all-out tests to calculate EP and WEP; 2 isokinetic and 2 linear tests...
April 7, 2017: International Journal of Sports Medicine
https://www.readbyqxmd.com/read/28388231/sex-differences-in-high-school-athletes-knowledge-of-sport-related-concussion-symptoms-and-reporting-behaviors
#11
Jessica Wallace, Tracey Covassin, Erica Beidler
CONTEXT:   Recent researchers have reported that athletes' knowledge of sport-related concussion (SRC) has increased but that athletes still lack knowledge of all the signs and symptoms of SRC. Understanding the signs and symptoms of SRC and the dangers of playing while symptomatic are critical to reporting behaviors in high school athletes. OBJECTIVE:   To examine sex differences in knowledge of SRC symptoms and reasons for not reporting a suspected SRC to an authoritative figure in high school athletes...
April 18, 2017: Journal of Athletic Training
https://www.readbyqxmd.com/read/28378509/hamstring-to-quadriceps-fatigue-ratio-offers-new-and-different-muscle-function-information-than-the-conventional-non-fatigued-ratio
#12
Matheus Daros Pinto, Anthony J Blazevich, Lars L Andersen, Pedro Mil-Homens, Ronei Silveira Pinto
Commonly used injury risk prediction tests such as the hamstring-to-quadriceps (H:Q) strength ratio appear to be poor predictors of non-contact injury. However, these tests are typically performed in a non-fatigued state, despite accumulated fatigue being an important risk factor for both hamstring strain (HS) and anterior cruciate ligament (ACL) injuries in professional soccer players PURPOSE: To examine the influence of neuromuscular fatigue on the H:Q strength ratio and the association between fatigued and non-fatigued ratio scores, after the effect of different H:Q calculation methods were compared and contrasted METHODS: Thirty-five professional soccer players performed a 30-repetition isokinetic fatigue test protocol...
April 4, 2017: Scandinavian Journal of Medicine & Science in Sports
https://www.readbyqxmd.com/read/28378465/cutoffs-of-isokinetic-strength-ratio-and-hamstring-strain-prediction-in-professional-soccer-players
#13
M Dauty, P Menu, A Fouasson-Chailloux
Hamstring strain injuries frequently occur during professional soccer practice. Low hamstring strength represents an intrinsic modifiable risk factor but cutoffs of isokinetic knee strength ratios are controversial to predict hamstring strain in professional soccer players. We aimed to predict hamstring strain in accordance with cutoffs of isokinetic knee strength ratios. Bilateral, conventional, and functional isokinetic strength ratios were calculated in 194 professional soccer players at the beginning of 15 consecutive seasons...
April 4, 2017: Scandinavian Journal of Medicine & Science in Sports
https://www.readbyqxmd.com/read/28370836/lower-limb-muscle-function-is-a-determinant-of-exercise-tolerance-after-lung-resection-surgery-in-patients-with-lung-cancer
#14
Chris Burtin, Frits M E Franssen, Lowie E G W Vanfleteren, Miriam T J Groenen, Emiel F M Wouters, Martijn A Spruit
BACKGROUND AND OBJECTIVE: This study aims to investigate the association between exercise tolerance, pulmonary function and lower-limb muscle function in patients with lung cancer who underwent lung resection surgery in the previous year. METHODS: Sixty-four patients (age: 67 ± 11 years, 66% males) performed a symptom-limited incremental cycle test to define peak oxygen consumption (VO2 peak) and peak workload (Wpeak). The best of two 6-min walking distance (6MWD) tests was also included...
March 30, 2017: Respirology: Official Journal of the Asian Pacific Society of Respirology
https://www.readbyqxmd.com/read/28364615/strength-and-endurance-training-reduces-the-loss-of-eccentric-hamstring-torque-observed-after-soccer-specific-fatigue
#15
Martyn J Matthews, Kate Heron, Stefanie Todd, Andrew Tomlinson, Paul Jones, Anne Delextrat, Daniel D Cohen
OBJECTIVES: To investigate the effect of two hamstring training protocols on eccentric peak torque before and after soccer specific fatigue. PARTICIPANTS: Twenty-two university male soccer players. DESIGN: Isokinetic strength tests were performed at 60°/s pre and post fatigue, before and after 2 different training interventions. A 45-min soccer specific fatigue modified BEAST protocol (M-BEAST) was used to induce fatigue. Players were randomly assigned to a 4 week hamstrings conditioning intervention with either a maximum strength (STR) or a muscle endurance (END) emphasis...
February 2, 2017: Physical Therapy in Sport
https://www.readbyqxmd.com/read/28363433/improved-skeletal-muscle-mass-and-strength-after-heavy-strength-training-in-very-old-individuals
#16
Rasmus Leidesdorff Bechshøft, Nikolaj Mølkjær Malmgaard-Clausen, Bjørn Gliese, Nina Beyer, Abigail L Mackey, Jesper Løvind Andersen, Michael Kjær, Lars Holm
Age-related loss of muscle mass and function represents personal and socioeconomic challenges. The purpose of this study was to determine the adaptation of skeletal musculature in very old individuals (83+ years) performing 12weeks of heavy resistance training (3×/week) (HRT) compared to a non-training control group (CON). Both groups received similar protein supplementations. We studied 26 participants (86.9±3.2 (SD) (83-94, range) years old) per-protocol. Quadriceps cross-sectional area (CSA) differed between groups at post-test (P<0...
June 2017: Experimental Gerontology
https://www.readbyqxmd.com/read/28363421/the-effect-of-femoral-nerve-block-on-quadriceps-strength-in-anterior-cruciate-ligament-reconstruction-a-systematic-review
#17
REVIEW
Katherine R Swank, Alex C DiBartola, Joshua S Everhart, Christopher C Kaeding, Robert A Magnussen, David C Flanigan
PURPOSE: To assess the isokinetic, functional, and patient-reported outcomes of femoral nerve block (FNB) compared with traditional multimodal anesthesia for FNB in anterior cruciate ligament (ACL) reconstruction. METHODS: A systematic search of PubMed, Scopus, Cumulative Index to Nursing and Allied Health Literature, Cochrane Reviews, and Google Scholar was conducted according to the 2009 Preferred Reporting Items for Systematic Reviews and Meta-Analyses guidelines...
March 28, 2017: Arthroscopy: the Journal of Arthroscopic & related Surgery
https://www.readbyqxmd.com/read/28357922/reliability-assessment-and-correlation-analysis-of-3-protocols-to-measure-trunk-muscle-strength-and-endurance
#18
Casto Juan-Recio, Diego López-Plaza, David Barbado Murillo, M Pilar García-Vaquero, Francisco J Vera-García
Different methods have been developed to quantify trunk muscle strength and endurance. However, some important protocol characteristics are still unclear, hindering the selection of the most suitable tests in each specific situation. The aim of this study was to examine the reliability and the relationship between 3 representative tests of the most common type of protocols used to assess trunk muscle strength and endurance. Twenty-seven healthy men performed each test twice spaced 1 month apart.Trunk strength and endurance were evaluated with an isokinetic dynamometer and 2 field tests including Biering-Sørensen test and Flexion-rotation trunk test...
March 30, 2017: Journal of Sports Sciences
https://www.readbyqxmd.com/read/28349042/effects-of-strength-and-neuromuscular-training-on-functional-performance-in-athletes-after-partial-medial-meniscectomy
#19
Xiaohui Zhang, Min Hu, Zhen Lou, Bagen Liao
The aims of this study were to determine an effective knee function rehabilitation program for athletes undergoing partial medial meniscectomy. Participants were randomly assigned to neuromuscular training (NT) or strength training (ST) group and subjected to functional assessments before surgery and again at 4, and 8 weeks post hoc. Functional knee assessment, such as Lysholm knee scoring, star excursion balance, and BTE PrimusRS isokinetic performance tests were evaluated in each group. All postoperational symptoms were significantly improved after 4 and 8 weeks of NT and ST...
February 2017: Journal of Exercise Rehabilitation
https://www.readbyqxmd.com/read/28349035/characteristics-of-upper-extremity-s-muscle-strength-in-turkish-national-wheelchair-basketball-players-team
#20
Bihter Akınoğlu, Tuğba Kocahan
The objective of this study was to reveal characteristics of muscle strength of upper extremities of wheelchair (WC) basketball players and to ensure more-specific training program preparation. Isokinetic muscle strength of 12 WC basketball players were assessed by ISOMED 2000 device. The assessment protocol was evaluated at 60°/sec velocity with 5 times repeated force and at 240°/sec with 15 times repeated force. This protocol was carried out individually for shoulder flexion-extension and wrist flexion-extension movements at the right and left extremities...
February 2017: Journal of Exercise Rehabilitation
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