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https://www.readbyqxmd.com/read/28543791/the-association-between-eccentric-hip-abduction-strength-and-hip-and-knee-angular-movements-in-recreational-male-runners-an-explorative-study
#1
René B K Brund, Sten Rasmussen, Rasmus O Nielsen, Uwe G Kersting, Uffe Laessoe, Michael Voigt
Weak hip abductors may be related with increased hip adduction and knee abduction angular movement, which may be risk factors of lower extremity injuries. Since the role of eccentric hip abduction strength (EHAS) on hip adduction angular movement and the knee abduction angular movement (KABD) remains unclear and the purpose of the present study was to explore the association between EHAS and hip- and knee angular movement. In 100 healthy male recreational runners, EHAS was quantified using an isokinetic dynamometer, while hip- and knee angular movement were collected using pressure sensitive treadmill and Codamotion active marker system...
May 24, 2017: Scandinavian Journal of Medicine & Science in Sports
https://www.readbyqxmd.com/read/28533692/changes-in-muscle-strength-after-diet-induced-weight-reduction-in-adult-men-with-obesity-a-prospective-study
#2
Bokun Kim, Takehiko Tsujimoto, Rina So, Xiaoguang Zhao, Sechang Oh, Kiyoji Tanaka
BACKGROUND AND OBJECTIVE: The benefits of weight reduction for musculoskeletal disorders are well understood. Steep declines in muscle mass following considerable weight reduction can decrease muscle strength and, consequently, physical performance. However, only a limited number of studies have examined the changes in muscle mass and strength in the context of interventional weight reduction programs. Thus, we investigated the influence of muscle mass decrease caused by diet-induced weight reduction on muscle strength in obese men...
2017: Diabetes, Metabolic Syndrome and Obesity: Targets and Therapy
https://www.readbyqxmd.com/read/28528093/kinetic-and-thermodynamic-compensation-a-current-and-practical-review-for-foods
#3
REVIEW
Alfonso Garvín, Raquel Ibarz, Albert Ibarz
Kinetic and thermodynamic compensations have been reported in many chemical, physical, biological and food processes. Kinetic compensation can be found for any process and when it takes place, it gives information about the reaction mechanism and whether the reaction is controlled by enthalpy or entropy. It consists of the linear relationship between the logarithm of the frequency factor (lnk0) and the activation energy (Ea), both previously obtained from the Arrhenius equation for different values of an environmental variable (e...
June 2017: Food Research International
https://www.readbyqxmd.com/read/28515976/the-acute-effects-of-concentric-versus-eccentric-muscle-fatigue-on-shoulder-active-repositioning-sense
#4
Guido Spargoli
PURPOSE/BACKGROUND: Shoulder proprioception is essential in the activities of daily living as well as in sports. Acute muscle fatigue is believed to cause a deterioration of proprioception, increasing the risk of injury. The purpose of this study was to evaluate if fatigue of the shoulder external rotators during eccentric versus concentric activity affects shoulder joint proprioception as determined by active reproduction of position. STUDY DESIGN: Quasi-experimental trial...
April 2017: International Journal of Sports Physical Therapy
https://www.readbyqxmd.com/read/28508114/oral-l-menthol-reduces-thermal-sensation-increases-work-rate-and-extends-time-to-exhaustion-in-the-heat-at-a-fixed-rating-of-perceived-exertion
#5
T R Flood, M Waldron, O Jeffries
PURPOSE: The study investigated the effect of a non-thermal cooling agent, L-menthol, on exercise at a fixed subjective rating of perceived exertion (RPE) in a hot environment. METHOD: Eight male participants completed two trials at an exercise intensity between 'hard' and 'very hard', equating to 16 on the RPE scale at ~35 °C. Participants were instructed to continually adjust their power output to maintain an RPE of 16 throughout the exercise trial, stopping once power output had fallen by 30%...
May 15, 2017: European Journal of Applied Physiology
https://www.readbyqxmd.com/read/28503531/relationship-between-cardiopulmonary-responses-and-isokinetic-moments-the-optimal-angular-velocity-for-muscular-endurance
#6
Chan-Bok Lee, Denny Eun, Kang-Ho Kim, Jae-Wan Park, Yong-Seok Jee
Most protocols for testing and rehabilitation for recovery and improvement of muscular endurance have been set at 180°/sec, 240°/sec, and 300°/sec. These protocols can cause confusion to clinical providers or other researchers. This study was aimed at investigating the optimal isokinetic angular speed for measuring or developing muscular endurance after assessing the relationship between cardiopulmonary responses and isokinetic moments. This study was conducted with 31 male and female college students. Graded exercise test and body composition were measured as well as the isokinetic moments of the knee muscles at three angular speeds: 180°/sec, 240°/sec, and 300°/sec...
April 2017: Journal of Exercise Rehabilitation
https://www.readbyqxmd.com/read/28492718/effects-of-motor-learning-on-clinical-isokinetic-test-performance-in-knee-osteoarthritis-patients
#7
José Messias Rodrigues-da-Silva, Márcia Uchoa de Rezende, Tânia Carvalho Spada, Lucila da Silva Francisco, Júlia Maria D'Andréa Greve, Emmanuel Gomes Ciolac
OBJECTIVES: To analyze the effects of motor learning on knee extension-flexion isokinetic performance in knee osteoarthritis patients. METHODS: One hundred and thirty-six middle-aged and older sedentary individuals (111 women, 64.3±9.9 years) with knee osteoarthritis (130 patients with bilateral) and who had never performed isokinetic testing underwent two bilateral knee extension-flexion (concentric-concentric) isokinetic evaluations (5 repetitions) at 60°/sec...
April 2017: Clinics
https://www.readbyqxmd.com/read/28486729/effects-of-synchronous-whole-body-vibration-training-on-a-soft-unstable-surface-in-athletes-with-chronic-ankle-instability
#8
Rafael Sierra-Guzmán, Jose Fernando Jiménez, Carlos Ramírez, Paula Esteban, Javier Abián-Vicén
The aim of this study was to evaluate the effects of a 6-week WBV training program, performed on a soft, unstable surface, on peak torque, reaction time and the electrical activity of ankle muscles in recreational athletes with chronic ankle instability (CAI). 50 recreational athletes with self-reported unilateral CAI were randomly assigned to a vibration group (VIB), non-vibration group (N-VIB) or control group. The VIB and N-VIB groups performed unilateral balance training on the unstable ankle on a BOSU(®) Balance Trainer 3 times weekly for 6 weeks...
May 9, 2017: International Journal of Sports Medicine
https://www.readbyqxmd.com/read/28475487/can-somatosensory-electrical-stimulation-relieve-spasticity-in-post-stroke-patients-a-tms-pilot-study
#9
André Salles Cunha Peres, Victor Hugo Souza, João Marcos Yamasaki Catunda, Kelley Cristine Mazzeto-Betti, Taiza Elaine Grespan Santos-Pontelli, Claudia Domingues Vargas, Oswaldo Baffa, Draulio Barros de Araújo, Octávio Marques Pontes-Neto, João Pereira Leite, Marco Antonio Cavalcanti Garcia
Evidence suggests that somatosensory electrical stimulation (SES) may decrease the degree of spasticity from neural drives, although there is no agreement between corticospinal modulation and the level of spasticity. Thus, stroke patients and healthy subjects were submitted to SES (3 Hz) for 30' on the impaired and dominant forearms, respectively. Motor evoked potentials induced by single-pulse transcranial magnetic stimulation were collected from two forearm muscles before and after SES. The passive resistance of the wrist joint was measured with an isokinetic system...
May 5, 2017: Biomedizinische Technik. Biomedical Engineering
https://www.readbyqxmd.com/read/28474785/protein-timing-during-the-day-and-its-relevance-for-muscle-strength-and-lean-mass
#10
Samuel L Buckner, Jeremy P Loenneke, Paul D Loprinzi
Protein consumption and its association with changes in body composition, muscle function and different strategies to optimize the muscle protein synthetic response have received considerable attention. However, we are not aware of any epidemiological study examining the time-of-day consumption (afternoon versus evening) of protein on strength and lean mass. The purpose was to examine the associations between afternoon and evening protein consumption, at different protein thresholds (i.e. 15, 20, 25 and 30 g), in relation to leg lean mass and knee extensor strength in men...
May 5, 2017: Clinical Physiology and Functional Imaging
https://www.readbyqxmd.com/read/28469740/isokinetic-dynamometry-and-1rm-tests-produce-conflicting-results-for-assessing-alterations-in-muscle-strength
#11
Paulo Gentil, Fabricio Boscolo Del Vecchio, Antonio Paoli, Brad J Schoenfeld, Martim Bottaro
The purpose of this study was to compare strength gains in the lower limbs, assessed by one maximum repetition (1RM) and isokinetic peak torque (PT), in young men undergoing a resistance training (RT) program. Twenty-seven young men performed resistance training twice a week for 11 weeks. Training involved two exercises for the lower body, two for the upper body and one for the midsection performed with three sets of 8-12 repetitions to momentary muscle failure. Before and after the training period, participants performed the 1RM test in the 45° leg press and knee extension PT in isokinetic dynamometry...
February 2017: Journal of Human Kinetics
https://www.readbyqxmd.com/read/28469023/the-active-force-length-relationship-is-invisible-during-extensive-eccentric-contractions-in-skinned-skeletal-muscle-fibres
#12
André Tomalka, Christian Rode, Jens Schumacher, Tobias Siebert
In contrast to experimentally observed progressive forces in eccentric contractions, cross-bridge and sliding-filament theories of muscle contraction predict that varying myofilament overlap will lead to increases and decreases in active force during eccentric contractions. Non-cross-bridge contributions potentially explain the progressive total forces. However, it is not clear whether underlying abrupt changes in the slope of the nonlinear force-length relationship are visible in long isokinetic stretches, and in which proportion cross-bridges and non-cross-bridges contribute to muscle force...
May 17, 2017: Proceedings. Biological Sciences
https://www.readbyqxmd.com/read/28467857/one-night-of-sleep-restriction-following-heavy-exercise-impairs-3-km-cycling-time-trial-performance-in-the-morning
#13
John D Chase, Paul A Roberson, Michael J Saunders, Trent A Hargens, Christopher J Womack, Nicholas D Luden
The goal of this project was to examine the influence of a single night of sleep restriction following heavy exercise on cycling time trial performance (TT) and skeletal muscle function in the morning. Seven recreational cyclists (age, 24 ± 7 yrs; VO2peak, 62 ± 4 ml・kg-1・min-1) completed two phases, each consisting of evening (EX1) and next-morning (EX2) exercise sessions. EX1 and EX2 were separated by an assigned sleep condition; a full night of rest (CON, 7.1 ± 0.3 hrs of sleep) or sleep restriction through early waking (SR, 2...
May 3, 2017: Applied Physiology, Nutrition, and Metabolism, Physiologie Appliquée, Nutrition et Métabolisme
https://www.readbyqxmd.com/read/28463902/practicing-the-test-produces-strength-equivalent-to-higher-volume-training
#14
Kevin T Mattocks, Samuel L Buckner, Matthew B Jessee, Scott J Dankel, J Grant Mouser, Jeremy P Loenneke
PURPOSE: To determine if muscle growth is important for increasing muscle strength or if changes in strength can be entirely explained from practicing the strength test. METHODS: Thirty-eight untrained individuals performed knee extension and chest press exercise for 8 weeks. Individuals were randomly assigned to either a high-volume training group (HYPER) or a group just performing the one repetition maximum (1RM) strength test (TEST). The HYPER group performed 4 sets to volitional failure (~8-12RM) while the TEST group performed up to 5 attempts to lift as much weight as possible one time each visit...
May 2, 2017: Medicine and Science in Sports and Exercise
https://www.readbyqxmd.com/read/28459885/a-statistically-compiled-test-battery-for-feasible-evaluation-of-knee-function-after-rupture-of-the-anterior-cruciate-ligament-derived-from-long-term-follow-up-data
#15
Lina Schelin, Eva Tengman, Patrik Ryden, Charlotte Häger
PURPOSE: Clinical test batteries for evaluation of knee function after injury to the Anterior Cruciate Ligament (ACL) should be valid and feasible, while reliably capturing the outcome of rehabilitation. There is currently a lack of consensus as to which of the many available assessment tools for knee function that should be included. The present aim was to use a statistical approach to investigate the contribution of frequently used tests to avoid redundancy, and filter them down to a proposed comprehensive and yet feasible test battery for long-term evaluation after ACL injury...
2017: PloS One
https://www.readbyqxmd.com/read/28459795/four-weeks-of-nordic-hamstring-exercise-reduce-muscle-injury-risk-factors-in-young-adults
#16
João Breno de A R Alvares, Vanessa Bernardes Marques, Marco Aurélio Vaz, Bruno Manfredini Baroni
The Nordic hamstring exercise (NHE) is a field-based exercise designed for knee-flexor eccentric strengthening, aimed at muscle strains prevention. However, possible effects of NHE programmes on other hamstring injury risk factors remain unclear. The purpose of this study was to investigate the effects of a NHE training programme on multiple hamstring injury risk factors. Twenty physically active young adults were allocated into two equal sized groups: control group (CG) and training group (TG). The TG was engaged in a 4-week NHE programme, twice a week, 3 sets of 6-10 repetitions; while CG received no exercise intervention...
April 26, 2017: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/28452837/factors-related-to-self-rated-health-in-older-adults-a-clinical-approach-using-the-international-classification-of-functioning-disability-and-health-icf-model
#17
Chad W Tiernan, Hali A Fleishman, Meghann A Hiscox, Sarah N Shaver, Caitlyn M Stauffer, Patrick A W Thibodeau
BACKGROUND AND PURPOSE: A growing population of older adults will require health care professionals to become increasingly knowledgeable in geriatric care. Patient ratings, functional measures, and emphasis on health and wellness should be part of geriatric physical therapy practice. The purpose of the current study was to examine relationships between self-rated health (SRH) and movement-related variables in older adults using the International Classification of Functioning, Disability, and Health (ICF) as a research framework...
April 27, 2017: Journal of Geriatric Physical Therapy
https://www.readbyqxmd.com/read/28452832/shoulder-dynamic-control-ratio-and-rotation-range-of-motion-in-female-junior-elite-handball-players-and-controls
#18
Robert van Cingel, Bas Habets, Linn Willemsen, Bart Staal
OBJECTIVE: To compare glenohumeral range of motion and shoulder rotator muscle strength in healthy female junior elite handball players and controls. DESIGN: Cross-sectional case-control study. SETTING: Sports medical center. PARTICIPANTS: Forty elite female handball players and 30 controls active in nonoverhead sports participated in this study. MAIN OUTCOME MEASURES: Passive external rotator (ER), internal rotator (IR), and total range of motion (TROM) of the dominant and nondominant arm were examined with a goniometer...
April 27, 2017: Clinical Journal of Sport Medicine: Official Journal of the Canadian Academy of Sport Medicine
https://www.readbyqxmd.com/read/28448852/reproducibility-of-scapular-muscle-activity-in-isokinetic-shoulder-flexion-and-extension
#19
Monique Wochatz, Sophie Rabe, Martin Wolter, Tilman Engel, Steffen Mueller, Frank Mayer
Repetitive overhead movements have been identified as a main risk factor to develop shoulder complaints with scapular muscle activity being altered. Reliable assessment of muscle activity is essential to differentiate between symptomatic and asymptomatic individuals. Therefore, the present study aimed to investigate the intra- and inter-session reliability of scapular muscle activity during maximal isokinetic shoulder flexion and extension. Eleven asymptomatic adults performed maximum effort isokinetic shoulder flexion and extension (concentric and eccentric at 60°/s) in a test-retest design...
April 13, 2017: Journal of Electromyography and Kinesiology
https://www.readbyqxmd.com/read/28447186/comparison-of-the-recovery-response-from-high-intensity-and-high-volume-resistance-exercise-in-trained-men
#20
Sandro Bartolomei, Eliahu Sadres, David D Church, Eliott Arroyo, Joseph A Gordon Iii, Alyssa N Varanoske, Ran Wang, Kyle S Beyer, Leonardo P Oliveira, Jeffrey R Stout, Jay R Hoffman
PURPOSE: The purpose of this study was to compare the physiological responses of a high-volume (HV; 8 sets of 10 repetitions) versus high-intensity (HI; 8 sets of 3 repetitions) exercise protocol in resistance-trained men. METHODS: Twelve men (24.5 ± 4.2 years; 82.3 ± 8.4 kg; 175.2 ± 5.5 cm) with 6.3 ± 3.4 years of resistance training experience performed each protocol in a counterbalanced, randomized order. Performance [counter movement jump peak power (CMJP), isokinetic (ISOK) and isometric leg extension (MVIC), isometric mid-thigh pull (IMTP), and isometric squat (ISQ)] and muscle morphological [cross-sectional area (CSA) of vastus lateralis] assessments were performed at baseline (BL), 30-min (P-30 min), 24-h (P-24 h), 48-h (P-48 h), and 72-h (P-72 h) post-exercise for each testing session...
April 26, 2017: European Journal of Applied Physiology
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