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https://www.readbyqxmd.com/read/28934634/comparison-of-shoulder-strength-in-males-with-and-without-myofascial-trigger-points-in-the-upper-trapezius
#1
H A Kim, U J Hwang, S H Jung, S H Ahn, J H Kim, O Y Kwon
BACKGROUND: This study was conducted in order to compare the strength of scapular elevator and shoulder abductor with and without restricted scapular elevation between male subjects with and without myofascial trigger points in the upper trapezius. METHODS: In total, 15 male subjects with myofascial trigger points, and 15age- and weight-matched male subjects without myofascial trigger points in the upper trapezius. Each subject was measured in the strength of maximum isometric scapular elevation and shoulder abduction with and without restricted scapular elevation...
September 6, 2017: Clinical Biomechanics
https://www.readbyqxmd.com/read/28934632/in-vivo-biomechanical-behavior-of-the-trapeziometacarpal-joint-in-healthy-and-osteoarthritic-subjects
#2
Priscilla D'Agostino, Benjamin Dourthe, Faes Kerkhof, G Harry Van Lenthe, Filip Stockmans, Evie E Vereecke
BACKGROUND: The contact biomechanics of the trapeziometacarpal joint have been investigated in several studies. However, these led to conflicting results and were mostly performed in vitro. The purpose of this study was to provide further insight on the contact biomechanics of the trapeziometacarpal joint by in vivo assessment of healthy and osteoarthritic subjects. METHODS: The hands of 16 healthy women and 6 women with trapeziometacarpal osteoarthritis were scanned in positions of maximal thumb extension, flexion, abduction and adduction during three isometric tasks (lateral key pinch, power grasp and jar twist) and in thumb rest posture (relaxed neutral)...
September 12, 2017: Clinical Biomechanics
https://www.readbyqxmd.com/read/28934100/differences-in-the-movement-skills-and-physical-qualities-of-elite-senior-academy-rugby-league-players
#3
Matthew R E Ireton, Kevin Till, Dan Weaving, Ben Jones
The aim of the present study was to investigate (a) the differences in the movement skills and physical qualities between academy and senior rugby league players, and (b) the relationships between movement skills and physical qualities. Fifty-five male rugby league players (Senior, n=18; Under 19 n=23; Under 16, n=14) undertook a physical testing battery including anthropometric (stature & body mass), strength (isometric mid-thigh pull; IMTP) and power (countermovement jump; CMJ) qualities, alongside the athletic ability assessment (AAA; comprised of overhead squat, double lunge, single-leg Romanian deadlift, press-up and pull-up exercises)...
June 2, 2017: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/28933713/adaptations-associated-with-an-after-school-strength-and-conditioning-program-in-middle-school-aged-boys-a-quasi-experimental-design
#4
Brennan J Thompson, Matt S Stock, Jacob A Mota, Alexander S Drusch, Ryan N DeFranco, Tyler R Cook, Matthew A Hamm
Thompson, BJ, Stock, MS, Mota, JA, Drusch, AS, DeFranco, RN, Cook, TR, and Hamm, MA. Adaptations associated with an after-school strength and conditioning program in middle-school aged boys: a quasi-experimental design. J Strength Cond Res 31(10): 2840-2851, 2017-High-intensity strength and conditioning programs aimed at improving youth performance are becoming increasingly prevalent. The purpose of this study was to investigate the effects of a 16-week after-school strength and conditioning program on performance and body composition in middle-school-aged boys...
October 2017: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/28933711/the-effect-of-hip-joint-angle-on-isometric-midthigh-pull-kinetics
#5
Thomas DosʼSantos, Christopher Thomas, Paul A Jones, John J McMahon, Paul Comfort
Dos'Santos, T, Thomas, C, Jones, PA, McMahon, JJ, and Comfort, P. The effect of hip joint angle on isometric midthigh pull kinetics. J Strength Cond Res 31(10): 2748-2757, 2017-The aim of this study were to compare isometric midthigh pull (IMTP) peak force (PF), time-specific force values (100-, 150-, and 200 ms), rate of force development (RFD) at predetermined time bands (0-100, 0-150, and 0-200 ms) and net forces between 2 commonly adopted hip joint angles (145°[hip145] and 175°[hip175]) with a 145° standardized knee angle...
October 2017: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/28933605/early-active-rehabilitation-after-arthroscopic-rotator-cuff-repair-a-prospective-randomized-pilot-study
#6
Rudolf Raschhofer, Nikos Poulios, Wolfgang Schimetta, Rüdiger Kisling, Christian Mittermaier
OBJECTIVE: To compare two different rehabilitation strategies, primary passive motion versus early isometric loading of the rotator cuff. DESIGN: Prospective randomized controlled observer-blinded pilot study. SETTING: Institute of Physical Medicine and Rehabilitation. SUBJECTS: Thirty patients after rotator cuff surgery. INTERVENTION: All participants were randomly assigned to one of the two outpatient treatment groups: primary passive motion versus early isometric loading of the rotator cuff...
October 2017: Clinical Rehabilitation
https://www.readbyqxmd.com/read/28932987/effects-of-hand-configuration-on-muscle-force-coordination-co-contraction-and-concomitant-intermuscular-coupling-during-maximal-isometric-flexion-of-the-fingers
#7
Camille Charissou, David Amarantini, Robin Baurès, Eric Berton, Laurent Vigouroux
PURPOSE: The mechanisms governing the control of musculoskeletal redundancy remain to be fully understood. The hand is highly redundant, and shows different functional role of extensors according to its configuration for a same functional task of finger flexion. Through intermuscular coherence analysis combined with hand musculoskeletal modelling during maximal isometric hand contractions, our aim was to better understand the neural mechanisms underlying the control of muscle force coordination and agonist-antagonist co-contraction...
September 20, 2017: European Journal of Applied Physiology
https://www.readbyqxmd.com/read/28932752/local-rhbmp-12-on-an-absorbable-collagen-sponge-as-an-adjuvant-therapy-for-rotator-cuff-repair-a-phase-1-randomized-standard-of-care-control-multicenter-study-part-2-a-pilot-study-of-functional-recovery-and-structural-outcomes
#8
Junji Ide, Yu Mochizuki, Arthur van Noort, Hiroshi Ochi, Sudhakar Sridharan, Eiji Itoi, Stefan Greiner
BACKGROUND: The high failure rate of rotator cuff repairs requires the development of methods to enhance healing at the tendon-bone junction of the repair site. PURPOSE: To assess functional recovery and structural outcomes in detail after implanting recombinant human bone morphogenetic protein-12 (rhBMP-12)/absorbable collagen sponge (ACS) as adjuvant treatment during open rotator cuff repair in patients over a 1-year postoperative follow-up. STUDY DESIGN: Randomized controlled trial; Level of evidence, 2...
September 2017: Orthopaedic Journal of Sports Medicine
https://www.readbyqxmd.com/read/28932190/empirical-evaluation-of-voluntarily-activatable-muscle-synergies
#9
Shunta Togo, Hiroshi Imamizu
The muscle synergy hypothesis assumes that individual muscle synergies are independent of each other and voluntarily controllable. However, this assumption has not been empirically tested. This study tested if human subjects can voluntarily activate individual muscle synergies extracted by non-negative matrix factorization (NMF), the standard mathematical method for synergy extraction. We defined the activation of a single muscle synergy as the generation of a muscle activity pattern vector parallel to the single muscle synergy vector...
2017: Frontiers in Computational Neuroscience
https://www.readbyqxmd.com/read/28931612/cue-induced-changes-in-the-stability-of-finger-force-production-tasks-revealed-by-the-uncontrolled-manifold-analysis
#10
Satyajit S Ambike, Mitchell Tillman
A motor system configured to maximize the stability of its current state cannot dexterously transition between states. Yet, we routinely resolve the stability-dexterity conflict and rapidly change our current behavior without allowing it to become unstable prior to the desired transition. The phenomenon called anticipatory synergy adjustment (ASA) partly describes how the central nervous system handles this conflict. ASA is a continuous decrease in the stability of the current motor state beginning 150-400 ms prior to a rapid state transition accomplished using redundant sets of motor inputs (more input variables than task-specific output variables)...
September 20, 2017: Journal of Neurophysiology
https://www.readbyqxmd.com/read/28930862/an-innovative-ergometer-to-measure-neuromuscular-fatigue-immediately-after-cycling
#11
Douglas Doyle-Baker, John Temesi, Mary E Medysky, Robert J Holash, Guillaume Y Millet
PURPOSE: When assessing neuromuscular fatigue (NMF) from dynamic exercise using large muscle mass (e.g. cycling), most studies have delayed measurement for 1-3 min after task failure. This study aimed to determine the reliability of an innovative cycling ergometer permitting the start of fatigue measurement within 1 s after cycling. METHODS: Twelve subjects participated in two experimental sessions. Knee-extensor NMF was assessed by electrical nerve and transcranial magnetic stimulation with both a traditional chair set-up (PRE and POST-Chair, 2 min post-exercise) and the new cycling ergometer (PRE, every 3 min during incremental exercise and POST-Bike, at task failure)...
September 19, 2017: Medicine and Science in Sports and Exercise
https://www.readbyqxmd.com/read/28929936/time-course-of-the-acute-effects-of-core-stabilisation-exercise-on-seated-postural-control
#12
Jordan B Lee, Stephen H M Brown
Core stabilisation exercises are often promoted for purposes ranging from general fitness to high-performance athletics, and the prevention and rehabilitation of back troubles. These exercises, when performed properly, may have the potential to enhance torso postural awareness and control, yet the potential for achieving immediate gains has not been completely studied. Fourteen healthy young participants performed a single bout of non-fatiguing core stabilisation exercise that consisted of repeated sets of 2 isometric exercises, the side bridge and the four-point contralateral arm-and-leg extension...
September 20, 2017: Sports Biomechanics
https://www.readbyqxmd.com/read/28929509/task-dependent-output-of-human-parasternal-intercostal-motor-units-across-spinal-levels
#13
Anna L Hudson, Simon C Gandevia, Jane E Butler
During inspiration, there is differential activity in the human parasternal intercostal muscles across interspaces. We studied if the earlier recruitment of motor units in the rostral interspaces, compared to more caudal spaces, during inspiration is preserved for the non-respiratory task of ipsilateral trunk rotation. Single motor unit activity (SMU) was recorded from the first, second and fourth parasternal interspaces on the right side in five participants in two tasks: resting breathing and 'isometric' axial rotation of the trunk during apnoea...
September 20, 2017: Journal of Physiology
https://www.readbyqxmd.com/read/28928032/reliability-of-surface-electromyography-activity-of-gluteal-and-hamstring-muscles-during-sub-maximal-and-maximal-voluntary-isometric-contractions
#14
Melanie D Bussey, Daniela Aldabe, Divya Adhia, Ramakrishnan Mani
BACKGROUND: Normalizing to a reference signal is essential when analysing and comparing electromyography signals across or within individuals. However, studies have shown that MVC testing may not be as reliable in persons with acute and chronic pain. OBJECTIVES: The purpose of this study was to compare the test-retest reliability of the muscle activity in the biceps femoris and gluteus maximus between a novel sub-MVC and standard MVC protocols. METHODS: This study utilized a single individual repeated measures design with 12 participants performing multiple trials of both the sub-MVC and MVC tasks on two separate days...
September 11, 2017: Musculoskeletal Science & Practice
https://www.readbyqxmd.com/read/28927901/age-related-reductions-in-muscle-quality-influence-the-relative-differences-in-strength-and-power
#15
Gena R Gerstner, Hayden K Giuliani, Jacob A Mota, Eric D Ryan
Age-related changes in the relative differences in isokinetic strength and power may reflect fast twitch fiber function. We aimed to examine the influence of muscle quality on the relative differences in strength and power in younger and older men. Twenty younger (20.1±1.5yrs) and 20 older (69.5±3.1yrs) healthy, recreationally active men performed two plantarflexion maximal voluntary isometric contractions (MVCs) and three maximal concentric isokinetic contractions at a slow (0.52rad·s(-1)) and fast (2.09rad·s(-1)) velocity...
September 16, 2017: Experimental Gerontology
https://www.readbyqxmd.com/read/28923548/survival-of-extensively-damaged-endodontically-treated-incisors-restored-with-different-types-of-posts-and-core-foundation-restoration-material
#16
Priscilla Cardoso Lazari, Marco Aurélio de Carvalho, Altair A Del Bel Cury, Pascal Magne
STATEMENT OF PROBLEM: Which post-and-core combination will best improve the performance of extensively damaged endodontically treated incisors without a ferrule is still unclear. PURPOSE: The purpose of this in vitro study was to investigate the restoration of extensively damaged endodontically treated incisors without a ferrule using glass-ceramic crowns bonded to various composite resin foundation restorations and 2 types of posts. MATERIAL AND METHODS: Sixty decoronated endodontically treated bovine incisors without a ferrule were divided into 4 groups and restored with various post-and-core foundation restorations...
September 16, 2017: Journal of Prosthetic Dentistry
https://www.readbyqxmd.com/read/28922213/elastic-resistance-effectiveness-on-increasing-strength-of-shoulders-and-hips
#17
Kelsey J Picha, Muataz R Almaddah, Jordan Barker, Tavis Ciochetty, W Scott Black, Tim L Uhl
Elastic resistance is a common training method used to gain strength. Currently, progression with elastic resistance is based on the perceived exertion of the exercise or completion of targeted repetitions; exact resistance is typically unknown. This study's objective is to determine if knowledge of load during elastic resistance exercise will increase strength gains during exercises. Participants were randomized into two strength training groups, elastic resistance only and elastic resistance using a load cell (LC) that displays force during exercise...
September 12, 2017: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/28922211/acute-effects-of-ammonia-inhalants-on-strength-and-power-performance-in-trained-men
#18
Sandro Bartolomei, Federico Nigro, Gubellini Luca, Semprini Gabriele, Simone Ciacci, Jay R Hoffman, Franco Merni
The aim of the present study was to investigate the influence of ammonia inhalants on lower body power and maximal isometric strength in trained men. Twenty experienced resistance trained men (age = 26.7 ± 3.7 y; body weight = 80.59 ± 9.0 kg; body height = 179.5 ± 5.7 cm) were tested for counter movement jump power (CMJP), maximal force and rate of force development (pRFD20) expressed during an isometric mid-thigh pull (IMTP). Assessments were performed using either an ammonia salt inhalants (AI), a placebo (PL) or no inhalants (N)...
September 12, 2017: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/28922049/magnitudes-of-muscle-activation-of-spine-stabilizers-in-healthy-adults-during-prone-on-elbow-planking-exercises-with-and-without-a-fitness-ball
#19
James W Youdas, Kendra C Coleman, Erin E Holstad, Stephanie D Long, Nicole L Veldkamp, John H Hollman
Prone planking exercises have been used by rehabilitation professionals to activate torso muscles in healthy persons and those with low back pain. The aim of this study was to compare the magnitude of electromyographic (EMG) muscle activation from 10 right-sided muscles as demonstrated by the percentage of maximum voluntary isometric contraction (%MVIC) during four planking procedures. Surface EMG activity was acquired from the following muscles: (1) iliocostalis lumborum (IL), (2) longissimus thoracis (LT), (3) lumbar multifidus (LM), (4) rectus abdominis (RA), (5) external oblique (EO), (6) internal oblique (IO), (7) serratus anterior (SA), (8) latissimus dorsi (LD), (9) hamstrings (HS), and (10) gluteus maximus (GM)...
September 18, 2017: Physiotherapy Theory and Practice
https://www.readbyqxmd.com/read/28918955/shifts-in-the-relationship-between-motor-unit-recruitment-thresholds-versus-derecruitment-thresholds-during-fatigue
#20
Matt S Stock, Jacob A Mota
Muscle fatigue is associated with diminished twitch force amplitude. We examined changes in the motor unit recruitment versus derecruitment threshold relationship during fatigue. Nine men (mean age = 26 years) performed repeated isometric contractions at 50% maximal voluntary contraction (MVC) knee extensor force until exhaustion. Surface electromyographic signals were detected from the vastus lateralis, and were decomposed into their constituent motor unit action potential trains. Motor unit recruitment and derecruitment thresholds and firing rates at recruitment and derecruitment were evaluated at the beginning, middle, and end of the protocol...
September 14, 2017: Medical Engineering & Physics
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