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https://www.readbyqxmd.com/read/29651252/intra-session-and-inter-day-reliability-of-the-myon-320-electromyography-system-during-sub-maximal-contractions
#1
Graeme G Sorbie, Michael J Williams, David W Boyle, Alexander Gray, James Brouner, Neil Gibson, Julien S Baker, Chris Easton, Ukadike C Ugbolue
Electromyography systems are widely used within the field of scientific and clinical practices. The reliability of these systems are paramount when conducting research. The reliability of Myon 320 Surface Electromyography System is yet to be determined. This study aims to determine the intra-session and inter-day reliability of the Myon 320 Surface Electromyography System. Muscle activity from fifteen participants was measured at the anterior deltoid muscle during a bilateral front raise exercise, the vastus lateralis muscle during a squat exercise and the extensor carpi radialis brevis (ECRB) muscle during an isometric handgrip task...
2018: Frontiers in Physiology
https://www.readbyqxmd.com/read/29644392/effect-of-a-rest-pause-vs-traditional-squat-on-electromyography-and-lifting-volume-in-trained-women
#2
John A Korak, Max R Paquette, Dana K Fuller, Jennifer L Caputo, John M Coons
PURPOSE: Rest-pause (4 s unloaded rest between repetitions) single session training effects on lifting volume, and muscle activity via electromyography (EMG) are currently vague in the literature and can benefit strength and conditioning professionals for resistance training program design. This study compared differences in volume lifted and muscle activity between a rest-pause vs. traditional protocol. METHODS: Trained females (N = 13) completed both a rest-pause and traditional squat protocol consisting of four sets to movement failure at 80% pretest 1 repetition maximum load with 2-min rest between sets...
April 11, 2018: European Journal of Applied Physiology
https://www.readbyqxmd.com/read/29629620/differential-training-loads-and-individual-fitness-responses-to-pre-season-in-professional-rugby-union-players
#3
Shaun J McLaren, Andrew Smith, Jonathan D Bartlett, Iain R Spears, Matthew Weston
We aimed to compare differentiated training loads (TL) between fitness responders and non-responders to an eight-week pre-season training period in a squad of thirty-five professional rugby union players. Differential TL were calculated by multiplying player's perceptions of breathlessness (sRPE-B) and leg muscle exertion (sRPE-L) with training duration for each completed session. Performance-based fitness measures included the Yo-Yo Intermittent Recovery Test Level 1 (YYIRTL1), 10-, 20-, and 30-m linear sprint times, countermovement jump height (CMJ) and predicted one-repetition maximum back squat (P1RM Squat)...
April 9, 2018: Journal of Sports Sciences
https://www.readbyqxmd.com/read/29628895/rpe-vs-percentage-1rm-loading-in-periodized-programs-matched-for-sets-and-repetitions
#4
Eric R Helms, Ryan K Byrnes, Daniel M Cooke, Michael H Haischer, Joseph P Carzoli, Trevor K Johnson, Matthew R Cross, John B Cronin, Adam G Storey, Michael C Zourdos
Purpose: To investigate differences between rating of perceived exertion (RPE) and percentage one-repetition maximum (1RM) load assignment in resistance-trained males (19-35 years) performing protocols with matched sets and repetitions differentiated by load-assignment. Methods: Participants performed squats then bench press 3x/weeks in a daily undulating format over 8-weeks. Participants were counterbalanced by pre-test 1RM then assigned to percentage 1RM (1RMG, n = 11); load-assignment via percentage 1RMs, or RPE groups (RPEG, n = 10); participant-selected loads to reach target RPE ranges...
2018: Frontiers in Physiology
https://www.readbyqxmd.com/read/29628803/lower-body-strength-training-versus-proprioceptive-exercises-on-vertical-jump-capacity-a-feasibility-study
#5
Charles Son, Adam Stewart, John Ward, Kimary Farrar
Objective: The purpose of this study was to test the feasibility of completing a study comparing the impact of lower body strength training to proprioceptive exercises on vertical jump capacity. Methods: Thirty-nine college students (age 27.9 ± 6.4 y, height 1.69 ± 0.10 m, body mass 73.4 ± 15.9 kg: mean ± standard deviation) underwent baseline and post-testing of their vertical jump capacity using a Vertical Challenger and VICON motion analysis system. Participants were randomly assigned to 3 interventional groups between testing sessions: (1) lower body strength training, (2) lower body proprioceptive training, and (3) a no training control...
March 2018: Journal of Chiropractic Medicine
https://www.readbyqxmd.com/read/29626617/dynamic-sonographic-visualization-of-an-occult-posterior-lateral-meniscocapsular-separation-a-case-report
#6
Allison Schroeder, Volker Musahl, Christopher Urbanek, Kentaro Onishi
Meniscocapsular separation describes detachment of the meniscus from the knee joint capsule. Diagnosis is challenging with conventional examination and imaging methods. We report a case of an 18-year-old female softball catcher with unrevealing MRI despite continued left knee locking and discomfort with deep squatting. Meniscocapsular separation was revealed only on dynamic sonographic exam, where knee flexion revealed a 3.1 mm gap that developed between the capsule and peripheral meniscus. Arthroscopy confirmed the sonographic findings, and repair resulted in complete resolution of symptoms...
April 4, 2018: PM & R: the Journal of Injury, Function, and Rehabilitation
https://www.readbyqxmd.com/read/29625360/correlation-between-quadriceps-and-hamstrings-inter-limb-strength-asymmetry-with-change-of-direction-and-sprint-in-u21-elite-soccer-players
#7
Giuseppe Coratella, Marco Beato, Federico Schena
The aim of this study was to investigate the relationship between in quadriceps and hamstrings inter-limb strength asymmetry and change of direction, sprinting and jumping abilities in U21 elite soccer players. Twenty-seven soccer players volunteered for this study. Isokinetic quadriceps and hamstrings peak torque was measured at high and low angular velocities, both in concentric and eccentric modalities. Performance in agility T-test, 20 + 20 m shuttle-test, 10 m and 30 m sprint, squat jump (SJ) and counter-movement jump (CMJ), were measured...
April 3, 2018: Human Movement Science
https://www.readbyqxmd.com/read/29623377/the-increase-in-posterior-tibial-slope-provides-a-positive-biomechanical-effect-in-posterior-stabilized-total-knee-arthroplasty
#8
Kyoung-Tak Kang, Sae Kwang Kwon, Juhyun Son, Oh-Ryong Kwon, Jun-Sang Lee, Yong-Gon Koh
PURPOSE: This study aims to clarify the influence of the posterior tibial slope (PTS) on knee joint biomechanics after posterior-stabilized (PS) total knee arthroplasty (TKA) using a computer simulation. METHODS: A validated TKA computational model was used to evaluate and quantify the effects of an increased PTS. In order to conduct a squat simulation, models with a - 3° to 15° PTS using increments of 3° were developed. Forces on the quadriceps and collateral ligament, a tibial posterior translation, contact point on a polyethylene (PE) insert, and contact stress on the patellofemoral (PF) joint and post in a PE insert were compared...
April 5, 2018: Knee Surgery, Sports Traumatology, Arthroscopy: Official Journal of the ESSKA
https://www.readbyqxmd.com/read/29623234/the-positive-benefits-of-negative-movement-patterns-following-total-knee-arthroplasty
#9
Jesse C Christensen, K Bo Foreman, Paul C LaStayo
Introduction: Eccentric (negative) resistance exercise of the legs using specialized machines has been reported to be useful and often superior to standard exercise following total knee arthroplasty (TKA). Movements that utilize body mass and gravity as a mode of eccentric resistance exercise in a more pragmatic rehabilitation paradigm may also be useful in reversing chronic muscle impairments observed years following surgery. This study explores whether an eccentrically biased, body mass resistance exercise induces greater magnitude of sagittal plane extensor angular impulse of the support torque and individual net joint torque contributions during both squatting and lunging movement patterns 6 weeks following TKA...
2018: Geriatric Orthopaedic Surgery & Rehabilitation
https://www.readbyqxmd.com/read/29621305/biomarkers-associated-with-low-moderate-and-high-vastus-lateralis-muscle-hypertrophy-following-12-weeks-of-resistance-training
#10
Christopher B Mobley, Cody T Haun, Paul A Roberson, Petey W Mumford, Wesley C Kephart, Matthew A Romero, Shelby C Osburn, Christopher G Vann, Kaelin C Young, Darren T Beck, Jeffrey S Martin, Christopher M Lockwood, Michael D Roberts
We sought to identify biomarkers which delineated individual hypertrophic responses to resistance training. Untrained, college-aged males engaged in full-body resistance training (3 d/wk) for 12 weeks. Body composition via dual x-ray absorptiometry (DXA), vastus lateralis (VL) thickness via ultrasound, blood, VL muscle biopsies, and three-repetition maximum (3-RM) squat strength were obtained prior to (PRE) and following (POST) 12 weeks of training. K-means cluster analysis based on VL thickness changes identified LOW [n = 17; change (mean±SD) = +0...
2018: PloS One
https://www.readbyqxmd.com/read/29600837/the-effects-of-functional-and-traditional-strength-training-on-different-parameters-of-strength-elderly-women-a-trial-randomized-and-controlled
#11
José C Aragão-Santos, Antônio G de Resende-Neto, Albernon Costa Nogueira, M Lourdes Feitosa-Neta, Leandro H Albuquerque Brandão, Leury M da Silva Chaves, Marzo E da Silva-Grigoletto
BACKGROUND: Physical exercise is the main strategy for improving physical fitness in elderly population. However, it is not clear which training method lead to greater adaptations on maximal dynamic strength, muscle power, muscle endurance and isometric strength in this population. Thus, our aim was to compare the effects of functional and traditional training on these variables in the elderly. METHODS: This study lasted twelve weeks, where forty-four elderly women were randomly divided into three groups: Functional (FT; n = 18); Traditional (TT; n = 15); and Control (CG; n = 11)...
March 30, 2018: Journal of Sports Medicine and Physical Fitness
https://www.readbyqxmd.com/read/29599871/effects-of-different-post-activation-potentiation-warm-ups-on-repeated-sprint-ability-in-soccer-players-from-different-competitive-levels
#12
Javier Sanchez-Sanchez, Alejandro Rodriguez, Cristina Petisco, Rodrigo Ramirez-Campillo, Cristian Martínez, Fábio Y Nakamura
This study aimed to compare the effects of a traditional warm-up with two post-activation potentiation (PAP) warm-up strategies on the repeated sprint ability (RSA) of soccer players from national (NL) and regional (RL) competitive levels. Sixteen young players (NL, n = 8, age = 20.7 ± 1.4 y, body mass = 68.5 ± 7.0 kg, body height = 177.4 ± 5.2 cm; RL, n = 8, age = 20.8 ± 1.0 y, body mass = 68.7 ± 4.0 kg, body height = 176.6 ± 5.6 cm) were recruited to complete a traditional warm-up (CONTROL), a PAP warm-up incorporating squats with a load (~60% 1RM) that allowed a high speed (1 m/s) of movement and a high number of repetitions (PAP-1), and a PAP warm-up with a load (~90% 1RM) that allowed a moderate speed (0...
March 2018: Journal of Human Kinetics
https://www.readbyqxmd.com/read/29599856/influence-of-dynamic-neuromuscular-stabilization-approach-on-maximum-kayak-paddling-force
#13
Pavel Davidek, Ross Andel, Alena Kobesova
The purpose of this study was to examine the effect of Dynamic Neuromuscular Stabilization (DNS) exercise on maximum paddling force (PF) and self-reported pain perception in the shoulder girdle area in flatwater kayakers. Twenty male flatwater kayakers from a local club (age = 21.9 ± 2.4 years, body height = 185.1 ± 7.9 cm, body mass = 83.9 ± 9.1 kg) were randomly assigned to the intervention or control groups. During the 6-week study, subjects from both groups performed standard off-season training. Additionally, the intervention group engaged in a DNS-based core stabilization exercise program (quadruped exercise, side sitting exercise, sitting exercise and squat exercise) after each standard training session...
March 2018: Journal of Human Kinetics
https://www.readbyqxmd.com/read/29599693/functional-analysis-of-lower-limbs-in-individuals-infected-with-the-human-immunodeficiency-virus
#14
Gabriel Pádua da Silva, Bruno Ferreira, Selma Siéssere, Isabela Hallak Regalo, Danilo Stefani Esposto, Camila Roza Gonçalves, Veridiana Wanshi Arnoni, Edson Donizetti Verri, Paulo Batista Vasconcelos, Maria Aparecida Carneiro Vasconcelos, Alcyone Artioli Machado, Simone Cecilio Hallak Regalo
Objectives: The objective of this research was to analyze the functional changes of lower limbs by means of surface electromyography in patients with acquired immunodeficiency syndrome. Methods: A total of 60 men and women (age mean of 36.77 ± 9.33 years) were divided into two groups: 30 individuals with human immunodeficiency virus group (HIVG) Subtype 1 and 30 healthy individuals control group. Muscle activity was evaluated using surface electromyography (sEMG)...
March 2018: International Journal of Health Sciences
https://www.readbyqxmd.com/read/29590139/the-effects-of-unilateral-and-bilateral-eccentric-overload-training-on-hypertrophy-muscle-power-and-cod-performance-and-its-determinants-in-team-sport-players
#15
Francisco Javier Núñez, Alfredo Santalla, Irene Carrasquila, Jose Antonio Asian, Jose Ignacio Reina, Luis Jesús Suarez-Arrones
The study aimed to compare the chronic eccentric-overload training effects of unilateral (lateral lunge) vs bilateral (half-squat) using an inertial device, on hypertrophy and physical performance. Twenty-seven young team sports male players performed a 4 sets of 7 repetitions of inertial eccentric overload training, biweekly for 6 weeks, distributed in unilateral lunge group (UG: age: 22.8 ± 2.9 years; body mass: 75.3 ± 8.8 kg; height: 177.3 ± 3.7 cm) and bilateral squat group (BG: age: 22.6 ± 2.7 years; body mass: 79...
2018: PloS One
https://www.readbyqxmd.com/read/29589507/development-content-validity-and-test-retest-reliability-of-the-lifelong-physical-activity-skills-battery-in-adolescents
#16
Ryan M Hulteen, Lisa M Barnett, Philip J Morgan, Leah E Robinson, Christian J Barton, Brian H Wrotniak, David R Lubans
Numerous skill batteries assess fundamental motor skill (e.g., kick, hop) competence. Few skill batteries examine lifelong physical activity skill competence (e.g., resistance training). This study aimed to develop and assess the content validity, test-retest and inter-rater reliability of the "Lifelong Physical Activity Skills Battery". Development of the skill battery occurred in three stages: i) systematic reviews of lifelong physical activity participation rates and existing motor skill assessment tools, ii) practitioner consultation and iii) research expert consultation...
March 28, 2018: Journal of Sports Sciences
https://www.readbyqxmd.com/read/29588022/use-of-whole-body-vibration-in-individuals-with-chronic-stroke-transmissibility-and-signal-purity
#17
Meizhen Huang, Chak-Yin Tang, Marco Y C Pang
This study examined (1) the influence of whole body vibration (WBV) frequency (20 Hz, 30 Hz, 40 Hz), amplitude (low: 0.8 mm and high: 1.5 mm) and body postures (high-squat, deep-squat, tip-toe standing) on WBV transmissibility and signal purity, and (2) the relationship between stroke motor impairment and WBV transmissibility/signal purity. Thirty-four participants with chronic stroke were tested under 18 different conditions with unique combinations of WBV frequency, amplitude, and body posture. Lower limb motor function and muscle spasticity were assessed using the Fugl-Meyer Assessment and Modified Ashworth Scale respectively...
March 17, 2018: Journal of Biomechanics
https://www.readbyqxmd.com/read/29584533/rehabilitation-exercises-for-the-gluteus-minimus-muscle-segments-an-electromyography-study
#18
Damien Moore, Adam I Semciw, Jodie McClelland, Henry Wajswelner, Tania Pizzari
CONTEXT: The gluteus minimus (GMin) muscle consists of two uniquely oriented segments that have potential for independent function, and have different responses to pathology and ageing. For healthy, young adults it is unknown which rehabilitation exercises specifically target the individual segments. OBJECTIVE: To quantify segmental GMin activity for six common lower limb rehabilitation exercises in healthy young adults, and determine if significant differences exist in segmental activity levels between the exercises...
March 27, 2018: Journal of Sport Rehabilitation
https://www.readbyqxmd.com/read/29581666/lumbar-lordosis-angle-and-trunk-and-lower-limb-electromyographic-activity-comparison-in-hip-neutral-position-and-external-rotation-during-back-squats
#19
Tomoki Oshikawa, Yasuhiro Morimoto, Koji Kaneoka
[Purpose] To compare the lumbar lordosis angle and electromyographic activities of the trunk and lower-limb muscles in the hip neutral position and external rotation during back squats. [Subjects and Methods] Ten healthy males without severe low back pain or lower-limb injury participated in this study. The lumbar lordosis angle and electromyographic activities were measured using three-dimensional motion-capture systems and surface electrodes during four back squats: parallel back squats in the hip neutral position and external rotation and full back squats in the hip neutral position and external rotation...
March 2018: Journal of Physical Therapy Science
https://www.readbyqxmd.com/read/29581655/effect-of-squatting-velocity-on-hip-muscle-latency-in-women-with-patellofemoral-pain-syndrome
#20
Ignacio Orozco-Chavez, Guillermo Mendez-Rebolledo
[Purpose] Neuromuscular activity has been evaluated in patellofemoral pain syndrome but movement velocity has not been considered. The aim was to determine differences in onset latency of hip and knee muscles between individuals with and without patellofemoral pain syndrome during a single leg squat, and whether any differences are dependent on movement velocity. [Subjects and Methods] Twenty-four females with patellofemoral pain syndrome and 24 healthy females participated. Onset latency of gluteus maximus, anterior and posterior gluteus medius, rectus femoris, vastus medialis, vastus lateralis and biceps femoris during a single leg squat at high and low velocity were evaluated...
March 2018: Journal of Physical Therapy Science
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