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https://www.readbyqxmd.com/read/28227269/effect-of-oral-glucose-supplementation-on-surface-emg-during-fatiguing-dynamic-exercise
#1
Clare M Davidson, Giuseppe De Vito, Madeleine M Lowery, Clare M Davidson, Giuseppe De Vito, Madeleine M Lowery, Madeleine M Lowery, Giuseppe De Vito, Clare M Davidson
The aim of this study was to examine the effect of oral glucose supplementation on the surface electromyographic (sEMG) signal recorded during a dynamic, fatiguing exercise protocol. Five healthy subjects participated in the study. Blood glucose concentration and sEMG signals from five upper leg muscles were recorded during a cycling exercise performed at 70% VO2peak until task failure, on two separate occasions. Glucose was consumed at 15 minute intervals throughout one trial. The median frequency of the sEMG was observed to increase progressively throughout the exercise, with a greater increase in the with glucose condition...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28219598/physical-activity-among-organ-recipients-data-collected-from-the-latin-american-transplant-games
#2
A N Atamañuk, J P Ortiz Fragola, M Casonu, C Lirio, V Graziano, F Cicora
BACKGROUND: Cardiovascular complications after transplantation are an important cause of non-transplant-related deaths. Depression and anxiety are not unusual among organ recipients. Physical activity reduces cardiovascular risk and promotes a sensation of well-being. The aims of the study were to examine how exercise affects psychological well-being sensation in organ recipients and to describe the physician's role in promoting and controlling safe sport training in transplanted patients...
March 2017: Transplantation Proceedings
https://www.readbyqxmd.com/read/28217415/muscle-activation-patterns-during-suspension-training-exercises
#3
Sean Harris, Elise Ruffin, Wayne Brewer, Alexis Ortiz
BACKGROUND: Suspension training (ST) has been utilized over exercises performed on a stable surface to train multiple muscle groups simultaneously to increase muscle activation and joint stability. HYPOTHESIS/PURPOSE: The purpose of this study was to determine whether ST augments muscle activation compared to similar exercises performed on a stable surface. STUDY DESIGN: Cross-sectional study. METHODS: Twenty-five healthy adults (male: 16; women: 9; BMI: 23...
February 2017: International Journal of Sports Physical Therapy
https://www.readbyqxmd.com/read/28217412/exercises-that-facilitate-optimal-hamstring-and-quadriceps-co-activation-to-help-decrease-acl-injury-risk-in-healthy-females-a-systematic-review-of-the-literature
#4
Rachel Dedinsky, Lindsey Baker, Samuel Imbus, Melissa Bowman, Leigh Murray
BACKGROUND: Anterior cruciate ligament (ACL) injury is common among females due to many anatomic, hormonal, and neuromuscular risk factors. One modifiable risk factor that places females at increased risk of ACL injury is a poor hamstrings: quadriceps (H:Q) co-activation ratio, which should be 0.6 or greater in order to decrease the stress placed on the ACL. Exercises that produce more quadriceps dominant muscle activation can add to the tension placed upon the ACL, potentially increasing the risk of ACL injury...
February 2017: International Journal of Sports Physical Therapy
https://www.readbyqxmd.com/read/28210036/a-study-on-muscle-activity-and-ratio-of-the-knee-extensor-depending-on-the-types-of-squat-exercise
#5
Jeong-Il Kang, Joon-Su Park, Hyun Choi, Dae-Keun Jeong, Hye-Min Kwon, Young-Jun Moon
[Purpose] For preventing the patellofemoral pain syndrome, this study aims to suggest a proper squat method, which presents selective muscle activity of Vastus Medialis Oblique and muscle activity ratios of Vastus Medialis Oblique/Vastus Lateralis by applying squat that is a representative weight bearing exercise method in various ways depending on the surface conditions and knee bending angles. [Subjects and Methods] An isometric squat that was accompanied by hip adduction, depending on the surface condition and the knee joint flexion angle, was performed by 24 healthy students...
January 2017: Journal of Physical Therapy Science
https://www.readbyqxmd.com/read/28209743/skeletal-muscle-bioenergetics-during-all-out-exercise-mechanistic-insight-into-the-oxygen-uptake-slow-component-and-neuromuscular-fatigue
#6
Ryan M Broxterman, Gwenael Layec, Thomas J Hureau, Markus Amann, Russell S Richardson
Although commonly used, the physiological mechanisms underlying all-out exercise performance are still unclear and an in-depth assessment of skeletal muscle bioenergetics is lacking. Therefore, phosphorous magnetic resonance spectroscopy ((31)P-MRS) was utilized to assess skeletal muscle bioenergetics during a 5-min all-out intermittent isometric knee-extensor protocol in 8 healthy men. The metabolic perturbation, adenosine triphosphate (ATP) synthesis rates, ATP cost of contraction, and mitochondrial capacity were determined from intramuscular concentrations of phosphocreatine (PCr), inorganic phosphate (Pi), diprotonated phosphate (H2PO4⁻ ), and pH...
February 16, 2017: Journal of Applied Physiology
https://www.readbyqxmd.com/read/28204862/effect-of-constant-predictable-and-unpredictable-motor-tasks-on-motor-performance-and-blood-markers-of-stress
#7
Laura Kyguoliene, Albertas Skurvydas, Nerijus Eimantas, Neringa Baranauskienė, Dalia Mickeviciene, Daiva Urboniene, Margarita Cernych, Marius Brazaitis
An unfamiliar or novel physical stimulus induces activation of dopaminergic neurons within the brain and greater activity in areas involved in emotion; considering this, we aimed to establish whether unpredictable prolonged (fatiguing) motor task (vs. constant vs. predictable) evokes greater dopaminergic activity, enhances neuromuscular performance, motor accuracy, and perception of effort, and delays overall central fatigue. Fifteen healthy male volunteers (aged 22 ± 4 years) were required to perform 1 of 3 exercise trials (at least 1 week apart) of 100 intermittent isometric contraction (IIC) tasks involving knee extensions at 60° flexion...
February 16, 2017: Experimental Brain Research. Experimentelle Hirnforschung. Expérimentation Cérébrale
https://www.readbyqxmd.com/read/28198605/the-effect-of-gymnastic-training-on-muscle-strength-and-co-activation-during-isometric-elbow-and-glenohumeral-flexion-extension
#8
Andrzej Kochanowicz, Bartłomiej Niespodziński, Jan Mieszkowski, Kazimierz Kochanowicz, Stanisław Sawczyn
BACKGROUND: The purpose of the study was to demonstrate the differences between non- athletes and gymnasts at the pre- and post-pubertal age in the development of peak torque and ensuing flexion/extension ratios at the elbow and the glenohumeral joints, as well as to assess the relevance of the above activities for the co-activation of selected muscles. METHODS: The study involved 20 gymnasts and 20 non-athletes aged 8-9 years, in addition to 12 gymnasts and 16 non-athletes aged 18-25 years...
February 14, 2017: Journal of Sports Medicine and Physical Fitness
https://www.readbyqxmd.com/read/28198602/the-profile-of-upper-extremity-muscular-strength-in-female-wheelchair-basketball-players-a-pilot-study
#9
Bahar Külünkoğlu, Yasemin Akkubak, Nevin Ergun
BACKGROUND: The purpose of this study was to analyze and compare the profile of upper extremity muscle strength in female wheelchair basketball players with that of sex-matched non-disabled controls. METHODS: Nineteen female subjects were enrolled in this study. These were divided into two groups. Group 1 (n=10) consisted of wheelchair basketball players and Group 2 (n=9) of non-disabled individuals. Muscular strength in the shoulder was measured using an isokinetic dynamometer...
February 14, 2017: Journal of Sports Medicine and Physical Fitness
https://www.readbyqxmd.com/read/28192854/ingestion-of-trp-channel-agonists-attenuates-exercise-induced-muscle-cramps
#10
Daniel H Craighead, Sean W Shank, Jinger S Gottschall, Dennis H Passe, Bob Murray, Lacy M Alexander, W Larry Kenney
: Exercise associated muscle cramping (EAMC) is a poorly understood problem that is neuromuscular in origin. Ingestion of transient receptor potential (TRP) channel agonists has been efficacious in attenuating electrically-induced muscle cramps. PURPOSE: To examine the effect of TRP agonist ingestion on voluntarily-induced EAMC and motor function. METHODS: Study 1: 39 subjects completed 2 trials after ingesting TRP agonist-containing active treatment (A), or vehicle (V) control...
February 13, 2017: Muscle & Nerve
https://www.readbyqxmd.com/read/28183862/the-mechanisms-underlying-the-muscle-metaboreflex-modulation-of-sweating-and-cutaneous-blood-flow-in-passively-heated-humans
#11
Baies Haqani, Naoto Fujii, Narihiko Kondo, Glen P Kenny
Metaboreceptors can modulate cutaneous blood flow and sweating during heat stress but the mechanisms remain unknown. Fourteen participants (31 ± 13 years) performed 1-min bout of isometric handgrip (IHG) exercise at 60% of their maximal voluntary contraction followed by a 3-min occlusion (OCC), each separated by 10 min, initially under low (LHS, to activate sweating without changes in core temperature) and high (HHS, whole-body heating to a core temperature increase of 1.0°C) heat stress conditions. Cutaneous vascular conductance (CVC) and sweat rate were measured continuously at four forearm skin sites perfused with 1) lactated Ringer's solution (Control), 2) 10 mmol L-NAME [inhibits nitric oxide synthase (NOS)], 3) 10 mmol Ketorolac [inhibits cyclooxygenase (COX)], or 4) 4 mmol theophylline (THEO; inhibits adenosine receptors)...
February 2017: Physiological Reports
https://www.readbyqxmd.com/read/28177751/evidence-of-nonlocal-muscle-fatigue-in-male-youth
#12
Aymen Ben Othman, Anis Chaouachi, Mehdi M Chaouachi, Raouf Hammami, Sofien Kasmi, David G Behm
Evidence for nonlocal muscle fatigue (NLMF) has been inconsistent in adults, with no studies investigating youth. The objective was to examine NLMF in youth. Forty-two young males (age, 10-13 years) were tested for maximal voluntary isometric contraction (MVIC) force of the ipsilateral and contralateral knee extensors at 90° and 120° knee flexion, elbow flexors at 90°, handgrip, knee extensor isokinetic torque (300(o)·s(-1) analyzed at 90(o) and 120(o) knee flexion), as well as a unilateral countermovement jump (CMJ) and Y Balance test (YBT)...
November 2, 2016: Applied Physiology, Nutrition, and Metabolism, Physiologie Appliquée, Nutrition et Métabolisme
https://www.readbyqxmd.com/read/28177706/the-effects-of-acute-branched-chain-amino-acid-supplementation-on-recovery-from-a-single-bout-of-hypertrophy-exercise-in-resistance-trained-athletes
#13
Mark Waldron, Kieran Whelan, Owen Jeffries, Dean Burt, Louis Howe, Stephen David Patterson
This study investigated the effects of acute branched-chain amino acid (BCAA) supplementation on recovery from exercise-induced muscle damage, among experienced resistance-trained athletes. In a double-blind matched-pairs design, 16 resistance-trained participants, routinely performing hypertrophy training, were randomly assigned to a BCAA (n = 8) or placebo (n = 8) group. The BCAAs were administered at a dosage of 0.087 g/kg body mass, with a 2:1:1 ratio of leucine, isoleucine and valine. The participants performed 6 sets of 10 full-squats at 70 % 1RM to induce muscle damage...
January 27, 2017: Applied Physiology, Nutrition, and Metabolism, Physiologie Appliquée, Nutrition et Métabolisme
https://www.readbyqxmd.com/read/28171779/trunk-muscle-activity-during-different-variations-of-the-supine-plank-exercise
#14
Joaquin Calatayud, Jose Casaña, Fernando Martín, Markus D Jakobsen, Juan C Colado, Pedro Gargallo, Álvaro Juesas, Víctor Muñoz, Lars L Andersen
BACKGROUND: Exercises providing neuromuscular challenges of the spinal muscles are desired for core stability, which is important for workers with heavy manual labour as well as people recovering from back pain. PURPOSE: This study evaluated whether using a suspended modality increases trunk muscle activity during unilateral or bilateral isometric supine planks. DESIGN: Cross-sectional. METHODS: Twenty university students participated in this cross-sectional study...
January 31, 2017: Musculoskelet Sci Pract
https://www.readbyqxmd.com/read/28168554/effectiveness-of-using-wearable-vibration-therapy-to-alleviate-muscle-soreness
#15
Darryl J Cochrane
PURPOSE: To examine the acute and short-term effect of a wearable vibration device following strenuous eccentric exercise of the elbow flexors. METHODS: Physically active males (n = 13) performed vibration therapy (VT) and control following eccentric exercise. The arms were randomised and counterbalanced, separated by 14 days. 15 min of VT (120 Hz) was applied immediately and 24, 48, and 72 h after eccentric exercise while the contralateral arm performed no VT (control)...
February 6, 2017: European Journal of Applied Physiology
https://www.readbyqxmd.com/read/28167183/foot-exercise-and-taping-in-patients-with-patellofemoral-pain-and-pronated-foot
#16
Jihyun Lee, Jangwhon Yoon, Heonseock Cynn
This study compared the effect of three foot conditions (untreated, short foot [SF] exercise, and Tape) on knee and ankle muscle activity during forward descending of stairs in subjects with patellofemoral pain syndrome (PFPS) and a pronated foot. Surface electromyography activities in the vastus medialis oblique (VMO), vastus lateralis (VL), and abductor hallucis (AbdH) were recorded during forward descending stairs; Surface electromyography data were expressed as percentages of the maximal voluntary isometric contraction...
January 2017: Journal of Bodywork and Movement Therapies
https://www.readbyqxmd.com/read/28167168/effects-of-a-16-week-pilates-exercises-training-program-for-isometric-trunk-extension-and-flexion-strength
#17
Irina Kliziene, Saule Sipaviciene, Jovita Vilkiene, Audrone Astrauskiene, Gintautas Cibulskas, Sarunas Klizas, Ginas Cizauskas
OBJECTIVE: To evaluate the effects of Pilates exercises designed to improve isometric trunk extension and flexion strength of muscles in women with chronic low back pain (cLBP). PARTICIPANTS: Female volunteers with cLBP were divided into an experimental group (EG; n = 27) and a control group (CG; n = 27). INTERVENTION: Pilates exercises were performed twice per week by the EG; the duration of each session was 60 min. The program lasted for 16 weeks; thus patients underwent a total of 32 exercise sessions...
January 2017: Journal of Bodywork and Movement Therapies
https://www.readbyqxmd.com/read/28165870/a-comparison-of-exercise-induced-muscle-damage-following-maximal-eccentric-contractions-in-men-and-boys
#18
Chariklia K Deli, Ioannis G Fatouros, Vassilis Paschalis, Kalliopi Georgakouli, Athanasios Zalavras, Alexandra Avloniti, Yiannis Koutedakis, Athanasios Z Jamurtas
PURPOSE: Research regarding exercise-induced muscle-damage mainly focuses on adults. The present study examined exercise-induced muscle-damage responses in adults compared to children. METHOD: Eleven healthy boys (10-12y) and 15 healthy men (18-45y) performed 5 sets of 15 maximal eccentric contractions of the knee extensors. Range of motion (ROM), delayed onset muscle soreness (DOMS) during squat and walking, and peak isometric, concentric and eccentric torque were assessed before, post-, 24, 48, 72, and 96h post-exercise...
February 6, 2017: Pediatric Exercise Science
https://www.readbyqxmd.com/read/28160085/transcutaneous-electrical-nerve-stimulation-reduces-exercise-induced-perceived-pain-and-improves-endurance-exercise-performance
#19
Ali H Y Astokorki, Alexis R Mauger
PURPOSE: Muscle pain is a natural consequence of intense and prolonged exercise and has been suggested to be a limiter of performance. Transcutaneous electrical nerve stimulation (TENS) and interferential current (IFC) have been shown to reduce both chronic and acute pain in a variety of conditions. This study sought to ascertain whether TENS and IFC could reduce exercise-induced pain (EIP) and whether this would affect exercise performance. It was hypothesised that TENS and IFC would reduce EIP and result in an improved exercise performance...
February 3, 2017: European Journal of Applied Physiology
https://www.readbyqxmd.com/read/28160082/periodization-effects-during-short-term-resistance-training-with-equated-exercise-variables-in-females
#20
Thiemo Pelzer, Boris Ullrich, Mark Pfeiffer
PURPOSE: During resistance training, volume and load can be altered either gradually (traditional periodization: TP) or with frequent changes between subsequent sessions (daily undulating periodization: DUP). We hypothesized that the periodization model employed would not impact upon training-induced adaptations when exercise variables are equated. METHODS: Nineteen females (22.0 years, moderate resistance training experience of 27.9 months) performed 6 weeks of knee extensor training with 3 weekly sessions exercising one leg using TP and the contralateral leg using DUP...
February 3, 2017: European Journal of Applied Physiology
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