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https://www.readbyqxmd.com/read/28214295/blood-flow-restriction-increases-metabolic-stress-but-decreases-muscle-activation-during-high-load-resistance-exercise
#1
Emerson L Teixeira, Renato Barroso, Carla Silva-Batista, Gilberto C Laurentino, Jeremy P Loenneke, Hamilton Roschel, Carlos Ugrinowitsch, Valmor Tricoli
INTRODUCTION: We investigated differences in metabolic stress (lactate) and muscle activation (electromyography) when high load exercise is compared to a condition where blood flow restriction (BFR) is applied during the exercise or during the rest interval. METHODS: Twelve participants performed high load resistance exercise with BFR during the intervals (BFR-I), during the set (BFR-S) and without BFR (HL). Each condition consisted of 3 sets of 8 repetitions with knee-extension at 70% of one-repetition-maximum...
February 18, 2017: Muscle & Nerve
https://www.readbyqxmd.com/read/28210036/a-study-on-muscle-activity-and-ratio-of-the-knee-extensor-depending-on-the-types-of-squat-exercise
#2
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/28205417/muscle-activation-and-heart-rate-responses-to-a-side-step-interval-exercise
#3
Robert S Thiebaud, Takashi Abe, Jonathan C Bravo, Nicolas Giovannitti, Avery P Sullivan
BACKGROUND: The side-step test is commonly used to assess agility. Side-step interval exercise may also be a potential way to improve cardiorespiratory and muscular fitness. However, the acute heart rate and muscle activation response to this type of exercise is not well established. In addition, different tempos can influence these responses. The purpose of this study was to determine the acute heart rate and muscle activation responses of a side-step interval exercise to different exercise tempos...
February 16, 2017: Clinical Physiology and Functional Imaging
https://www.readbyqxmd.com/read/28205264/the-influence-of-patellar-tendon-and-muscle-tendon-unit-stiffness-on-quadriceps-explosive-strength-in-man
#4
Garry J Massey, Thomas G Balshaw, Thomas M Maden-Wilkinson, Neale A Tillin, Jonathan P Folland
The influence of musculotendinous tissue stiffness on contractile rate of torque development (RTD) remains opaque. This study examined the relationships between both patellar tendon (PT) and vastus lateralis (VL) muscle-tendon unit (MTU) stiffness, and voluntary and evoked knee extension RTD. Fifty-two healthy untrained males completed duplicate laboratory sessions. Absolute and relative RTD was measured at 50 Nm/25%MVT increments from onset and sequentially during explosive voluntary and evoked octet (supramaximal stimulation: [8 pulses at 300 Hz]) isometric contractions...
February 15, 2017: Experimental Physiology
https://www.readbyqxmd.com/read/28202082/bone-morphogenetic-proteins-and-myostatin-pathways-key-mediator-of-human-sarcopenia
#5
Manuel Scimeca, Eleonora Piccirilli, Francesca Mastrangeli, Cecilia Rao, Maurizio Feola, Augusto Orlandi, Elena Gasbarra, Elena Bonanno, Umberto Tarantino
BACKGROUND: Sarcopenia, osteoporosis and osteoarthritis are the most frequent musculoskeletal disorders affecting older people. The main aim of this study was to test the hypothesis that the balance between BMPs and myostatin pathways regulates the age-related muscle degeneration in OP and OA patients. To this end, we investigated the relationship among the expression of BMP-2/4-7, myostatin and phosphorylated Smads1-5-8 and the muscle quality, evaluated in term of fibers atrophy and satellite cells activity...
February 15, 2017: Journal of Translational Medicine
https://www.readbyqxmd.com/read/28199786/alpha-adrenergic-receptor-blockade-increases-capillarisation-and-fractional-o2-extraction-and-lowers-blood-flow-in-contracting-human-skeletal-muscle
#6
Stefan P Mortensen, Stuart Egginton, Mads Madsen, Jonas B Hansen, Gregers D W Munch, Ulrik Winning Iepsen, Thorbjörn Åkerström, Bente K Pedersen, Ylva Hellsten
AIM: To investigate the effect of elevated basal shear stress on angiogenesis in humans, and the role of enhanced skeletal muscle capillarisation on blood flow and O2 extraction. METHODS: Limb haemodynamics and O2 extraction was measured at rest and during one-leg knee-extensor exercise (12 and 24W) in 10 healthy untrained young men before and after 4 weeks treatment with an α1 receptor-antagonist (Terazosin, 1-2 mg day(-1) ). Corresponding biopsies were taken from the m...
February 15, 2017: Acta Physiologica
https://www.readbyqxmd.com/read/28198601/the-effect-of-high-speed-strength-training-with-heavy-and-low-workloads-on-neuromuscular-function-and-maximal-concentric-quadriceps-strength
#7
Ali A Mazani, Mohamed R Hamdinia, Amir H Haghigi, Nosratollah Hedayatpour
BACKGROUND: Dynamic strength training has been widely used to increase the ability of skeletal muscle to produce muscle force. Manipulating resistance training program variables has been commonly used as a tool to optimize maximum strength. This study examined the effects of 12 weeks of high-speed strength training with low and heavy workloads on muscle strength and neuromuscular function of quadriceps muscle. METHODS: Thirty male subjects (age, mean ± SD, 20.6 ± 2...
February 14, 2017: Journal of Sports Medicine and Physical Fitness
https://www.readbyqxmd.com/read/28197354/neuromuscular-coordination-deficit-persists-12-months-after-acl-reconstruction-but-can-be-modulated-by-6-weeks-of-kettlebell-training-a-case-study-in-women-s-elite-soccer
#8
Mette K Zebis, Christoffer H Andersen, Jesper Bencke, Christina Ørntoft, Connie Linnebjerg, Per Hölmich, Kristian Thorborg, Per Aagaard, Lars L Andersen
The aim of the present single-case study was to investigate the effect of 6 weeks' kettlebell training on the neuromuscular risk profile for ACL injury in a high-risk athlete returning to sport after ACL reconstruction. A female elite soccer player (age 21 years) with no previous history of ACL injury went through neuromuscular screening as measured by EMG preactivity of vastus lateralis and semitendinosus during a standardized sidecutting maneuver. Subsequently, the player experienced a noncontact ACL injury...
2017: Case Reports in Orthopedics
https://www.readbyqxmd.com/read/28195989/time-since-menopause-and-skeletal-muscle-estrogen-receptors-pgc-1%C3%AE-and-ampk
#9
Young-Min Park, Rocio I Pereira, Christopher B Erickson, Tracy A Swibas, Chounghun Kang, Rachael E Van Pelt
OBJECTIVE: Short-term administration of estradiol (E2) improves insulin-stimulated glucose disposal rate in early postmenopausal (EPM) women compared with a reduction in late postmenopausal (LPM) women. The underlying mechanisms by which E2 action on glucose disposal rate reversed from beneficial early to harmful late in menopause is unknown, but might include adverse changes in estrogen receptors (ERs) or other biomarkers of cellular energy metabolism with age or duration of estrogen deficiency...
February 13, 2017: Menopause: the Journal of the North American Menopause Society
https://www.readbyqxmd.com/read/28195934/muscle-activation-differs-between-partial-and-full-back-squat-exercise-with-external-load-equated
#10
Josinaldo Jarbas da Silva, Brad Jon Schoenfeld, Priscyla Nardi Marchetti, Silvio Luis Pecoraro, Julia Maria D'Andréa Greve, Paulo Henrique Marchetti
Changes in range of motion affect the magnitude of the load during the squat exercise and, consequently may influence muscle activation. The purpose of this study was to evaluate muscle activation between the partial and full back squat exercise with external load equated on a relative basis between conditions. Fifteen young, healthy, resistance trained men (age: 26±5 years, height: 173±6 cm) performed a back squat at their 10 repetition maximum using two different ranges of motion (partial and full) in a randomized, counterbalanced fashion...
February 13, 2017: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/28195849/detection-and-alterations-of-acetylcarnitine-in-human-skeletal-muscles-by-1h-mrs-at-7-t
#11
Radka Klepochová, Ladislav Valkovič, Martin Gajdošík, Thomas Hochwartner, Harald Tschan, Michael Krebs, Siegfried Trattnig, Martin Krššák
OBJECTIVES: The aims of this study were to detect the acetylcarnitine resonance line at 2.13 ppm in the human vastus lateralis and soleus muscles, assess T1 and T2 relaxation times, and investigate the diurnal and exercise-related changes in absolute concentration noninvasively, using proton magnetic resonance spectroscopy at 7 T. MATERIALS AND METHODS: All measurements were performed on a 7 T whole-body Magnetom MR system with a 28-channel knee coil. Five healthy, moderately trained volunteers participated in the assessment of the detectability, repeatability, and relaxation times of acetylcarnitine...
February 10, 2017: Investigative Radiology
https://www.readbyqxmd.com/read/28194796/the-utility-of-the-musculocutaneous-anterolateral-thigh-flap-in-pharyngolaryngeal-reconstruction-in-the-high-risk-patient
#12
Adrian S H Ooi, Chad M Teven, Amir Inbal, David W Chang
BACKGROUND AND OBJECTIVES: Prior radiotherapy leads to increased wound complication rates for microsurgical reconstruction of pharyngolaryngeal (PL) defects. Incorporating vastus lateralis muscle together with anterolateral thigh flap (ALT) skin in defect reconstruction is useful in protecting vital structures and reinforcing irradiated neck skin and suture lines. This study shows the utility of the musculocutaneous ALT (MC ALT) in PL reconstruction in previously irradiated patients. METHODS: A single-surgeon, retrospective chart review of all patients with defects of the PL region where an MC ALT was used for reconstruction from February 2014 to May 2016...
February 14, 2017: Journal of Surgical Oncology
https://www.readbyqxmd.com/read/28194519/electromechanical-delays-during-a-fatiguing-exercise-and-recovery-in-patients-with-myotonic-dystrophy-type-1
#13
Fabio Esposito, Emiliano Cè, Susanna Rampichini, Elena Monti, Eloisa Limonta, Barbara Fossati, Giovanni Meola
PURPOSE: The partitioning of the electromechanical delay by an electromyographic (EMG), mechanomyographic (MMG) and force combined approach can provide further insight into the electrochemical and mechanical processes involved with skeletal muscle contraction and relaxation. The aim of the study was to monitor by this combined approach the changes in delays' electrochemical and mechanical components throughout a fatiguing task and during recovery in patients with myotonic dystrophy type 1 (DM1), who present at the skeletal muscle level fibres rearrangement, muscle weakness and myotonia, especially in the distal muscles...
February 14, 2017: European Journal of Applied Physiology
https://www.readbyqxmd.com/read/28193782/mitochondrial-mass-and-activity-as-a-function-of-body-composition-in-individuals-with-spinal-cord-injury
#14
Laura C O'Brien, Rodney C Wade, Liron Segal, Qun Chen, Jeannie Savas, Edward J Lesnefsky, Ashraf S Gorgey
Spinal cord injury (SCI) is accompanied by deterioration in body composition and severe muscle atrophy. These changes put individuals at risk for insulin resistance, type II diabetes, and cardiovascular disease. To determine the relationships between skeletal muscle mitochondrial mass, activity, and body composition, 22 men with motor complete SCI were studied. Body composition assessment was performed using dual-energy X-ray absorptiometry and magnetic resonance imaging. Skeletal muscle biopsies were obtained from the vastus lateralis muscle to measure citrate synthase (CS) and complex III (CIII) activity...
February 2017: Physiological Reports
https://www.readbyqxmd.com/read/28183821/exercise-induced-upregulation-of-endothelial-adhesion-molecules-in-human-skeletal-muscle-and-number-of-circulating-cells-with-remodeling-properties
#15
Anna Strömberg, Eric Rullman, Eva Jansson, Thomas Gustafsson
Multipotent cells have received great interest due to their potential capacity to repair and remodel peripheral tissues. We examined the effect of an acute exercise bout on the number of circulating cells with known remodeling properties, and the level of factors in plasma and skeletal muscle tissue with potential to recruit these cells. Twenty healthy male subjects performed a 60 min cycling exercise. Blood samples for flow cytometry were drawn from 10 subjects (Group 1) before and up to 2 h after exercise, and absolute cell counts of the classical (CD14(++)CD16(-)), intermediate (CD14(++)CD16(+)), and nonclassical (CD14(+)CD16(++)) monocyte (MO) subpopulations, and of CD45(dim)CD34(+)VEGFR2(+) endothelial progenitor cells (EPCs) were measured using bead-based determination...
February 9, 2017: Journal of Applied Physiology
https://www.readbyqxmd.com/read/28179011/cardiorespiratory-and-metabolic-responses-to-body-mass-based-squat-exercise-in-young-men
#16
Miki Haramura, Yohei Takai, Takaya Yoshimoto, Masayoshi Yamamoto, Hiroaki Kanehisa
BACKGROUND: The purpose of this study was to quantify cardiorespiratory and metabolic responses to body mass-based squat exercise, with specific emphasis on the relationships with the exercise duration. METHODS: Fifteen healthy young men performed body mass-based squat exercise as well as an incremental loaded bicycle test, which determine maximal oxygen uptake and maximal heart rate, with an interval of 2 days between the tests. During both tasks, oxygen uptake, blood lactate concentration (BLa), and heart rate (HR) were determined...
February 8, 2017: Journal of Physiological Anthropology
https://www.readbyqxmd.com/read/28177744/impact-of-hot-and-cold-exposure-on-human-skeletal-muscle-gene-expression
#17
Roksana B Zak, Robert J Shute, Matthew W S Heesch, D Taylor La Salle, Matthew P Bubak, Nicholas E Dinan, Terence L Laursen, Dustin Russel Slivka
: Many human diseases lead to a loss of skeletal muscle metabolic function and mass. Local and environmental temperature can modulate the exercise-stimulated response of several genes involved in mitochondrial biogenesis and skeletal muscle function in a human model. However, the impact of environmental temperature, independent of exercise, has not been addressed in a human model. Thus, the purpose of this study was to compare the effects of exposure to hot, cold, and room temperature conditions on skeletal muscle gene expression related to mitochondrial biogenesis and muscle mass...
December 1, 2016: Applied Physiology, Nutrition, and Metabolism, Physiologie Appliquée, Nutrition et Métabolisme
https://www.readbyqxmd.com/read/28177725/effects-of-phosphatidic-acid-supplementation-on-muscle-thickness-and-strength-in-resistance-trained-men
#18
Adam M Gonzalez, Katie M Sell, Jamie J Ghigiarelli, Christopher F Kelly, Edward W Shone, Matthew R Accetta, Jamie B Baum, Gerald T Mangine
The purpose of this study was to investigate the effects of phosphatidic acid (PA) supplementation on muscle thickness and strength following an 8-week supervised resistance-training program. Fifteen resistance trained men (22.8±3.5 y; 80.6±8.7 kg; 178.1±5.6 cm; 14.6±8.8% body fat) were randomly assigned to a group that either consumed 750 mg of PA or a placebo (PL). Testing was carried out before (PRE) and after (POST) training/supplementation for muscle thickness and strength. Muscle thickness of the rectus femoris (RF), vastus lateralis (VL), biceps brachii (BB), and triceps brachii (TB) muscles were measured via ultrasonography along with one repetition maximum (1RM) of squat, deadlift, and bench press...
January 5, 2017: Applied Physiology, Nutrition, and Metabolism, Physiologie Appliquée, Nutrition et Métabolisme
https://www.readbyqxmd.com/read/28177124/acute-exercise-elicits-differential-expression-of-insulin-resistance-genes-in-the-skeletal-muscle-of-patients-with-polycystic-ovary-syndrome
#19
Wagner Silva Dantas, Igor Hisashi Murai, Luiz Augusto Perandini, Hatylas Azevedo, Carlos Alberto Moreira-Filho, Niels Olsen Saraiva Camara, Hamilton Roschel, Bruno Gualano
OBJECTIVE: This study aimed to explore the role of acute exercise on skeletal muscle gene expression related to insulin resistance in patients with polycystic ovary syndrome (PCOS) and controls. METHODS: Four obese women with PCOS and 4 body controls subjects (CTRL) participated in this study. After an overnight fast, the subjects underwent a single 40-minute bout of aerobic exercise. Muscle samples were obtained from vastus lateralis at baseline and 60 minutes after exercise...
February 8, 2017: Clinical Endocrinology
https://www.readbyqxmd.com/read/28171785/dynamic-versus-isometric-electromechanical-delay-in-non-fatigued-and-fatigued-muscle-a-combined-electromyographic-mechanomyographic-and-force-approach
#20
Cory M Smith, Terry J Housh, Ethan C Hill, Glen O Johnson, Richard J Schmidt
This study used a combined electromyographic, mechanomyographic, and force approach to identify electromechanical delay (EMD) from the onsets of the electromyographic to force signals (EMDE-F), onsets of the electromyographic to mechanomyogrpahic signals (EMDE-M), and onsets of mechanomyographic to force signals (EMDM-F). The purposes of the current study were to examine: (1) the differences in EMDE-F, EMDE-M, and EMDM-F from the vastus lateralis during maximal, voluntary dynamic (1 repetition maximum [1-RM]) and isometric (maximal voluntary isometric contraction [MVIC]) muscle actions; and (2) the effects of fatigue on EMDE-F, EMDM-F, and EMDE-M...
January 27, 2017: Journal of Electromyography and Kinesiology
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