keyword
MENU ▼
Read by QxMD icon Read
search

Isometric

keyword
https://www.readbyqxmd.com/read/29351822/influence-of-obstructive-sleep-apnea-in-the-functional-aspects-of-patients-with-osteoarthritis
#1
Andressa Silva, Marco Túlio Mello, Paula Regina Serrão, Roberta Pitta Luz, Franciele Ruiz, Lia Rita Bittencourt, Sergio Tufik, Stela Márcia Mattiello
STUDY OBJECTIVES: It has been demonstrated in recent studies that obstructive sleep apnea (OSA) is the most prevalent sleep disorder in patients with osteoarthritis (OA), and thus the current study aimed to investigate the influence of OSA on knee extensor torque, pain, stiffness, and physical function in men with low-grade knee OA. METHODS: The study included 60 male volunteers, aged 40 to 70 years, allocated into four groups: Group 1 (G1) Control (n = 15): without OA and without OSA; Group 2 (G2) (n = 15): with OA and without OSA; Group 3 (G3) (n = 15): without OA and with OSA; and Group 4 (G4) (n = 15) with OA and with OSA...
January 16, 2018: Journal of Clinical Sleep Medicine: JCSM: Official Publication of the American Academy of Sleep Medicine
https://www.readbyqxmd.com/read/29351439/role-of-reactive-oxygen-species-and-sulfide-quinone-oxoreductase-in-hydrogen-sulfide-induced-contraction-of-rat-pulmonary-arteries
#2
Jesus Prieto-Lloret, Vladimir A Snetkov, Yasin Shaifta, Inmaculada Docio, Michelle J Connolly, Charles E Mackay, Greg A Knock, Jeremy Pt Ward, Philip I Aaronson
Application of H2S ('sulfide') elicits a complex contraction in rat pulmonary arteries (PA) comprising a small transient contraction (phase 1; Ph1) followed by relaxation and then a second, larger, and more sustained contraction (phase 2; Ph2). We investigated the mechanisms causing this response using isometric myography in rat second order PA, with Na2S as a sulfide donor. Both phases of contraction to 1000μM Na2S were attenuated by the pan-PKC inhibitor Gö6983 (3μM) and by 50μM ryanodine; the Ca2+ channel blocker nifedipine (1μM) was without effect...
December 28, 2017: American Journal of Physiology. Lung Cellular and Molecular Physiology
https://www.readbyqxmd.com/read/29351162/potentiation-effects-of-the-french-contrast-method-on-the-vertical-jumping-ability
#3
Joseba Andoni Hernández-Preciado, Eneko Baz, Carlos Balsalobre-Fernández, David Marchante, Jordan Santos-Concejero
This study examined the acute effects of the potentiation protocol known as French Contrast Method on the vertical jumping ability measured by a countermovement jump (CMJ). 31 athletes participated in the study (intervention group n=17 and control group n=14). The CMJ height was measured using the IOS application MyJump App 2.0 pre- and post- the French Contrast protocol, which consisted of 3 sets of isometric partial squats, drop jumps, dynamic half-squats and hurdle jumps. The CMJ height improved from its baseline values by 5...
January 17, 2018: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/29351158/physical-performance-measures-of-flexibility-hip-strength-lower-limb-power-and-trunk-endurance-in-healthy-navy-cadets-normative-data-and-differences-between-sex-and-limb-dominance
#4
Thiago Jambo Alves Lopes, Milena Simic, Daniel de Souza Alves, Priscila Dos Santos Bunn, Allan Inoue Rodrigues, Bruno de Souza Terra, Maicom da Silva Lima, Fabrício Miranda Ribeiro, Patrick Vilão, Evangelos Pappas
The objectives were to provide normative data on commonly used physical performance tests that may be associated with musculoskeletal injuries in Navy cadets, and assess for sex and limb dominance differences. A large cohort of Navy cadets were assessed for physical performance tests of flexibility (ankle dorsiflexion range of motion and sit and reach), isometric hip strength, lower limb power (single leg hop), and trunk endurance (plank and side plank tests). Besides providing normative data tables, sex and limb dominance differences were assessed by a two-way mixed ANOVA...
January 17, 2018: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/29350794/the-role-of-electrodiagnosis-with-long-exercise-test-in-mcardle-disease
#5
Claudio Semplicini, Marianne Hézode-Arzel, Pascal Laforêt, Anthony Béhin, Sarah Leonard-Louis, Jean-Yves Hogrel, François Petit, Bruno Eymard, Tanya Stojkovic, Emmanuel Fournier
INTRODUCTION: We evaluated the role of an electrodiagnsotic provocative test (long exercise test, LET) in McArdle disease. METHODS: Twenty-five McArdle patients and two control groups underwent an electrodiagnsotic protocol with LET, consisting of recording the compound muscle action potential (CMAP) before and after 5 minutes of isometric contraction. RESULTS: LET disclosed a post-exercise decrease in CMAP amplitude in 23/25 McArdle patients...
January 19, 2018: Muscle & Nerve
https://www.readbyqxmd.com/read/29350554/quadriceps-neuromuscular-function-and-jump-landing-sagittal-plane-knee-biomechanics-after-anterior-cruciate-ligament-reconstruction
#6
Sarah H Ward, Troy Blackburn, Darin A Padua, Laura E Stanley, Matthew S Harkey, Brittney A Luc-Harkey, Brian G Pietrosimone
CONTEXT:   Aberrant biomechanics may affect force attenuation at the knee during dynamic activities, potentially increasing the risk of sustaining a knee injury or hastening the development of osteoarthritis after anterior cruciate ligament reconstruction (ACLR). Impaired quadriceps neuromuscular function has been hypothesized to influence the development of aberrant biomechanics. OBJECTIVE:   To determine the association between quadriceps neuromuscular function (strength, voluntary activation, and spinal-reflex and corticomotor excitability) and sagittal-plane knee biomechanics during jump landings in individuals with ACLR...
January 19, 2018: Journal of Athletic Training
https://www.readbyqxmd.com/read/29347220/geometrical-properties-of-rigid-frictionless-granular-packings-as-a-function-of-particle-size-and-shape
#7
Jean-François Camenen, Yannick Descantes
Three-dimensional discrete numerical simulation is used to investigate the properties of close-packed frictionless granular assemblies as a function of particle polydispersity and shape. Unlike some experimental results, simulations show that disordered packings of pinacoids (eight-face convex polyhedra) achieve higher solid fraction values than amorphous packings of spherical or rounded particles, thus fulfilling the analog of Ulam's conjecture stated by Jiao and co-workers for random packings [Y. Jiao and S...
July 2017: Physical Review. E
https://www.readbyqxmd.com/read/29345963/deletion-of-estrogen-receptor-alpha-in-skeletal-muscle-results-in-impaired-contractility-in-female-mice
#8
Brittany C Collins, Tara L Mader, Christine A Cabelka, Melissa R Iñigo, Espen E Spangenburg, Dawn A Lowe
Estradiol deficiency in females can result in skeletal muscle strength loss, and treatment with estradiol mitigates the loss. There are three primary estrogen receptors and estradiol elicits effects through these receptors in various tissues. Ubiquitous estrogen receptor α (ERα) knockout mice exhibit numerous biological disorders, but little is known regarding the specific role of ERα in skeletal muscle contractile function. The purpose of this study was to determine the impact of skeletal muscle specific ERα deletion on contractile function, hypothesizing that ERα is a main receptor through which estradiol affects muscle strength in females...
January 18, 2018: Journal of Applied Physiology
https://www.readbyqxmd.com/read/29342246/associations-of-quadriceps-torque-properties-with-muscle-size-attenuation-and-intra-muscular-adipose-tissue-in-older-adults
#9
Andrew W Frank-Wilson, Didier Chalhoub, Pedro Figueiredo, Pálmi V Jónsson, Kristín Siggeirsdóttir, Sigurdur Sigurdsson, Gudny Eiriksdottir, Vilmundur Guðnason, Lenore Launer, Tamara B Harris
Background: Atrophy and fatty infiltration of muscle with aging are associated with fractures and falls, however, their direct associations with muscle function are not well described. It was hypothesized that participants with lower quadriceps muscle attenuation, area, and greater intra-muscular adipose tissue (IMAT) will exhibit slower rates of torque development (RTD) and lower peak knee extension torques. Methods: Data from 4842 participants (2041 men, 2801 women) from the Age Gene/Environment Susceptibility Reykjavik Study (mean age 76±0...
January 12, 2018: Journals of Gerontology. Series A, Biological Sciences and Medical Sciences
https://www.readbyqxmd.com/read/29342097/time-domain-near-infrared-spectroscopy-device-for-monitoring-muscle-oxidative-metabolism-custom-probe-and-in-vivo-applications
#10
Rebecca Re, Ileana Pirovano, Davide Contini, Lorenzo Spinelli, Alessandro Torricelli
Measurement of muscle oxidative metabolism is of interest for monitoring the training status in athletes and the rehabilitation process in patients. Time domain near infrared spectroscopy (TD NIRS) is an optical technique that allows the non-invasive measurement of the hemodynamic parameters in muscular tissue: concentrations of oxy- and deoxy-hemoglobin, total hemoglobin content, and tissue oxygen saturation. In this paper, we present a novel TD NIRS medical device for muscle oxidative metabolism. A custom-printed 3D probe, able to host optical elements for signal acquisition from muscle, was develop for TD NIRS in vivo measurements...
January 17, 2018: Sensors
https://www.readbyqxmd.com/read/29339983/analysis-of-the-hamstring-muscle-activation-during-two-injury-prevention-exercises
#11
Alireza Monajati, Eneko Larumbe-Zabala, Mark Goss-Sampson, Fernando Naclerio
The aim of this study was to perform an electromyographic and kinetic comparison of two commonly used hamstring eccentric strengthening exercises: Nordic Curl and Ball Leg Curl. After determining the maximum isometric voluntary contraction of the knee flexors, ten female athletes performed 3 repetitions of both the Nordic Curl and Ball Leg Curl, while knee angular displacement and electromyografic activity of the biceps femoris and semitendinosus were monitored. No significant differences were found between biceps femoris and semitendinosus activation in both the Nordic Curl and Ball Leg Curl...
December 2017: Journal of Human Kinetics
https://www.readbyqxmd.com/read/29338847/evaluation-and-validation-of-musculoskeletal-force-feasible-set-indices-application-to-manual-wheelchair-propulsion
#12
Vincent Hernandez, Philippe Gorce, Nasser Rezzoug
The aim of this work was to assess handrim wheelchair propulsion effectiveness, related to the applied forces on the handrim, through the force feasible set. For a given posture of the upper-limb, it represents the set of isometric forces that can be applied on the handrim in any direction. The force feasible set was predicted from a musculoskeletal model of the upper-limb and trunk (10 degrees of freedom and 56 muscles). The aim of the first part of the study was to compare the force feasible set prediction and the force currently applied on the handrim...
December 15, 2017: Journal of Biomechanics
https://www.readbyqxmd.com/read/29338015/exercise-induced-circulating-microrna-changes-in-athletes-in-various-training-scenarios
#13
Martin Horak, Filip Zlamal, Robert Iliev, Jan Kucera, Jan Cacek, Lenka Svobodova, Zuzana Hlavonova, Tomas Kalina, Ondrej Slaby, Julie Bienertova-Vasku
BACKGROUND: The aim of the study was to compare selected extracellular miRNA levels (miR-16, miR-21, miR-93 and miR-222 with the response to 8-week-long explosive strength training (EXPL), hypertrophic strength training (HYP) and high-intensity interval training (HIIT). METHODS: 30 young male athletes of white European origin (mean age: 22.5 ± 4.06 years) recruited at the Faculty of Sports Studies of Masaryk University were enrolled in this study. The study participants were randomly assigned to three possible training scenarios: EXPL, HYP or HITT and participated in 8-week-long program in given arm...
2018: PloS One
https://www.readbyqxmd.com/read/29337833/effects-of-plyometric-and-resistance-training-on-muscle-strength-explosiveness-and-neuromuscular-function-in-young-adolescent-soccer-players
#14
Brandon John McKinlay, Phillip Wallace, Raffy Dotan, Devon Long, Craig Tokuno, David Gabriel, Bareket Falk
This study examined the effect of 8-weeks of free-weight-resistance (RT) and plyometric (PLYO) training on maximal strength, explosiveness and jump performance compared with no added training (CON), in young male soccer players. Forty-one 11[FIGURE DASH]13-year-old soccer players were divided into three groups (RT, PLYO, CON). All participants completed isometric and dynamic (240°/s) knee extensions pre- and post-training. Peak torque (pT), peak rate of torque development (pRTD), electromechanical-delay (EMD), rate of muscle activation (Q50), m...
January 4, 2018: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/29337009/coherence-and-interlimb-force-control-effects-of-visual-gain
#15
Nyeonju Kang, James H Cauraugh
Neural coupling across hemispheres and homologous muscles often appears during bimanual motor control. Force coupling in a specific frequency domain may indicate specific bimanual force coordination patterns. This study investigated coherence on pairs of bimanual isometric index finger force while manipulating visual gain and task asymmetry conditions. We used two visual gain conditions (low and high gain = 8 and 512 pixels/N), and created task asymmetry by manipulating coefficient ratios imposed on the left and right index finger forces (0...
January 11, 2018: Neuroscience Letters
https://www.readbyqxmd.com/read/29335013/fit-for-function-study-protocol-for-a-randomized-controlled-trial
#16
Julie Richardson, Ada Tang, Gordon Guyatt, Lehana Thabane, Feng Xie, Demetrios Sahlas, Robert Hart, Rebecca Fleck, Genevieve Hladysh, Louise Macrae
BACKGROUND: The current state of evidence suggests that community-based exercise programs are beneficial in improving impairment, function, and health status, and are greatly needed for persons with stroke. However, limitations of these studies include risk of bias, feasibility, and cost issues. METHODS/DESIGN: This single-blinded, randomized controlled trial (RCT) of 216 participants with stroke will compare the effectiveness of a 12-week YMCA community-based wellness program (FIT for FUNCTION) specifically designed for community-dwelling persons with stroke to persons who receive a standard YMCA membership...
January 15, 2018: Trials
https://www.readbyqxmd.com/read/29333724/voluntary-activation-and-twitch-potentiation-of-the-elbow-flexors-across-supinated-neutral-and-pronated-forearm-orientations
#17
Sienna Kohn, Rowan R Smart, Jennifer M Jakobi
Elbow flexion force depends on forearm orientation with supinated and neutral being stronger than pronated. The purpose of this study was to assess the influence of forearm orientation on voluntary activation (VA), postactivation potentiation (PAP), and twitch properties. Eleven males (23 ± 3 years) performed isometric elbow flexion maximal voluntary contractions (MVC) in supinated, neutral, and pronated forearm orientations with supramaximal stimulation to the biceps brachii muscle belly before, during, and after the MVC...
January 2018: Physiological Reports
https://www.readbyqxmd.com/read/29332740/an-electromyographic-analysis-of-selected-asana-in-experienced-yogic-practitioners
#18
Kathleen Kelley, Katherine Slattery, Kaitlyn Apollo
The purpose of this study was to assess electromyographic (EMG) output of the anterior tibialis (TA), medial head of the gastrocnemius (GA), rectus femoris (RF), bicep femoris (BF), and gluteus medius (GM) in experienced yogic practitioners during selected yoga asana. A secondary purpose was to examine the differences in EMG output in unilateral V. bilateral standing yoga asana. The study was a single occasion descriptive design. Thirteen healthy yoga practitioners (1 male, 12 females, average age of 37.5) with more than five years of experience were recruited...
January 2018: Journal of Bodywork and Movement Therapies
https://www.readbyqxmd.com/read/29332734/correlation-between-cervical-flexor-muscle-thickness-and-craniocervical-flexion-torque-in-healthy-subjects
#19
Hiroshi Ishida, Tadanobu Suehiro, Susumu Watanabe
The purpose of this study was to clarify the relationship between the size of the cervical flexor muscles and craniocervical (CC) flexion torque. Thirty-eight healthy men participated in this study. Thickness of the deep cervical flexor (DCF) and sternocleidomastoid (SM) muscles were measured using ultrasonography. Maximal isometric CC flexion torque was measured using dynamometry. The DCF and SM muscle thickness and CC flexion torque were normalized relative to body weight. Correlations between normalized muscle thickness and normalized CC flexion torque were determined...
January 2018: Journal of Bodywork and Movement Therapies
https://www.readbyqxmd.com/read/29329907/influence-of-motor-imagery-on-spinal-reflex-excitability-of-multiple-muscles
#20
Kento Nakagawa, Yohei Masugi, Akira Saito, Hiroki Obata, Kimitaka Nakazawa
The effects of motor imagery on spinal reflexes such as the H-reflex are unclear. One reason for this is that the muscles that can be used to record spinal reflexes are limited to traditional evoking methods Recently, transcutaneous spinal cord stimulation has been used for inducing spinal reflexes from multiple muscles and we aimed to examine the effect of motor imagery on spinal reflexes from multiple muscles. Spinal reflexes evoked by transcutaneous spinal cord stimulation were recorded from six muscles from lower limbs during motor imagery of right wrist extension and ankle plantarflexion with maximum isometric contraction...
January 9, 2018: Neuroscience Letters
keyword
keyword
45577
1
2
Fetch more papers »
Fetching more papers... Fetching...
Read by QxMD. Sign in or create an account to discover new knowledge that matter to you.
Remove bar
Read by QxMD icon Read
×

Search Tips

Use Boolean operators: AND/OR

diabetic AND foot
diabetes OR diabetic

Exclude a word using the 'minus' sign

Virchow -triad

Use Parentheses

water AND (cup OR glass)

Add an asterisk (*) at end of a word to include word stems

Neuro* will search for Neurology, Neuroscientist, Neurological, and so on

Use quotes to search for an exact phrase

"primary prevention of cancer"
(heart or cardiac or cardio*) AND arrest -"American Heart Association"