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Isometric exercise

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https://www.readbyqxmd.com/read/29665844/handgrip-strength-is-positively-related-to-blood-pressure-and-hypertension-risk-results-from-the-national-health-and-nutrition-examination-survey
#1
Chao Ji, Liqiang Zheng, Rui Zhang, Qijun Wu, Yuhong Zhao
BACKGROUND: Isometric handgrip resistance exercise, a nonpharmacological lifestyle modification, has been recommended as a first-line treatment for hypertension. This study aimed to examine the relationship of handgrip strength to blood pressure and the risk of hypertension. METHODS: The responses and examination of 4597 participants in the National Health and Nutrition Examination Survey (NHANES) were analyzed in this study. Systolic blood pressure (SBP) and diastolic blood pressure (DBP) were transformed to age- and sex-specific z-scores...
April 17, 2018: Lipids in Health and Disease
https://www.readbyqxmd.com/read/29663505/global-and-regional-left-ventricular-circumferential-strain-during-incremental-cycling-and-isometric-knee-extension-exercise
#2
Alexander Beaumont, Nicholas Sculthorpe, John Hough, Viswanath Unnithan, Joanna Richards
BACKGROUND: The objective of this study was to investigate left ventricular (LV) circumferential strain responses to incremental cycling and isometric knee extension exercises. METHODS: Twenty-six healthy male participants (age = 30 ± 6 years) were used to study LV global (GCS) and regional circumferential strain at the apex (ACS) and base (BCS) during incremental cycling at 30% and 60% work rate maximum (Wmax ) and short-duration (15 seconds contractions) isometric knee extensions at 40% and 75% maximum voluntary contraction (MVC) using two-dimensional speckle tracking echocardiography...
April 16, 2018: Echocardiography
https://www.readbyqxmd.com/read/29662306/short-term-vascular-hemodynamic-responses-to-isometric-exercise-in-young-adults-and-in-the-elderly
#3
Renee Hartog, Davide Bolignano, Eric Sijbrands, Giacomo Pucci, Francesco Mattace-Raso
Background: Vascular aging is known to induce progressive stiffening of the large elastic arteries, altering vascular hemodynamics under both rest and stress conditions. In this study, we aimed to investigate changes in vascular hemodynamics in response to isometric handgrip exercise across ages. Participants and methods: We included 62 participants, who were divided into three age categories: 20-40 (n=22), 41-60 (n=20), and 61-80 (n=20) years. Vascular hemodynamics were measured using the Mobil-o-Graph® based on the pulsatile pressure changes in the brachial artery...
2018: Clinical Interventions in Aging
https://www.readbyqxmd.com/read/29661570/is-hip-strengthening-the-best-treatment-option-for-females-with-patellofemoral-pain-a-randomized-controlled-trial-of-three-different-types-of-exercises
#4
Marcelo Camargo Saad, Rodrigo Antunes de Vasconcelos, Letícia Villani de Oliveira Mancinelli, Matheus Soares de Barros Munno, Rogério Ferreira Liporaci, Débora Bevilaqua Grossi
OBJECTIVE: To evaluate the effect of three types of exercise intervention in patients with patellofemoral pain and to verify the contributions of each intervention to pain control, function, and lower extremity kinematics. METHODS: A randomized controlled, single-blinded trial was conducted. Forty women with patellofemoral pain were randomly allocated into four groups: hip exercises, quadriceps exercises, stretching exercises and a control group (no intervention)...
April 4, 2018: Brazilian Journal of Physical Therapy
https://www.readbyqxmd.com/read/29661032/results-from-a-pilot-study-of-handheld-vibration-exercise-intervention-reduces-upper-limb-dysfunction-and-fatigue-in-breast-cancer-patients-undergoing-radiotherapy-vibbra-study
#5
Sarah Kneis, Anja Wehrle, Anne Ilaender, Natalja Volegova-Neher, Albert Gollhofer, Hartmut Bertz
PURPOSE: Although there is evidence that breast cancer patients benefit from exercising during treatment, exercising during radiotherapy and especially the effects on upper-limb dysfunctions have been infrequently assessed. Therefore, we primarily aimed to confirm our interventions' feasibility and secondarily aimed to affect upper-limb dysfunctions and fatigue. METHODS: Twenty-two breast cancer patients scheduled for radiotherapy were allocated to an intervention (IG) or a passive control group (CG) as they preferred...
April 1, 2018: Integrative Cancer Therapies
https://www.readbyqxmd.com/read/29652541/dynamic-cerebral-autoregulation-is-impaired-during-sub-maximal-isometric-handgrip-in-patients-with-heart-failure
#6
Juliana R Caldas, Ronney B Panerai, Angela S M Salinet, Edson Bor-Seng-Shu, Filomena R B G Galas, Graziela S R Ferreira, Ligia Camara, Rogerio Hora Passos, Juliano P Almeida, Ricardo C Nogueira, Marcelo de Lima Oliveira M, Thompson G Robinson, Ludhmila A Hajjar
BACKGROUND: The incidence of neurological complications, including stroke and cognitive dysfunction is elevated in heart failure (HF) patients with reduced ejection fraction. We hypothesized that the cerebrovascular response to isometric handgrip (iHG) is altered in HF patients. METHODS: Adults with HF and healthy volunteers were included. Cerebral blood velocity (CBV, transcranial Doppler, middle cerebral artery) and arterial blood pressure (BP, Finometer) were continuously recorded supine for 6 minutes, corresponding to one min baseline, three min of iHG exercise, at 30% maximum voluntary contraction, followed by two min of recovery...
April 13, 2018: American Journal of Physiology. Heart and Circulatory Physiology
https://www.readbyqxmd.com/read/29651252/intra-session-and-inter-day-reliability-of-the-myon-320-electromyography-system-during-sub-maximal-contractions
#7
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/29649012/clinical-improvements-are-not-explained-by-changes-in-tendon-structure-on-utc-following-an-exercise-program-for-patellar-tendinopathy
#8
Mathijs van Ark, Ebonie Rio, Jill Cook, Inge van den Akker-Scheek, James E Gaida, Johannes Zwerver, Sean Docking
OBJECTIVES: The aim of this study was to investigate the effects of a 4-week in-season exercise program of isometric or isotonic exercises on tendon structure and dimensions as quantified by Ultrasound Tissue Characterization (UTC). DESIGN: Randomized clinical trial. Volleyball and basketball players (16-31 years, n=29) with clinically diagnosed patellar tendinopathy were randomized to a 4-week isometric or isotonic exercise program. The programs were designed to decrease patellar tendon pain...
April 11, 2018: American Journal of Physical Medicine & Rehabilitation
https://www.readbyqxmd.com/read/29648933/influence-of-body-position-on-shoulder-and-trunk-muscle-activation-during-resisted-isometric-shoulder-external-rotation
#9
David A Krause, Lucas G Dueffert, Jaclyn L Postma, Eric T Vogler, Amy J Walsh, John H Hollman
BACKGROUND: External rotation (ER) strengthening of the shoulder is an integral component of rehabilitative and preventative programs for overhead athletes. A variety of shoulder ER strengthening exercises are reported, including those intended to integrate the core musculature. The purpose of this study was to examine ER torque and electromyographic (EMG) activation of shoulder and trunk muscles while performing resisted isometric shoulder ER in 3 positions (standing, side lying, and side plank)...
April 1, 2018: Sports Health
https://www.readbyqxmd.com/read/29644702/influence-of-group-iii-iv-muscle-afferents-on-small-muscle-mass-exercise-performance-a-bioenergetics-perspective
#10
Ryan M Broxterman, Thomas J Hureau, Gwenael Layec, David E Morgan, Amber D Bledsoe, Jacob E Jessop, Markus Amann, Russell S Richardson
The direct influence of group III/IV muscle afferents on exercise performance remains equivocal. Therefore, all-out intermittent isometric single-leg knee-extensor exercise and phosphorous magnetic resonance spectroscopy (31 P-MRS) were utilized to provide a high time resolution assessment of exercise performance and skeletal muscle bioenergetics in control conditions (CTRL) and with the attenuation of group III/IV muscle afferent feedback via lumbar intrathecal fentanyl (FENT). In both conditions, seven recreationally active men performed 60 maximal voluntary quadriceps contractions (MVC; 3 s contraction, 2 s relaxation), while knee-extensor force and 31 P-MRS were assessed during each MVC...
April 12, 2018: Journal of Physiology
https://www.readbyqxmd.com/read/29643061/supplemental-oxygen-improves-in-vivo-mitochondrial-oxidative-phosphorylation-flux-in-sedentary-obese-adults-with-type-2-diabetes
#11
Melanie Cree-Green, Rebecca L Scalzo, Kylie Harrall, Bradley R Newcomer, Irene E Schauer, Amy G Huebschmann, Shawna McMillin, Mark S Brown, David Orlicky, Leslie Knaub, Kristen J Nadeau, P Mason Mcclatchey, Timothy A Bauer, Judith G Regensteiner, Jane E B Reusch
Type 2 diabetes is associated with impaired exercise capacity. Alterations in both muscle perfusion and mitochondrial function can contribute to exercise impairment. We hypothesized that impaired muscle mitochondrial function in type 2 diabetes is mediated, in part, by decreased tissue oxygen delivery and would improve with oxygen supplementation. Ex vivo muscle mitochondrial content and respiration assessed from biopsy samples demonstrated expected differences in obese individuals with (N=18) and without (N=17) diabetes...
April 11, 2018: Diabetes
https://www.readbyqxmd.com/read/29628898/postactivation-potentiation-of-the-plantar-flexors-does-not-directly-translate-to-jump-performance-in-female-elite-young-soccer-players
#12
Olaf Prieske, Nicola A Maffiuletti, Urs Granacher
High-intensity muscle actions have the potential to temporarily improve muscle contractile properties (i.e., postactivation potentiation, PAP) thereby inducing acute performance enhancements. There is evidence that balance training can improve performance during strength exercises. Taking these findings together, the purpose of this study was to examine the acute effects of a combined balance and strength (B+S) exercise vs. a strength only (S) exercise on twitch contractile properties, maximum voluntary strength, and jump performance in young athletes...
2018: Frontiers in Physiology
https://www.readbyqxmd.com/read/29628406/eccentric-training-combined-to-neuromuscular-electrical-stimulation-is-not-superior-to-eccentric-training-alone-for-quadriceps-strengthening-in-healthy-subjects-a-randomized-controlled-trial
#13
Claudia Ferreira Gomes da Silva, Felipe Xavier de Lima E Silva, Karoline Baptista Vianna, Gabriel Dos Santos Oliveira, Marco Aurélio Vaz, Bruno Manfredini Baroni
BACKGROUND: Both eccentric training and neuromuscular electrical stimulation (NMES) are used for quadriceps strengthening. However, the effects of these interventions combined are unclear. OBJECTIVES: To compare the effects of eccentric training combined to NMES and eccentric training alone on structure, strength, and functional performance of knee extensor muscles of healthy subjects. METHODS: This is a three-arm, single-blinded, randomized controlled trial...
March 28, 2018: Brazilian Journal of Physical Therapy
https://www.readbyqxmd.com/read/29618165/small-arteries-stay-stiff-for-a-longer-period-following-vibration-exercises-in-combination-with-blood-flow-restriction
#14
Ulku Karabulut, Murat Karabulut, Eric G James
PURPOSE: The aim of this study was to assess the effect of isometric exercises performed during whole-body vibration (WBV) with and without blood flow restriction (BFR) on arterial elasticity and hemodynamic variables. METHODS: Eight male subjects performed static upper body (UB) and lower body (LB) exercises on a vibration platform with and without BFR. During BFR sessions, BFR cuffs were placed on the arms or legs and inflated to a target pressure. Exercises consisted of eight 45-s sets for UB, and ten 1-min sets for LB...
April 4, 2018: Clinical Physiology and Functional Imaging
https://www.readbyqxmd.com/read/29618132/systemic-exercise-induced-hypoalgesia-following-isometric-exercise-reduces-conditioned-pain-modulation
#15
Ali Alsouhibani, Henrik Bjarke Vaegter, Marie Hoeger Bement
Objective: Physically active individuals show greater conditioned pain modulation (CPM) compared with less active individuals. Understanding the effects of acute exercise on CPM may allow for a more targeted use of exercise in the management of pain. This study investigated the effects of acute isometric exercise on CPM. In addition, the between-session and within-session reliability of CPM was investigated. Design: Experimental, randomized crossover study. Setting: Laboratory at Marquette University...
April 3, 2018: Pain Medicine: the Official Journal of the American Academy of Pain Medicine
https://www.readbyqxmd.com/read/29601220/is-perceived-force-an-accurate-method-of-regulating-exercise-load-for-the-neck
#16
Shaun O'Leary, Adrian M Cush, Woon Yang W Ng, Charlotte Taanevig, Jiahui E Tan, Steven M McPhail
OBJECTIVE: Patient perceived level of force is commonly used to regulate exercise load. This study determined the accuracy of perceived force as a method of regulating exercise load for the cervical flexors and extensors. METHODS: Thirty healthy individuals performed submaximal isometric cervical flexion and extension exercise at perceived intensities (25%, 50%, and 75%) of their maximal voluntary contraction (MVC) with no feedback in a neck dynamometer. Measurements of "actual" versus "perceived" force levels were compared before and after the performance of an MVC...
March 30, 2018: Physiotherapy Theory and Practice
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
#17
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/29596491/core-and-skin-temperature-influences-on-the-surface-electromyographic-responses-to-an-isometric-force-and-position-task
#18
Nico A Coletta, Matthew M Mallette, David A Gabriel, Christopher J Tyler, Stephen S Cheung
The large body of work demonstrating hyperthermic impairment of neuromuscular function has utilized maximal isometric contractions, but extrapolating these findings to whole-body exercise and submaximal, dynamic contractions may be problematic. We isolated and compared core and skin temperature influences on an isometric force task versus a position task requiring dynamic maintenance of joint angle. Surface electromyography (sEMG) was measured on the flexor carpi radialis at 60% of baseline maximal voluntary contraction while either pushing against a rigid restraint (force task) or while maintaining a constant wrist angle and supporting an equivalent inertial load (position task)...
2018: PloS One
https://www.readbyqxmd.com/read/29596017/mechanisms-for-the-increased-fatigability-of-the-lower-limb-in-people-with-type-2-diabetes
#19
Jonathon Senefeld, Steven B Magill, April Harkins, Alison Rosemary Harmer, Sandra K Hunter
Fatiguing exercise is the basis of exercise training and a cornerstone of management of type 2 diabetes mellitus (T2D), however, little is known about the fatigability of limb muscles and the involved mechanisms in people with T2D. The purpose was to compare fatigability of knee extensor muscles between people with T2D and controls without diabetes and determine the neural and muscular mechanisms for a dynamic fatiguing task. Seventeen people with T2D (10 men, 7 women: 59.6{plus minus}9.0 years) and 21 age-, BMI- and physical activity-matched controls (11 men, 10 women: 59...
March 29, 2018: Journal of Applied Physiology
https://www.readbyqxmd.com/read/29584533/rehabilitation-exercises-for-the-gluteus-minimus-muscle-segments-an-electromyography-study
#20
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
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