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Isometric exercise

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https://www.readbyqxmd.com/read/29040646/statins-affect-skeletal-muscle-performance-evidence-for-disturbances-in-energy-metabolism
#1
Neeltje A E Allard, Tom J J Schirris, Rebecca J Verheggen, Frans G M Russel, Richard J Rodenburg, Jan A M Smeitink, Paul D Thompson, Maria T E Hopman, Silvie Timmers
Context: Statin myopathy is linked to disturbances in mitochondrial function and exercise intolerance. Objectives: To determine whether differences exist in exercise performance, muscle function and mitochondrial oxidative capacity and content between symptomatic and asymptomatic statin users, and non-statin using controls. Design: Cross-sectional study. Setting: Department of Physiology of the Radboud University Medical Center...
October 9, 2017: Journal of Clinical Endocrinology and Metabolism
https://www.readbyqxmd.com/read/29040222/neurovascular-response-during-exercise-and-mental-stress-in-anabolic-steroid-users
#2
Rafael Armani Porello, Marcelo Rodrigues Dos Santos, Francis Ribeiro de Souza, Guilherme Wesley Peixoto da Fonseca, Ana Luiza Carrari Sayegh, Tiago Franco de Oliveira, César Abreu Akiho, Maurício Yonamine, Rosa Maria Rodrigues Pereira, Carlos Eduardo Negrão, Maria-Janieire de Nazaré Nunes Alves
PURPOSE: Increased resting muscle sympathetic nerve activity (MSNA) and lower forearm blood flow (FBF) were observed in young men who use anabolic androgenic steroids (AAS). However, the response of MSNA and FBF in AAS users triggered by muscle mechanoreflex and central command has never been tested. Additionally, we evaluated the blood pressure (BP) and heart rate (HR) responses during these maneuvers. METHODS: Nineteen AAS users (AASU) aged 31±6 yr and 18 AAS nonusers (AASNU) aged 29±4 yr were recruited...
October 16, 2017: Medicine and Science in Sports and Exercise
https://www.readbyqxmd.com/read/29036548/acute-response-to-a-2-minute-isometric-exercise-test-predicts-the-blood-pressure-lowering-efficacy-of-isometric-resistance-training-in-young-adults
#3
Yasina B Somani, Anthony W Baross, Robert D Brook, Kevin J Milne, Cheri L McGowan, Ian L Swaine
Background: This work aimed to explore whether different forms of a simple isometric exercise test could be used to predict the blood pressure (BP)-lowering efficacy of different types of isometric resistance training (IRT) in healthy young adults. In light of the emphasis on primary prevention of hypertension, identifying those with normal BP who will respond to IRT is important. Also, heightened BP reactivity increases hypertension risk, and as IRT reduces BP reactivity in patients with hypertension, it warrants further investigation in a healthy population...
September 27, 2017: American Journal of Hypertension
https://www.readbyqxmd.com/read/29034801/gluteus-minimus-and-gluteus-medius-muscle-activity-during-common-rehabilitation-exercises-in-healthy-postmenopausal-women
#4
Charlotte Ganderton, Tania Pizzari, Jill Cook, Adam Semciw
Study Design Controlled laboratory study, cross-sectional. Background The gluteus medius (GMed) and minimus (GMin) provide dynamic stability of the hip joint and pelvis and are susceptible to atrophy and injury with menopause, ageing and disease. Numerous exercises have been reported in the literature to elicit high levels of GMed activity, however few have differentiated between the portions of the GMed, and none have examined GMin. Objectives To quantify and rank the level of muscle activity of the 2 segments of GMin (anterior and posterior fibers) and 3 segments of GMed (anterior, middle and posterior fibers) during 4 isometric and 3 dynamic exercises in a group of healthy, post-menopausal women...
October 15, 2017: Journal of Orthopaedic and Sports Physical Therapy
https://www.readbyqxmd.com/read/29024603/exercise-tolerance-during-muscle-contractions-below-and-above-the-critical-torque-in-different-muscle-groups
#5
Leonardo Henrique Perinotto Abdalla, Benedito Sérgio Denadai, Natalia Menezes Bassan, Camila Coelho Greco
The objective of this study was to test the hypotheses that end-test torque (ET) (expressed as % maximal voluntary contraction - MVC) is higher for plantar flexors (PF) than knee extensors (KE) muscles, whereas impulse above ET (IET) is higher for KE than PF. Thus, we expected that exercise tolerance would be longer for KE than PF only during the exercise performed above ET. After the determination of MVC, forty men performed two 5-min all-out tests to determine ET and IET. Eleven participants performed a further four intermittent isometric tests, to exhaustion, at ET + 5% and ET - 5%, and one test for KE at the exercise intensity (%MVC) corresponding to ET + 5% of PF...
October 12, 2017: Applied Physiology, Nutrition, and Metabolism, Physiologie Appliquée, Nutrition et Métabolisme
https://www.readbyqxmd.com/read/29023563/influence-of-platinum-harmonized-textile-on-neuromuscular-systemic-and-subjective-recovery
#6
Fridolin Zinke, Patrick Bakenecker, Daniel Hahn
The clothing manufacturer Venex Life-Science tracks the strategy to enhance recovery process through implementing platinum harmonized technology (PHT) into their Venex® Regeneration Wear. The proposed mechanisms of the regeneration wear are an increase of parasympathetic activity and an increase of the temperature due far-infrared radiation. The purpose of this study was to investigate potential effects of Venex regeneration wear on the recovery of neuromuscular, systemic and subjective parameters following exercise...
2017: PloS One
https://www.readbyqxmd.com/read/29021762/massage-alleviates-delayed-onset-muscle-soreness-after-strenuous-exercise-a-systematic-review-and-meta-analysis
#7
REVIEW
Jianmin Guo, Linjin Li, Yuxiang Gong, Rong Zhu, Jiake Xu, Jun Zou, Xi Chen
Purpose: The purpose of this systematic review and meta-analysis was to evaluate the effects of massage on alleviating delayed onset of muscle soreness (DOMS) and muscle performance after strenuous exercise. Method: Seven databases consisting of PubMed, Embase, EBSCO, Cochrane Library, Web of Science, CNKI and Wanfang were searched up to December 2016. Randomized controlled trials (RCTs) were eligible and the outcomes of muscle soreness, performance (including muscle maximal isometric force (MIF) and peak torque) and creatine kinase (CK) were used to assess the effectiveness of massage intervention on DOMS...
2017: Frontiers in Physiology
https://www.readbyqxmd.com/read/29016397/feasibility-and-reliability-of-functional-muscle-tests-in-lung-transplant-recipients
#8
Thomas Kienbacher, Grace Achim-Gunacker, Melanie Pachner, Katharina Kerschan-Schindl, Patrik Gunacker, Richard Habenicht, Walter Klepetko, Peter Jaksch, Stephan Doblhammer, Gerold Ebenbichler
OBJECTIVE: This study investigates the feasibility, reliability, and correlations of recommended functional tests in lung transplant recipients shortly after surgery. DESIGN: Observational study METHODS: 50 patients (28 females) performed well standardized maximum isometric back extension in a sitting position, hand grip strength, and Biering-Sørensen endurance tests shortly before discharge from the acute hospital, shortly thereafter, and two months later following subacute rehabilitation...
October 10, 2017: American Journal of Physical Medicine & Rehabilitation
https://www.readbyqxmd.com/read/28987643/blood-flow-restricted-resistance-training-in-older-adults-at-risk-of-mobility-limitations
#9
Summer B Cook, Dain P LaRoche, Michelle R Villa, Hannah Barile, Todd M Manini
High-load resistance training (HL) may be contraindicated in older adults due to pre-existing health conditions (e.g. osteoarthritis). Low-load blood flow restricted (BFR) resistance training offers an alternative to HL with potentially similar strength improvement. PURPOSE: To compare muscle strength, cross-sectional area (CSA), physical function, and quality of life (QOL) following 12-weeks of HL or BFR training in older adults at risk of mobility limitations. METHODS: Thirty-six males and females (mean: 75...
October 5, 2017: Experimental Gerontology
https://www.readbyqxmd.com/read/28985238/the-pain-threshold-of-high-threshold-mechanosensitive-receptors-subsequent-to-maximal-eccentric-exercise-is-a-potential-marker-in-the-prediction-of-doms-associated-impairment
#10
Johannes Fleckenstein, Perikles Simon, Matthias König, Lutz Vogt, Winfried Banzer
BACKGROUND: Delayed-onset muscle soreness (DOMS) refers to dull pain and discomfort in people after participating in exercise, sport or recreational physical activities. The aim of this study was to detect underlying mechanical thresholds in an experimental model of DOMS. METHODS: Randomised study to detect mechanical pain thresholds in a randomised order following experimentally induced DOMS of the non-dominant arm in healthy participants. Main outcome was the detection of the pressure pain threshold (PPT), secondary thresholds included mechanical detection (MDT) and pain thresholds (MPT), pain intensity, pain perceptions and the maximum isometric voluntary force (MIVF)...
2017: PloS One
https://www.readbyqxmd.com/read/28979160/preconditioning-by-light-load-eccentric-exercise-is-equally-effective-as-low-level-laser-therapy-in-attenuating-exercise-induced-muscle-damage-in-collegiate-men
#11
Samar Nausheen, Jamal Ali Moiz, Shahid Raza, Mohammad Yakub Shareef, Shahnawaz Anwer, Ahmad H Alghadir
BACKGROUND/OBJECTIVE: Previous studies have already reported an independent effect of light-load eccentric exercise (10% eccentric exercise contraction [EEC]) and low-level laser therapy (LLLT) as a protective measure against more strenuous eccentric exercise. However, the difference between these two interventions is largely unknown. Therefore, the present study aimed to compare the preconditioning effect of 10% EEC vs. LLLT on subjective, physiological, and biochemical markers of muscle damage in elbow flexors in collegiate men...
2017: Journal of Pain Research
https://www.readbyqxmd.com/read/28974931/muscle-tendon-unit-properties-during-eccentric-exercise-correlate-with-the-creatine-kinase-response
#12
Kirsty M Hicks, Gladys L Onambele-Pearson, Keith Winwood, Christopher I Morse
Aim: The aim of this paper was to determine whether; (1) patella tendon stiffness, (2) the magnitude of vastus lateralis fascicle lengthening, and (3) eccentric torque correlate with markers of exercise induced muscle damage. Method: Combining dynamometry and ultrasonography, patella tendon properties and vastus lateralis architectural properties were measured pre and during the first of six sets of 12 maximal voluntary eccentric knee extensions. Maximal isometric torque loss and creatine kinase activity were measured pre-damage (-48 h), 48, 96, and 168 h post-damage as markers of exercise-induced muscle damage...
2017: Frontiers in Physiology
https://www.readbyqxmd.com/read/28971551/exercise-induced-effects-on-muscle-function-and-range-of-motion-in-patients-with-hip-osteoarthritis
#13
Theresa Bieler, Volkert Siersma, S Peter Magnusson, Michael Kjaer, Nina Beyer
BACKGROUND AND PURPOSE: Patients with hip osteoarthritis have impairments in muscle function (muscle strength and power) and hip range of motion (ROM), and it is commonly believed that effective clinical management of osteoarthritis should address these impairments to reduce pain and disability. Therefore, the purpose of this study was to compare the short- and long-term effects of 4 months of physiotherapist-supervised strength training, physiotherapist-supervised Nordic Walking (NW), or unsupervised home-based exercise (HBE) on muscle function and hip ROM in patients diagnosed with hip osteoarthritis...
October 3, 2017: Physiotherapy Research International: the Journal for Researchers and Clinicians in Physical Therapy
https://www.readbyqxmd.com/read/28964826/randomized-four-arm-dose-response-clinical-trial-to-optimize-resistance-exercise-training-for-older-adults-with-age-related-muscle-atrophy
#14
Michael J Stec, Anna Thalacker-Mercer, David L Mayhew, Neil A Kelly, S Craig Tuggle, Edward K Merritt, Cynthia J Brown, Samuel T Windham, Louis J Dell'Italia, C Scott Bickel, Brandon M Roberts, Kristina M Vaughn, Irina Isakova-Donahue, Gina M Many, Marcas M Bamman
PURPOSE: The myriad consequences of age-related muscle atrophy include reduced muscular strength, power, and mobility; increased risk of falls, disability, and metabolic disease; and compromised immune function. At its root, aging muscle atrophy results from a loss of myofibers and atrophy of the remaining type II myofibers. The purpose of this trial (NCT02442479) was to titrate the dose of resistance training (RT) in older adults in an effort to maximize muscle regrowth and gains in muscle function...
September 28, 2017: Experimental Gerontology
https://www.readbyqxmd.com/read/28956640/are-higher-blood-flow-restriction-pressures-more-beneficial-when-lower-loads-are-used
#15
S J Dankel, M B Jessee, S L Buckner, J G Mouser, K T Mattocks, J P Loenneke
The application of blood flow restriction during low-load resistance exercise has been shown to induce muscle growth with high or low restriction pressures, however, loads lower than 20% one-repetition maximum (1RM) remain unexplored. Fourteen trained individuals completed six elbow flexion protocols involving three different loads (10%, 15%, and 20% 1RM) each of which was performed with either a low (40% arterial occlusion) or high (80% arterial occlusion) pressure. Pre- and post-measurements of surface electromyography (sEMG), isometric torque, and muscle thickness were analyzed...
September 1, 2017: Physiology International
https://www.readbyqxmd.com/read/28952863/calculation-of-resistive-loads-for-elastic-resistive-exercises
#16
Kelsey Picha, Tim Uhl
CONTEXT: What is the correct resistive load to start resistive training with elastic resistance to gain strength? This question is typically answered by the clinician's best estimate and patient's level of discomfort without objective evidence. OBJECTIVE: To determine the average level of resistance to initiate a strengthening routine with elastic resistance following isometric strength testing. DESIGN: Cohort. SETTING: Clinical...
September 27, 2017: Journal of Sport Rehabilitation
https://www.readbyqxmd.com/read/28945641/four-weeks-of-finger-grip-training-increases-the-rate-of-force-development-and-the-maximal-force-in-elite-and-world-top-ranking-climbers
#17
Guillaume Levernier, Guillaume Laffaye
The goal of this study was to assess the impact of a specific four-week training program on finger grip in climbers; specifically, on the maximal force and the rate of force development (RFD) of finger muscles in isometric contraction. The participants were 14 French male rock climbers who took part in national and international bouldering competitions (at world-ranking and elite levels). They were divided into two samples. The experimental group performed a specific four-week training program that included such exercises as suspensions on small holds at the rate of three times a week...
September 19, 2017: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/28937254/assessing-muscular-oxygenation-during-incremental-exercise-using-near-infrared-spectroscopy-comparison-of-three-different-methods
#18
N F Agbangla, M Audiffren, C T Albinet
Using continuous-wave near-infrared spectroscopy (NIRS), this study compared three different methods, namely the slope method (SM), the amplitude method (AM), and the area under the curve (AUC) method to determine the variations of intramuscular oxygenation level as a function of workload. Ten right-handed subjects (22+/-4 years) performed one isometric contraction at each of three different workloads (30%, 50% and 90% of maximal voluntary strength) during a period of twenty seconds. Changes in oxyhemoglobin (delta[HbO(2)]) and deoxyhemoglobin (delta[HHb]) concentrations in the superficial flexor of fingers were recorded using continuous-wave NIRS...
September 22, 2017: Physiological Research
https://www.readbyqxmd.com/read/28936703/cross-education-of-muscular-strength-following-unilateral-resistance-training-a-meta-analysis
#19
A Manca, D Dragone, Z Dvir, Franca Deriu
PURPOSE: Cross-education (CE) of strength is a well-known phenomenon whereby exercise of one limb can induce strength gains in the contralateral untrained limb. The only available meta-analyses on CE, which date back to a decade ago, estimated a modest 7.8% increase in contralateral strength following unilateral training. However, in recent years new evidences have outlined larger contralateral gains, which deserve to be systematically evaluated. Therefore, the aim of this meta-analysis was to appraise current data on CE and determine its overall magnitude of effect...
November 2017: European Journal of Applied Physiology
https://www.readbyqxmd.com/read/28934100/differences-in-the-movement-skills-and-physical-qualities-of-elite-senior-academy-rugby-league-players
#20
Matthew R E Ireton, Kevin Till, Dan Weaving, Ben Jones
The aim of the present study was to investigate (a) the differences in the movement skills and physical qualities between academy and senior rugby league players, and (b) the relationships between movement skills and physical qualities. Fifty-five male rugby league players (Senior, n=18; Under 19 n=23; Under 16, n=14) undertook a physical testing battery including anthropometric (stature & body mass), strength (isometric mid-thigh pull; IMTP) and power (countermovement jump; CMJ) qualities, alongside the athletic ability assessment (AAA; comprised of overhead squat, double lunge, single-leg Romanian deadlift, press-up and pull-up exercises)...
June 2, 2017: Journal of Strength and Conditioning Research
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