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Isometric exercise

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https://www.readbyqxmd.com/read/29239993/hypoxia-during-resistance-exercise-does-not-affect-physical-performance-perceptual-responses-or-neuromuscular-recovery
#1
Brendan R Scott, Katie M Slattery, Dean V Sculley, Ben J Dascombe
This study aimed to determine whether performing resistance exercise in hypoxia affects markers of physical performance, perceptual responses, and neuromuscular function. Fourteen male subjects (age: 24.6 ± 2.7 yr; height: 179.7 ± 5.9 cm; body mass: 84.6 ± 11.6 kg) with >2 years resistance training experience performed moderate-load resistance exercise in two conditions; normoxia (FIO2 = 0.21) and hypoxia (FIO2 = 0.16). Resistance exercise comprised 3 sets of 10 repetitions of back squats and deadlifts at 60% of 1RM, with 60s inter-set rest...
December 11, 2017: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/29238262/effect-of-upper-extremity-strengthening-exercises-on-the-lumbar-strength-disability-and-pain-of-patients-with-chronic-low-back-pain-a-randomized-controlled-study
#2
Erdem Atalay, Bedrettin Akova, Hakan Gür, Ufuk Sekir
The present study aimed to analyze the impacts of a low back rehabilitation program accompanied with neck, shoulder and upper back exercises on pain, disability, and physical characteristics of patients with chronic low back pain. Twenty sedentary male patients with chronic low back pain participated in the study on a voluntary basis. The patients were randomly allocated into two groups: a conventional low back exercise group (CE) and a supported exercise group (SE; CE plus upper back, neck, and shoulder exercises)...
December 2017: Journal of Sports Science & Medicine
https://www.readbyqxmd.com/read/29238246/preventive-and-regenerative-foam-rolling-are-equally-effective-in-reducing-fatigue-related-impairments-of-muscle-function-following-exercise
#3
Johannes Fleckenstein, Jan Wilke, Lutz Vogt, Winfried Banzer
Objectives of the study were to compare the effects of a single bout of preventive or regenerative foam rolling (FR) on exercise-induced neuromuscular exhaustion. Single-centre randomised-controlled study was designed. Forty-five healthy adults (22 female; 25±2 yrs) were allocated to three groups: 1) FR of the lower limb muscles prior to induction of fatigue, 2) FR after induction of fatigue, 3) no-treatment control. Neuromuscular exhaustion was provoked using a standardized and validated functional agility short-term fatigue protocol...
December 2017: Journal of Sports Science & Medicine
https://www.readbyqxmd.com/read/29234284/the-efficacy-of-wrestling-style-compression-suits-to-improve-maximum-isometric-force-and-movement-velocity-in-well-trained-male-rugby-athletes
#4
Daniel T McMaster, Christopher M Beaven, Brad Mayo, Nicholas Gill, Kim Hébert-Losier
Purpose: The prevalence of compression garment (CG) use is increasing with athletes striving to take advantage of the purported benefits to recovery and performance. Here, we investigated the effect of CG on muscle force and movement velocity performance in athletes. Methods: Ten well-trained male rugby athletes wore a wrestling-style CG suit applying 13-31 mmHg of compressive pressure during a training circuit in a repeated-measures crossover design. Force and velocity data were collected during a 5-s isometric mid-thigh pull (IMTP) and repeated countermovement jump (CMJ), respectively; and time to complete a 5-m horizontal loaded sled push was also measured...
2017: Frontiers in Physiology
https://www.readbyqxmd.com/read/29233666/emg-amplitude-fatigue-threshold-and-time-to-task-failure-a-meta-analysis
#5
REVIEW
J Matt McCrary, Bronwen J Ackermann, Mark Halaki
OBJECTIVES: Electromyographic (EMG) fatigue threshold (EMGFT) is utilised as a correlate of critical power, torque, and force thresholds that establishes a theoretical exercise intensity-the power, torque, or force at which the rate of change of EMG amplitude (ΔEM¯G) is zero-below which neuromuscular fatigue is negligible and unpredictable. Recent studies demonstrating neuromuscular fatigue below critical thresholds raise questions about the construct validity of EMGFT. The purpose of this analysis is to evaluate the construct validity of EMGFT by aggregating ΔEM¯G and time to task failure (Tlim) data...
November 11, 2017: Journal of Science and Medicine in Sport
https://www.readbyqxmd.com/read/29231243/neuromuscular-electrical-stimulation-nmes-for-patellofemoral-pain-syndrome
#6
REVIEW
Ana Luiza C Martimbianco, Maria Regina R Torloni, Brenda Ng Andriolo, Gustavo Jm Porfírio, Rachel Riera
BACKGROUND: Patellofemoral pain syndrome, now generally referred to as patellofemoral pain (PFP), is one of the most common orthopaedic disorders, characterised by pain in the anterior or retropatellar knee region. Neuromuscular electrical stimulation (NMES) has been proposed generally as a complementary treatment, associated with other interventions such as exercise, or as a single treatment to increase muscle force, reduce knee pain, and improve function. OBJECTIVES: To assess the effects (benefits and harms) of neuromuscular electrical stimulation for people with patellofemoral pain...
December 12, 2017: Cochrane Database of Systematic Reviews
https://www.readbyqxmd.com/read/29216898/is-the-relationship-between-increased-knee-muscle-strength-and-improved-physical-function-following-exercise-dependent-on-baseline-physical-function-status
#7
Michelle Hall, Rana S Hinman, Martin van der Esch, Marike van der Leeden, Jessica Kasza, Tim V Wrigley, Ben R Metcalf, Fiona Dobson, Kim L Bennell
BACKGROUND: Clinical guidelines recommend knee muscle strengthening exercises to improve physical function. However, the amount of knee muscle strength increase needed for clinically relevant improvements in physical function is unclear. Understanding how much increase in knee muscle strength is associated with improved physical function could assist clinicians in providing appropriate strength gain targets for their patients in order to optimise outcomes from exercise. The aim of this study was to investigate whether an increase in knee muscle strength is associated with improved self-reported physical function following exercise; and whether the relationship differs according to physical function status at baseline...
December 8, 2017: Arthritis Research & Therapy
https://www.readbyqxmd.com/read/29216288/adaptations-in-antagonist-co-activation-role-in-the-repeated-bout-effect
#8
Robert E Hight, Travis W Beck, Debra A Bemben, Christopher D Black
Eccentric exercise results in an adaptation which attenuates muscle damage from subsequent exercise-termed the "repeated-bout effect (RBE)." PURPOSE: Study examined antagonist co-activation and motor-unit recruitment strategy, assessed via dEMG, concomitant to the RBE. METHODS: Nine participants performed 5 sub-maximal isometric trapezoid (ramp-up, hold, ramp-down) contractions at force levels corresponding to 50% and 80% of maximal isometric strength (MVC). Surface EMG signals of the biceps brachii were decomposed into individual motor-unit action potential trains...
2017: PloS One
https://www.readbyqxmd.com/read/29214462/the-use-of-the-cr-10-scale-to-allow-self-regulation-of-isometric-exercise-intensity-in-pre-hypertensive-and-hypertensive-participants
#9
Niamh M Morrin, Mark R Stone, Ian L Swaine, Keiran J Henderson
PURPOSE: Isometric exercise (IE) has been shown to lower blood pressure (BP). Using equipment with force output displays, intensity is usually regulated at 30% maximal voluntary contraction (MVC); however, the cost of programmable equipment and their requirement for maximal contractions presents limitations. A simple, cost-effective alternative deserves investigation. The purpose of this study was (1) to explore the relationship between %MVC, change in systolic BP (ΔSBP), and perceived exertion (CR-10) and (2) to assess the validity of self-regulation of intensity during isometric hand-grip exercise...
December 6, 2017: European Journal of Applied Physiology
https://www.readbyqxmd.com/read/29214392/modulation-of-specific-inhibitory-networks-in-fatigued-locomotor-muscles-of-healthy-males
#10
Stuart Goodall, Glyn Howatson, Kevin Thomas
Reduced maximal force capability of skeletal muscle, as a consequence of exercise, can be due to peripheral or central fatigue mechanisms. In upper-limb muscles, neuromuscular fatigue is concurrent with reduced corticospinal excitability and increased inhibition (lengthened corticospinal silent period [CSP]; reduced short-interval intracortical inhibition [SICI] ratio). However, it is unclear whether these adjustments occur in response to fatiguing exercise of locomotor muscles. This study examined the effect of fatiguing, maximal, knee-extensor exercise on motor cortical excitability and inhibition...
December 6, 2017: Experimental Brain Research. Experimentelle Hirnforschung. Expérimentation Cérébrale
https://www.readbyqxmd.com/read/29212849/trim63-murf-1-gene-polymorphism-is-associated-with-biomarkers-of-exercise-induced-muscle-damage
#11
Philipp Baumert, Mark J Lake, Barry Drust, Claire Stewart, Robert M Erskine
Unaccustomed strenuous exercise can lead to muscle strength loss, inflammation and delayed onset muscle soreness, which may be influenced by genetic variation. We investigated if a missense single nucleotide polymorphism (A>G, rs2275950) within the TRIM63 gene (encoding MuRF-1 and potentially affecting titin mechanical properties) was associated with the variable response to unaccustomed eccentric exercise. Sixty-five untrained, healthy participants (genotyped for rs2275950: AA, AG and GG) performed 120 maximal eccentric knee extensions (ECC) to induce muscle damage...
December 6, 2017: Physiological Genomics
https://www.readbyqxmd.com/read/29210934/a-scoping-review-of-physical-performance-outcome-measures-used-in-exercise-interventions-for-older-adults-with-alzheimer-disease-and-related-dementias
#12
Ellen L McGough, Shih-Yin Lin, Basia Belza, Katie M Becofsky, Dina L Jones, Minhui Liu, Sara Wilcox, Rebecca G Logsdon
BACKGROUND AND PURPOSE: There is growing evidence that exercise interventions can mitigate functional decline and reduce fall risk in older adults with Alzheimer disease and related dementias (ADRD). Although physical performance outcome measures have been successfully used in older adults without cognitive impairment, additional research is needed regarding their use with individuals who have ADRD, and who may have difficulty following instructions regarding performance of these measures...
November 28, 2017: Journal of Geriatric Physical Therapy
https://www.readbyqxmd.com/read/29210775/isometric-exercise-to-reduce-pain-in-patellar-tendinopathy-in-season-is-it-effective-on-the-road
#13
Ebonie Rio, Craig Purdam, Michael Girdwood, Jill Cook
OBJECTIVE: To investigate the effectiveness of an isometric squat exercise using a portable belt, on patellar tendon pain and function, in athletes during their competitive season. DESIGN: Case series with no requirements to change any aspect of games or training. The object of this pragmatic study was to investigate this intervention in addition to "usual management." A control or sham intervention was considered unacceptable to teams. SETTING: In-season...
November 27, 2017: Clinical Journal of Sport Medicine: Official Journal of the Canadian Academy of Sport Medicine
https://www.readbyqxmd.com/read/29207251/oral-contraceptives-modulate-the-muscle-metaboreflex-in-healthy-young-women
#14
Hanna R Parmar, Jasmin Sears, Yannick Molgat-Seon, Cara L McCulloch, Laura A McCracken, Courtney V Brown, Andrew William Sheel, Paolo B Dominelli
There are known sex-differences in blood pressure regulation. The differences are related to ovarian hormones that influence β-adrenergic receptors and the transduction of muscle sympathetic nerve activity. Oral contraceptives (OC) modulate the ovarian hormonal profile in women and therefore may alter the cardiovascular response. We questioned if OC would alter the absolute pressor response to static exercise and influence the day-to-day variability of the response. Healthy men (n=11) and women (n=19) completed a familiarization day and two experimental testing days...
December 5, 2017: Applied Physiology, Nutrition, and Metabolism, Physiologie Appliquée, Nutrition et Métabolisme
https://www.readbyqxmd.com/read/29202311/quantitative-sensory-response-of-the-scm-muscle-on-sustained-low-level-activation-simulating-co-contractions-during-bruxing
#15
Lydia Eberhard, Sophia Terebesi, Nikolaos Nikitas Giannakopoulos, Daniel Hellmann, Hans-Jürgen Schindler, Marc Schmitter, Doreen Pfau
OBJECTIVE: Bruxism is discussed as an etiological factor in the pathogenesis of orofacial and cervical pain. As the sternocleidomastoid muscle (SCM) is co-activated during clenching, our aim was to investigate, whether the muscle loading leads to peripheral or central sensitizations. DESIGN: In twenty-one healthy female volunteers, somatosensory profiles of the SCM were recorded according to the test battery of the German Research Network on Neuropathic Pain (DFNS) prior to and after an isometric muscle exercise...
November 10, 2017: Archives of Oral Biology
https://www.readbyqxmd.com/read/29194762/cholinesterase-levels-predict-exercise-capacity-in-cardiac-recipients-early-after-transplantation
#16
Kazufumi Kitagaki, Michio Nakanishi, Rei Ono, Kazuya Yamamoto, Yuji Suzuki, Noriyuki Fukui, Hidetoshi Yanagi, Harumi Konishi, Masanobu Yanase, Norihide Fukushima
PURPOSE: Although cardiac rehabilitation is recommended for patients early after heart transplantation (HTx), adequate exercise effect cannot always be obtained, partly because in patients with chronic heart failure, exercise capacity is reduced due to malnutrition during waiting for HTx. This study aimed to investigate the relationships between exercise capacity and clinical variables, including nutritional indicators, early after HTx. PATIENTS AND METHODS: Forty three HTx recipients were studied...
December 1, 2017: Clinical Transplantation
https://www.readbyqxmd.com/read/29189339/a-prospective-randomized-controlled-trial-comparing-conservative-treatment-with-trunk-stabilization-exercise-to-standard-hip-muscle-exercise-for-treating-femoroacetabular-impingement-a-pilot-study
#17
Michihisa Aoyama, Yasuo Ohnishi, Hajime Utsunomiya, Shiho Kanezaki, Hiroki Takeuchi, Makoto Watanuki, Dean K Matsuda, Soshi Uchida
OBJECTIVE: To assess the efficacy of conservative management of women with femoroacetabular impingement (FAI) using trunk stabilization. DESIGN: Randomized controlled trial (level of evidence: I). SUBJECTS: Twenty FAI female patients who met the inclusion FAI criteria. METHODS: A prospective, randomized, controlled study was performed on 20 female patients with symptomatic FAI comprising 2 groups (10 hips in trunk stabilization exercise group vs 10 hips in control group)...
November 16, 2017: Clinical Journal of Sport Medicine: Official Journal of the Canadian Academy of Sport Medicine
https://www.readbyqxmd.com/read/29189308/lactotripeptides-supplementations-alleviate-the-decrease-in-maximal-isometric-force-following-high-intensity-eccentric-exercise-a-randomized-placebo-controlled-double-blinded-clinical-trial
#18
Kaname Tagawa, Song-Gyu Ra, Youngju Choi, Seiji Maeda
OBJECTIVE: To investigate whether lactotripeptides (LTP) supplementations alleviate the decrease in the maximal isometric force (MIF), an indirect marker of muscle damage, following eccentric exercise (ECC). DESIGN: Twenty-two young men performed 50-ECC of the elbow flexors using an isokinetic dynamometer. The subjects were randomly assigned to either the placebo or LTP group, and were each given a 4.5 mg/day placebo or LTP three-time on the exercise day and the day after...
November 20, 2017: American Journal of Physical Medicine & Rehabilitation
https://www.readbyqxmd.com/read/29184295/effects-of-jaw-opening-exercise-on-aspiration-in-stroke-patients-with-dysphagia-a-pilot-study
#19
Dong-Hwan Oh, Jung-Hee Won, Young-A Kim, Won-Jin Kim
[Purpose] The purpose of this study was to investigate the effect of jaw opening exercise (JOE) on aspiration in patients with dysphagia after stroke. [Subjects and Methods] Three subjects were recruited. Isometric and isotonic JOE were performed using a rubber ball, 5 days a week for 4 weeks. Aspiration was evaluated using the penetration-a spiration scale (PAS) based on a videofluoroscopic swallowing study. [Results] All subjects showed a score reduction of at least 1 point and a maximum reduction of 2 points in the PAS in the liquid type...
October 2017: Journal of Physical Therapy Science
https://www.readbyqxmd.com/read/29180484/repeated-bouts-of-resistance-exercise-with-short-recovery-periods-activates-mtor-signaling-but-not-protein-synthesis-in-mouse-skeletal-muscle
#20
Junya Takegaki, Riki Ogasawara, Yuki Tamura, Ryo Takagi, Yuki Arihara, Arata Tsutaki, Koichi Nakazato, Naokata Ishii
The recovery period between bouts of exercise is one of the major factors influencing the effects of resistance exercise, in addition to exercise intensity and volume. However, the effects of shortening the recovery time between bouts of resistance exercise on subsequent protein synthesis remain unclear. In this study, we investigated the consequences of shortening the recovery time between bouts of resistance exercise on protein synthesis and related processes in mouse skeletal muscles. Eighteen male C57BL/6J mice were randomly subjected to three bouts of resistance exercise with 72 (72H), 24 (24H), or 8 h (8H) of recovery periods between bouts...
November 2017: Physiological Reports
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