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https://www.readbyqxmd.com/read/28728077/comparison-of-spinal-stability-following-motor-control-and-general-exercises-in-nonspecific-chronic-low-back-pain-patients
#1
MohammadBagher Shamsi, Javad Sarrafzadeh, Aliashraf Jamshidi, Navid Arjmand, Farshid Ghezelbash
BACKGROUND: Motor control exercise was claimed to improve spinal stability in patients with chronic non-specific back pain, but to investigate the effectiveness of this exercise, other outcome measures have been used rather than spinal stability itself. The aim of our study is to assess motor control exercise effects on spinal stability using a biomechanical model. METHODS: Fifty-one patients were assigned to either motor control or general exercises. Before and after trainings, participants were tested for spinal stability at seven isometric tasks...
July 8, 2017: Clinical Biomechanics
https://www.readbyqxmd.com/read/28725437/towards-evidence-based-strength-training-a-comparison-of-muscle-forces-during-deadlifts-goodmornings-and-split-squats
#2
Florian Schellenberg, William R Taylor, Silvio Lorenzetti
BACKGROUND: To ensure an efficient and targeted adaptation with low injury risk during strength exercises, knowledge of the participant specific internal loading conditions is essential. The goal of this study was to calculate the lower limb muscles forces during the strength exercises deadlifts, goodmornings and splits squats by means of musculoskeletal simulation. METHODS: 11 participants were assessed performing 10 different variations of split squats by varying the step length as well as the maximal frontal tibia angle, and 13 participants were measured performing deadlift and goodmorning exercises...
2017: BMC Sports Science, Medicine and Rehabilitation
https://www.readbyqxmd.com/read/28725197/skeletal-muscle-remodeling-in-response-to-eccentric-vs-concentric-loading-morphological-molecular-and-metabolic-adaptations
#3
REVIEW
Martino V Franchi, Neil D Reeves, Marco V Narici
Skeletal muscle contracts either by shortening or lengthening (concentrically or eccentrically, respectively); however, the two contractions substantially differ from one another in terms of mechanisms of force generation, maximum force production and energy cost. It is generally known that eccentric actions generate greater force than isometric and concentric contractions and at a lower metabolic cost. Hence, by virtue of the greater mechanical loading involved in active lengthening, eccentric resistance training (ECC RT) is assumed to produce greater hypertrophy than concentric resistance training (CON RT)...
2017: Frontiers in Physiology
https://www.readbyqxmd.com/read/28721747/faster-v%C3%AC-o2-kinetics-after-priming-exercises-of-different-duration-but-same-fatigue
#4
Felipe Mattioni Maturana, Arthur Peyrard, John Temesi, Guillaume Y Millet, Juan M Murias
This study compared the responses of two priming exercises of similar fatigue on the adjustment of the oxygen uptake time constant (τV̇O2) in cycling. Ten healthy young adults (25 ± 3 yr) performed: three step transitions from a 20-W baseline to the power output (PO) below the gas exchange threshold (MOD, MODPRE); a 3-min bout (P3MIN) at 90% of peak PO (POpeak), followed by MOD (MOD3MIN); and a 6-min bout (P6MIN) at 80% of POpeak, followed by MOD (MOD6MIN). The O2 supply-to-O2 demand ([HHb]/V̇O2) ratio was calculated for MODPRE, MOD3MIN, and MOD6MIN...
July 19, 2017: Journal of Sports Sciences
https://www.readbyqxmd.com/read/28721030/regular-physical-exercise-improves-cardiac-autonomic-and-muscle-vasodilatory-responses-to-isometric-exercise-in-healthy-elderly
#5
Adriana de Oliveira Sarmento, Amilton da Cruz Santos, Ivani Credidio Trombetta, Marciano Moacir Dantas, Ana Cristina Oliveira Marques, Leone Severino do Nascimento, Bruno Teixeira Barbosa, Marcelo Rodrigues Dos Santos, Maria do Amparo Andrade, Anna Myrna Jaguaribe-Lima, Maria do Socorro Brasileiro-Santos
The objective of this study was to evaluate cardiac autonomic control and muscle vasodilation response during isometric exercise in sedentary and physically active older adults. Twenty healthy participants, 10 sedentary and 10 physically active older adults, were evaluated and paired by gender, age, and body mass index. Sympathetic and parasympathetic cardiac activity (spectral and symbolic heart rate analysis) and muscle blood flow (venous occlusion plethysmography) were measured for 10 minutes at rest (baseline) and during 3 minutes of isometric handgrip exercise at 30% of the maximum voluntary contraction (sympathetic excitatory maneuver)...
2017: Clinical Interventions in Aging
https://www.readbyqxmd.com/read/28720871/localization-of-damage-in-the-human-leg-muscles-induced-by-downhill-running
#6
Sumiaki Maeo, Yukino Ando, Hiroaki Kanehisa, Yasuo Kawakami
We investigated localization of damage within the knee extensors (KEs) and plantar flexors (PFs) induced by downhill running (DR) by using transverse relaxation time (T2)-weighted magnetic resonance imaging (MRI). Fourteen young adults performed 45-min DR (-15% slope) at their maximal tolerable velocity. At pre- and 24, 48, and 72 h post-exercise, T2-MRI was scanned and T2 values for each muscle composing KEs and PFs at proximal, middle, and distal sites were calculated. Maximal isometric torque and rate of torque development (RTD: 0-30, 0-50, 0-100, 0-200 ms) were also measured...
July 18, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28719765/beetroot-juice-is-more-beneficial-than-sodium-nitrate-for-attenuating-muscle-pain-after-strenuous-eccentric-bias-exercise
#7
Tom Clifford, Glyn Howatson, Daniel J West, Emma J Stevenson
The aim of this study was to compare the effects of beetroot juice (BTJ) and a nitrate only drink (sodium nitrate; SN) on indices of exercise-induced muscle damage (EIMD). Thirty recreationally active males consumed either BTJ (n=10), a nitrate matched SN drink (n=10) or an isocaloric placebo (PLA; n=10) immediately, 24 and 48 h after performing 100 drop jumps. To assess muscle damage, maximal isometric voluntary contractions (MIVC), countermovement jumps (CMJ), pressure-pain threshold (PPT), creatine kinase (CK) and high sensitivity C-reactive protein (hs-CRP) were measured pre, immediately post, 24, 48 and 72 h following the drop jumps...
July 18, 2017: Applied Physiology, Nutrition, and Metabolism, Physiologie Appliquée, Nutrition et Métabolisme
https://www.readbyqxmd.com/read/28718344/knee-extensor-fatigue-developed-during-high-intensity-exercise-limits-lower-limb-power-production
#8
Steven J O'bryan, François Billaut, Janet L Taylor, David M Rouffet
We investigated the association between changes in vastii electromyography (EMG) and knee extensor fatigue during high-intensity cycling, and the subsequent effect on lower-limb power and intermuscular coordination during all-out cycling. On two separate days, participants completed 30-s all-out cycling or 10-min of high-intensity cycling followed by 30-s all-out cycling. EMG for gluteus maximus (GMAX), rectus femoris (RF), vastii (VAS), hamstrings (HAM) and gastrocnemius (GAS); co-activation for GMAX/RF, VAS/HAM and VAS/GAS; isometric maximal voluntary force (IMVF) and resting twitch (RT) of the knee extensors were measured...
July 18, 2017: Journal of Sports Sciences
https://www.readbyqxmd.com/read/28718320/oral-prednisolone-for-4-days-does-not-increase-exercise-tolerance-in-men-with-copd
#9
S L Karlsson, V Backer, Nina Skavlan Godtfredsen
One of the primary objectives in management of chronic obstructive pulmonary disease (COPD) is preventing decrease in lung function and reducing the annual number of acute exacerbations of COPD (AECOPD). An oral course of systemic corticosteroids is a commonly used treatment in AECOPD. We hypothesize that this treatment also increases exercise performance and decreases muscle fatigue. In a randomized double-blinded, parallel, placebo-controlled trial, we investigated 14 men (8 on prednisolone 37.5 mg vs. 6 on placebo) with severe and very severe COPD...
January 1, 2017: Chronic Respiratory Disease
https://www.readbyqxmd.com/read/28717347/effect-of-eicosapentaenoic-acids-rich-fish-oil-supplementation-on-motor-nerve-function-after-eccentric-contractions
#10
Eisuke Ochi, Yosuke Tsuchiya, Kenichi Yanagimoto
BACKGROUND: This study investigated the effect of supplementation with fish oil rich in eicosapentaenoic acid (EPA) and docosahexaenoic acid (DHA) on the M-wave latency of biceps brachii and muscle damage after a single session of maximal elbow flexor eccentric contractions (ECC). METHODS: Twenty-one men were completed the randomized, double-blind, placebo-controlled, and parallel-design study. The subjects were randomly assigned to the fish oil group (n = 10) or control group (n = 11)...
2017: Journal of the International Society of Sports Nutrition
https://www.readbyqxmd.com/read/28713460/effects-of-an-elastic-hamstring-assistance-device-during-downhill-running
#11
Randy L Aldret, Brittany A Trahan, Greggory Davis, Brian Campbell, David M Bellar
The purpose of this study was to determine the appropriateness of using an elastic hamstring assistance device to reduce perceived levels of soreness, increase isometric strength, increase passive range of motion, and decrease biomarkers of muscle damage after eccentric exercise, specifically, downhill running This study was conducted in a university exercise physiology laboratory placing sixteen apparently healthy males (X = 21.6 ± 2.5 years) into two groups using a pre-test/post-test design. Pre-intervention measures taken included participants' body height, body mass, body fat, capillary blood samples, VO2max, isometric hamstring strength at 45 and 90 degrees of flexion and passive hamstring range of motion...
June 2017: Journal of Human Kinetics
https://www.readbyqxmd.com/read/28708775/continuous-cardiac-autonomic-and-hemodynamic-responses-to-isometric-exercise
#12
Katrina A Taylor, Jonathan D Wiles, Damian D Coleman, Rajan Sharma, Jamie M Oʼdriscoll
PURPOSE: Elevated arterial blood pressure (BP) is associated with autonomic dysfunction and impaired hemodynamic control mechanisms. Isometric exercise (IE) training has been demonstrated effective at reducing BP; however, the continuous cardiovascular responses during IE are underinvestigated. We hypothesized that reflex autonomic cardiovascular control is an important mediator in reducing BP. To test our hypothesis, we investigated continuous cardiac autonomic modulation and baroreceptor reflex sensitivity (BRS) in response to IE...
August 2017: Medicine and Science in Sports and Exercise
https://www.readbyqxmd.com/read/28704624/a-systematic-review-of-emg-studies-in-normal-shoulders-to-inform-postoperative-rehabilitation-following-rotator-cuff-repair
#13
Peter K Edwards, Jay R Ebert, Chris Littlewood, Tim Ackland, Allan Wang
Study Design Systematic review. Background Electromyography (EMG) has previously been used to guide postoperative rehabilitation progression following rotator cuff repair, to prevent deleterious loading of early surgical repair. Objective To review the current literature investigating EMG during rehabilitation exercises in normal shoulders, to identify exercises that meet a cut point of ≤15% maximal voluntary isometric contraction (MVIC) and unlikely to result in excessive loading in the early postoperative stages...
July 13, 2017: Journal of Orthopaedic and Sports Physical Therapy
https://www.readbyqxmd.com/read/28704311/acute-neuromuscular-and-endocrine-responses-to-two-different-compound-exercises-squat-versus-deadlift
#14
Matthew J Barnes, Adam Miller, Daniel Reeve, Robin Jc Stewart
Anecdotally, it is believed that the deadlift exercise brings about greater levels of central fatigue than other exercises; however no empirical evidence exists to support this view. Additionally, little is known about the acute endocrine response to heavy deadlift exercise and how this may differ to other similar compound exercises. Therefore, the aim of this study was to identify and compare the acute, neuromuscular and endocrine responses to squat and deadlift exercise. Ten resistance trained males completed 8 sets of 2 repetitions at 95 % of one repetition maximum...
July 12, 2017: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/28704193/rehabilitation-of-patients-with-hip-joint-arthroplasty-late-post-surgery-period-hospital-rehabilitation
#15
Maya S Krastanova, Elena M Ilieva, Danelina E Vacheva
BACKGROUND: Hip joint replacement (endoprosthesis, alloplasty) has become one of the most frequent surgery interventions of the 20th century. AIM: To conduct rehabilitation therapy in the late post-surgery period of hospital rehabilitation (45 days after surgery), to track patients' progress and measure the results. MATERIALS AND METHODS: One hundred and fifty-two patients with hip joint endoprosthesis were included in the study. All underwent surgery and rehabilitation at the Department of Clinical Rehabilitation of the Physical and Rehabilitation Medicine Clinic at Doctor G...
June 1, 2017: Folia Medica
https://www.readbyqxmd.com/read/28700018/peripheral-vascular-resistance-impairment-during-isometric-physical-exercise-in-normotensive-offspring-of-hypertensive-parents
#16
Natália Portela, Josária Ferraz Amaral, Pedro Augusto de Carvalho Mira, Livia Victorino de Souza, Daniel Godoy Martinez, Mateus Camaroti Laterza
Background: A family history of hypertension is associated with vascular and autonomic abnormalities, as well as an impaired neurohemodynamic response to exercise. Objective: To test the hypothesis that normotensive individuals with a family history of hypertension present an impaired peripheral vascular resistance response to exercise. Methods: The study included 37 normotensive volunteers of both sexes who were sedentary, eutrophic, and nonsmokers, comprising 23 with (FH+; 24 ± 3 years) and 14 without (FH-; 27 ± 5 years) a family history of hypertension...
July 10, 2017: Arquivos Brasileiros de Cardiologia
https://www.readbyqxmd.com/read/28685423/dorsiflexor-muscle-oxygenation-during-low-moderate-and-submaximal-sustained-isometric-contraction
#17
Adkham Paiziev, Martin Wolf, Fikrat Kerimov
Sustained isometric contractions of skeletal muscles produce intramuscular pressures that lead to blood flow restriction. Thus, we have the paradox of rising O2 demand due to muscle activity and at the same time reduced blood flow. The aim was to assess muscle oxygenation during sustained isometric low (30%), moderate (60%) and submaximal [90% of maximal voluntary contraction (MVC)] contraction of the dorsiflexor muscle. Experiments were conducted on the dominant (right) leg of 8 male students (age 19 ± 2 years, weight 75 ± 6 kg)...
2017: Advances in Experimental Medicine and Biology
https://www.readbyqxmd.com/read/28684191/effects-of-oral-sodium-nitrate-on-forearm-blood-flow-oxygenation-and-exercise-performance-during-acute-exposure-to-hypobaric-hypoxia-4300%C3%A2-m
#18
Heath G Gasier, Anthony R Reinhold, Allison R Loiselle, Shawn E Soutiere, David M Fothergill
A reduction in oxygen transport contributes to impaired exercise capacity at high altitude. Since blood flow is mediated, in part, by nitric oxide (NO), we hypothesized that sodium nitrate provided before forearm grip exercise performed at a simulated altitude of 4300 m (hypobaric hypoxia (HH)) would increase forearm blood flow and oxygenation, and decrease the decrement in grip performance. In a double-blind, randomized crossover study, 10 healthy subjects (9 males and 1 female) performed continuous (CGrip) and repeated rhythmic (RGrip) isometric forearm exercise until task failure in normobaric normoxia (NN), 2...
July 3, 2017: Nitric Oxide: Biology and Chemistry
https://www.readbyqxmd.com/read/28682936/effects-of-wearing-a-compression-garment-during-night-sleep-on-recovery-from-high-intensity-eccentric-concentric-quadriceps-muscle-fatigue
#19
Yohei Shimokochi, Satoshi Kuwano, Taichi Yamaguchi, Hiroyuki Abutani, Norihiro Shima
This study aimed to investigate the effects of wearing a compression garment (CG) during night sleep on muscle fatigue recovery after high-intensity eccentric and concentric knee extensor exercises. Seventeen college male students participated in two experimental sessions under CG and non-CG (NCG) wearing conditions. Before night sleep under CG or NCG wearing conditions, the subjects performed a fatiguing protocol consisting of 10 sets of 10 repetitions of maximal isokinetic eccentric and concentric knee extensor contractions, with 30-second rest intervals between the sets...
July 3, 2017: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/28681366/proposal-for-a-modified-jaw-opening-exercise-for-dysphagia-a-randomized-controlled-trial
#20
Yuji Koyama, Ayaka Sugimoto, Takahide Hamano, Takashi Kasahara, Minoru Toyokura, Yoshihisa Masakado
OBJECTIVE: To verify the feasibility and effectiveness of a newly developed modified jaw opening exercise (MJOE) in post-stroke patients with pharyngeal residue who completed a sixweek exercise regimen. DESIGN: Double-blind, randomized, controlled trial. PARTICIPANTS: 16 patients with stroke-related dysphagia. INTERVENTIONS: Participants were allocated to an intervention group (MJOE: one set of five repetitions at 80% maximum voluntary contraction (MVC) for 6 seconds) or a control group (isometric jaw closing exercise: one set of five repetitions at 20% MVC for 6 seconds)...
July 20, 2017: Tokai Journal of Experimental and Clinical Medicine
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