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https://www.readbyqxmd.com/read/29031138/similarity-of-muscle-synergies-extracted-from-the-lower-limb-including-the-deep-muscles-between-level-and-uphill-treadmill-walking
#1
Akira Saito, Aya Tomita, Ryosuke Ando, Kohei Watanabe, Hiroshi Akima
This study aimed to examine muscle synergies involving the deeper muscles of the lower limb during level and uphill treadmill walking. Seven men and five women walked on a treadmill at three speeds (60, 80, and 100m/min) and two grades (level and 10% grade). Surface electromyographic (EMG) signals were recorded from 10 muscles of the lower limb, including vastus intermedius, adductor magnus, and adductor longus. Muscle synergies were extracted applying non-negative matrix factorization, and the relative co-activation across muscles and the temporal information of synergy recruitment were identified by the muscle synergy vector and synergy activation coefficient, respectively...
October 8, 2017: Gait & Posture
https://www.readbyqxmd.com/read/29031023/whole-body-vibration-combined-with-treadmill-training-improves-walking-performance-in-post-stroke-patients-a-randomized-controlled-trial
#2
Wonjae Choi, Donghun Han, Junesun Kim, Seungwon Lee
BACKGROUND Stroke is characterized by an asymmetrical gait pattern that causes poor stability and reduces overall activity levels. The aim of this study was to investigate the effect of whole-body vibration combined with treadmill training (WBV-TT) on walking performance in patients with chronic stroke. MATERIAL AND METHODS Thirty ambulatory chronic stroke patients were randomly allocated to the WBV-TT group or the treadmill training (TT) group. The participants in the WBV-TT group performed 6 types of exercises on a vibrating platform for 4...
October 14, 2017: Medical Science Monitor: International Medical Journal of Experimental and Clinical Research
https://www.readbyqxmd.com/read/29028920/perceived-fatigability-and-objective-physical-activity-in-mid-to-late-life
#3
Amal A Wanigatunga, Eleanor M Simonsick, Vadim Zipunnikov, Adam P Spira, Stephanie Studenski, Luigi Ferrucci, Jennifer A Schrack
Background: Fatigability, defined as fatigue in relation to a standardized task, predicts functional decline in older adults independent of reported tiredness or energy level. Although the sensation of fatigue, tiredness, and energy level adversely affect physical activity (PA), the association between fatigability and objectively measured PA is unknown. Methods: Participants in the Baltimore Longitudinal Study of Aging (n=557, 50% women, aged 50-97) were instructed to wear an Actiheart accelerometer for 7 consecutive days in the free-living environment...
September 19, 2017: Journals of Gerontology. Series A, Biological Sciences and Medical Sciences
https://www.readbyqxmd.com/read/29028627/local-dynamic-stability-during-treadmill-walking-can-detect-children-with-developmental-coordination-disorder
#4
Merete B Speedtsberg, Sofie B Christensen, Jan Stenum, Thomas Kallemose, Jesper Bencke, Derek J Curtis, Bente R Jensen
OBJECTIVE: Developmental coordination disorder (DCD) is an innate impairment of motor coordination that affects basic locomotion and balance. This study investigated local dynamic stability of trunk accelerations during treadmill walking as an objective evaluation of gait stability and the sensitivity and specificity of this measure to discriminate children with DCD from typically developing children. METHOD: Eight children with DCD and ten age- and gender-matched typically developing children (TD) walked four minutes on a treadmill...
October 5, 2017: Gait & Posture
https://www.readbyqxmd.com/read/29027266/reliable-and-sensitive-physical-testing-of-elite-trapeze-sailors
#5
Jonathan Bay, Jens Bojsen-Møller, Nikolai B Nordsborg
It was investigated, if a newly developed discipline specific test for elite-level trapeze sailors is reli-able and sensitive. Furthermore, the physical demands of trapeze sailing were examined. In part 1, nine national team athletes were accustomed to a simulated sailing test, which subsequently was completed on four occasions to determine test reliability and sensitivity to manipulations in body-weight. Rope-pulling mean power output (MPO), oxygen consumption (VO2 ), heart rate (HR) and blood lactate values were acquired in all trials...
October 13, 2017: Scandinavian Journal of Medicine & Science in Sports
https://www.readbyqxmd.com/read/29027265/shared-and-task-specific-muscle-synergies-of-nordic-walking-and-conventional-walking
#6
Gennaro Boccia, Chiara Zoppirolli, Lorenzo Bortolan, Federico Schena, Barbara Pellegrini
Nordic walking is a form of walking that includes a poling action, and therefore an additional subtask, with respect to conventional walking. The aim of this study was to assess whether Nordic walking required a task-specific muscle coordination with respect to conventional walking. We compared the electromyographic (EMG) activity of 15 upper and lower limb muscles of nine Nordic walking instructors, while executing Nordic walking and conventional walking at 1.3 ms(-1) on a treadmill. Non-negative matrix factorization method was applied to identify muscle synergies, representing the spatial and temporal organization of muscle coordination...
October 13, 2017: Scandinavian Journal of Medicine & Science in Sports
https://www.readbyqxmd.com/read/29025901/effects-of-age-and-exercise-training-on-coronary-microvascular-smooth-muscle-phenotype-and-function
#7
Judy M Muller-Delp, Kazuki Hotta, Bei Chen, Bradley Jon Behnke, Joshua J Maraj, Michael D Delp, Tiffani R Lucero, Jeremy A Bramy, David B Alarcon, Hannah E Morgan, Morgan R Cowan, Anthony D Haynes
Coronary microvascular function and blood flow responses during acute exercise are impaired in the aged heart, but can be restored by exercise training. Coronary microvascular resistance is directly dependent on vascular smooth muscle function in coronary resistance arterioles; therefore, we hypothesized that age impairs contractile function and alters the phenotype of vascular smooth muscle in coronary arterioles. We further hypothesized that exercise training restores contractile function and reverses age-induced phenotypic alterations of arteriolar smooth muscle...
October 12, 2017: Journal of Applied Physiology
https://www.readbyqxmd.com/read/29023846/locomotor-and-skeletal-muscle-abnormalities-in-trembler-j-neuropathic-mice
#8
Darin J Falk, Tori Galatas, Adrian G Todd, Elliott P Soto, Andrew B Harris, Lucia Notterpek
INTRODUCTION: Patients with hereditary peripheral neuropathies exhibit characteristic deformities of the hands and feet and have difficulty ambulating. To examine to what extent neuropathic animals recapitulate these deficits, we studied Trembler J mice, which model early-onset demyelinating neuropathy. METHODS: A cohort of 4-month old female wild type and neuropathic mice were evaluated for locomotor measurements, neuromuscular function and skeletal muscle proteolysis and morphometry...
October 12, 2017: Muscle & Nerve
https://www.readbyqxmd.com/read/29023324/the-physical-response-to-a-simulated-period-of-soccer-specific-fixture-congestion
#9
Richard M Page, Kelly Marrin, Chris M Brogden, Matt Greig
The aim of this study was to assess the physiological, perceptual, and mechanical measures associated with the completion of a simulated period of short-term soccer-specific fixture congestion. Ten male semi-professional soccer players completed three trials of a treadmill-based match simulation, with 48 hours intervening each trial. A repeated measures general linear model identified significantly (P= 0.02) lower knee flexor peak torque (PT) recorded at 300 degs[BULLET OPERATOR]s in the second (141.27 ± 28...
October 10, 2017: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/29023322/effects-of-two-different-training-periodization-models-on-physical-and-physiological-aspects-of-elite-female-team-handball-players
#10
Carmen Manchado, Juan M Cortell-Tormo, Juan Tortosa-Martínez
Manchado, C, Cortell-Tormo, JM, and Tortosa-Martínez, J. Effects of two different training periodization models on physical and physiological aspects of elite female team handball players. J Strength Cond Res XX(X): 000-000, 2017-This study was undertaken to compare training-induced changes in selected physiological and physical team handball performance factors after 2 training periodization models: traditional vs. block periodization (BP). Eleven female team handball players who played over 2 consecutive seasons for a Spanish first league team were assessed twice per season during a training cycle...
October 10, 2017: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/29023280/corrective-exercises-improve-movement-efficiency-and-sensorimotor-function-but-not-fatigue-sensitivity-in-chronic-ankle-instability-patients-a-randomized-controlled-trial
#11
Sajad Bagherian, Nader Rahnama, Erik A Wikstrom
OBJECTIVE: To investigate the effect of corrective exercises on functional movement patterns, sensorimotor function, self-reported function, and fatigue sensitivity in collegiate athletes with chronic ankle instability (CAI). DESIGN: A randomized controlled trial. SETTING: Laboratory of sports sciences. PARTICIPANTS: Forty male volunteers were randomly assigned to the experimental group (age 21.2 ± 1.7 years, height 174...
October 6, 2017: Clinical Journal of Sport Medicine: Official Journal of the Canadian Academy of Sport Medicine
https://www.readbyqxmd.com/read/29022257/acute-and-chronic-exercise-in-animal-models
#12
Vu Thi Thu, Hyoung Kyu Kim, Jin Han
Numerous animal cardiac exercise models using animal subjects have been established to uncover the cardiovascular physiological mechanism of exercise or to determine the effects of exercise on cardiovascular health and disease. In most cases, animal-based cardiovascular exercise modalities include treadmill running, swimming, and voluntary wheel running with a series of intensities, times, and durations. Those used animals include small rodents (e.g., mice and rats) and large animals (e.g., rabbits, dogs, goats, sheep, pigs, and horses)...
2017: Advances in Experimental Medicine and Biology
https://www.readbyqxmd.com/read/29021828/endurance-exercise-training-decreased-serum-levels-of-surfactant-protein-d-and-improved-aerobic-fitness-of-obese-women-with-type-2-diabetes
#13
Sajjad Rezaei, Mahdieh Molanouri Shamsi, Mehdi Mahdavi, Azadeh Jamali, Jonato Prestes, Ramires Alsamir Tibana, James Wilfred Navalta, Fabrício Azevedo Voltarelli
BACKGROUND: Surfactant protein D (SP-D) is a member of the collectin family and is an important component of the pulmonary innate host defense. To find the relationship between exercise training and SP-D in diabetes, we examined the possible effects of a 10-week endurance exercise-training program on serum levels of SP-D, leptin, lipid profile and insulin resistance in obese women with type-2 diabetes mellitus (T2DM). METHODS: Twenty-two obese women with T2DM were randomly assigned to either exercise training (ET) or control (C) group...
2017: Diabetology & Metabolic Syndrome
https://www.readbyqxmd.com/read/29021827/coordination-among-the-rearfoot-midfoot-and-forefoot-during-walking
#14
Tomoya Takabayashi, Mutsuaki Edama, Emi Nakamura, Erika Yokoyama, Chiaki Kanaya, Masayoshi Kubo
BACKGROUND: Examining coordination between segments is essential for prevention and treatment of injuries. However, traditional methods such as ratio, cross-correlation technique, and angle-time plot may not provide a complete understanding of intersegmental coordination. The present study aimed to quantify the coordination among the rearfoot, midfoot, and forefoot segments during walking. METHODS: Twenty healthy young men walked barefoot on a treadmill. Reflective markers were fixed to their right shank and foot based on the Leardini foot model...
2017: Journal of Foot and Ankle Research
https://www.readbyqxmd.com/read/29021758/acute-neuromuscular-adaptations-in-the-postural-control-of-patients-with-parkinson-s-disease-after-perturbed-walking
#15
Cristian F Pasluosta, Simon Steib, Sarah Klamroth, Heiko Gaßner, Julia Goßler, Julius Hannink, Vinzenz von Tscharner, Klaus Pfeifer, Juergen Winkler, Jochen Klucken, Bjoern M Eskofier
Patients suffering from Parkinson's disease (PD) present motor impairments reflected in the dynamics of the center of pressure (CoP) adjustments during quiet standing. One method to study the dynamics of CoP adjustments is the entropic half-life (EnHL), which measures the short-term correlations of a time series at different time scales. Changes in the EnHL of CoP time series suggest neuromuscular adaptations in the control of posture. In this study, we sought to investigate the immediate changes in the EnHL of CoP adjustments of patients with PD during one session of perturbed (experimental group) and unperturbed treadmill walking (control group)...
2017: Frontiers in Aging Neuroscience
https://www.readbyqxmd.com/read/29020403/cardiac-and-systemic-rejuvenation-after-cardiosphere-derived-cell-therapy-in-senescent-rats
#16
Lilian Grigorian-Shamagian, Weixin Liu, Soraya Fereydooni, Ryan C Middleton, Jackelyn Valle, Jae Hyung Cho, Eduardo Marbán
Aim: The aim is to assess the effects of CDCs on heart structure, function, gene expression, and systemic parameters in aged rats. Diastolic dysfunction is characteristic of aged hearts. Cardiosphere-derived cell (CDC) therapy has exhibited several favourable effects on heart structure and function in humans and in preclinical models; however, the effects of CDCs on aging have not been evaluated. Methods and Results: We compared intra-cardiac injections of neonatal rat CDCs to vehicle (phosphate-buffered saline, PBS) in 21...
August 14, 2017: European Heart Journal
https://www.readbyqxmd.com/read/29019708/effects-of-long-term-exercise-and-low-level-inhibition-of-gabaergic-synapses-on-motor-control-and-the-expression-of-bdnf-in-the-motor-related-cortex
#17
Takahiro Inoue, Shuta Ninuma, Masataka Hayashi, Akane Okuda, Tadayoshi Asaka, Hiroshi Maejima
Objectives Brain-derived neurotrophic factor (BDNF) plays important roles in neuroplasticity in the brain. The objective of this study was to examine the effects of long-term exercise combined with low-level inhibition of GABAergic synapses on motor control and the expression of BDNF in the motor-related cortex. Methods ICR mice were divided into four groups based on the factors exercise and GABAA receptor inhibition. We administered the GABAA receptor antagonist bicuculline intraperitoneally (0.25 mg/kg)...
October 11, 2017: Neurological Research
https://www.readbyqxmd.com/read/29018989/effects-of-prior-aerobic-exercise-on-sitting-induced-vascular-dysfunction-in-healthy-men
#18
Kevin D Ballard, Robert M Duguid, Craig W Berry, Priyankar Dey, Richard S Bruno, Rose Marie Ward, Kyle L Timmerman
INTRODUCTION: Acute aerobic exercise prevents sitting-induced impairment of flow-mediated dilation (FMD). Further, evidence suggests that sitting-induced impairment of FMD occurs via an oxidative stress-dependent mechanism that disrupts endothelial function. PURPOSE: We hypothesized that acute aerobic exercise would prevent impairment of femoral artery FMD by limiting oxidative stress responses that increase endothelin-1 (ET-1) levels and disrupt nitric oxide (NO) status...
October 10, 2017: European Journal of Applied Physiology
https://www.readbyqxmd.com/read/29018822/expression-of-neurotrophin-3-and-trkc-following-focal-cerebral-ischemia-in-adult-rat-brain-with-treadmill-exercise
#19
Jin-Young Chung, Min-Wook Kim, Wooseok Im, In Koo Hwang, Moon-Suk Bang, Manho Kim
Neurotrophin-3 (NT-3) is a neurotrophic factor that mainly binds to the tyrosine kinase C (trkC) receptor. NT-3 has been shown to have neuroprotective effects in focal cerebral ischemia. Exercise also has ability to induce functional recovery in focal cerebral ischemia. However, the relationship between NT-3, its receptor trkC, and exercise has not been revealed. In this study, we assessed the expressions of NT-3 and trkC in focal cerebral ischemia. We also assessed the expression of NT-3 and trkC with treadmill exercise in focal cerebral ischemia...
2017: BioMed Research International
https://www.readbyqxmd.com/read/29018355/criterion-validity-of-commercially-available-physical-activity-tracker-to-estimate-step-count-covered-distance-and-energy-expenditure-during-sports-conditions
#20
Yvonne Wahl, Peter Düking, Anna Droszez, Patrick Wahl, Joachim Mester
Background: In the past years, there was an increasing development of physical activity tracker (Wearables). For recreational people, testing of these devices under walking or light jogging conditions might be sufficient. For (elite) athletes, however, scientific trustworthiness needs to be given for a broad spectrum of velocities or even fast changes in velocities reflecting the demands of the sport. Therefore, the aim was to evaluate the validity of eleven Wearables for monitoring step count, covered distance and energy expenditure (EE) under laboratory conditions with different constant and varying velocities...
2017: Frontiers in Physiology
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