keyword
MENU ▼
Read by QxMD icon Read
search

Movement variability

keyword
https://www.readbyqxmd.com/read/28215005/effect-of-bite-openings-and-mandibular-protrusion-on-genioglossus-muscle-activity-in-healthy-adults-with-oral-appliance
#1
Jianlan Long, Toru Ogawa, Toshimi Ito, Michikazu Matsuda, Wei Li, Haiyang Yu, Keiichi Sasaki
Oral appliance (OA) can effectively treat obstructive sleep apnea; however, numerous types of oral appliances and designs are variable and the precise mechanisms behind differences in treatment outcomes are uncertain. The objective of this study was to evaluate the effects of different degrees of mandibular position [4° of bite openings (BO): 2, 4, 8 and 12 mm; and protrusion (P): 0, 50%, MAX], for both the upright and supine positions: BO2 mm_P0%, BO4 mm_P0%, BO4 mm_P50%, BO4 mm_PMAX, BO8 mm_P0%, BO12 mm_P0%; with an OA on the: (1) activity of the genioglossus (GG) muscle by electromyogram, (2) inspiration by airflow sensor, and (3) recording mandibular movements (incisor and mandibular condyle point) in each position...
February 18, 2017: Odontology
https://www.readbyqxmd.com/read/28214862/differential-clonal-expansion-in-an-invading-cell-population-clonal-advantage-or-dumb-luck
#2
Donald F Newgreen, Dongcheng Zhang, Bevan L Cheeseman, Benjamin J Binder, Kerry A Landman
In neoplastic cell growth, clones and subclones are variable both in size and mutational spectrum. The largest of these clones are believed to represent those cells with mutations that make them the most "fit," in a Darwinian sense, for expansion in their microenvironment. Thus, the degree of quantitative clonal expansion is regarded as being determined by innate qualitative differences between the cells that originate each clone. Here, using a combination of mathematical modelling and clonal labelling experiments applied to the developmental model system of the forming enteric nervous system, we describe how cells which are qualitatively identical may consistently produce clones of dramatically different sizes: most clones are very small while a few clones we term "superstars" contribute most of the cells to the final population...
2017: Cells, Tissues, Organs
https://www.readbyqxmd.com/read/28214432/degree-of-target-utilization-influences-the-location-of-movement-endpoint-distributions
#3
Andrew B Slifkin, Jeffrey R Eder
According to dominant theories of motor control, speed and accuracy are optimized when, on the average, movement endpoints are located at the target center and when the variability of the movement endpoint distributions is matched to the width of the target (viz., Meyer, Abrams, Kornblum, Wright & Smith, 1988). The current study tested those predictions. According to the speed-accuracy trade-off, expanding the range of variability to the amount permitted by the limits of the target boundaries allows for maximization of movement speed while centering the distribution on the target center prevents movement errors that would have occurred had the distribution been off center...
February 15, 2017: Acta Psychologica
https://www.readbyqxmd.com/read/28212832/motor-dysfunction-and-alterations-in-glutathione-concentration-cholinesterase-activity-and-bdnf-expression-in-substantia-nigra-pars-compacta-in-rats-with-pedunculopontine-lesion
#4
Lisette Blanco-Lezcano, Javier Jimenez-Martin, Mei-Li Díaz-Hung, Esteban Alberti-Amador, Maylin Wong-Guerra, Ma Elena González-Fraguela, Bárbara Estupiñán-Díaz, Teresa Serrano-Sánchez, Liliana Francis-Turner, Susana Delgado-Ocaña, Yanier Núñez-Figueredo, Yamilé Vega-Hurtado, Isabel Fernández-Jiménez
Pedunculopontine nucleus (PPN) has been considered a critically important region in the regulation of some of the physiological functions that fail during the progression of Parkinson's disease (PD). In this paper, the effects of unilateral neurotoxic lesion of the PPN [through the injection of N-methyl-D-aspartate (NMDA) solution (concentration: 0.1 M; volume: 0.5 µL)] in motor execution and gait disorders and the changes in cellular and molecular indicators in rat nigral tissue were evaluated. The motor execution was assessed using the beam test (BT) and the gait disorders by footprint test...
February 14, 2017: Neuroscience
https://www.readbyqxmd.com/read/28211138/nocturnal-autonomic-nervous-system-activity-and-morning-proinflammatory-cytokines-in-young-adult-african-americans
#5
Kimberly A Bell, Ihori Kobayashi, Yuanxiu Chen, Thomas A Mellman
Compromised sleep and increased sympathetic nervous system (SNS) activity are implicated in the pathogenesis of, and disparities in, cardiovascular disease. Parasympathetic dominance during sleep may be important for cardiovascular health. Sleep and autonomic balance influence immune activity, which impacts atherogenesis. We evaluated relationships between autonomic balance during sleep and morning levels of the immune activating cytokines, C-reactive protein (CRP) and interleukin (IL)-6. Ninety-four (59 female) young adult African Americans without medical conditions and substance use disorders spent 2 consecutive nights in a clinical research unit for sleep recordings and blood drawing on awakening...
February 17, 2017: Journal of Sleep Research
https://www.readbyqxmd.com/read/28210404/infraorbital-nerve-decompression-for-infraorbital-neuralgia-causalgia-following-blowout-orbital-fractures-a-case-series
#6
Bijan Beigi, Mazda Beigi, Nuwan Niyadurupola, Manuel Saldana, Nabil El-Hindy, Deepak Gupta
The purpose of this study was to present the management of a series of patients referred with infraorbital nerve paraesthesia that developed after insignificant orbital floor fracture without diplopia or exophthalmos, and that did not require initial surgical repair. This is a retrospective interventional case series. The main outcome and measures were assessment of preoperative symptoms including neuralgia and sensory symptoms; review of periorbital computed tomography (CT) scans; and assessment of postoperative effects of surgery for infraorbital nerve decompression...
March 2017: Craniomaxillofacial Trauma & Reconstruction
https://www.readbyqxmd.com/read/28210344/differences-in-movement-speed-before-and-after-a-split-step-between-professional-and-junior-tennis-players
#7
Aleš Filipčič, Bojan Leskošek, Goran Munivrana, Gabriela Ochiana, Tjaša Filipčič
This study investigated tennis players' speed before, during and after the split-step, deceleration before and acceleration after the split-step in four different stroke groups in three age categories. Seven male professional, eleven male and ten female junior tennis players were recorded with video cameras at official tournaments. Using the SAGIT system, we gathered data on 8,545 split-steps. Tennis players performed a split-step in 82.9% of cases. A tennis player's speed, deceleration and acceleration were measured 0...
January 1, 2017: Journal of Human Kinetics
https://www.readbyqxmd.com/read/28210343/reliability-and-factorial-validity-of-non-specific-and-tennis-specific-pre-planned-agility-tests-preliminary-analysis
#8
Damir Sekulic, Ognjen Uljevic, Mia Peric, Miodrag Spasic, Miran Kondric
Agility is an important quality in tennis, yet there is an evident lack of studies focussing on the applicability of tennis-specific agility performances and comparing them to equivalent non-specific agility performances. The aim of this study was to evaluate the reliability and factorial validity of three tests of pre-planned agility, performed in specific (with a tennis racquet) and non-specific (without a tennis racquet) conditions. The sample consisted of 33 tennis players (13 males and 20 females; age: 18...
January 1, 2017: Journal of Human Kinetics
https://www.readbyqxmd.com/read/28210341/a-multidisciplinary-investigation-of-the-effects-of-competitive-state-anxiety-on-serve-kinematics-in-table-tennis
#9
Vuong Ngo, Hugh Richards, Miran Kondric
Displays of anxiety in table tennis were assessed through subjective (a self-report questionnaire), physiological (heart-rate variability) and kinematic variables. Using a within-group crossover design, 9 university-level table tennis players completed a series of serves under low- and high-anxiety conditions. Anxiety manipulation was achieved through the introduction of a national standard table tennis player, known to the participants, to receive serves in the high-anxiety condition, whilst serves were received by no opponent in the low-anxiety condition...
January 1, 2017: Journal of Human Kinetics
https://www.readbyqxmd.com/read/28208707/gaitkeeper-a-system-for-measuring-canine-gait
#10
Cassim Ladha, Jack O'Sullivan, Zoe Belshaw, Lucy Asher
It is understood gait has the potential to be used as a window into neurodegenerative disorders, identify markers of subclinical pathology, inform diagnostic algorithms of disease progression and measure the efficacy of interventions. Dogs' gaits are frequently assessed in a veterinary setting to detect signs of lameness. Despite this, a reliable, affordable and objective method to assess lameness in dogs is lacking. Most described canine lameness assessments are subjective, unvalidated and at high risk of bias...
February 8, 2017: Sensors
https://www.readbyqxmd.com/read/28207462/what-are-the-contributing-factors-for-postsurgical-relapse-after-two-jaw-surgery-in-patients-with-cleft-lip-and-palate
#11
Yoon-Hee Park, Ji-Hee Seo, Il-Hyung Yang, Jin-Young Choi, Jong-Ho Lee, Myung-Jin Kim, Seung-Hak Baek
The purpose of this study was to investigate the amount and pattern of postsurgical relapse after 2-jaw surgery in cleft lip and palate patients in terms of the sagittal and vertical aspects. The samples consisted of 21 adult patients who had the similar initial skeletodental pattern before surgery and underwent 2-jaw surgery. They were divided into high relapse (n = 11) and low relapse groups (n = 10) (criteria, 30% forward relapse of the B point). After the cephalometric variables of cephalograms taken at 1 month before surgery (T0), immediately after surgery (T1), and at least 1 year after surgery (T2) were measured, the Wilcoxon test, Mann-Whitney U test, and Pearson correlation test were performed for statistical analysis...
February 15, 2017: Journal of Craniofacial Surgery
https://www.readbyqxmd.com/read/28207174/species-distribution-models-may-misdirect-assisted-migration-insights-from-the-introduction-of-douglas-fir-to-europe
#12
Juliette Boiffin, Vincent Badeau, Nathalie Bréda
Species distribution models (SDMs), which statistically relate species occurrence to climatic variables, are widely used to identify areas suitable for species growth under future climates and to plan for assisted migration. When SDMs are projected across times or spaces, it is assumed that species climatic requirements remain constant. However, empirical evidence supporting this assumption is rare, and SDM predictions could be biased. Historical human-aided movements of tree species can shed light on the reliability of SDM predictions in planning for assisted migration...
October 4, 2016: Ecological Applications: a Publication of the Ecological Society of America
https://www.readbyqxmd.com/read/28205498/cognitive-control-learning-and-clinical-motor-ratings-are-most-highly-associated-with-basal-ganglia-brain-volumes-in-the-premanifest-huntington-s-disease-phenotype
#13
Maria B Misiura, Spencer Lourens, Vince D Calhoun, Jeffrey Long, Jeremy Bockholt, Hans Johnson, Ying Zhang, Jane S Paulsen, Jessica A Turner, Jingyu Liu, Betul Kara, Elizabeth Fall
OBJECTIVES: Huntington's disease (HD) is a debilitating genetic disorder characterized by motor, cognitive and psychiatric abnormalities associated with neuropathological decline. HD pathology is the result of an extended chain of CAG (cytosine, adenine, guanine) trinucleotide repetitions in the HTT gene. Clinical diagnosis of HD requires the presence of an otherwise unexplained extrapyramidal movement disorder in a participant at risk for HD. Over the past 15 years, evidence has shown that cognitive, psychiatric, and subtle motor dysfunction is evident decades before traditional motor diagnosis...
February 2017: Journal of the International Neuropsychological Society: JINS
https://www.readbyqxmd.com/read/28203593/effects-of-sex-and-fatigue-on-biomechanical-measures-during-the-drop-jump-task-in-children
#14
Kristín Briem, Kolbrún Vala Jónsdóttir, Árni Árnason, Þórarinn Sveinsson
BACKGROUND: Female athletes have a higher rate of anterior cruciate ligament (ACL) injury than males from adolescence and into maturity, which is suggested to result from sex-specific changes in dynamic movement patterns with maturation. Few studies have studied movement strategies and response to fatigue in children. PURPOSE: To evaluate the effect of fatigue on biomechanical variables associated with increased risk for ACL injury during a drop-jump (DJ) performance in children...
January 2017: Orthopaedic Journal of Sports Medicine
https://www.readbyqxmd.com/read/28199903/the-effect-of-variable-rest-intervals-and-chronic-ankle-instability-on-triplanar-ankle-motion-during-performance-of-the-star-excursion-balance-test
#15
Yong Ung Kwon, D S Blaise Williams
Inadequate rest intervals may contribute to impaired performance during functional tests. However, the effect of different rest intervals on performance of the SEBT in individuals with and without CAI is not known. Our purposes were to determine whether different rest intervals impact ankle kinematics during the SEBT and whether there differences between those two populations. 24 controls and 24 CAI completed 3 trials in 3 reach directions (anteromedial; AM, medial; M, posteromedial; PM). The order of rest intervals and reach distance were randomized and counterbalanced...
February 12, 2017: Human Movement Science
https://www.readbyqxmd.com/read/28198601/the-effect-of-high-speed-strength-training-with-heavy-and-low-workloads-on-neuromuscular-function-and-maximal-concentric-quadriceps-strength
#16
Ali A Mazani, Mohamed R Hamdinia, Amir H Haghigi, Nosratollah Hedayatpour
BACKGROUND: Dynamic strength training has been widely used to increase the ability of skeletal muscle to produce muscle force. Manipulating resistance training program variables has been commonly used as a tool to optimize maximum strength. This study examined the effects of 12 weeks of high-speed strength training with low and heavy workloads on muscle strength and neuromuscular function of quadriceps muscle. METHODS: Thirty male subjects (age, mean ± SD, 20.6 ± 2...
February 14, 2017: Journal of Sports Medicine and Physical Fitness
https://www.readbyqxmd.com/read/28195980/importance-reliability-and-usefulness-of-acceleration-measures-in-team-sports
#17
Jace A Delaney, Cloe J Cummins, Heidi R Thornton, Grant M Duthie
The ability to accelerate, decelerate and change direction efficiently is imperative to successful team-sports performance. Traditional intensity-based thresholds for acceleration and deceleration may be inappropriate for time-series data, and have been shown to exhibit poor reliability, suggesting other techniques may be preferable. This study assessed movement data from one professional rugby league team throughout two full seasons and one pre-season period. Using both 5 Hz and 10 Hz global positioning systems (GPS) units, a range of acceleration-based variables were evaluated for their inter-unit reliability, ability to discriminate between positions, and associations with perceived muscle soreness...
February 8, 2017: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/28195350/overcoming-the-divide-between-ataxias-and-spastic-paraplegias-shared-phenotypes-genes-and-pathways
#18
REVIEW
Matthis Synofzik, Rebecca Schüle
Autosomal-dominant spinocerebellar ataxias, autosomal-recessive spinocerebellar ataxias, and hereditary spastic paraplegias have traditionally been designated in separate clinicogenetic disease classifications. This classification system still largely frames clinical thinking and genetic workup in clinical practice. Yet, with the advent of next-generation sequencing, phenotypically unbiased studies have revealed the limitations of this classification system. Various genes (eg, SPG7, SYNE1, PNPLA6) traditionally rooted in either the ataxia or hereditary spastic paraplegia classification system have now been shown to cause ataxia on the one end of the disease continuum and hereditary spastic paraplegia on the other...
February 14, 2017: Movement Disorders: Official Journal of the Movement Disorder Society
https://www.readbyqxmd.com/read/28192512/explosive-strength-and-endurance-adaptations-in-young-elite-soccer-players-during-two-soccer-seasons
#19
Riccardo Di Giminiani, Christiano Visca
The purpose of the present study was to investigate the explosive strength and endurance adaptations in young elite soccer players who underwent a supervised training program for a period of two years. Nineteen players, with seven years of training experience (age: 13.3 ± 0.1 years; body weight: 57.9 ± 4.9 kg; height: 168.9 ± 4.7 cm; BMI: 20.1 ± 1.1 kg/m2), voluntarily participated in the present study. The testing sessions were performed at the beginning of the preparation period in the first (T1), second (T2), and third year (T3)...
2017: PloS One
https://www.readbyqxmd.com/read/28190641/emergence-of-coordinated-neural-dynamics-underlies-neuroprosthetic-learning-and-skillful-control
#20
Vivek R Athalye, Karunesh Ganguly, Rui M Costa, Jose M Carmena
During motor learning, movements and underlying neural activity initially exhibit large trial-to-trial variability that decreases over learning. However, it is unclear how task-relevant neural populations coordinate to explore and consolidate activity patterns. Exploration and consolidation could happen for each neuron independently, across the population jointly, or both. We disambiguated among these possibilities by investigating how subjects learned de novo to control a brain-machine interface using neurons from motor cortex...
February 6, 2017: Neuron
keyword
keyword
43320
1
2
Fetch more papers »
Fetching more papers... Fetching...
Read by QxMD. Sign in or create an account to discover new knowledge that matter to you.
Remove bar
Read by QxMD icon Read
×

Search Tips

Use Boolean operators: AND/OR

diabetic AND foot
diabetes OR diabetic

Exclude a word using the 'minus' sign

Virchow -triad

Use Parentheses

water AND (cup OR glass)

Add an asterisk (*) at end of a word to include word stems

Neuro* will search for Neurology, Neuroscientist, Neurological, and so on

Use quotes to search for an exact phrase

"primary prevention of cancer"
(heart or cardiac or cardio*) AND arrest -"American Heart Association"