journal
MENU ▼
Read by QxMD icon Read
search

Motor Control

journal
https://www.readbyqxmd.com/read/30352527/effects-of-reduced-effort-on-mechanical-output-obtained-from-maximum-vertical-jumps
#1
Kajetan J Słomka, Slobodan Jaric, Grzegorz Sobota, Ryszard Litkowycz, Tomasz Skowronek, Marian Rzepko, Grzegorz Juras
The aim of this study was to evaluate the effect of reduced effort on maximum countermovement jumps. Groups of unskilled and skilled jumpers performed countermovement jumps without an arm swing at 100% and 50% effort. The results revealed markedly reduced jump height and work performed at 50% effort, although the maximum force and power output remained virtually unchanged. The observed differences were consistent across individuals with different jumping skills. A possible cause of differences in changes across the tested variables was a reduced countermovement depth associated with the 50% effort jumps...
October 24, 2018: Motor Control
https://www.readbyqxmd.com/read/30319011/interrelationships-among-motor-coordination-body-fat-and-physical-activity-in-adolescent-boys
#2
Daniel das Virgens Chagas, Luiz Alberto Batista
PURPOSE: To analyze the interrelationships among motor coordination, body fat, and physical activity in adolescent boys. METHODS: A total of 69 boys aged 12-14 years were recruited. Motor coordination was assessed using the Körperkoordinationstest für Kinder. Correlations (bivariate and partial) and mediation analysis were used to examine the interrelationships among the selected variables. RESULTS: Body fat was significantly correlated with global motor coordination, walking backward (Motor Quotient 1), and one-legged hopping (Motor Quotient 2) scores with and without controlling for physical activity level...
October 13, 2018: Motor Control
https://www.readbyqxmd.com/read/30318988/nonlinear-dynamic-measures-for-evaluating-postural-control-in-individuals-with-and-without-chronic-ankle-instability
#3
Masafumi Terada, Megan Beard, Sara Carey, Kate Pfile, Brian Pietrosimone, Elizabeth Rullestad, Heather Whitaker, Phillip Gribble
This study aimed to compare time-to-boundary and sample entropy during a single-leg balance task between individuals with chronic ankle instability (CAI), lateral ankle sprain copers, and healthy controls. Twenty-two participants with CAI, 20 lateral ankle sprain copers, and 24 healthy controls performed a single-leg balance task during an eyes-closed condition. Participants with CAI exhibited lower time-to-boundary values compared with lateral ankle sprain copers and healthy controls. However, we did not find differences in sample entropy variables between cohorts...
October 13, 2018: Motor Control
https://www.readbyqxmd.com/read/30208802/comparing-different-methods-to-create-a-linear-model-for-uncontrolled-manifold-analysis
#4
Inge Tuitert, Tim A Valk, Egbert Otten, Laura Golenia, Raoul M Bongers
An essential step in uncontrolled manifold analysis is creating a linear model that relates changes in elemental variables to changes in performance variables. Such linear models are usually created by means of an analytical method. However, a multiple regression analysis is also suggested. Whereas the analytical method includes only averages of joint angles, the regression method uses the distribution of all joint angles. We examined whether the latter model is more suitable to describe manual reaching movements...
September 12, 2018: Motor Control
https://www.readbyqxmd.com/read/30208756/no-vertical-visual-field-asymmetry-in-online-control-evidence-from-reaching-in-depth
#5
Jennifer Campbell, Stephanie Rossit, Matthew Heath
We sought to determine whether a putative lower-visual field (loVF) advantage for projections to the visuomotor networks of the dorsal visual pathway influences online reaching control. Participants reached to 3-dimensional depth targets presented in the loVF and upper-visual field (upVF) in binocular and monocular visual conditions, and when online vision was available (i.e., closed-loop) or unavailable (i.e., open-loop). To examine the degree to which responses were controlled online we computed the proportion of variance (R2 ) explained by the spatial position of the limb at distinct stages in the reaching trajectory relative to a response's ultimate movement endpoint...
September 12, 2018: Motor Control
https://www.readbyqxmd.com/read/29651890/can-postural-control-asymmetry-predict-falls-in-people-with-parkinson-s-disease
#6
Victor Spiandor Beretta, Fabio Augusto Barbieri, Diego Orcioli-Silva, Paulo Cezar Rocha Dos Santos, Lucas Simieli, Rodrigo Vitório, Lilian Teresa Bucken Gobbi
This study aimed to determine the relationship between postural asymmetry and falls in Parkinson's disease (PD). In total, 28 patients with PD were included. Postural control was analyzed in bipedal, tandem, and unipedal standing. Center of pressure (CoP) parameters were calculated for both limbs, and asymmetry was assessed using the asymmetry index. Logistic regression was used to predict/classify fallers through postural asymmetry. The Spearman correlation was performed to relate asymmetry and falls number...
October 1, 2018: Motor Control
https://www.readbyqxmd.com/read/29523056/an-investigation-into-force-sense-at-the-shoulder
#7
Katya Trousset, David Phillips, Andrew Karduna
Proprioception is assessed more often through joint position sense and kinesthesia than force sense. The purpose of this study is to investigate force sense at the shoulder. A total of 12 subjects were recruited. An ipsilateral force reproduction protocol at the shoulder at 50°, 70°, and 90° and 120%, 140%, and 160% baseline torque. Dependent variables were constant error (CE) and root mean square error. An effect was found for load on absolute (p = .001) and normalized CE (p < .001). CE decreased with increased load...
October 1, 2018: Motor Control
https://www.readbyqxmd.com/read/29523052/influence-of-music-style-and-rate-on-repetitive-finger-tapping
#8
Elizabeth L Stegemöller, Joshua R Tatz, Alison Warnecke, Paul Hibbing, Brandon Bates, Andrew Zaman
Auditory cues, including music, are commonly used in the treatment of persons with Parkinson's disease. Yet, how music style and movement rate modulate movement performance in persons with Parkinson's disease have been neglected and remain limited in healthy young populations. The purpose of this study was to determine how music style and movement rate influence movement performance in healthy young adults. Healthy participants were asked to perform repetitive finger movements at two pacing rates (70 and 140 beats per minute) for the following conditions: (a) a tone only, (b) activating music, and (c) relaxing music...
October 1, 2018: Motor Control
https://www.readbyqxmd.com/read/29488828/effect-of-different-shooting-techniques-in-floorball-on-accuracy-and-velocity-in-experienced-male-floorball-players
#9
Roland van den Tillaar
The aims of this study were to investigate the effect of four different shooting techniques (slap, sweeper, drag, and wrist shots) in floorball on velocity and accuracy in experienced floorball players, and to investigate whether target height has an influence on these shooting performances. Ten experienced male floorball players (age, 21 ± 4 years; body mass, 81.5 ± 10 kg; body height, 1.85 ± 0.07 m; and years of experience, 6.9 ± 3.1 years) shot as hard as possible and tried to hit the upper and lower targets with four different shooting techniques from a 4-m distance...
October 1, 2018: Motor Control
https://www.readbyqxmd.com/read/29488824/reading-and-writing-skills-in-children-with-specific-learning-disabilities-with-and-without-developmental-coordination-disorder
#10
Carlo Di Brina, Roberto Averna, Paola Rampoldi, Serena Rossetti, Roberta Penge
This pilot study is to investigate the influence of a developmental coordination disorder (DCD) comorbidity in a group of children with learning disability (LD). Reading and writing were assessed to investigate if the coexistence of a motor impairment can worsen writing quality, speed, and reading accuracy. A sample of 33 LD children (aged 7-11 years) was divided in two subgroups, on the base of their scores on the Movement Assessment Battery for Children: LD-only (n = 14) and LD with a comorbidity for DCD (LD-DCD, n = 19)...
October 1, 2018: Motor Control
https://www.readbyqxmd.com/read/29486653/brain-activity-on-observation-of-another-person-s-action-a-magnetoencephalographic-study
#11
Jumpei Mizuno, Masashi Kawamura, Minoru Hoshiyama
Brain activity was recorded using a whole-head magnetoencephalography system followed by coherence analysis to assess neural connectivity in 10 healthy right-handed adults to clarify differences in neural connectivity in brain regions during action observation from several perspectives. The subjects were instructed to observe and memorize or imitate the hand action from a first-person or second-person visual perspective. The brain activity in coherence was modified among frontal and central, sensorimotor, and mirror neuron system-related regions based on the visual perspectives of finger movements...
October 1, 2018: Motor Control
https://www.readbyqxmd.com/read/29486627/working-memory-task-influence-in-postural-stability-and-cognitive-function-in-adolescents
#12
Isaac Estevan, Sergio Gandia, Israel Villarrasa-Sapiña, José Luis Bermejo, Xavier García-Massó
This paper describes a study on postural stability and cognitive function according to the difficulty increment of a working memory task (WMT) and age group in adolescents. One hundred and twenty-three participants (13-16 years) performed single and dual tasks in a bipedal standing position while barefoot. Four trials were conducted, consisting of single and dual tasks in three progressively difficult WMT conditions (i.e., 3-, 5-, and 7-digit sequences). Friedman's analysis of variance and Kruskal-Wallis tests were conducted to test the effect of the WMT and age group, respectively...
October 1, 2018: Motor Control
https://www.readbyqxmd.com/read/29486620/kinetic-analysis-of-fingers-during-aimed-throwing
#13
Shohei Shibata, Yuki Inaba, Shinsuke Yoshioka, Senshi Fukashiro
This study had two objectives: (a) revealing the difference in finger segments between the conventional and finger models during aimed throwing and (b) examining the central nervous system's timing control between the wrist torque and finger torque. Participants were seven baseball players. Finger kinetics was calculated by an inverse dynamics method. In the conventional model, wrist flexion torque was smaller than that in the finger model because of the error in ball position approximation. The maximal correlation coefficient between the wrist torque and finger torque was high (r = ...
October 1, 2018: Motor Control
https://www.readbyqxmd.com/read/30012052/brain-activation-during-passive-and-volitional-pedaling-after-stroke
#14
Brice T Cleland, Sheila Schindler-Ivens
BACKGROUND: Prior work indicates that pedaling-related brain activation is lower in people with stroke than in controls. We asked whether this observation could be explained by between-group differences in volitional motor commands and pedaling performance. METHODS: Individuals with and without stroke performed passive and volitional pedaling while brain activation was recorded with functional magnetic resonance imaging. The passive condition eliminated motor commands to pedal and minimized between-group differences in pedaling performance...
July 17, 2018: Motor Control
https://www.readbyqxmd.com/read/30012053/the-roles-of-declarative-knowledge-and-working-memory-in-explicit-motor-learning-and-practice-among-children-with-low-motor-abilities
#15
Femke van Abswoude, John van der Kamp, Bert Steenbergen
Effective learning methods are essential for motor skill development and participation in children with low motor abilities. Current learning methods predominantly aim to increase declarative knowledge through explicit instructions that necessitate sufficient working memory capacity. This study investigated the roles of declarative knowledge and working memory capacity in explicit motor learning of children with low motor abilities. We studied both acquisition performance (i.e., performance during practice) and learning (i...
July 16, 2018: Motor Control
https://www.readbyqxmd.com/read/30012041/age-related-differences-in-postural-and-goal-directed-movements-during-medial-lateral-rhythmic-stepping
#16
Timothy A Hanke, Bruce Kay, Michael Turvey, David Tiberio
Lateral stability and weight transfer are important for successful stepping and are associated with falls in older adults (OAs). This study assessed the influence of step pacing frequency during medial-lateral stepping in place on body center of mass and lower limb movement in young adults, middle-aged adults, and OAs. Medial-lateral center of mass and stepping limb motion and lower limb loading data were collected. Center of mass motion decreased with increasing pacing frequency and increased to a lesser extent with decreasing pacing frequency...
July 16, 2018: Motor Control
https://www.readbyqxmd.com/read/30008242/effects-of-tai-chi-chuan-and-brisk-walking-exercise-on-balance-ability-in-elderly-women-a-randomized-controlled-trial
#17
Wei Sun, Xiujie Ma, Lin Wang, Cui Zhang, Qipeng Song, Houxin Gu, Dewei Mao
This study aims to investigate the effects of Tai Chi Chuan (TCC) and brisk walking (BW) on balance and training duration for the two exercises to significantly improve balance. A total of 48 elderly women were randomly divided into three groups. The TCC and BW groups completed a 60-min intervention training program with five sessions weekly for 16 weeks. Single-leg standing balance was tested every 4 weeks. Results showed that all the variables with eyes open improved on the eighth week (p < .05) in the TCC group and on the 12th week (p < ...
July 15, 2018: Motor Control
https://www.readbyqxmd.com/read/30008245/visual-vestibular-interaction-for-postural-control-during-sit-to-stand-effects-of-aging
#18
Kai Yan Lui, Patricia Hewston, Nandini Deshpande
During sit-to-stand (STS), the vestibular system is highly stimulated in response to linear acceleration of the head and may play an important role, in addition to vision, for postural control. We examined the effects of aging on visual-vestibular interaction for postural control during STS in 15 young (22.5 ± 1.1 years) and 15 older (73.9 ± 5.3 years) participants. Vestibular information was manipulated using galvanic vestibular stimulation. Vision conditions involved normal (eyes open), suboptimal (blurring goggles), and no (eyes closed) vision...
July 14, 2018: Motor Control
https://www.readbyqxmd.com/read/29523053/the-evaluation-of-changes-of-angles-in-selected-joints-during-topspin-forehand-in-table-tennis
#19
Ziemowit Bańkosz, Sławomir Winiarski
The aims of this study were to evaluate movement patterns of topspin forehand, to define the main principles of performing this shot, and to determine the essential differences in individual types of topspin forehand. In total, 10 female high-level athletes participated in this study. The BTS analysis system was used with a novel model for the range-of-motion measurement. An acoustic sensor was attached to the racket for identification of a ball-racket contact. Players, performing topspin forehand, attempt to achieve maximal racket velocity based on the principles of proximal-to-distal sequences and summation of speed with a stretch-shortening character of cycle...
July 1, 2018: Motor Control
https://www.readbyqxmd.com/read/29486667/which-measures-of-online-control-are-least-sensitive-to-offline-processes
#20
John de Grosbois, Luc Tremblay
A major challenge to the measurement of online control is the contamination by offline, planning-based processes. The current study examined the sensitivity of four measures of online control to offline changes in reaching performance induced by prism adaptation and terminal feedback. These measures included the squared Z scores (Z2 ) of correlations of limb position at 75% movement time versus movement end, variable error, time after peak velocity, and a frequency-domain analysis (pPower). The results indicated that variable error and time after peak velocity were sensitive to the prism adaptation...
July 1, 2018: Motor Control
journal
journal
32732
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"