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Human Movement Science

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https://www.readbyqxmd.com/read/28829950/analysis-of-gait-patterns-pre-and-post-single-event-multilevel-surgery-in-children-with-cerebral-palsy-by-means-of-offset-wise-movement-analysis-profile-and-linear-fit-method
#1
Andrea Ancillao, Marjolein M van der Krogt, Annemieke I Buizer, Melinda M Witbreuk, Paolo Cappa, Jaap Harlaar
Gait analysis is used for the assessment of walking ability of children with cerebral palsy (CP), to inform clinical decision making and to quantify changes after treatment. To simplify gait analysis interpretation and to quantify deviations from normality, some quantitative synthetic descriptors were developed over the years, such as the Movement Analysis Profile (MAP) and the Linear Fit Method (LFM), but their interpretation is not always straightforward. The aims of this work were to: (i) study gait changes, by means of synthetic descriptors, in children with CP that underwent Single Event Multilevel Surgery; (ii) compare the MAP and the LFM on these patients; (iii) design a new index that may overcome the limitations of the previous methods, i...
August 19, 2017: Human Movement Science
https://www.readbyqxmd.com/read/28822263/the-most-important-factor-in-producing-clubhead-speed-in-golf
#2
Christopher Joyce
Substantial experiential research into x-factor, and to a lesser extent crunch-factor has been undertaken with the aim of increasing clubhead speed. However, a direct comparison of the golf swing kinematics associated with each 'factor' has not, and possible differences when using a driver compared to an iron. Fifteen low handicap male golfers who displayed a modern swing had their golf swing kinematic data measured when hitting their own driver and five-iron, using a 10-camera motion analysis system operating at 250Hz...
August 16, 2017: Human Movement Science
https://www.readbyqxmd.com/read/28810172/changes-in-interlimb-coordination-during-walking-and-grasping-task-in-older-adult-fallers-and-non-fallers
#3
Natalia Madalena Rinaldi, Richard van Emmerik, Renato Moraes
The aim of this study was to investigate interlimb coordination in young and older adults with and without a history of falls during the combined task of walking and prehension with different levels of manual task difficulty. Participants walked on a pathway and grasped a dowel. A vector coding technique evaluated coordination patterns. The coordination pattern was not affected by the difficulty level of the manual task. Older adults seemed to prioritize the movement of the right shoulder to grasp the dowel and then 'froze' the movement of the other joint (left shoulder) not directly involved in the grasping task...
August 12, 2017: Human Movement Science
https://www.readbyqxmd.com/read/28810171/properties-of-intermodal-transfer-after-dual-visuo-and-auditory-motor-adaptation
#4
Gerd Schmitz, Otmar L Bock
Previous work documented that sensorimotor adaptation transfers between sensory modalities: When subjects adapt with one arm to a visuomotor distortion while responding to visual targets, they also appear to be adapted when they are subsequently tested with auditory targets. Vice versa, when they adapt to an auditory-motor distortion while pointing to auditory targets, they appear to be adapted when they are subsequently tested with visual targets. Therefore, it was concluded that visuomotor as well as auditory-motor adaptation use the same adaptation mechanism...
August 12, 2017: Human Movement Science
https://www.readbyqxmd.com/read/28810170/the-role-of-speed-and-incline-in-the-spontaneous-choice-of-technique-in-classical-roller-skiing
#5
Gertjan Ettema, Espen Kveli, Magne Øksnes, Øyvind Sandbakk
Cross-country skiers change technique depending on terrain (incline) and effort (work rate; speed at a particular incline or resistance). The literature is not unequivocal about the influence of incline or speed on the choice of technique, i.e., which of these act as a 'control parameter'. Identifying task related control parameters for spontaneous technique shifts assists elucidating which mechanisms are active for triggering technique transitions. The aim of this study was to investigate whether speed or incline acted as such control parameter for technique shifts during classic style roller skiing...
August 12, 2017: Human Movement Science
https://www.readbyqxmd.com/read/28810173/effect-of-haptic-sensory-input-through-a-fluttering-cloth-on-tandem-gait-performance
#6
Kazushige Oshita, Sumio Yano
This study investigated the effects of haptic sensory input through a fluttering cloth on balance control during locomotion. Twenty-one healthy men performed a tandem gait test for 4m with their eyes closed under two different conditions: (1) wearing only half or short tights (HT-condition), or (2) wearing a fluttering cloth that was wrapped around the waist and extended to the lower leg (CLOTH-condition). Participants performed two trials with a 3-min rest period. The first trial involved the HT-condition, whereas the second trial involved either the CLOTH-condition (n=11), or the HT-condition again (n=10)...
August 11, 2017: Human Movement Science
https://www.readbyqxmd.com/read/28802896/head-flexion-and-different-walking-speeds-do-not-affect-gait-stability-in-older-females
#7
Amy Maslivec, Theodoros M Bampouras, Susan Dewhurst
Head flexion is destabilizing in older individuals during quiet stance, yet the effect head flexion has on gait is not known. The study examined whether head flexion and gait parameters were altered when walking freely and fixed to a visual target, at different walking speeds. 15 young (23±4years) and 16 older (76±6years) healthy females walked at three different walking speeds (slow, comfortable, and fast) under two visual conditions (natural and fixed [focusing on a visual target set at eye level]). Head flexion was assessed using 2D video analysis, whilst gait parameters (step length, double support time, step time, and gait stability ratio) were recorded during a 9m flat walkway...
August 10, 2017: Human Movement Science
https://www.readbyqxmd.com/read/28780477/reliability-of-forward-head-posture-evaluation-while-sitting-standing-walking-and-running
#8
Chang-Hyung Lee, Sojeong Lee, Gwanseob Shin
Forward head posture has been evaluated mostly by visual observation or simple non-invasive measurements without a standardized evaluation method or protocol. In this experimental study, the reliability of existing forward head-posture measurement methods was evaluated by computing the intra-class correlation coefficients of three different head-position variables (two horizontal gap variables and one head-orientation variable) in seven different posture conditions from 20 asymptomatic participants. The position variables of the head were measured three times using a three-dimensional motion capture system while sitting comfortably, sitting with the back straight, standing comfortably, standing with the back straight, walking at 4 and 6km/h on a treadmill, and running at 8km/h on a treadmill...
August 3, 2017: Human Movement Science
https://www.readbyqxmd.com/read/28779598/motor-actions-and-spatiotemporal-changes-by-weight-divisions-of-mixed-martial-arts-applications-for-training
#9
Bianca Miarka, Ciro José Brito, Fábio Dal Bello, John Amtmann
This study compared motor actions and spatiotemporal changes between weight divisions from Ultimate Fighting Championship (UFC™), conducting a practical application for mixed martial arts (MMA) training. For this, we analyzed 2814 rounds of all weight divisions by motor actions and spatiotemporal changes according actions and time of the Keeping distance, Clinch and Groundwork combat phases. We observed differences between weight divisions in the keeping distance on stand-up combat (p≤0.001; with lower time in Featherweight 131...
August 2, 2017: Human Movement Science
https://www.readbyqxmd.com/read/28763703/multifractal-foundations-of-visually-guided-aiming-and-adaptation-to-prismatic-perturbation
#10
Nicole S Carver, Danica Bojovic, Damian G Kelty-Stephen
Visually-guided action of tossing to a target allows examining coordination between mechanical information for maintaining posture while throwing and visual information for aiming. Previous research indicates that relationships between visual and mechanical information persist in tossing behavior long enough for mechanical cues to prompt recall of past visual impressions. Multifractal analysis might model the long-term coordinations among movement components as visual information changes. We asked 32 adult participants (6 female, 25 male, one not conforming to gender binary; aged M=19...
July 29, 2017: Human Movement Science
https://www.readbyqxmd.com/read/28763702/a-wearable-vibrotactile-biofeedback-system-improves-balance-control-of-healthy-young-adults-following-perturbations-from-quiet-stance
#11
Christina Zong-Hao Ma, Winson Chiu-Chun Lee
Maintaining postural equilibrium requires fast reactions and constant adjustments of the center of mass (CoM) position to prevent falls, especially when there is a sudden perturbation of the support surface. During this study, a newly developed wearable feedback system provided immediate vibrotactile clues to users based on plantar force measurement, in an attempt to reduce reaction time and CoM displacement in response to a perturbation of the floor. Ten healthy young adults participated in this study. They stood on a support surface, which suddenly moved in one of four horizontal directions (forward, backward, left and right), with the biofeedback system turned on or off...
July 29, 2017: Human Movement Science
https://www.readbyqxmd.com/read/28753458/alteration-of-rhythmic-unimanual-tapping-and-anti-phase-bimanual-coordination-in-alzheimer-s-disease-a-sign-of-inter-hemispheric-disconnection
#12
Elodie Martin, Mélody Blais, Jean-Michel Albaret, Jérémie Pariente, Jessica Tallet
Little attention is paid to motor control in Alzheimer's disease (AD) although it is a relevant sign of central nervous system integrity and functioning. In particular, unimanual and bimanual tapping is a relevant paradigm because it requires intra- and inter-hemispheric transfer (IHT). Previous results indicate that both unimanual and anti-phase tapping requires more IHT than in-phase tapping, especially produced without external stimulation. The aim of the present study was to test the production of unimanual, bimanual in-phase and anti-phase tapping with a synchronization-continuation paradigm with and without visual stimulation in AD patients (N=9) and control participants (N=12)...
July 25, 2017: Human Movement Science
https://www.readbyqxmd.com/read/28750259/impact-of-series-length-on-statistical-precision-and-sensitivity-of-autocorrelation-assessment-in-human-locomotion
#13
T B Warlop, B Bollens, Ch Detrembleur, G Stoquart, T Lejeune, F Crevecoeur
Long-range autocorrelations (LRA) are a robust feature of rhythmic movements, which may provide important information about neural control and potentially constitute a powerful marker of dysfunction. A clear difficulty associated with the assessment of LRA is that it requires a large number of cycles to generate reliable results. Here we investigate how series length impacts the reliability of LRA assessment. A total of 94 time series extracted from walking or cycling tasks were re-assessed with series length varying from 64 to 512 data points...
July 24, 2017: Human Movement Science
https://www.readbyqxmd.com/read/28750258/myoelectronic-signal-based-methodology-for-the-analysis-of-handwritten-signatures
#14
Cristina Carmona-Duarte, Rafael de Torres-Peralta, Moises Diaz, Miguel A Ferrer, Marcos Martin-Rincon
With the overall aim of improving the synthesis of handwritten signatures, we have studied how muscle activation depends on handwriting style for both text and flourish. Surface electromyographic (EMG) signals from a set of twelve arm and trunk muscles were recorded in synchronization with handwriting produced on a digital Tablet. Correlations between these EMG signals and handwritten trajectory signals were analyzed so as to define the sequence of muscles activated during the different parts of the signature...
July 24, 2017: Human Movement Science
https://www.readbyqxmd.com/read/28750260/effects-of-dual-task-difficulty-in-motor-and-cognitive-performance-differences-between-adults-and-adolescents
#15
Pilar Bustillo-Casero, Israel Villarrasa-Sapiña, Xavier García-Massó
In the present study our aim was to compare dual-task performance in thirteen adolescents and fifteen young adults while concurrently performing a cognitive and a motor task. The postural control variables were obtained under three different conditions: i) bipedal stance, ii) tandem stance and iii) unipedal stance. The cognitive task consisted of a backward digit span test in which the participants were asked to memorize a sequence of numbers and then repeat the number in reverse order at three different difficulty levels (i...
July 21, 2017: Human Movement Science
https://www.readbyqxmd.com/read/28709045/enhancing-performance-expectancies-through-visual-illusions-facilitates-motor-learning-in-children
#16
Moslem Bahmani, Gabriele Wulf, Farhad Ghadiri, Saeed Karimi, Rebecca Lewthwaite
In a recent study by Chauvel, Wulf, and Maquestiaux (2015), golf putting performance was found to be affected by the Ebbinghaus illusion. Specifically, adult participants demonstrated more effective learning when they practiced with a hole that was surrounded by small circles, making it look larger, than when the hole was surrounded by large circles, making it look smaller. The present study examined whether this learning advantage would generalize to children who are assumed to be less sensitive to the visual illusion...
July 11, 2017: Human Movement Science
https://www.readbyqxmd.com/read/28692837/influence-of-gait-mode-and-body-orientation-on-following-a-walking-avatar
#17
L Rens A Meerhoff, Harjo J de Poel, Tim W D Jowett, Chris Button
Regulating distance with a moving object or person is a key component of human movement and of skillful interpersonal coordination. The current set of experiments aimed to assess the role of gait mode and body orientation on distance regulation using a cyclical locomotor tracking task in which participants followed a virtual leader. In the first experiment, participants moved in the backward-forward direction while the body orientation of the virtual leader was manipulated (i.e., facing towards, or away from the follower), hence imposing an incongruence in gait mode between leader and follower...
July 7, 2017: Human Movement Science
https://www.readbyqxmd.com/read/28692836/multi-body-dynamic-coupling-mechanism-for-generating-throwing-arm-velocity-during-baseball-pitching
#18
Kozo Naito, Tokio Takagi, Hideaki Kubota, Takeo Maruyama
The purpose of this study was to identify the detailed mechanism how the maximum throwing arm endpoint velocity is determined by the muscular torques and non-muscular interactive torques from the perspective of the dynamic coupling among the trunk, thorax and throwing and non-throwing arm segments. The pitching movements of ten male collegiate baseball pitchers were measured by a three-dimensional motion capture system. Using the induced-segmental velocity analysis (IVA) developed in this study, the maximum fingertip velocity of the throwing arm (MFV) was decomposed into each contribution of the muscular torques, passive motion-dependent torques due to gyroscopic moment, Coriolis force and centrifugal force, and other interactive torque components...
July 7, 2017: Human Movement Science
https://www.readbyqxmd.com/read/28688302/effects-of-gait-speed-on-the-body-s-center-of-mass-motion-relative-to-the-center-of-pressure-during-over-ground-walking
#19
Hsuan-Lun Lu, Mei-Ying Kuo, Chu-Fen Chang, Tung-Wu Lu, Shih-Wun Hong
Preferred walking speed (PWS) reflects the integrated performance of the relevant physiological sub-systems, including energy expenditure. It remains unclear whether the PWS during over-ground walking is chosen to optimize one's balance control because studies on the effects of speed on the body's balance control have been limited. The current study aimed to bridge the gap by quantifying the effects of the walking speed on the body's center of mass (COM) motion relative to the center of pressure (COP) in terms of the changes and directness of the COM-COP inclination angle (IA) and its rate of change (RCIA)...
July 5, 2017: Human Movement Science
https://www.readbyqxmd.com/read/28688301/field-location-and-player-roles-as-constraints-on-emergent-1-vs-1-interpersonal-patterns-of-play-in-football
#20
T Laakso, B Travassos, J Liukkonen, K Davids
This study examined effects of player roles on interpersonal patterns of coordination that sustain decision-making in 1-vs-1 sub-phases of football in different field locations near the goal (left-, middle- and right zone). Participants were fifteen U-16yrs players from a local competitive amateur team. To measure interpersonal patterns of coordination in the 1-vs-1 dyads we recorded: (i) the relative distance value between each attacker and defender to the centre of the goal, and (ii), the relative angle between the centre of the goal, each defender and attacker...
July 5, 2017: Human Movement Science
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