Abstract：
:The modelling of the parallel bars-gymnast system is considered. A 2D frontal plane model for the parallel bars apparatus is developed, enabling technique and injury analysis to be undertaken when combined with an interacting gymnast body model. We also demonstrate how such a gymnast body model may be combined with the parallel bars model by use of a simplifying symmetry consideration about the gymnast's sagittal plane. This symmetry consideration implies that just half the gymnast body and one of the two bars, are needed in the total model. We found that midpoint vertical parallel bars dynamics may be modelled by three parameters, using a single damped spring-mass model with linear force-displacement characteristics. Horizontally, as opposed to the vertical direction, bar endpoints accounted for a substantial part (35%) of the midpoint movement, demanding two serially connected springs for this direction. One spring represented the absolute horizontal movement of the bar endpoints, while the other spring represented the superimposed horizontal movement of bar midpoint relative to the endpoints. Both horizontal springs had the same characteristics as the vertical spring, giving a total of nine parameters for the three-spring bar model. Bar parameters were estimated by fitting the modelled bar movements to corresponding measured movements caused by a 140 kg lateral pendulum below the bar midpoint. Validation was then undertaken by comparing model-predicted bar movements to corresponding measurements using lateral pendulums of 100 kg and 60 kg, respectively. Finally, a gymnast handstand position was modelled and used to compare model-predicted and measured bar oscillations following a somersault backwards to a handstand position. The model gave convincing predictions of bar movements both for the 100 kg (1 period, RMS error of 7.0 mm) and 60 kg (1 period, RMS error of 3.7 mm) pendulums, as well as for the somersault landing (2 periods, RMS error of 8.1 mm).
journal_name
Hum Mov Scijournal_title
Human movement scienceauthors
Linge S,Hallingstad O,Solberg Fdoi
10.1016/j.humov.2005.11.008subject
Has Abstractpub_date
2006-04-01 00:00:00pages
221-37issue
2eissn
0167-9457issn
1872-7646pii
S0167-9457(05)00116-8journal_volume
25pub_type
杂志文章abstract：:Turning while walking is a crucial component of locomotion, often performed on irregular surfaces with little planning time. Turns can be difficult for some older adults due to physiological age-related changes. Two different turning strategies have been identified in the literature. During step turns, which are biome...
journal_title：Human movement science
pub_type： 杂志文章
doi：10.1016/j.humov.2019.06.002
更新日期：2019-06-13 00:00:00
abstract：:It has been suggested that the observation of another person's action affects the behavior of the observer because the observation of action leads to the excitation of similar response codes in the observer. It is unknown, however, if one must witness the action or if it is sufficient for one to believe that the other...
journal_title：Human movement science
pub_type： 杂志文章
doi：10.1016/j.humov.2007.06.003
更新日期：2007-12-01 00:00:00
abstract：:With the mounting realization that variability is an inevitable part of human behavior comes the need to integrate this phenomenon in concomitant models and theories of motor control. Among other things, this has resulted in a debate throughout the last decades about the origin of variability in behavior, the outcome ...
journal_title：Human movement science
pub_type： 杂志文章,评审
doi：10.1016/j.humov.2013.01.008
更新日期：2013-08-01 00:00:00
abstract：:Perceptual-motor calibration has been described as a mapping between perception and action, which is relevant to distinguish possible from impossible opportunities for action. To avoid movement errors, it is relevant to rapidly calibrate to immediate changes in capabilities and therefore this study sought to explain i...
journal_title：Human movement science
pub_type： 杂志文章,评审
doi：10.1016/j.humov.2016.11.004
更新日期：2017-01-01 00:00:00
abstract：:This research addresses the question: what is the risk of fall initiation at a certain human posture? There are postures from which no one is able to keep their balance and a fall will surely initiate (risk=1), and others from which everyone may regain their stability (risk=0). In other postures, only a portion of peo...
journal_title：Human movement science
pub_type： 杂志文章
doi：10.1016/j.humov.2012.11.009
更新日期：2013-10-01 00:00:00
abstract：:The aim of this work was to analyze the postural sway of volleyball players in bipedal quiet stance. The center of pressure (CoP) was measured in 46 athletes and 42 non-athlete controls. Each subject was tested in 10 different conditions, 5 with their eyes open and 5 with their eyes closed. Volleyball players showed g...
journal_title：Human movement science
pub_type： 杂志文章
doi：10.1016/j.humov.2013.01.002
更新日期：2013-06-01 00:00:00
abstract：:Using dynamical modeling tools, the aim of the study was to establish a minimal model reproducing leg movements in cross-country skiing, and to evaluate the eventual adjustments of this model with fatigue. The participants (N=8) skied on a treadmill at 90% of their maximal oxygen consumption, up to exhaustion, using t...
journal_title：Human movement science
pub_type： 杂志文章
doi：10.1016/j.humov.2010.03.001
更新日期：2010-08-01 00:00:00
abstract：:While humans rely on vision during navigation, they are also competent at navigating non-visually. However, non-visual navigation over large distances is not very accurate and can accumulate error. Currently, it is unclear whether this accumulation of error is due to the visual estimate of the distance or to the locom...
journal_title：Human movement science
pub_type： 杂志文章
doi：10.1016/j.humov.2013.04.003
更新日期：2013-08-01 00:00:00
abstract：:Principles of motor control and learning such as bilateral coordination and task-specificity, are increasingly incorporated in the design of upper extremity rehabilitation protocols for stroke survivors. Yet most studies investigating the efficacy of new protocols report composite scores of standardized tests, such as...
journal_title：Human movement science
pub_type： 杂志文章,随机对照试验
doi：10.1016/j.humov.2008.03.006
更新日期：2008-10-01 00:00:00
abstract：:Clinicians use forward bending and backward return in routine clinical examinations for evaluating spine mobility. The magnitude and timing of lumbar spine and pelvic contributions have been described in the literature as lumbopelvic rhythm. There is still limited knowledge about the factors which can determinate lumb...
journal_title：Human movement science
pub_type： 杂志文章,评审
doi：10.1016/j.humov.2018.02.008
更新日期：2018-04-01 00:00:00
abstract：PURPOSE:The understanding of fatigue of the human motor system is important in the fields of ergonomics, sport, rehabilitation and neurology. In order to understand the interactions between fatigue and reaction time, we evaluated the effects of two different fatiguing tasks on reaction time. METHODS:83 healthy subject...
journal_title：Human movement science
pub_type： 杂志文章
doi：10.1016/j.humov.2020.102679
更新日期：2020-10-01 00:00:00
abstract：: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 t...
journal_title：Human movement science
pub_type： 杂志文章
doi：10.1016/j.humov.2017.08.005
更新日期：2017-10-01 00:00:00
abstract：:Participants were asked to walk and run continuously (5 min trials) at speeds associated with preferred gait transition speeds. During slow running the local dynamic stability of the head was decreased compared with fast walking, with the reverse being true for the local dynamic stability of the ankle. The standard de...
journal_title：Human movement science
pub_type： 杂志文章
doi：10.1016/j.humov.2008.09.001
更新日期：2009-02-01 00:00:00
abstract：:In this experimental study, we tested whether athletes' judgments of affordances and of environmental features vary with psychological momentum (PM). We recruited golf, hockey, and tennis players, who were assigned to a positive or negative momentum condition. We designed a golf course on which participants made pract...
journal_title：Human movement science
pub_type： 杂志文章
doi：10.1016/j.humov.2018.10.009
更新日期：2018-12-01 00:00:00
abstract：:Automated movements adjusting postural control may be hampered during musculoskeletal pain leaving a risk of incomplete control of balance. This study investigated the effect of experimental muscle pain on anticipatory postural adjustments by reaction task movements. While standing, nine healthy males performed two re...
journal_title：Human movement science
pub_type： 杂志文章
doi：10.1016/j.humov.2013.01.009
更新日期：2013-12-01 00:00:00
abstract：:Meeting the challenge of assembling coherent organizations of very many muscles characterizes a functional level of biological movement systems referred to as the level of muscular-articular links or synergies. The present article examines the issues confronting the forming, regulating, and ordering of synergies and t...
journal_title：Human movement science
pub_type： 杂志文章,评审
doi：10.1016/j.humov.2007.04.002
更新日期：2007-08-01 00:00:00
abstract：:Prior research has found that the level of regularity in the output of numerous physiological systems is lowest in healthy young adults and higher in groups such as the elderly and those with various diseases. Vascular restriction has been found to stimulate exercise induced responses, including greater muscle activat...
journal_title：Human movement science
pub_type： 杂志文章
doi：10.1016/j.humov.2013.01.007
更新日期：2013-06-01 00:00:00
abstract：:This review describes a novel view on stages in motor learning based on recent developments of the notion of synergies, the uncontrolled manifold hypothesis, and the equilibrium-point hypothesis (referent configuration) that allow to merge these notions into a single scheme of motor control. The principle of abundance...
journal_title：Human movement science
pub_type： 杂志文章,评审
doi：10.1016/j.humov.2009.11.002
更新日期：2010-10-01 00:00:00
abstract：:The present study investigated Bernstein's [The co-ordination and regulation of movements, 1967] proposal regarding the three stages of learning in the changing coordination and control of redundant joint-space degrees of freedom. Six participants practiced maintaining balance on a moving platform that was sinusoidall...
journal_title：Human movement science
pub_type： 杂志文章
doi：10.1016/s0167-9457(02)00177-x
更新日期：2003-02-01 00:00:00
abstract：:In virtual reality it is easy to control the visual cues that tell us about an object's shape. However, it is much harder to provide realistic virtual haptic feedback when grasping virtual objects. In this study we examined the role of haptic feedback when grasping (virtual) cylinders with an elliptical circumference....
journal_title：Human movement science
pub_type： 杂志文章
doi：10.1016/j.humov.2008.07.003
更新日期：2008-12-01 00:00:00
abstract：:Two reliable findings in discrete, rapid aimed movements are that reaction time increases with decrease in target diameter (for the short-length movements), and reaction time is not affected by movement length [Journal of Experimental Psychology, Human Perception and Performance 104 (2) (1975) 147]. Participants norma...
journal_title：Human movement science
pub_type： 杂志文章
doi：10.1016/s0167-9457(01)00070-7
更新日期：2001-11-01 00:00:00
abstract：:Previous studies have found that rates of attention deficit hyperactivity disorder (ADHD) and developmental coordination disorder (DCD) are very similar, both being approximately 7% in sample populations [Kadesjö, B., & Gillberg, C. (1999). Developmental coordination disorder in Swedish 7-year-old children. Journal of...
journal_title：Human movement science
pub_type： 杂志文章
doi：10.1016/j.humov.2005.10.006
更新日期：2006-02-01 00:00:00
abstract：:Following total knee replacement (TKR), patients often persist in maladaptive motor behavior which they developed before surgery to cope with symptoms of osteoarthritis. An important challenge in physical therapy is to detect, recognize and change such undesired movement behavior. The goal of this study was to measure...
journal_title：Human movement science
pub_type： 杂志文章
doi：10.1016/j.humov.2020.102623
更新日期：2020-06-01 00:00:00
abstract：:The present study explored whether rapid stepping is influenced by the coordination of an arm pointing task. Nine participants were instructed to (a) point the index finger of the dominant arm towards a target from the standing posture, (b) initiate a rapid forward step with the contralateral leg, and (c) synchronize ...
journal_title：Human movement science
pub_type： 杂志文章
doi：10.1016/j.humov.2007.03.003
更新日期：2007-06-01 00:00:00
abstract：OBJECTIVE:To compare the parameters of gait kinematics of older adults with cognitive impairment who live in community dwellings or those living or spending most of the time in non-family environment settings. METHODS:The sample was composed of 33 older adults of both sexes with cognitive impairment. Participants were...
journal_title：Human movement science
pub_type： 杂志文章
doi：10.1016/j.humov.2020.102747
更新日期：2021-02-01 00:00:00
abstract：:Position sense has been found to decay as a function of the time delay the limb remains in a static position prior to movement onset. Position sense has also been found to deteriorate as a function of aging, with increased reliance on vision by the elderly. This study investigated whether the pointing kinematics of el...
journal_title：Human movement science
pub_type： 杂志文章
doi：10.1016/s0167-9457(02)00160-4
更新日期：2003-04-01 00:00:00
abstract：:This study investigated the inter- and intra-lap variability in stroking parameters during sprint competition to gain insight into the race management of speed (S), stroke length (SL), stroke rate (SR) and stroke index (SI) in relation to gender. The stroking parameters of 32 male and 32 female finalists in the 2015 W...
journal_title：Human movement science
pub_type： 杂志文章
doi：10.1016/j.humov.2018.08.002
更新日期：2018-10-01 00:00:00
abstract：:Jump height is increased when performers are given external focus instructions, relative to an internal focus or no focus instructions (Wulf & Dufek, 2009; Wulf, Zachry, Granados, & Dufek, 2007). The purpose of present study was to examine possible underlying neurophysiological mechanisms of this effect by using elect...
journal_title：Human movement science
pub_type： 杂志文章
doi：10.1016/j.humov.2009.11.008
更新日期：2010-06-01 00:00:00
abstract：:Regarding our voluntary control of movement, if identification of joint position, that is independent of the starting condition, is stronger than kinaesthetic movement reproduction, that implies knowledge of the starting position and movement's length for accuracy, is still a matter of debate in motor control theories...
journal_title：Human movement science
pub_type： 杂志文章,随机对照试验
doi：10.1016/j.humov.2018.08.006
更新日期：2018-12-01 00:00:00
abstract：:The experiment was conducted to determine the influence of mirror movements in bimanual coordination during life span. Children, young adults, and older adults were instructed to perform a continuous 1:2 bimanual coordination task by performing flexion-extension wrist movements over 30s where symmetrical and non-symme...
journal_title：Human movement science
pub_type： 杂志文章
doi：10.1016/j.humov.2016.01.004
更新日期：2016-04-01 00:00:00
