Abstract：
:A simple model of standing dives is used to investigate optimal jumping strategies from compliant surfaces and applied to springboard diving. The human model consists of a massless leg actuated by knee torque, and a lumped torso mass centered above the leg. The springboard is modeled as a mass-spring system. Maximum jump height for a male and a female is calculated by controlling knee-torque activation level as a function of time. The optimization includes constraints on minimum and maximum knee angle, rate of change of normalized activation level, and contact duration. Simulation results for maximal springboard depression and diver takeoff velocity agree reasonably with experimental data, even though larger board tip velocities are necessarily predicted earlier during the contact period. Qualitatively similar multiple pulse knee-torque activation patterns are found over various conditions and are different from those in rigid-surface jumping. The model is less able to predict accurately jump height at high fulcrum number since jumpers may have difficulty behaving optimally at non-preferred fulcrum settings. If strength is proportional to the product of mass and leg length, increasing leg length is more effective in increasing jump height than is increasing mass.
journal_name
Hum Mov Scijournal_title
Human movement scienceauthors
Cheng KB,Hubbard Mdoi
10.1016/j.humov.2004.04.002subject
Has Abstractpub_date
2004-06-01 00:00:00pages
35-48issue
1eissn
0167-9457issn
1872-7646pii
S0167945704000223journal_volume
23pub_type
杂志文章abstract：:We evaluate an improved method for individually determining neuromuscular properties in vivo. The method is based on Hill's equation used as a force law combined with Newton's equation of motion. To ensure the range of validity of Hill's equation, we first perform detailed investigations on in vitro single muscles. Th...
journal_title：Human movement science
pub_type： 杂志文章
doi：10.1016/j.humov.2007.01.006
更新日期：2007-04-01 00:00:00
abstract：:Patients with non-specific low back pain, or a similar disorder, may stiffen their trunk, which probably alters their walking coordination. To study the direct effects of increasing trunk stiffness, we experimentally increased trunk stiffness during walking, and compared the results with what is known from the literat...
journal_title：Human movement science
pub_type： 杂志文章
doi：10.1016/j.humov.2013.09.002
更新日期：2014-02-01 00:00:00
abstract：:The purpose of this study was to gain insight into the kinematics and kinetics of the vertical jump when jumping for different heights and to investigate movement effectiveness as a criterion for movement control in submaximal jumping. In order to jump high a countermovement is used and large body segments are rotated...
journal_title：Human movement science
pub_type： 杂志文章
doi：10.1016/j.humov.2003.11.001
更新日期：2004-04-01 00:00:00
abstract：:External load training (ELT) is a supplemental training method used to potentially improve high intensity task performance. However, biomechanical parameters such as ground reaction forces (GRF), ground contact time, and time to peak GRF during a drop vertical jump (DVJ) following an ELT intervention have yet to be ex...
journal_title：Human movement science
pub_type： 杂志文章
doi：10.1016/j.humov.2018.03.011
更新日期：2018-06-01 00:00:00
abstract：:Rhythmic limb movements have been shown to spontaneously coordinate with rhythmic environmental stimuli. Previous research has demonstrated how such entrainment depends on the difference between the movement periods of the limb and the stimulus, and on the degree to which the actor visually tracks the stimulus. Here w...
journal_title：Human movement science
pub_type： 杂志文章
doi：10.1016/j.humov.2011.08.002
更新日期：2012-06-01 00:00:00
abstract：:Developmental coordination disorder (DCD) is a neurodevelopmental condition affecting motor coordination in children and adults. Here, EEG signals elicited by visual and tactile stimuli were recorded while adult participants with and without probable DCD (pDCD) performed a motor task. The task cued reaching movements ...
journal_title：Human movement science
pub_type： 杂志文章
doi：10.1016/j.humov.2019.02.018
更新日期：2019-04-10 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：: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：: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 th...
journal_title：Human movement science
pub_type： 杂志文章
doi：10.1016/j.humov.2005.11.008
更新日期：2006-04-01 00:00:00
abstract：:Studies on myocontrolled assistive technology (AT), such as myoelectric prostheses, as well as rehabilitation practice using myoelectric controlled interfaces, commonly assume the existence of a general myocontrol skill. This is the skill to control myosignals in such a way that they are employable in multiple tasks. ...
journal_title：Human movement science
pub_type： 杂志文章
doi：10.1016/j.humov.2020.102592
更新日期：2020-04-01 00:00:00
abstract：:An experiment was designed to determine if the addition of a load altered the effector transfer profile observed in earlier experiments using multi-element movement sequences. The acquisition task required participants to move a horizontal lever (with 0.567kg load) to 16 sequentially projected targets. One group pract...
journal_title：Human movement science
pub_type： 杂志文章
doi：10.1016/j.humov.2009.08.001
更新日期：2010-02-01 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：:It was proposed that grasping is a relatively stereotyped movement pattern which can be subdivided into the components of manipulation, transport, and orientation of the hand. However, it is still a matter of debate whether these components are independent of each other. In three experiments we altered the start postu...
journal_title：Human movement science
pub_type： 杂志文章
doi：10.1016/j.humov.2009.03.001
更新日期：2009-08-01 00:00:00
abstract：:Previous evidence has shown that males and females display different gait kinematics which may influence the perception of emotions displayed through the same walking gait. We therefore investigated the influence of walker gender on the perception of happiness, sadness, anger and fear displayed through walking movemen...
journal_title：Human movement science
pub_type： 杂志文章
doi：10.1016/j.humov.2017.10.012
更新日期：2018-02-01 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：:Contrasted postural effects have been reported in dual-task protocols associating balance control and cognitive task that could be explained by the nature and the relative difficulty of the cognitive task and the biomechanical significance of the force platform data. To better assess their respective role, eleven heal...
journal_title：Human movement science
pub_type： 杂志文章
doi：10.1016/j.humov.2016.03.001
更新日期：2016-06-01 00:00:00
abstract：:Inter-segmental coordination can be influenced by chronic low back pain (CLBP). The sagittal plane lower extremities inter-segmental coordination pattern and variability, in conjunction with the pelvis and trunk, were assessed in subjects with and without non-specific CLBP during free-speed walking. Kinematic data wer...
journal_title：Human movement science
pub_type： 杂志文章
doi：10.1016/j.humov.2017.01.004
更新日期：2017-04-01 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 examined the extent to which game format (possession play, SSG-P and game with regular goals and goalkeepers, SSG-G) and the number of players (5, 7 and 10 a-side) influence the physical demands of small-sided soccer games (SSGs) in elite soccer players. Training data were collected during the in-sea...
journal_title：Human movement science
pub_type： 杂志文章
doi：10.1016/j.humov.2014.05.006
更新日期：2014-08-01 00:00:00
abstract：:The protracted maturation and development of speech articulation underlies the complexity of the skill, and suggests it may be an area susceptible to a general deficit in motor control. Recent research suggests a high co-occurrence between Developmental Coordination Disorder (DCD) and disordered speech production. Des...
journal_title：Human movement science
pub_type： 杂志文章
doi：10.1016/j.humov.2010.01.007
更新日期：2010-08-01 00:00:00
abstract：:Deficits in handwriting performance limit the school participation of children with developmental coordination disorder (DCD). The aim of this study was to compare the handwriting process and product characteristics of children with DCD to those of typically developing (TD) children in order to determine the best mean...
journal_title：Human movement science
pub_type： 杂志文章
doi：10.1016/j.humov.2008.02.011
更新日期：2008-04-01 00:00:00
abstract：:The present study addressed the effect of articular conformity of the shoulder joint on the stability of inter-joint coordination during circular drawing movements. Twelve right-handed participants performed clockwise and counter-clockwise circular drawing movements at nine locations in the mid-sagittal plane. The tas...
journal_title：Human movement science
pub_type： 杂志文章
doi：10.1016/s0167-9457(03)00045-9
更新日期：2003-08-01 00:00:00
abstract：:Soft tissues located throughout the human body are known to perform substantial mechanical work through wobbling and deforming, particularly following foot impacts with the ground. Yet, it is not known which specific tissues in the body are responsible for the majority of the soft tissue work. The purpose of this stud...
journal_title：Human movement science
pub_type： 杂志文章
doi：10.1016/j.humov.2019.01.008
更新日期：2019-04-01 00:00:00
abstract：:Recordings of the dominant finger during the reading of braille sentences by experienced readers reveal that the velocity of the finger changes frequently during the traverse of a line of text. These changes, not previously reported, involve a multitude of accelerations and decelerations, as well as reversals of direc...
journal_title：Human movement science
pub_type： 杂志文章
doi：10.1016/j.humov.2010.05.005
更新日期：2011-08-01 00:00:00
abstract：:Transcranial magnetic stimulation is increasingly used as a tool to explore cortical motor function in healthy subjects and in patients with neurological disease or injury. This review describes a "twin coil" TMS approach that allows investigation of time related changes in functional connectivity between primary moto...
journal_title：Human movement science
pub_type： 杂志文章,评审
doi：10.1016/j.humov.2010.07.007
更新日期：2011-10-01 00:00:00
abstract：:Motion analyses of lower body mechanics offer new schemas to address injury prevention strategies among baseball pitchers, where the influence of stride length remains unknown. This study examined the temporal effect of stride length at constituent pitching events and phases. Nineteen competitive pitchers (15 collegia...
journal_title：Human movement science
pub_type： 杂志文章
doi：10.1016/j.humov.2015.03.005
更新日期：2015-06-01 00:00:00
abstract：:Children with Developmental Coordination Disorder (DCD) have difficulty imagining movements such that they conform to the customary temporal constraints of real performance. We examined whether this ability is influenced by the choice of task used to elicit motor imagery (MI). Performance of typically developing (TD) ...
journal_title：Human movement science
pub_type： 杂志文章
doi：10.1016/j.humov.2015.08.016
更新日期：2015-12-01 00:00:00
abstract：:The purpose of this experimental study was to evaluate the effects of vision and stretching of the calf muscles on postural sway during quiet standing. Under pre-stretch conditions, participants stood on a force plate for 30s and the sway of the ground reaction force center of pressure was recorded. The following post...
journal_title：Human movement science
pub_type： 杂志文章
doi：10.1016/j.humov.2005.12.005
更新日期：2006-06-01 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
abstract：: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. Th...
journal_title：Human movement science
pub_type： 杂志文章
doi：10.1016/j.humov.2017.07.004
更新日期：2017-10-01 00:00:00
