scholarly journals Development of Postural Control in Healthy Children: A Functional Approach

2005 ◽  
Vol 12 (2-3) ◽  
pp. 109-118 ◽  
Author(s):  
Christine Assaiante ◽  
Sophie Mallau ◽  
Sébastien Viel ◽  
Marianne Jover ◽  
Christina Schmitz
Keyword(s):  
Postural Control ◽  
Reference Frame ◽  
Balance Control ◽  
Experimental Studies ◽  
Healthy Children ◽  
Adaptation Capacity ◽  
Complex Motor ◽  
Long Time ◽  
Young Subjects ◽  
Biomechanical Constraints

From a set of experimental studies showing how intersegmental coordination develops during childhood in various posturokinetic tasks, we have established a repertoire of equilibrium strategies in the course of ontogenesis. The experimental data demonstrate that the first reference frame used for the organization of balance control during locomotion is the pelvis, especially in young children. Head stabilization during posturokinetic activities, particularly locomotion, constitutes a complex motor skill requiring a long time to develop during childhood. When studying the emergence of postural strategies, it is essential to distinguish between results that can be explained by biomechanical reasons strictly and those reflecting the maturation of the central nervous system (CNS). To address this problem, we have studied our young subjects in situations requiring various types of adaptation. The studies dealing with adaptation of postural strategies aimed at testing short and long-term adaptation capacity of the CNS during imposed transient external biomechanical constraints in healthy children, and during chronic internal constraints in children with skeletal pathologies. In addition to maintenance of balance, another function of posture is to ensure the orientation of a body segment. It appears that the control of orientation and the control of balance both require the trunk as an initial reference frame involving a development from egocentric to exocentric postural control. It is concluded that the first step for children consists in building a repertoire of postural strategies, and the second step consists in learning to select the most appropriate postural strategy, depending on the ability to anticipate the consequence of the movement in order to maintain balance control and the efficiency of the task.

scholarly journals Visual and vestibular functioning, and age and surgery effects on postural control in healthy children with vertical strabismus

2018 ◽  
Vol 10 ◽  
pp. 251584141878800 ◽  
Author(s):  
Sergio Zanini ◽  
Claudia Cordaro ◽  
Lucia Martucci ◽  
Ivana Del Piero ◽  
Simonetta Geotti ◽  
...  
Keyword(s):  
Postural Control ◽  
Evoked Potentials ◽  
Experimental Studies ◽  
Case Series ◽  
Healthy Children ◽  
Clinical Protocol ◽  
Ocular Surgery ◽  
Clear Cut ◽  
Vestibular Evoked Potentials ◽  
Age Range

Purpose: To describe visual and vestibular functioning and the effects of age and surgery effects on postural control in healthy children with vertical strabismus. Design: This is a comparative case series. Methods: We evaluated participants at the Scientific Institute Eugenio Medea during routine clinical activities. We enrolled 30 consecutive children/adolescents (age range 4–13 years) with isolated vertical strabismus, with and without corrective surgery. Participants were split into four subgroups according to age (4–8 years versus 9–13 years) and ocular surgery (surgery versus no surgery). The clinical protocol included ophthalmological, orthoptic, neurological, physiatrical, otolaryngological, and vestibular evaluations, and the instrumental protocol included ocular cyclotorsions assessment, posturography, and vestibular myogenic-evoked potentials. Main outcome measures of the study were the prevalence of study-relevant orthopedic, ocular, vestibular, and posturographic abnormalities. Results: Among the overall largely variable findings across patients’ groups, we found some interesting trends: larger binocular vision and convergence disorders in younger children, smaller prevalence of asymmetric vestibular-evoked potentials in operated children, less posturographic abnormalities in younger children. No clear-cut beneficial effect of surgery was found on all clinical and instrumental parameters considered, despite good re-alignment of the eyes. Conclusion: The pathophysiology of postural control in vertical strabismus is extremely complex and above the potential of this study design and should be specifically addressed in deeper experimental studies.

Postural Control during Downward Head Movements in Young Subjects

2007 ◽  
Vol 29 (3) ◽  
pp. 205-212
Author(s):  
Junko Fukushima ◽  
Tadayoshi Asaka ◽  
Natsumi Ikeda ◽  
Yumi Ito
Keyword(s):  
Postural Control ◽  
Head Movements ◽  
Young Subjects

scholarly journals Kittel’s Brief Comments Endorsing an Alternative View on Barium Titanate

2021 ◽  
Vol 6 (1) ◽  
pp. 10
Author(s):  
Akira Kojima
Keyword(s):  
State Physics ◽  
Barium Titanate ◽  
Cell Structure ◽  
Experimental Studies ◽  
Alternative View ◽  
Solid State Physics ◽  
Text Book ◽  
Long Time ◽  
Unit Cell Structure ◽  
Displacive Type

Charles Kittel has written a masterpiece book, “Introduction to Solid State Physics” (ISSP). He mentions in the chapter on ferroelectrics in detail that barium titanate is the typical displacive-type ferroelectric compound where the Ti4+ displacement develops a dipole moment, which has made a deep impression in our mind. The author’s group, however, has arrived at an alternative viewpoint on the unit cell structure of barium titanate based on their exhaustive experimental studies. Accordingly, the author sent his relevant papers in 2006 and 2007 to Kittel. He endorsed the results frankly with reminiscence. He mentioned revising the ferroelectric chapter of ISSP according the author’s suggestions. It appears to be admissible to publish details now after Kittel has passed away. A long time misunderstanding of the phase transition in barium titanate is due to the text book knowledge of ISSP.

The Contribution of Hearing and Hearing Loss to Balance Control

2016 ◽  
Vol 21 (4) ◽  
pp. 195-202 ◽  
Author(s):  
Jessica Vitkovic ◽  
Carmen Le ◽  
Su-Ling Lee ◽  
Ross A. Clark
Keyword(s):  
Hearing Loss ◽  
Postural Control ◽  
Postural Sway ◽  
Balance Control ◽  
Normal Hearing ◽  
Centre Of Pressure ◽  
Auditory Cues ◽  
Sensory Weighting ◽  
Acoustic Environments ◽  
Pressure Analysis

This study investigated the hypothesis that a hearing ‘map' of our surroundings is used to maintain balance control. We investigated the effects of sound on postural sway using centre of pressure analysis in 50 subjects with normal hearing, 28 with hearing loss and 19 with vestibular dysfunction. The acoustic environments utilized sound cues that were either present or absent. It was found that auditory cues are utilized by subjects with normal hearing to improve postural sway. The ability to utilize sound for postural control is diminished when there is a hearing loss, but this appears to be overcome by the use of a hearing aid. Patients with additional vestibular deficits exploit auditory cues to a greater degree, suggesting that sensory weighting to enhance the use of auditory cues may be applied when there is diminished sensory redundancy.

Airborne Infection Isolation Rooms – A Review of Experimental Studies

2011 ◽  
Vol 20 (6) ◽  
pp. 584-594 ◽  
Author(s):  
Marko Hyttinen ◽  
Anna Rautio ◽  
Pertti Pasanen ◽  
Tiina Reponen ◽  
G. Scott Earnest ◽  
...  
Keyword(s):  
Disease Transmission ◽  
Experimental Studies ◽  
Air Leakage ◽  
Crucial Issue ◽  
Actual Knowledge ◽  
Airborne Infection ◽  
The Us ◽  
Air Cleaners ◽  
Long Time ◽  
Save Energy

Ventilation guidelines for airborne infection isolation rooms (AIIRs) are highly variable in different countries indicating lack of actual knowledge about the guidance needed. However, US guidelines for AIIRs are extensive and have been widely adopted outside the US. AIIR performance has also been evaluated in numerous studies. For a long time, the aim has mainly been to evaluate how well the existing AIIRs meet US guidelines. For historical reasons, mixing-type ventilation has been emphasised and attention has been paid to air exchange rates, although the use of auxiliary devices, such as portable room-air cleaners and ultraviolet germicidal irradiation systems, has also been examined. Recently, the scope of the investigations has been widened. The most crucial issue is to minimise the potential for disease transmission and prevent the escape of contaminated air from the AIIR. Airflow direction inside the AIIR is also important and AIIRs minimise air leakage to save energy. On the other hand, it has been observed that efficient containment can be achieved even by using simple and inexpensive construction by considering pressure differential and air flow patterns. Nevertheless, additional research is needed to assist hospitals with improving their preparedness to cope with the threat of pandemics by building and using effective AIIRs.

scholarly journals MODERN CONCEPTION AS TO THE FUNCTIONAL MORPHOLOGY OF THE OLFACTORY SYSTEM AND ITS CHANGES UNDER THE INFLUENCE OF SOME EXOGENOUS POLLUTANTS

2019 ◽  
Vol 23 (3-4) ◽  
pp. 37-40
Author(s):  
A.D. Shkodina ◽  
R.M. Hrinko ◽  
I.I. Starchenko
Keyword(s):  
Environmental Factors ◽  
Olfactory Epithelium ◽  
Functional Organization ◽  
Morphological Changes ◽  
Human Life ◽  
Experimental Studies ◽  
Experimental Models ◽  
Functional Changes ◽  
Olfactory Analyzer ◽  
Long Time

The interaction between a body and an environment provides the main aspects of human life. The study of the functional structure of the olfactory analyzer plays an important role both in clinical and in experimental studies, but the question of its features in humans needs detailed research. The paper presents the modern data of the structural and functional organization of the olfactory analyzer. Particular attention is paid to the structural organization of olfactory bulbs as most complicated and least studied component of the olfactory analyzer. The morphological and functional changes of the olfactory analyzer are developing in some diseases and in action of adverse environmental factors are described while the accentuation is placed on the differences of the mechanism in the pathogenesis of damage to the olfactory analyzer, depending on the nature of the influence of pathogenic factors. In this way as the result of short-term intense effects of the pollutant, irreversible atrophic changes are primarily affected to the olfactory epithelium, thus, to some extent, preventing the spread of the toxin to other analyzer structures. Conversely, a long-term exposure to low doses usually retains the functional activity of the olfactory epithelium, while harmful substances penetrate the central unit of the olfactory analyzer. In such cases, the olfactory dysfunction can be diagnosed after a long time after the start of the cohort with certain pollutants. Currently, studies of the influence of exogenous toxins on various parts of the olfactory analyzer on animal experimental models are quite active. At the same time, the issue of functional and morphological changes in various structural components of the human olfactory analyzer under the influence of negative environmental factors remains poorly understood and requires further morphological and biochemical studies, in order to be able to further develop effective therapeutic and prophylactic means.

scholarly journals HUBUNGAN PIJAT BAYI DENGAN PERKEMBANGAN MOTORIK BAYI USIA 1 – 12 BULAN DI DESA PUNDUNGSARI BULU SUKOHARJO

2015 ◽  
Vol 3 (1) ◽  
Author(s):  
Rahayu Setyaningsih ◽  
Kristiani Eka Prasetyo Wat ◽  
Asri Utami
Keyword(s):  
Rapid Growth ◽  
Experimental Studies ◽  
Sampling Technique ◽  
Test Results ◽  
Infant Massage ◽  
Chi Square ◽  
The Public ◽  
Touch Therapy ◽  
Mother And Child ◽  
Long Time

AbstractIntroduction: Infant massage is a touch therapy oldest known to the public. Infant massage is one of the communication between mother and child is communication through touch. Infant massage has been known to man for a long time and reduced down - generations. Age 1-12 months is a period of rapid growth that is traversed by the child, including motoric development. Infant massage can provide a stimulus to promote weight and to increase motoric development.The purpose: Of this study was to correlate of infant massage and motoric development in infants aged 1-12 months in District Pundungsari Bulu Sukoharjo.The subjects: Were mother with infants aged 1-12 months, in the District Pundungsari. Sampling is done with total sampling technique. They are 33 sample in this research.Methods: This study was a non-experimental studies, correlation approach. Data obtained by the method of questionare, which is mother has filled the questionare about baby massage in infants aged 1-12 months and motoric development. The data have been collected and analyzed by chi square with p= 0.05. The research found that respondents do baby massage with continue and not continue and motoric development found delayed, normal and advance. After the test results obtained chi square p 0.000 to p <0.05, which means Ha accepted and Ho rejected.The conclusion: Of this study is infant massage correlate with motoric development in infants aged 1-12 months in District Pundungsari Bulu Sukoharjo.Keywords: Infant massage, motoric development

scholarly journals Relativistic Effects in the Rotation of Jupiter’s Inner Satellites

2020 ◽  
Vol 55 (3) ◽  
pp. 118-129
Author(s):  
Vladimir V. Pashkevich ◽  
Andrey N. Vershkov
Keyword(s):  
Solar System ◽  
Reference Frame ◽  
Central Body ◽  
Relativistic Effects ◽  
Euler Angles ◽  
Coordinate Systems ◽  
Geodetic Precession ◽  
Long Time ◽  
Celestial Reference Frame ◽  
Jupiter’S Satellites

AbstractThe most significant relativistic effects (the geodetic precession and the geodetic nutation, which consist of the effect of the geodetic rotation) in the rotation of Jupiter’s inner satellites were investigated in this research. The calculations of the most essential secular and periodic terms of the geodetic rotation were carried out by the method for studying any bodies of the solar system with long-time ephemeris. As a result, for these Jupiter’s satellites, these terms of their geodetic rotation were first determined in the rotational elements with respect to the International Celestial Reference Frame (ICRF) equator and the equinox of the J2000.0 and in the Euler angles relative to their proper coordinate systems. The study shows that in the solar system there are objects with significant geodetic rotation, due primarily to their proximity to the central body, and not to its mass.

scholarly journals A theoretical verification of the integral fluctuation theorem for accelerated colloidal systems in the long-time limit

2021 ◽  
Author(s):  
Yash Lokare
Keyword(s):  
Steady State ◽  
Time Scales ◽  
Numerical Study ◽  
Quantitative Description ◽  
Experimental Studies ◽  
Fluctuation Theorem ◽  
Nonequilibrium Steady States ◽  
Small Scale ◽  
Colloidal Systems ◽  
Long Time

A quantitative description of the violation of the second law of thermodynamics in relatively small classical systems and over short time scales comes from the fluctuation-dissipation theorem. It has been well established both theoretically and experimentally, the validity of the fluctuation theorem to small scale systems that are disturbed from their initial equilibrium states. Some experimental studies in the past have also explored the validity of the fluctuation theorem to nonequilibrium steady states at long time scales in the asymptotic limit. To this end, a theoretical and/or purely numerical model of the integral fluctuation theorem has been presented. An approximate general expression for the dissipation function has been derived for accelerated colloidal systems trapped/confined in power-law traps. Thereafter, a colloidal particle trapped in a harmonic potential (generated by an accelerating one-dimensional optical trap) and undergoing Brownian motion has been considered for the numerical study. A toy model of a quartic potential trap in addition to the harmonic trap has also been considered for the numerical study. The results presented herein show that the integral fluctuation theorem applies not only to equilibrium steady state distributions but also to nonequilibrium steady state distributions of colloidal systems in accelerated frames of reference over long time scales.

The image of oneself and the world in the drawings of healthy children and children with oncology

2020 ◽  
pp. 44-52
Author(s):  
Elena Menzul ◽  
Nataliya Ryazantseva ◽  
Larisa Karaseva
Keyword(s):  
World View ◽  
Personal Meaning ◽  
Healthy Children ◽  
Emotional Experiences ◽  
The World ◽  
Long Time

The drawing activity of children has attracted the attention of researchers for a long time as a possible method for studying the inner state of a child, his/her ability to reflect the world view and the world of his/her emotional experiences. Analyzing children's works, many authors pay attention to how the reality surrounding the child is conveyed in them and what personal meaning is put into it.

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