scholarly journals Effects of increased anterior–posterior voluntary sway frequency on mechanical and perceived postural stability

2015 ◽  
Vol 39 ◽  
pp. 189-199 ◽  
Author(s):  
Teresa Martin Lorenzo ◽  
Jos Vanrenterghem
Keyword(s):  
Postural Stability ◽  
Voluntary Sway ◽  
Sway Frequency ◽  
Anterior Posterior

scholarly journals Effect of Toe Type on Static Balance in Ballet Dancers

2020 ◽  
Vol 35 (1) ◽  
pp. 35-41
Author(s):  
Momoko Kizawa ◽  
Toshito Yasuda ◽  
Hiroaki Shima ◽  
Katsunori Mori ◽  
Seiya Tsujinaka ◽  
...  
Keyword(s):  
Postural Stability ◽  
Center Of Pressure ◽  
Ground Reaction Forces ◽  
Bipedal Stance ◽  
Ballet Dancers ◽  
Maximum Range ◽  
Trajectory Length ◽  
Reaction Forces ◽  
Second Toe ◽  
Anterior Posterior

OBJECTIVES: Some forefoot shapes are ideal for pointe work in ballet. Egyptian-type, with the hallux being longest and the remaining toes decreasing in size, and Greek-type, with the second toe longer than the hallux, are considered less optimal for pointe work. Square-type, with the second toe the same length as the hallux, is considered optimal. This study compared postural stability in the bipedal stance, demi pointe, and en pointe between ballet dancers with the two toe types using a stabilometer. METHODS: This study included 25 Japanese ballet academy dancers who had received ballet lessons for at least 6 years. Toes were categorized into Egyptian-type (n=14) and square-type (n=11). Bipedal stance, demi pointe, and en pointe were tested. Center of pressure (COP) parameters were calculated from ground-reaction forces using two force plates: total trajectory length (LNG), velocities of anterior-posterior (VAP) and medial-lateral directions (VML), and maximum range displacement in the anterior-posterior (MAXAP) and medial-lateral directions (MAXML). Mann-Whitney U-tests were used to examine differences in COP parameters. RESULTS: There were no differences in parameters during bipedal stance or demi pointe. However, dancers with Egyptian-type toes had significantly greater LNG (p<0.01), VML (p=0.01), MAXML (p<0.01), and MAXAP (p=0.03) during en pointe. CONCLUSIONS: Ballet dancers with Egyptian-type toes demonstrated greater displacement in the medial-lateral and anterior-posterior directions during en pointe. Ballet dancers should be aware of toe types and sway character to optimize ballet training and balance.

scholarly journals Effect of Midsole Thickness of Dance Shoes on Dynamic Postural Stability

2013 ◽  
Vol 28 (4) ◽  
pp. 195-198 ◽  
Author(s):  
Matthew A Wyon ◽  
Ross Cloak ◽  
Josephine Lucas ◽  
Frances Clarke
Keyword(s):  
Postural Stability ◽  
Vertical Jump ◽  
Negative Influence ◽  
Vertical Jump Height ◽  
Negative Effect ◽  
Limb Kinematics ◽  
The Stability ◽  
Dynamic Postural Stability ◽  
Lower Limb Kinematics ◽  
Anterior Posterior

Landing from jumps is one of the main causes of injury within dance. A number of studies have reported a negative effect of shoe midsole thickness on lower limb kinematics during running due to the reduction in afferent sensory outputs from the foot’s epithelium. The purpose of this study was to examine the influence of varying midsole thicknesses in dance shoes on dynamic postural stability during a single-leg landing. Twenty-eight female undergraduate dance participants volunteered for the study. They carried out three trials under four conditions: barefoot and in ballet flats (2 mm midsole thickness), jazz shoes (7 mm), and dance sneakers (30 mm). The task consisted of a single-leg forward jump over a hurdle at 50% of their maximal vertical jump height, landing on a force platform, and balancing for 3 seconds. The stability indices for vertical stability (VSI), anterior-posterior stability (APSI), medial-lateral stability (MLSI), and dynamic postural stability (DPSI) were calculated using Wikstrom’s revised method. Significant differences were reported between the midsole thicknesses for both DPSI and VSI (p<0.01). No statistical differences were noted for the indices SPSI or MLSI. The present data agree with the running studies in that increased midsole thickness has a negative influence on landing stability.

scholarly journals LIMITATIONS OF VESTIBULAR REHABILITATION THERAPY USING DYNAMIC COMPUTERIZED POSTUROGRAPHY IN PATIENTS WITH CENTRAL VESTIBULAR SYNDROME

2015 ◽  
Vol 14 (3) ◽  
pp. 140-144
Author(s):  
Anamaria Andreia Ulmeanu ◽  
◽  
Andreea Didilescu ◽  
Raluca Enache ◽  
Gabriela Musat ◽  
...  
Keyword(s):  
Postural Stability ◽  
Maximum Amplitude ◽  
Vestibular Rehabilitation ◽  
Rehabilitation Program ◽  
Time Interval ◽  
Dynamic Posturography ◽  
Computerized Posturography ◽  
Risk Of Falls ◽  
Anterior Posterior

Objectives. To evaluate the importance of computerized dynamic posturography in vestibular rehabilitation (VR) of patients with central vestibular syndrome. Methods. The study included 30 patients with central vestibular syndrome with mean age (± SD) = 72.96 ± 11.97 which benefited from VR on a posturography platform between 2012-2014. All patients were evaluated using sensory integration tests. The parameters studied were: Romberg coefficient, statokinesigram (SKG), maximum amplitude of the degree of deviation in anterior-posterior and medial-lateral planes, SKG and the time interval of the rehabilitation program. Results. All of the analyzed parameters showed statistically significant results (p <0.05). The anterior-posterior and medio-lateral balance improved significantly at the end of the vestibular rehabilitation program and the parameters decreased to values close to normal. Conclusions. For patients with central vestibular syndrome, the vestibular rehabilitation improves postural stability and quality of life by reducing the risk of falls.

scholarly journals Assessing Postural Instability and Cybersickness Through Linear and Angular Displacement

2019 ◽  
pp. 001872081988125 ◽  
Author(s):  
Christopher Widdowson ◽  
Israel Becerra ◽  
Cameron Merrill ◽  
Ranxiao Frances Wang ◽  
Steven LaValle
Keyword(s):  
Postural Stability ◽  
Center Of Pressure ◽  
Angular Displacement ◽  
Convincing Evidence ◽  
Constant Speed ◽  
Fluctuation Analysis ◽  
Common Belief ◽  
Variable Speed ◽  
Severity Scores ◽  
Anterior Posterior

Objective: To examine the hypothesis that constant speed is more comfortable than variable speed profiles and may minimize cybersickness. Background: Current best practices for virtual reality (VR) content creation suggest keeping any form of acceleration as short and infrequent as possible to mitigate cybersickness. Methods: In Experiment 1, participants experienced repetitions of simulated linear motion, and in Experiment 2, they experienced repetitions of a circular motion. Three speed profiles were tested in each experiment. Each trial lasted 2 min while standing. Cybersickness was measured using the Simulator Sickness Questionnaire (SSQ) and operationally defined in terms of total severity scores. Postural stability was measured using a Wii Balance Board and operationally defined in terms of center of pressure (COP) path length. Postural measures were decomposed into anterior-posterior and medial-lateral axes and subjected to detrended fluctuation analysis. Results: For both experiments, no significant differences were observed between the three speed profiles in terms of cybersickness or postural stability, and none of the baseline postural measures could predict SSQ scores for the speed profile conditions. An axis effect was observed in both experiments such that normalized COP movement was significantly greater along the anterior-posterior axis than the medial-lateral axis. Conclusion: Results showed no convincing evidence to support the common belief that constant speed is more comfortable than variable speed profiles for scenarios typical of VR applications. Application: The present findings offer guidelines for the design of locomotion techniques involving traversal in VR environments.

Control of sway using vibrotactile feedback of body tilt in patients with moderate and severe postural control deficits

2005 ◽  
Vol 15 (5-6) ◽  
pp. 313-325
Author(s):  
C. Wall ◽  
E. Kentala
Keyword(s):  
Postural Control ◽  
Postural Stability ◽  
Body Motion ◽  
Body Tilt ◽  
Joint Movement ◽  
Foot Pressure ◽  
Eyes Closed ◽  
The Subject ◽  
Anterior Posterior ◽  
Vibrotactile Display

We evaluated the effect of the vibrotactile display of body tilt upon the postural stability of vestibulopathic subjects during standing. Two groups were studied: those with moderate and with severe deficits as defined by postural stability test scores. They were studied under conditions of distorted sensory input, and during anterior-posterior perturbations. Seventeen subjects, with uni- or bilateral vestibular deficits, as determined by electronystagmography and vertical axis rotation, were tested using Equitest® computerized dynamic posturography (CDP). Based on their performance on the CDP they were divided into two groups having either moderate (nine subjects) or severe (eight subjects) postural control deficits. Their anterior-posterior (A/P) body motion at the waist was measured with a micromechanical rate gyroscope and a linear accelerometer. The resulting tilt estimate was displayed by a vibrotactile array attached to the torso. The vibration served as a tilt feedback to the subject. The subject's performance was evaluated using the root-mean-square (RMS) of both the A/P body motion and center-of-pressure (CoP) estimates. Sensory distortions were introduced using the Equitest® Sensory Organization Tests (SOT). These tests are designed to distort A/P sensory inputs while standing. The SOT 5 distorts proprioceptive information about ankle joint movement, while the subject stands eyes-closed on a moving support platform that measures foot pressure. The SOT 6 adds distorted visual information about body movement instead of testing with eyes closed. Perturbations were introduced using the Equitest® Motor Control Tests (MCT). These move the support platform forward or backward with small, medium and large displacements in the horizontal plane while measuring subjects' foot pressure responses. We used the medium and large backward tests. Vibrotactile display of body tilt reduced the subjects' A/P sway and improved their balance. The finding was more evident for those subjects with severe deficits than those moderate ones. This trend was found for both SOT 5 and 6, as well as the medium and large MCT. Additionally, during the MCT, the peak deflection and mean recovery time also decreased significantly.

scholarly journals Efeitos do aumento da demanda inspiratória na estabilidade postural de idosos

2020 ◽  
Vol 2 (2) ◽  
pp. 14-20
Author(s):  
Karina Pitombeira Pereira Pedro
Keyword(s):  
Postural Stability ◽  
Stability Test ◽  
Balance System ◽  
Contrôle Postural ◽  
Biodex Balance System ◽  
Anterior Posterior

Introdução: O envelhecimento provoca alterações fisiológicas e funcionais, declínio das funções e da capacidade funcional, compromentendo a autonomia e mobilidade, aumentando o risco de quedas; também está associado a alterações biológicas que comprometem a função muscular inspiratória. Existem estudos que mostraram que toda musculatura do tronco trabalha conjuntamente com a função de proteger a coluna e preservar o controle postural, incluindo os músculos inspiratórios, porém, o papel do diafragma na respiração sempre toma precedência sobre a função postural. Objetivo: Verificar a influência dos músculos inspiratórios na estabilidade postural de idosos. Métodos: Três idosos, realizaram avaliação da pressão inspiratória máxima (PImáx), em seguida no Biodex Balance System SD realizaram o 'Postural Stability Test' (PST), nas condições de respiração livre e com respiração através do equipamento Power Breathe®, com sobrecarga de 50% do valor da PImáx. Resultados: Nas oscilações anterior-posterior todos os idosos apresentaram maior índice de instabilidade no teste com aumento da demanda inspiratória e para as oscilações direita-esquerda dois idosos apresentaram maior índice de instabilidade nessa condição. Conclusão: O aumento na demanda inspiratória fornecido pelo dispositivo Power Breathe® foi capaz de alterar a equilíbrio de idosos, ainda que devemos considerar que para resultados mais esclarecedores seja necessário a realização de um estudo maior.  

scholarly journals Postural instability in subjects with parkinson’s disease undergoing different sensory pitfalls

2017 ◽  
Vol 18 (4) ◽  
Author(s):  
Thaís Cardoso Da Silva ◽  
Lilian Assunção Felippe ◽  
Rodrigo Luiz Carregaro ◽  
Gustavo Christofoletti
Keyword(s):  
Parkinson’S Disease ◽  
Parkinson's Disease ◽  
Visual Information ◽  
Postural Stability ◽  
Body Position ◽  
Postural Instability ◽  
Sensory Stimuli ◽  
Eyes Closed ◽  
The Impact ◽  
Anterior Posterior

AbstractPurpose. Previous research has reported postural instability in subjects with Parkinson’s disease (PD). However, there are still doubts about the effect of sensory stimuli on one’s balance. In this study, we further investigated the stabilometric measures of individuals with PD, analysing the impact of different sensory stimuli on the outcomes. Methods. The total of 26 participants (13 with PD and 13 matched control peers) were submitted to 8 sensorimotor dynamics differing in relation to support base (30 cm vs. 10 cm, feet in parallel vs. feet in semi-tandem position), contact surface (foam vs. no foam), and visual conditions (eyes open vs. eyes closed). The measures used to assess one’s balance were body position in space, area of support base, and velocity of postural control. The variables involved the anterior-posterior and the mediolateral axes. Participants with PD were evaluated during the off medication state. Mann-Whitney U test and Friedman’s test were applied to carry out inter- and intra-group comparisons. Significance was set at 5%. Results. Cross-sectional analyses illustrated that tasks with sensory pitfalls impacted postural stability to a larger extent in PD subjects. The differences were found in anterior-posterior body position, area of support base, anterior-posterior velocity, and mediolateral velocity. Complementary analyses confirmed considerable instability on balance when support bases were small and visual information was absent (p < 0.05). Conclusions. The current results confirm worse postural stability response in subjects with PD and highlight that the interference of the sensory pitfalls is notable when individuals are off medication.

scholarly journals EFFECT OF COMPRESSION SOCKS ON POSTURAL BALANCE AMONG UNIVERSITY NETBALL PLAYERS

2020 ◽  
Vol 9 (2) ◽  
Author(s):  
Hosni Hasan
Keyword(s):  
Postural Balance ◽  
Postural Stability ◽  
Lower Limbs ◽  
Balance Test ◽  
Advanced Learners ◽  
Feedback Information ◽  
Key Variables ◽  
Stability Indexes ◽  
The University ◽  
Anterior Posterior

The purpose of this study was to observe the effects of wearing compression socks on postural balance in university netball players. Fourteen advanced learners' netball players performed three trials (20 seconds for each trial) of dynamic postural balance test on Biodex Stability System, in two socks conditions, (a) Normal Socks and (b) Compression Socks.  Data on overall, anterior/posterior and medial/lateral stability indexes were analyzed using Paired Sample T-tests. Results revealed that wearing compression materials significantly enhanced static and dynamic postural balance among the university netball players. The improvement in the key variables is likely to have occurred through enhanced somatosensory feedback information that was received the lower limbs to regulate better postural stability. It is suggested that compression socks can be used by netball players to improve their postural stability possibly during shooting performance.

scholarly journals Impact of pool training on balance of elderly individuals.

2020 ◽  
pp. 1-6
Author(s):  
Thyciane Mendonça de Andrade ◽  
Tathiana Maria Silva Rufino ◽  
Heleodório Honorato dos Santos ◽  
José Jamacy de Almeida Ferreira ◽  
Adriana Carla Costa Ribeiro Clementino ◽  
...  
Keyword(s):  
Fall Risk ◽  
Postural Stability ◽  
Dynamic Balance ◽  
Assessment Tools ◽  
Timed Up And Go ◽  
Elderly Individuals ◽  
Balance System ◽  
The Impact ◽  
Stability Score ◽  
Anterior Posterior

Objective: The aim of this study was to evaluate the impact of therapeutic pool training on static and dynamic balance of sedentary elderlies. Method: 10 elderly individuals took part in the study (63.10 ± 2.33 years), and they were submitted to 24 sessions of intervention, twice a week. The assessment tools were the Balance System, Timed Up and Go Test (TUGT) and the Berg Balance System (BBS). Results: The results showed that there was a significant decrease in the global postural stability, anterior/posterior and medial/lateral scores evaluated in the dynamic platform, as well as the static global postural stability score, reduction in time to perform the TUGT and increase in the Berg Balance System score. However, no significant differences were verified in the Postural Stability tests (anterior/posterior and medial/lateral with the static platform) and in the Fall Risk. Conclusion: The regular physical training in therapeutic pool can provide sedentary elderly individuals with a significant improvement in dynamic balance.

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