Wyniki wyszukiwania - BazTech

1

Impact of multi-task on symptomatic patient affected by chronical vestibular disorders

Regrain E., Regnault P., Kirtley Ch., Shamshirband S., Chays A., Boyer F.-C., Taiar R.

Acta of Bioengineering and Biomechanics

|

2016

|

Vol. 18, no. 3

123--129

EN

Purpose: After a vestibular deficit some patients may be affected by chronical postural instability. The aim of this study was to identify the emotional and cognitive factors of these symptomatic patients. In particular, the double cognitive task and the anxiety disorder were identified by our patients. Through a retrospective study, 14 patients (65.4 ±18 years) participated in the experiment. Method: The experimentation consists in the study of the standing position of our patients through the aggregate of the trajectories of the center of pressure (COP) using a force plate device. With the aim of isolating the emotional and cognitive influence, this experimentation was defined in two conditions. In the first one, the patients were asked to maintain their balance without additional tasks. In the second one, the patients were submitted to an additional cognitive arithmetic task. The stabilogram surface, length (the forward and backward displacement distance during deviations in COP), lateral and the antero-posterior deviations were assessed. Results: Our results showed an increase of postural instability of patients affected by chronical vestibular disorders when submitted to the double task. The patients submitted to the cognitive task present a larger surface of activity in comparison with the free-task one (Wilcoxon test p-value equals p = 0.0453). In addition, their displacements inside this area are more important (p = 0.0338). The COP of all our patients deviated forward in the presence of the double task. Conclusion: The increase in instability during the double cognitive task could be explained by an additional stress caused by the desire to make a success of the cognitive task.

2

Importance of the functional examination in lower extremities in patients with rheumatoid arthritis

Wareńczak A., Lisiński P., Huber J.

Acta of Bioengineering and Biomechanics

|

2014

|

Vol. 16, no. 3

103--110

EN

This paper deals with evaluation the lower extremity efficiency and balance in rheumatoid arthritis (RA) patients. Own authors test (LLFT-lower extremities functional test) and balance tests during normal standing and tandem positions with eyes opened or closed were used. Twelve patients with RA and fifteen controls for comparison were examined. Center feet of pressure dislocation on platform in normal standing with eyes open, normal standing with eyes closed, tandem left foot in front and tandem right foot in front positions and further dynamic balance tests on three different boards were analyzed. Visual Analogue Scale monitored level of pain after each LLFT task. There was found a relation between intensity of pain and overloading of joints in particular tasks, resulting in lower extremities dysfunction. Significant disbalance in medio-lateral direction during normal standing with eyes closed and tandem right foot in front positions and also in anterior-posterior direction in tandem right foot in front position during static balance tests was found. Correlations showed that patient’s age, disease’s duration and Steinbrocker Functional Classes have an influence on parameters of balance tests. Results indicate that complex dysfunction of lower extremities causes disbalance of posture in static conditions.

3

The effect of short- and long-term vibration training on postural stability in men

Piecha M., Król P., Juras G., Sobota G., Polak A., Bacik B.

Acta of Bioengineering and Biomechanics

|

2013

|

Vol. 15, no. 3

29--35

EN

The study aimed to establish the short- and long-term effects of vibration on postural stability in young men. A single set of exercises and a 4-week vibration training were assessed for their impact on the center of foot pressure (COP) sway. The sample consisted of 49 male subjects randomly allocated to seven comparative groups, six of which exercised on a vibration platform whose parameters were set individually for the groups. Group VII was the control group. The stabilographic signal was recorded before the test commenced, after a single application of vibration, before the last set of exercises of the 4-week vibration training, immediately afterwards, as well as one week and one month after the training ended. The subjects were exposed to vibration 3 times a week for 4 weeks. Both a single application of vibration and the 4-week vibration training had an effect on all parameter values, but most changes were statistically insignificant. Group III was the only one where the COP sway in the anterior-posterior direction significantly increased after a single exposure to vibration and significantly decreased in both anterior-posterior and medio-lateral planes one week after vibration training compared with the pre-test recordings.

4

Nowy „schemat ciała” w następstwie wychylenia w postawie stojącej?

Koźlik A.

Aktualne Problemy Biomechaniki

|

2007

|

z. 1

119--124

PL

Celem pracy było określenie, czy odległość pomiędzy wypadkową siły reakcji podłoża (COP) a osią obrotu stawu skokowo goleniowego w pozycji stojącej jest modyfikowana w zależności od wcześniej wykonanego zadania ruchowego. Analizowano parametry amplitudowe stabliogramu w czterech kolejno następujących po sobie próbach. Zaobserwowano 3 schematy zachowań różniące się dokładnością odtworzenia pozycji wyjściowej. Grupa 1 - badani, którzy powracając do pozycji spoczynkowej minęli punkt wyjściowy. Grupa 2 badani, którzy powracają nic dotarli do punktu wyjściowego. Grupa 3 - badani, którzy powracając dokładnie odwzorowali położenie spoczynkowe.

EN

The aim of work was the answer, is the distance between center of pressure (COP) and axis rotation of ankle in standing position is modify after making physical task. In experiment were analysed amplitude parameters in four tests. It appeared that students with were examined were using 3 different type of behavior. In group 1 (n = 13) after the physical task definitely the distance between center of pressure (COP) and axis rotation of ankle was shorter. In group 2 (n = 6) the distance was longer and in group 3 (n = 8) statistically the distance was precisely the same.

5

Tłumienie kołysania postawy po przyjęciu nowej pozycji ciała

Koźlik A., Pakuła P.

Zeszyty Naukowe Katedry Mechaniki Stosowanej / Politechnika Śląska

|

2006

|

z. 30

149-152

PL

Celem pracy było określenie, czy wielkość wychwiań ciała w pozycji stojącej zmienia się w czasie. Analizowano parametry amplitudowe stabliogramu w trzech pozycjach ciała. Wykazano, że po przyjęciu nowej pozycji kołysanie postawy maleje.

EN

The aim of work was the answer, is the range of postural sway in standing position change in time. In experiment were analysed amplitude parameters of human stability in three body positions. It appeared that after selected new body position the postural sway started to expire.

6

Optimization of human's balancing locomotion on the accelerated platform using compensation algorithms

Sadeghi Mehr M., Naderi D., Farahpour R., Gholami V.

Zeszyty Naukowe Katedry Mechaniki Stosowanej / Politechnika Śląska

|

2006

|

z. 26

309-314

EN

Most of the people over 65 years old, experience falling due to muscular-nerve system disorder. Control of posture for this group of people can be recovered by rehabilitation exercises. This study suggests an optimum kinematic motion pattern to recover stability and balance of the human body due to a suddenly base acceleration without separation of the foot from the ground, using statically and dynamically compensation algorithms. The work was done by mathematically simulation of a biomechanical multi-links model in the sagittal plane. The results showed that a continuous smooth motion in every joint can lead to recover the stability of the model