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The influence of sounds on posture control

Siedlecka B., Sobera M., Sikora A., Drzewowska I.

Acta of Bioengineering and Biomechanics

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2015

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Vol. 17, no. 3

95--102

EN

Purpose: It is still not clear which parameters of sound are the most significant for body reactions and whether the way of sound reception plays a role in body control. The purpose of this study was to determine the influence of frequency, spectrum and loudness of sounds on posture control in healthy women and men. Methods: The study subjects were 29 young adults who were submitted to a 60-second standing test in the bipedal stance on the force platform (AMTI). During the tests, 3 sinusoidal sounds with various timing and 2 musical sounds (guitar and piano) of the frequency 225 Hz, 1000 Hz and 4000 Hz were applied through headphones. The centre of pressure (COP) amplitude was registered. The sway area and COP mean velocity were computed. Results: It was found that high frequency sounds contributed to a significant decrease of sway area values. No significant influence of low frequency sounds on posture control was observed. The influence of the sound spectrum (timbre) on posture control is limited; only the crescendo spectrum improves the body stability in the bipedal stance and not the music spectrum as guitar and piano. The loudness of sound, although extremely high, is not the cause of postural control changing in relation to lower loudness. No effect of gender was found in terms of body stability under different sound conditions. Conclusion. Based on the results, it can be argued that, in general, in a bipedal stance in terms of stability high sound frequency improves posture control, whereas sound spectrum and intensity show a limited impact.

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System wspierający diagnostykę rodzin pszczelich

Krzywoszyja G., Andrzejewski G.

Pomiary Automatyka Kontrola

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2014

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R. 60, nr 11

978--981

PL

W artykule opisano konstrukcję systemu diagnostycznego, przeznaczonego do obserwacji zachowań pszczół. Główna część artykułu zawiera ocenę możliwości wydobycia informacji z dźwięków wytwarzanych przez pszczoły. Celem badań jest rozpoznanie stanów rodziny pszczelej oraz ich klasyfikacja. Opisano proces tworzenia modeli dźwięków oraz redukcji ich wymiarów. Przedstawiono obrazy otrzymane w diagnostycznej przestrzeni obserwacji stanów. W części końcowej opisano proces badania wybranego strumienia dźwięków i podjęto próbę interpretacji otrzymanych wyników.

EN

The design of a diagnostic system to observe the behavior of bees is described. The main part of the paper contains an assessment of the possibility of extracting information from sounds produced by bees. The aim of the study is to identify the states of colonies and their classification. It describes the processes modeling the sounds and reducing their size. Experimental images created in the diagnostic state space are shown. Finally, the process of testing a selected stream of sounds is outlined and an attempt to interpret the results is made.

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Method of the measurement of the time between centre of chosen sounds

Meyer A., Portalska H., Portalski M.

Elektronika : konstrukcje, technologie, zastosowania

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2008

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Vol. 49, nr 4

71-73

EN

In this paper the method and the program to measurement of time distances between middle points of speaking or playing sounds was presented. The proposed algorithm can be used to the score of the human state for persons with dysfunction of the central nervous system. The differences between results obtained for healthy persons an impaired persons was shown.

PL

Przedstawiono metodę i program służący do pomiaru czasów między środkami wyrazów lub wygrywanych dźwięków. Zaproponowany algorytm może być wykorzystany do oceny stanu osób z dysfunkcjami centralnego układu nerwowego. Pokazano różnice między wynikami osób zdrowych i chorych.