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Improved Temporal Resolution Heart Rate Variability Monitoring—Pilot Results of Non-Laboratory Experiments Targeting Future Assessment of Human–Computer Interaction

Hercegfi K.

International Journal of Occupational Safety and Ergonomics

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2011

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Vol. 17, No. 2

105--117

EN

This paper outlines the INTERFACE software ergonomic evaluation methodology and presents new validation results. The INTERFACE methodology is based on a simultaneous assessment of heart rate variability, skin conductance, and other data. The results of using this methodology on-site, in a non-laboratory environment indicate that it is potentially capable of identifying quality attributes of elements of software with a temporal resolution of only a few seconds. This paper presents pilot results supporting this hypothesis, showing empirical evidence in spite of the definitely non-laboratory environment: they indicate that the method is robust enough for practical usability tests. Naturally, in the future these pilot results will have to be followed with further laboratory-based verification and refinement. This paper focuses only on some characteristics of this method, not on an actual analysis of human–computer interaction; however, its results can establish a future practical and objective event-related analysis of software use.

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Hercegfi K.

International Journal of Occupational Safety and Ergonomics

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2011

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Vol. 17, No. 2

119--127

EN

This paper reports results of an assessment of e-learning materials with the INTERFACE software evaluation methodology. On the one hand, this method of analysis allows us to identify ergonomics problems; on the other, to decide to what extent those problems and their severity concern all users in general and to what extent they depend on the usersʼ type and characteristics. This is the first publication to apply the new marking, export, and statistical features of INTERFACE used in a quantitative analysis of heart rate variability (HRV) curves instead of earlier time-based statistics and qualitative methods. It presents correlations between event-related characteristics of human–computer interaction and the currently required mental effort showed with HRV. The paper also discusses correlations between variables and cognitive-style test scores which indicate the role of individual differences in ergonomics.

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Comfortability of the Bulletproof Vest: Quantitative Analysis by Heart Rate Variability

Lee K. C., Tai H. C., Chen H. C.

Fibres & Textiles in Eastern Europe

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2008

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Vol. 16, no. 6 (71)

39--43

EN

A verification of regressive models based on artificial neural networks and multiple regres- This paper provides an effective quantitative analysis system and verifies it. The system of heart rate variability utilizes the reactions of the cardiovascular system for the duration of excitation. The paper analyses the qualitative records of those signals of physiological reactions formed, such as heart rate variability, variation of blood pressure and some effective indexes in the time and frequency domains. The variation of the autonomic nervous system (ANS) is the fastest and most effective adjusting mechanism against the internal and external environment of a human body. Further, the heart rate variability (HRV) has the properties of non-invasion and ease and is able to determine quantitatively and differentiate the activities of the sympathetic nervous and the parasympathetic nervous systems. Through the experimental results, the activities of the sympathetic nervous and the parasympathetic nervous systems can display precisely the physiological comfortability with objective data by using the analytical instrument of heart rate variability. The comfortability of the bulletproof vest can be improved substantially by employing functional textiles such as moisture-absorbing, quick-drying, waterproof and breathable fabrics.

PL

Artykuł przedstawia efektywny system analizy ilościowej komfortu kamizelek kuloodpornych oraz jego weryfikację. System pomiaru zmian rytmu pracy serca wykorzystuje reakcje układu krążenia podczas eksperymentu analizując jakościowy zapis tego sygnału będący odpowiedzią na fizjologiczne reakcje. Analizuje się takie wielkości jak zmiany częstotliwości bicia serca, zmiana ciśnienia krwi oraz pewne parametry czasowe i częstotliwościowe pracy serca. Reakcje autonomicznego wegetatywnego układu nerwowego są najszybszym i najbardziej efektywnym mechanizmem pozwalającym badać wpływ wewnętrznych i zewnętrznych zmian bezpośredniego środowiska człowieka. Niezależnie od tego pomiar częstotliwości bicia serca jest typowym pomiarem bezinwazyjnym, łatwym do realizacji i identyfikacji. Pozwala on na zróżnicowanie aktywności układów nerwowych współczulnego i przywspółczulnego. Pomiary pozwalają na określenie fizjologicznego komfortu. Pomiary przeprowadzone z różnymi typami kamizelek kuloodpornych pozwoliły stwierdzić, że komfort może być większy poprzez zastosowanie specjalnych tekstyliów absorbujących wilgoć, szybkoschnących, wodoodpornych i dobrej przepuszczalności powietrza.