Measuring system for recording driver reaction time was built, where computer sound card was used as a data acquisition system. An experiment in virtual environment was performed to evaluate proposed measuring system. Measured values of reaction time were similar to reported values of studies in real-world on public roads. In addition, significant changes of recorded physiological parameters during experiment indicate that subjects responded similar to the real-world situations. From our results we can conclude that the built low-cost measuring system was sufficient to detect response of a driver to a hazardous situation and is ready to be tested in real-world situations.

Back strength is an important parameter in low back pain studies. This study was to compare back extensor muscle strength such as maximal voluntary contraction (MVC), in elderly and young subjects using electromyography (EMG) and strength measurements. From three trials of isometric back strength measurement, average and maximum back strength values were obtained and compared. From the EMG experiment, muscle activities such as amplitude and frequency parameters were obtained and compared. However, it is often difficult to determine the true MVC as there can be errors caused by the experimenter and equipment. To obtain a more accurate estimation, several experiments were performed to find out the level of uncertainty.

Studying response of human autonomous nervous system is known to be useful to evaluate the emotional state, mental load and other psychological characteristics of man. In education, psychophysiological measurements can be used for studying children psychology in order to evaluate effectiveness of teaching methods, pupil’s relaxation, readiness to learn, comfort etc. A more relaxed child within a modern holistic teaching approach learns more and more effectively and is more motivated.
In this paper three experiments using a portable measuring system on elementary school pupils are described and evaluation of measuring anxiety (psychological effect, caused by awareness of being measured and resulting in changes of physiological signals) discussed.

To know load unbalance of body is an important concern for us to keep our physical health. The measurement of load unbalance of human body standing at a point is well known. But, on the other hand, it is more important to know the load unbalance in dairy life. This paper describes the system and method to measure load unbalance of human body to left or right side in jogging. The load unbalance is estimated by an inclination angle of body. The inclination angle is calculated by acceleration information from acceleration sensor attached on waist. As the measurement system is constructed as a portable and wearable unit, it is used indoor and outdoor.

Numerous experiments dealing with measuring of changes in human physiology due to mental stress are reported. In these researches, a stimulus is commonly employed to mentally, emotionally or cognitively affect the human subject and hers/his perception, resulting in changes in physiology. When evaluating such experiments from the metrology perspective, there is a clear lack of consistence and knowledge in assessing such psychological stimuli.
In this paper we are presenting an attempt to evaluate a commonly used colour word conflict test - the Stroop colour test, in several versions. The physiological results indicate that different versions of the Stroop test induce different levels of psychophysiological answer.