Conventional spectral analyses of heart rate variability (HRV) have been limited to stationary signals and have not allowed the obtainment of information during transient autonomic cardiac responses. In the present study, we evaluated the ability of the short-time Fourier transform (STFT) method to detect transient changes in vagal effects on the heart. We derived high-frequency power (HFP, 0.2...

Conventional spectral analyses of heart rate variability (HRV) have been limited to stationary signals and have not allowed the obtainment of information during transient autonomic cardiac responses. In the present study, we evaluated the ability of the short-time Fourier transform (STFT) method to detect transient changes in vagal effects on the heart. We derived high frequency power (HFP, 0.2...

In this paper, we described an innovative methodology of recognizing four main postures namely standing, sitting, bending and lying position using correlation filter particularly Unconstrained Minimum Average Correlation Energy (UMACE). Initial results prove the UMACE filters offer significant potential in posture recognition task. The filter was subjected to a challenging task to recognize hum...

To increase the quality of citizens' lives, we designed a personalized smart chair system to recognize sitting behaviors. The can receive surface pressure data from sensor and provide feedback for guiding user towards proper postures. We used liquid state machine logistic regression classifier construct spiking neural network classifying 15 allow this read our into neurons, an algorithm encode ...

The measurement of volume pulse waves may be easily affected based on the measured position (different fingers or toes), body posture, as well as other factors. Therefore, interferences during measurement need to be removed. For this study, relevant parameters of volume pulse wave were obtained by changing the affecting factors. The data were analyzed in order to indicate the differences in vol...

This study was aimed at assessing the possible relationship between upright and sitting postures in healthy adults. The center of pressure trajectories from the force platform on which the subjects stood or sat were analyzed through a frequency analysis and modeled through the fractional Brownian motion framework. The same type of control process was involved during sitting and upright posture ...

What do infants learn when they learn to sit upright? We tested behavioral flexibility in learning to sit-the ability to adapt posture to changes in the environment-in 6- to 9-month-old infants sitting on forward and backward slopes. Infants began with slant at 0°; then slant increased in 2° increments until infants lost balance. Infants kept balance on impressively steep slopes, especially in ...

This literature review paper on ergonomically study about various work posture of visual display terminal operator like standing, sitting, combination of standing and sitting, effect of illumination, height of screen on workplace. These factors affects VDT operator on musculoskeletal disorder, neck, shoulder, eye strain and also on alertness, sleepiness, performance of VDT operator. This study ...

The value of change of posture in discriminating between the various added heart sounds has not been generally recognized. Moreover, apart from Evans' study in 1943, the influence of heart failure on the results has received little attention. Thayer (1909) stated that the physiological third heart sound was rarely heard in the erect posture, and Boyer, Eckstein, and Wiggers (1940) could record ...