Vision Influence on Whole‐Body Human Vibration Comfort Levels

Abstract

The well being of people needs to be a priority in the modern world. In that respect, vibration cannot be one more cause of stress. Besides that, vibration comfort is very important, since high levels may cause health or even tasks' accomplishment problems. Several parameters may influence the levels of vibration a human being supports. Among them, one can mention the influence of gender, age, corporeal mass index (CMI), temperature, humor, anxiety, hearing, posture, vision, etc. The first three parameters mentioned were already investigated in previous studies undertaken by GRAVI (Group of Acoustics and Vibration) researchers. In this paper, the influence of vision is evaluated. The main objective with this series of tests performed is to try to quantify in a future the influence of each parameter in a global vibration comfort level. Conclusions are presented for the parameter investigated.

Analysis of EEG Signals in a Patient with Spastic Cerebral Palsy Undergone Dolphin-Assisted Therapies

“…Hence, there is an increment of the Power Spectral Density when dolphin is closer to the patient, and thus a certain resonance frequency is yielded in specific parts of the patient's body (see Table I). Therefore, the main issue is that dolphin's sonar produces resonance of different parts of the human body, yielding effects on the nervous system of the patient via psychological changes [33]. This process is attributed to the generation of endorphin in the brain, bringing about the activation of collagen molecules throughout the body.…”

Role of Neuron-Specific Splicing Regulators as Modifiers of Neurofibromatosis Type 1

“…Although some have published values for resonance frequencies of various body parts (e.g., Duarte & Pereira, 2006), meaning those frequencies where the body shows the greatest response to a force input, others have considered the variables of transmissibility, energy absorption (or absorbed power), apparent mass, and impedance to be more indicative of how the body will respond to a given vibration in a given context Lundström, Holmlund, & Lindberg, 1998;Matsumoto & Griffin, 1998;Paddan & Griffin, 1998). In general, this latter group of measures bases analyses on empirical measurements of the motion input as well as the kinematics of the resulting body motion, thus accounting for any filtering-type effects that the body has on force input.…”

“…Although less information is currently available to characterize a broad spectrum of individuals across variations in race, gender, and age, some values have been published to provide at least a reference for the general order of magnitude. Table 2 provides some of these values, indicating resonance frequencies for individual upper body segments as published by Duarte and Pereira (2006). Note the general relationship between body segment size and the resonant frequency.…”

A numerical and experimental investigation of a special type of floating-slab tracks

“…The dynamic interactions between the components of railway tracks influence the structural integrity of the track and the levels of noise and vibrations transmitted to buildings in proximity. Several studies have shown that such vibrations have significant effects on human health and comfort [1][2][3][4]. Railway-induced vibrations can also damage sensitive equipment [5,6] and historical buildings [7].…”