The features of occupational noise, in particular sound pressure levels, the type of noise and its frequency can be related to several physiological and non-physiological effects. However, studies about the influence of occupational noise on non-physiological effects are still scarce. The aim of this study was to investigate effect of intermittent sound patterns with different frequency on subjects’ performance and well-being. Five conditions were simulated and tested through an experimental study: Standard Condition (C0); Industrial noise with alert sounds at 500 Hz (C1); Industrial noise with alert sounds at 1000 Hz (C2); Industrial noise with alert sounds at 2000 Hz (C3); Industrial noise with alert sounds at 3000 Hz (C4). The noise levels were fixed at 45 ± 0.3 dB (A) in C0, and in 68 ± 0.5 dB (A) in the other conditions. The influence of noise on participants’ attention and short-term memory was assessed with the serial recall and response inhibition tests. Discomfort, stress and annoyance were accessed using Visual Analog Scales (VAS). Sixteen undergraduate students were included in this study (8 male; age: M = 22.25 yrs; SD = 0.7 yrs). Higher discomfort, stress and annoyance perceptions were found in condition C4; however, for task performance, no significant differences were found between conditions. This study provided important insights about the influence of different noise frequencies on subject’s performance and well-being. Future research should involve workers and how they react in the field to these conditions.
Título: Effects of Noise Frequency on Performance and Well-Being
Livro: Occupational and Environmental Safety and Health
Referência bibliográfica: Sousa, J., Monteiro, R., Tomé, D., & Rodrigues, M. (2019). Effects of Noise Frequency on Performance and Well-Being. Em Occupational and Environmental Safety and Health (Vol. 202, pp. 521–528). Springer. https://recipp.ipp.pt/handle/10400.22/14430
The trigeminal nerve is the most important nerve for the sensory and motor innervation of the oral system. A detailed knowledge of the trigeminal nerve is very important in the diagnosis and possible treatment of any type of orofacial or temporomandibular joint pain.
Título: Trigeminal nerve – interdisciplinarity between the areas of dentistry and audiology
Livro: Biodental Engineering V
Referência bibliográfica: Gentil, F., Campos, J. C. R., Parente, M., Santos, C. F., Areias, B., & Natal Jorge, R. M. (2019). Trigeminal nerve – interdisciplinarity between the areas of dentistry and audiology. Em J. Belinha, R. M. N. Jorge, J. C. R. Campos, M. A. P. Vaz, & J. M. R. S. Tavares (Eds.), Biodental Engineering V (1a, pp. 101–104).
The information that pass through the facial nerve allows the expression of our smile, joy or sadness, the “facial expression”. The face is the mark of our individuality. The facial nerve is responsible for innervation of the face muscles, like the previous two-thirds of the tongue and secretion of salivary and tears glands. The aim of this work is to remember the anatomy and physiology of the facial nerve, pathology and possible treatments of facial paralysis.
Título: Facial nerve: a clinical and anatomical review
Livro: Biodental Engineering V
Referência bibliográfica: Gentil, F., Campos, J. C. R., Parente, M., Santos, C. F., Areias, B., & Jorge, R. M. N. (2019). Facial nerve:a clinical and anatomical review. Em J. Belinha, R. M. N. Jorge, J. C. R. Campos, M. A. P. Vaz, & J. M. R. S. Tavares (Eds.), Biodental Engineering V (1a, pp. 105–108). CRC Press.
Vestibular rehabilitation is the most used therapy in cases of unbalance diagnosis. The vertigo symptoms are commonly related with inner ear diseases, affecting 20%-30% of the world population (von Brevern & Neuhauser, 2011). Its prevalence is higher in elders. In this work, a three-dimensional model of the semi-circular canal of the vestibular system, containing the fluids that pro-mote body balance, will be used. The Smoothed-Particle Hydrodynamics (SPH) method, a meshless particle method, will be the discrete numerical technique used to simulate the fluid behaviour. In the SPH the discretization is represented by particles with constant mass (G.R. Liu & Liu, 2003). The obtained results allow to understand the behaviour of the vestibular structures during the rehabilitation manoeuvres.
Título: Computational simulation of the vestibular system using a meshless particle method
Livro: Biodental Engineering V
Referência bibliográfica: Santos, C. F., Parente, M., Belinha, J., Natal Jorge, R. M., & Gentil, F. (2019). Computational simulation of the vestibular system using a meshless particle method. Em J. Belinha, R. M. N. Jorge, J. C. R. Campos, M. A. P. Vaz, & J. M. R. S. Tavares (Eds.), Biodental Engineering V (1a, pp. 129–134). CRC Press.
Each canal of the vestibular system of the inner ear is composed of a circular path of continuum fluid. Inside each semicircular canal, it is possible to find a cupula, a gelatinous body contain-ing sensory hair cells, and the focus of this work. One of the causes of vestibular disorders is the abnormal concentration of otoconia particles near the cupula. The accurate determination of the natural frequency (first vibration frequency) of the cupula would allow to know which external frequency could be induce to stimulate externally the cupula. Thus, theoretically, the resonance effect would induce physical vibra-tion to the cupula and disperse the otoconia particles, reducing the vertigo symptoms. Hence, in this wok, two-dimensional and three-dimensional geometrical models of the cupula were constructed. Then, a free vibration analysis was performed using three distinct numerical techniques, the Finite Element Method (FEM), and two meshless methods: the Radial Point Interpolation Meshless Method (RPIM) and the Natural Neighbour Radial Point Interpolation Method (NNRPIM).
Título: Using meshless methods to simulate the free vibrations of the cupula under pathological conditions
Livro: Biodental Engineering V
Referência bibliográfica: Santos, C. F., Parente, M., Belinha, J., Natal Jorge, R. M., & Gentil, F. (2019). Using meshless methods to simulate the free vibrations of the cupula under pathological conditions. Em J. Belinha, R. M. N. Jorge, J. C. R. Campos, M. A. P. Vaz, & J. M. R. S. Tavares (Eds.), Biodental Engineering V (1a, pp. 135–140). Taylor & Francis Group.
The vestibular system is located in the posterior portion of the inner ear. It is a key component to our sense of balance and movement. Any changes in this system can cause effects or symptoms such as dizziness, blurred vision, imbalance, and nausea, which are vertiginous syndrome indicators. Vertigo is reported as one of the most common symptoms in the world. It is considered the third most frequent complaint in medicine, transmitting a sense of inadequacy and insecurity. The aim of this work is to contribute to a better understanding of how the vestibular system works. This knowledge will help in the development of new techniques that will facilitate a more effective rehabilitation. Vestibular rehabilitation consists of a set of exercises, known as maneuvers, which can reduce and even eliminate symptoms of dizziness and imbalance associated with a vestibular disorder. In this work, a three-dimensional computational model of the vestibular system, containing the fluids promoting the body balance, will be presented. The smoothed-particle hydrodynamics (SPH) method will be used to simulate the fluid behavior. The results provide a better comprehension of the biomechanics of the vestibular system, which contribute to recover from any system disorders.
Título: Biomechanics of the vestibular system: A numerical simulation
Livro: Advances in Biomechanics and Tissue Regeneration
Referência bibliográfica: Santos, C. F., Belinha, J., Gentil, F., Parente, M., & Jorge, R. M. N. (2019). Biomechanics of the vestibular system: A numerical simulation. Em M. H. Doweidar (Ed.), Advances in Biomechanics and Tissue Regeneration (Academis Press, pp. 21–32). Academic Press. https://doi.org/10.1016/B978-0-12-816390-0.00002-9
