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NCT05548322
Our sense of touch is essential to explore our environment and experience life and is based on signals from receptors in the body that are sensitive to different types of stimulation. The TACTHUM projects aims to investigate the fundamental firing of mechanoreceptors in the body to various external stimuli, with an end-aim to better understand the human somatosensory system and to apply this knowledge to provide comprehensive sensory feedback in prosthetics. We have a vast system of peripheral receptors in the skin and muscles that provide us with exquisitely detailed information about our everyday interactions. When there is injury to a body part, such as in amputation, there is a significant loss of somatosensory input. Prosthetic devices have greatly developmed in the past few years, especially with the introduction of useful sensory feedback. However, there is a lot to discover both about the workings of the somatosensory system and how to recreate this to give feedback in a prosthetic device. The main objective of the TACTHUM project is to understand how to recover and apply useful somatosensory feedback in prostheses for amputees. There are a number of other sub-objectives, to: 1. Determine how tactile mechanoreceptors encode the texture of natural surfaces during passive and active exploration. 2. Investigate how our sense of touch varies with emotional state. 3. Explore what happens to our sense of touch when we explore surfaces at different temperatures. 4. Understand the origin of our perception of humidity. 5. Investigate differences in the encoding of tactile information with age. 6. Determine the perceptions generated by the stimulation of single tactile afferents. 7. Study changes in spontaneous activity and responses to tactile stimulation on the residual limb of amputees. To accomplish these objectives, we will primarily use the technique of microneurography, in vivo recordings from peripheral nerves, to gain direct information about the firing of peripheral neurons in humans. In conjunction with this, we will use a variety of mechanical and thermal stimuli to excite somatosensory fibers and register the activity of other physiological and perceptual measures. This will allow us to gain a fuller understanding of how the incoming somatosensory signals are interpreted and processed. Overall, we aim to explore how more naturalistic tactile interactions are encoded and how these can be translated to provide realistic prosthetic feedback.
NCT05213715
Cerebral Palsy (CP) is a non-progressive neurodevelopmental disorder characterized by posture and movement disorders as a result of damage to the immature brain for any reason before, during or after birth.In addition to tone, postural and neuromuscular control in children with Cerebral Palsy; Problems are also observed in communication skills, perceptual and cognitive systems and sensory systems.
NCT03446677
Persons with HIV can present vestibular system impairments, affecting postural stability. There is scarce literature related to the contribution of the visual and somatosensory systems in maintaining postural stability in persons with HIV. The purpose of this study is to describe the sensory systems used to maintain postural stability and how the sources of sensory information contributes to postural stability in asymptomatic persons with HIV. Postural stability was measured in 20 asymptomatic persons with HIV (11 male, 9 female, aged 43 ± 8 years). Static postural stability was evaluated during eight conditions that perturbed the visual, somatosensory and vestibular inputs. A paired-samples t-test was conducted to compare center of pressure (COP), antero-posterior displacement (APD) and right-left displacement (RLD) on stable and unstable surface and to characterize each balance sensory system. There was a significant difference in the COP and APD of eyes open condition compared to the remaining conditions on stable surface. Furthermore, there was a significant difference in the COP, APD and RLD for the eyes open on a foam surface compared to the remaining conditions on an unstable surface. Postural instability can be detected in asymptomatic persons with HIV under challenging conditions, previous to the evident appearance of balance impairments.
NCT03295890
Self paring study, double blind placebo controlled with chronic tinnitus patients attended at the Tinnitus Research Group HC- FMUSP, complaining of neck and/or cervical pain and with myofascial trigger point in the head, neck and/or shoulder. They were submitted to a complete otolaryngologist evaluation which included history, physical examination and myofascial trigger point checkup. Patients also performed blood tests, tonal and vocal audiometry, and psychoacoustic tinnitus measures. Self paring study, double blind placebo controlled. Each patient will be subjected to the dry needling placebo, 4 sessions, 1 per week, with placebo stretching, followed by washout period of two weeks, and 4 more dry needling therapeutic sessions and active stretching. On the first day of the study will be conducted the following evaluation: questionnaires THI and NDI, quantification of cervical pain and tinnitus through the Visual analogue scale (VAS), search and confirmation of the presence of PGM and cervical pain, psychoacoustic measures and somatic tests. This evaluation will be repeated at the end of the four placebo sessions, at the beginning of therapeutic needling sessions and at the end of the same.
NCT00316251
The purpose of this study is to determine the effects of Power Plate vibration therapy on balance as measured by the NeuroCom Balance Master.