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An instrumented bicycle pedal was built and calibrated. The pedal has good linearity and sensibility, comparable to other instruments in the literature. This study aimed to perform accurate calibration of a tri-axial pedal, including forces applied, deformations, nonlinearities, hysteresis and standard error for each axis. Calibration was based on Hull and Davis method, which is based on the application...
Preservation of astronaut crew health during an exploration mission to the Moon or Mars will be crucial to mission success. The likelyhood of a life threatening medical condition occurring during a mission to Mars has been estimated by NASA to be 1% per year. Since basic life support is a vital skill in critical care medicine, plans must be in place for cardiopulmonary resuscitation in both microgravity...
This paper describes a new technique to compensate the eye movements in dark adaptometry tests. The instrument is controlled by a personal computer and can be used in the investigation of several retinal diseases. The stimulus is delivered to the eye through the modified optics of a fundus camera using two light-channels: one for the stimulus presentation, and other for retinal visualization. Infrared...
This article presents a software program for visualization and processing of medical images. It provides an expansible set of techniques to help extracting visual information from medical images to be used in diagnosis support and in advanced scientific investigations
An equipment to support the medical diagnosis and the studies of human balance in real time is being developed. This equipment is based on a recent technique which quantifies the movement of the eyes based on digital image processing. During the development of the equipment, modifications to the original algorithm were applied to improve its performance, since a faster camera is being used. The purpose...
This research purposes the development of a telemedicine system capable of remote monitoring and digitalization the patients biological signals. It includes a mobile device which transmits the patient electroencephalogram (EEG) and electrocardiogram (ECG) to a monitoring host using the wireless communication, allowing mobility to the patient in hospital or in his daily routine
This study aimed to develop a Walking Pattern Evaluation System during Hypogravity Simulation (SAMSH), which included the adaptation of a body suspension device, the instrumentation of a treadmill and the development of a virtual environment. SAMSH was developed using one subject. Kinematic analyses were performed whilst one individual was walking on the treadmill during body weight reduction simulating...
A headward fluid shift occurs in microgravity due to the absence of hydrostatic gradients. Different countermeasures have been proposed to decrease related cardiovascular symptoms, like the application of lower body negative pressure (LBNP) in-flight. We have developed an LBNP box with an environmental control system. It aims at improving features of LBNP boxes currently used worldwide.The LBNP box...
A headward fluid shift occurs during microgravity exposure, which causes the cardiovascular adaptive syndrome. Different countermeasures have been proposed to decrease its symptomatology, like the application of lower body negative pressure (LBNP). A LBNP box with an environment control system was developed, aiming to improve features of LBNP boxes used worldwide. It consists of five carbon steel...
The clinostat was originally used to find out why plant roots appear to grow predominantly toward the center of the Earth. Over the last 2-3 decades, slow- and fast-rotating 2D and 3D clinostats have been used to assess cellular adaptation to this environment. A cell culture is placed in a spin module of the clinostat platform and its rotation is set empirically (2-3 rpm). The machine is then allowed...
This paper describes an algorithm used to automatically determine the threshold sensitivity in a new dark adaptometer. The new instrument is controlled by a personal computer and can be used in the investigation of several retinal diseases. The stimulus field is delivered to the eye through the modified optics of a fundus camera. An automated light stimulus source was developed to operate together...
Educational and outreach programs in space sciences have been a major concern since the beginning of the Space Era. Education curricula in Brazil rarely consider topics related to manned and unmanned space flight. This lack in the Brazilian education system has motivated the development of educational tools, used to demonstrate the effects of hyper- and microgravity on test bodies, both gravitational...
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