Search results for "Healthy subjects"
showing 10 items of 193 documents
Visual acuity and contrast sensitivity screening with a new iPad application
2016
We present a new iPad application (app) for a fast assessment of Visual Acuity (VA) and Contrast Sensitivity (CS) whose reliability and agreement was evaluated versus a commercial screening device (Optec 6500). The measurement of VA was programmed in the app in accordance with the Amblyopia Treatment Study protocol. The CS was measured with sinusoidal gratings of four different spatial frequencies: 3, 6, 12 and 18 cpd at the same contrast values of the Functional Acuity Contrast Test (FACT) included in the Optec 6500. Forty-five healthy subjects with monocular corrected visual acuities better than 0.2 logMAR participated in the agreement study. Bland-Altman analyses were performed to assess…
Cortical and subcortical visual event-related potentials to oddball stimuli in rabbits
2000
We applied repetitive transcranial magnetic stimulation (rTMS) in order to induce interference on visuo-spatial perception in 11 healthy subjects. Subjects performed a visuo-spatial task requiring judgements about the symmetry of prebisected lines. Visual stimuli consisted of symmetrically or asymmetrically transected lines, tachystoscopically presented for 50 ms on a computer-monitor. Performance was examined in basal condition and during rTMS trains of 10 stimuli at 25 Hz, delivered through a focal coil over right or left posterior parietal cortex (P5 and P6 sites) and triggered synchronously with visual stimulus. Randomly intermixed sham rTMS trains were employed to control for non-speci…
Respiratory snorkel and valve system for breath-by-breath gas analysis in swimming
2003
The present study aimed to compare a standard facemask (CM) and a newly modified swimming snorkel and valve system (SV) for breath-by-breath (BxB) gas analysis (K4 b2, Cosmed, Rome, Italy), and to validate the system under controlled laboratory conditions before being used in swimming. Nine healthy males performed two bouts of a stepwise exercise on an electrically braked stationary bicycle on separate days. Ventilatory and gas exchange parameters were analyzed using the same BxB portable system, with subjects breathing alternatively through the two different valves. Agreement between both methods was evaluated by Passing-Bablok regression analysis. The gas exchange values measured using th…
Study of different surfaces for neonates in hospital
2016
Evidence of risk of pressure ulcers in neonates pro is related to the type of bearing surface on which the neonate lays. To prevent pressure ulcers is necessary to know which of the available commercial surfaces is the most convenient. The goal of this work is to evaluate the interface and redistribution pressure of five constant low pressure devices (special surfaces for pressure management [SEMP] both static and mixed) for neonates. Next step will be the study of the properties of the new support surface with healthy subjects under clinical conditions.
Energy spectral density as valid parameter to compare postural control between subjects with nonspecific chronic low back pain vs healthy subjects : …
2021
Abstract Background Nonspecific chronic low back pain (NSCLBP) is one of the most common and frequent health problems. Objetive to compare postural control (i.e. center of pressure (CoP) displacement and energy spectral density (ESD)) using technological devices (accelerometers and pressure platform) between subjects with NSCLBP and healthy subjects. Methods A cross-sectional case-control study was conducted. Observational study (STROBE). The final sample consisted of 60 subjects (30 NSCLBP subjects and 30 healthy subjects). Triaxial accelerometer and pressure platform were used in order to obtain ESD and CoP displacement measurements during four balance tasks (i.e. with and without vision …
CHANGES IN THE TEAR PROTEIN PATTERNS OF DIABETIC PATIENTS USING TWO-DIMENSIONAL ELECTROPHORESIS.
2000
Four to five million Germans suffer from diabetes mellitus, and worldwide there are about 100 million people that suffer with the disease. In diabetic patients, dry eye and other ocular surface diseases occur more often than in healthy subjects. Very little is known about the alterations in tears caused by diabetes mellitus, or its influence on the pathogenesis of e.g., the dry eye disease. Recent studies from our group showed that there are differences in the one-dimensional electrophoretic tear protein separations between diabetic patients and healthy volunteers.1,2 The aim of this study is to analyze the tear protein patterns of patients suffering from diabetes (DIA) (Fig.l), and to comp…
Changes in the Tear Protein Patterns of Diabetic Patients Using Two-Dimensional Electrophoresis
2002
Four to five million Germans suffer from diabetes mellitus, and worldwide there are about 100 million people that suffer with the disease. In diabetic patients, dry eye and other ocular surface diseases occur more often than in healthy subjects. Very little is known about the alterations in tears caused by diabetes mellitus, or its influence on the pathogenesis of e.g., the dry eye disease. Recent studies from our group showed that there are differences in the one-dimensional electrophoretic tear protein separations between diabetic patients and healthy volunteers.1,2 The aim of this study is to analyze the tear protein patterns of patients suffering from diabetes (DIA) (Fig.l), and to comp…
Analysis of the Peripapillary and Macular Regions Using OCT Angiography in Patients with Schizophrenia and Bipolar Disorder
2021
Purpose: To measure RNFL and vasculature around the optic disc and in the macula in patients with schizophrenia (SZ) and bipolar disorder (BD) using optical coherence tomography angiography (OCTA). Methods: 24 eyes of patients with SZ and 16 eyes of patients with BD as well as 30 eyes of healthy subjects were examined with OCTA. The radiant peripapillary capillary (RPC) density and RNFL thickness were measured in the peripapillary area. Moreover, macular thickness and vessel density were measured in both superficial and deep layers. Results: Significantly decreased values of vessel density in the macular deep vascular complex were found in the eyes of patients with SZ, compared to BD and th…
Die Aktivität der Rückenstreckmuskulatur beim aufrechten Stehen und beim Sitzen mit standidentischer Rumpfhaltung - eine elektromyographische Studie
2001
Problem: There is a controversial discussion about the loading of the spine by the force of the extending muscles of the back in upright sitting with the back curved as in upright standing. Experimental studies investigating this issue are still lacking. Methods: In the study presented in this paper we measured in 30 subjects the activity of the extending back muscles both in a natural upright standing posture and in sitting with identical posture of the back as recommended in some back training programs. To this end we recorded the electromyographical surface activity of the back muscles at four levels of the spine in both postures. The EMG activities were intraindividually normalized with…
Functional Electrical Stimulation Alters the Postural Component of Locomotor Activity in Healthy Humans
2015
International audience; Knowledge of the effects of Functional Electrical Stimulation (FES) of different intensity on postural stability during walking in healthy subjects is necessary before these relationships in patients with postural disorders can be assessed and understood. We examined healthy subjects in Control group walking on a treadmill for 40 min and in FES group provided with 30 min of stimulation, which intensity increased every 10 min. The main difference between Control and FES group was the progressive increase of trunk oscillations in sagittal, frontal, and horizontal planes and an increase of relative stance duration in parallel with FES intensity increase. Both Control an…