1,721,009 research outputs found
A Low-Cost Real Time ECG/BIA Monitoring System Based on Versatile miniASIC Sensor Interface
No full textA novel real-time compact system for ECG and bioimpedance acquisition without complex signal processing algorithms is presented. The device combines a recently developed versatile miniASIC with commercial low-cost Ag/AgCl ECG electrodes. The miniASIC is a custom high-programmable low-power electronic interface for different sensor types. Experimental tests were conducted on a prototype to assess its capability of measuring and preprocessing biomedical signals. The performances of the proposed system were validated with commercial device as benchmark. Experimental results demonstrate that the proposed system is suitable for the implementation of low-cost, portable biomedical devices for healthcare applications
Reliability of a driving simulation task for evaluation of sleepiness.
No full textDriving Simulators reproduce situations which require both tracking and visual searching, the main features of real driving. This study measured the reliability of a monotonous driving scenario to detect the circadian variations of alertness in healthy subjects.
Five men and five women underwent a monotonous 30-minute driving simulation task every two hours. Before each driving task subjects completed the Stanford Sleepiness Scale (SSS) and the Visual Analogue Scale (VAS) to correlate the subjective measurements of sleepiness to the objective data of the simulator. Driving performances deteriorated or improved according to the circadian variation of alertness.
The scenario is suitable to detect the consequences of sleepiness related to the circadian variations of alertness. The parameter most significant for evaluation of sleepiness is the standard deviation of lane position, mainly comparing the differences among the 10-minute blocks in each task
Relationship betweeen MSLT-MWT and driving simulator performances in OSAS patients . Sleep 2006, 29 suppl A342 20th Meeting of APSS Salt Lake City 17-22 june 2006
No full textMulti-Modal Respiratory Monitoring Using SENSIPLUS Chip Bioimpedance Measurements and Acoustic Sensors
No full textContinuous respiratory monitoring is essential for the early detection and management of respiratory diseases such as chronic obstructive pulmonary disease (COPD), asthma, and sleep apnea. Traditional methods, including spirometry and polysomnography, remain the gold standard but present limitations such as high costs, invasiveness, and the requirement for trained personnel. This study proposes a multi-modal respiratory monitoring system integrating bioimpedance (BIOZ) and acoustic sensing for non-invasive, continuous, and real-time respiratory assessment. The system uses the SENSIPLUS microchip (developed by Sensichips s.r.l.) for bioimpedance measurements and a MEMS (Micro Electro-Mechanical System) microphone for capturing respiration sounds. The experimental validation was conducted by comparing these methods with a spirometer as the reference standard. Results demonstrated a strong correlation between the BIOZ and the acoustic-derived signals with spirometric data. The Root Mean Square Error (RMSE) values with respect to a gold standard, for inspiration and expiration using bioimpedance were 0.174 s and 0.190 s, respectively, while the acoustic-based approach yielded RMSE values of 0.4136 s for inspiration and 0.2217 s for expiration. These findings highlight the feasibility of integrating bioimpedance and acoustic sensing for accurate and wearable respiratory monitoring, offering potential applications in telemedicine, personalized healthcare, remote patient monitoring, early disease detection, and smart healthcare solution
A driving simulation task: correlations with Multiple Sleep Latency Test.
No full textSleepiness and driving are a dangerous combination that causes thousands of crashes each year resulting in injury and death. In the last few years, driving simulators have been used to study the performance decrements associated with drowsiness.
We correlated performances of a driving simulation task in healthy volunteers in different alertness conditions with objective (MSLT) and subjective (Stanford Sleepiness Scale and Visual Analogue Scale) sleepiness measurements.
The subjects were tested on two days, after a normal night of sleep and after a night of complete sleep deprivation. The study consists of four sessions of MSLT, each one followed by subjective measurements of sleepiness and by a 30 minute driving simulation task with a monotonous driving scenario.
The parameters that correlate most highly with MSLT are the SD of lane position, the mean RT, crash frequency and exceeding the speed limit frequency.
The monotonous driving simulation we adopted showed strong correlations with MSLT and subjective sleepiness scales in healthy subjects and is suitable to evaluate excessive daytime sleepiness in patients.
Key words: , , Subjective Sleepiness Measurements, Driving Performance, Sleep Deprivation, Drowsiness
Simulated driving performance coupled with driver behaviour can predict the risk of sleepiness-related car accidents.
No full textA Miniaturized ECG System Based on a Versatile Single Chip Sensor Interface
No full textCommercial low-cost ECG electrodes and custom integrated electronic circuits can be combined to build a compact system capable of performing both the EGC and bioimpedance measurements. This paper presents a compact solution for ECG and bioimpedance acquisitions relying on a recently introduced versatile low-power mixed-signal sensor interface, without using complex algorithm of acquisition and signal processing. Experimental test were conducted on a prototype to evaluate the capability of measuring biomedical signals
A PVT-Robust Beta-Multiplier Current Reference with Body-Effect-Based Temperature Dependency Modulation
No full textAs of today, designing Current References (CRs) with enhanced PVT-robustness is still hardly straightforward, especially under area occupation constraints. In this work, we present a novel beta-multiplier CR, performing first-order temperature compensation without the need of separate positive and negative Temperature Coefficient (TC) current generators. At the design stage, the reference current temperature dependency can be tuned by acting on the area distribution among matched transistors with asymmetrical body effects. Electrical simulations of a 949-nA 0.18-μm CMOS design show TC, line sensitivity and relative standard deviation values equal to 258 ppm/°C, 4.59%/V and 1.24%, respectively, with a 0.033 mm2 layout. Such findings validate the proposed approach as a reliable temperature compensation strategy, comparable with the state of the art
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