Estimating Heart Rate, Energy Expenditure, and Physical Performance With a Wrist Photoplethysmographic Device During Running.

Background: Wearable sensors enable long-term monitoring of health and wellbeing indicators. An objective evaluation of sensors' accuracy is important, especially for their use in health care.

Objective: The aim of this study was to use a wrist-worn optical heart rate (OHR) device to estimate heart rate (HR), energy expenditure (EE), and maximal oxygen intake capacity (VO) during running and to evaluate the accuracy of the estimated parameters (HR, EE, and VO) against golden reference methods.

Automated, percutaneous biopsy device.

An automated, percutaneous biopsy device was developed. A miniaturized motor in a 20-mL syringe produces low-speed rotation of the distal helical stylet for tissue acquisition. The device was used in vitro in 30 lesions, and the samples demonstrated adequate preservation of cell structure.

Slow potential changes in experimental neocortical propagated foci.

During and following interhemispheric stimulation (HS), characteristic negative slow potential changes (NSPCs) appeared which coincided with defined patterns of epileptic phasic field potentials (PFPs). Stimulus time-locked, high-amplitude, interhemispheric responses (IHRs), interictal and ictal patterns were accompanied by typical moderate NSPCs. In the wake of the latter, giant NSPCs occurred, concurrent with Van Harrevelds convulsions and/or either total or partial spreading, or local depressions.

Low impedance coaxial K+ selective microelectrodes.

A procedure for preparing coaxial K+ selective microelectrodes with a low longitudinal resistance (Re) of the liquid ion exchanger selective barrel is described. The low resistance was attained by inserting another microelectrode filled with 0.5 mol .