[Research on the adaptation mechanism to work and effects of stress factors in truck drivers].
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Adaptation, Ocular↗
Biomedical subjects
R Vrîncianu
Publications and source records attributed to R Vrîncianu.
EEG automatic processing method.
This is a description of researches carried out in man and experimentally in rats. The results - obtained in 44 children aged between 12 and 14 yr. - of the electric signal processed as a F/A ratio were compared to the transport mechanisms of the blood sodium. We found that the normal brain excitability level was consistent only with the blood sodium transport through interaction with the proteins. The lack of such interaction was accompanied by an increased excitability on eeg recordings and by behaviour disturbances. The researches carried out in rats had in view the brain excitability level in two groups of animals aged 6-8 months, which drank from their birth either physiological salt (group 1) or distilled water (group 2). In this species, in spite of direct visible modifications in eeg recordings by sensorial stimulation, the processing as F/A ratio did not show any differences, and this made necessary the use of computers to process rightly the data; the respective digitization and memorising methods are described, too.
Adolescent↗
Systolic time intervals in passive head down position (-85 degrees) and exercise.
Variations of cardiac time intervals (CTI) in head-down (HD) condition and during an 120 watts bicycle exercise were investigated by the method of ear densitogram associated with an automatic system of evaluation of systolic time intervals (STI), in young subjects, aged 25-30 years. In the HD experiment unchanged heart rate (HR) and left ventricular ejection time (LVET) values were increased, whereas pre-ejection time (PEP) values decreased. Exercise increased HR and decreased PEP and LVET values. Two different mechanisms are involved in the decrease of PEP in the two circumstances, by increasing the end diastolic volume and, respectively, by a sympatho-adrenergic reaction.
Adult↗