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Biomedical subjects

B Hüber

Publications and source records attributed to B Hüber.

16 recordsLinked to original sources
PubMed1994

Stability of cardiovascular responses across subjects and situations: a systematic approach.

This study describes the reproducibility of behaviorally elicited cardiovascular response patterns, 111 subjects were studied over a 1-year interval. Physiological variables recorded were heart rate, systolic and diastolic blood pressure, and respiratory rate. Test-retest stability coefficients were calculated and compared with the results of a study with a 3-day interval between test sessions. The physiological data are depicted in a four-dimensional data box (subjects, situations, replications, variables), and the variance components of the factors and their interactions are estimated. Some of the interaction components are associated with specificity principles and with temporal stability. To comprehensively describe special aspects of stability, measures for stability were generated (concerning subjects, situations, or both), adopting basic ideas from the covariance partitioning approach. The stability measures were compared with simple test-retest reliability coefficients and with generalizability coefficients, and systematic relationships between the stability measures are discussed.

Adolescent↗
PubMed1990

Stress-related changes of saliva cortisol in VDU operators.

In the field of work physiology, catecholamines and cortisol are used as strain indicators, because their production is increased in stressing work situations. Short-term stress cannot be ascertained by measuring catecholamines in urine. We studied the excretion of cortisol in saliva during short-term stress. We examined 77 healthy subjects who worked at a video display unit (VDU) for 30 min. They had to carry out a task with high speed and accuracy demands. Saliva specimens were taken before and after VDU work. Saliva cortisol levels were determined by means of a sensitive enzyme immunoassay (EIA). Additionally physiological parameters (heart rate, blood pressure, respiratory rate) and task performance were measured, and the subjects were asked about their feelings of stress and psychovegetative disorders. Saliva cortisol concentrations were significantly increased after 30 min of VDU work. Heart rate, blood pressure and respiratory rate were also increased during the task. In persons with high heart rate and blood pressure levels saliva cortisol increased significantly stronger during VDU work than in persons with lower heart rate and blood pressure levels. The results indicate that saliva cortisol is a useful strain indicator in short-term stress situations.

Adult↗
PubMed1990

[Task specificity and reproducibility of the psychophysiologic reaction pattern].

This paper presents results from investigations of physiological activation processes concerning two subjects. Firstly: Different tasks cause different reactions of the activation variables. In our experiment the heart rate raised stronger in the mental arithmetic task than in the trakking task. Conversely, blood pressure and respiratory frequency showed higher values in the tracking task. Secondly: By analyzing the stabilities for repeated investigations we obtained the following results: a) The reliability of the physiological strain variables is higher than that of the difference values. b) Habitual values are predicted best by the second investigation. c) If the experiment is often repeated, one can determine intraindividual correlations between activation variables for every single person.

Adult↗
PubMed1984

[Experiences with a mobile monitoring system for fetal and neonatal cardiotachometry].

A monitoring system for fetal and neonatal cardiotachometry which set up in own instrumentation at the Department of obstetrics of the Regional Hospital of Rostock. With aid of a wireless telemetric system is it possible to estimate the fetal condition before and during of caesarean section as well as at transfer of high risk neonates.

Cesarean Section↗
PubMed1977

[Behavior of physiological parameters and performance in a compensatory tracking task from the standpoint of aptitude judgements (author's transl)].

Activation behavior and performance were examined in twenty five subjects participated in a compensatory tracking task. The employed physiological parameters were useful for demonstration of interindividual differences in the activation behavior, personality characteristics are considered. Groups were formed according to the level of heart rate, arrhythmia, respiratory rate and level of performance. It was shown that exists a relation between activation level and performance. With regard to the relation between activation and performance may be derived psychophysiological aptitude judgements.

Adult↗