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Biomedical subjects

C Bensch

Publications and source records attributed to C Bensch.

At least 19 recordsLinked to original sources
PubMed2002

Heart rate variations in five-month-old children during interactions in a controlled environment.

UNLABELLED: This paper reports the first data of a study on heart rate variations of 13 5-mo-old infants seated in special chairs. Their electrocardiograms and behaviour were continuously recorded during sessions that were set up with their mother and a mother-child dyad that they met for the first time when the first session was organized. The protocol comprised two interaction phases between the infants and their mothers and two with one another. The same pairs of mother-child dyads were studied a second time 1 wk later. During the first session, the infants' heart rate variability increased significantly from the mother-infant interaction phases to the infant-infant interaction phases. During the second session, the variability was higher during the mother-infant phases than in the corresponding phases of the first session. This could be linked to changes in the mothers' behaviour and the infants' idea and excitement of meeting the child from the first session again. However, the variability was significantly lower during the infant-infant phases than during the mother-infant phases and the corresponding infant-infant phases of the first session. This corresponds to the development of affiliative behaviours in the infants. CONCLUSION: When two 5-mo-old infants were seated by their mothers in special chairs, significant differences were observed in their heart rate variability when they became familiar with each other, whether they were interacting with their mothers or with one another.

Analysis of Variance↗
PubMed1997

Psychophysiological and clinical value of event-related potentials in obsessive-compulsive disorder.

To investigate brain correlates of cognitive function in obsessive-compulsive disorder (OCD), event-related potentials (ERPs) were recorded in a group of thirteen unmedicated OCD patients and thirteen normal controls for verbal auditory stimuli in an oddball paradigm. The patients showed longer latencies of the N1 and P2, shorter latency of the P3, and reduced amplitude of the N2. These results suggest that OCDs stress the speed of task-dependent processes (i.e., by showing shorter N2 and P3 latencies) and have impairment of task-independent ones (i.e., by showing longer N1 and P2 latencies and reduced N2 amplitude). The components were more positive in the left hemisphere in OCDs and in the right hemisphere in normal controls. Future responders to treatment had significantly reduced N2 and enhanced P3 amplitudes relative to future nonresponders. So ERPs might provide psychophysiological profiles in OCDs with clinical and pharmacological implications.

Adult↗
PubMed1995

Blood lactate levels of decathletes during competition.

There are many detailed physiological profiles of athletes who participate in a wide variety of sporting activities but few data have been obtained on decathletes. This study defines some physiological characteristics of these athletes and measures capillary lactate concentrations [La(b)] during a laboratory test of progressive maximal exhaustion and the different events during competition. The treadmill test is similar to the 100 m, 400 m and 1500 m in terms of [La(b)] accumulation but only similar to the 1500 m in terms of velocity. The 400 m is the most demanding event with the greatest blood lactate accumulation (mean(s.d.) 16.38(2.36) mmol l-1). The [La(b)] at the end of the 110 m hurdles is significantly lower than in any other racing events (mean(s.d.) 6.96(1.32) mmol l-1) compared with mean(s.d.) 12.14(2.87) and mean(s.d.) 11.44(2.16) for the 100 m and 1500 m respectively. The [La(b)] after the long jump, the high jump and the pole vault are not significantly different (mean(s.d.) 5.30(2.23), 4.64(1.39) and 5.36(1.34) mmol l-1) respectively).

Adolescent↗
PubMed1993

[Electrophysiological development under thalamic stimulation of post-traumatic persistent vegetative states. Apropos of 25 cases].

We have studied the electrophysiological evolution, with the aid of long-term, quantitative E.E.G. (Holter method) and sensory evoked potentials (visual, auditory and somatosensory) on 25 severe traumatic head injury patients (initial Glasgow scale--between 3 and 5) aged from 5 to 42 years having evolved towards a persistent vegetative state and being object of a protocol of thalamic stimulation. Electrophysiological exploration was practised before placement of the stimulation, then at 2 weeks, 1 month, 2 months and finally 3 months after. The electrophysiological parameters appear to have no predictive value on the clinical evolution after stimulation. However, changes such as long-term quantitative EEG as well as evoked potentials mostly precede clinical progress when present. Cortical evoked potentials are the first to change significantly (J15) followed by long-term quantitative EEG and brain stem evoked potentials (J30); the latter improving more completely. Also the consideration of the chronobiological aspects of the recordings of the long term EEG allow the proposal of "waking targeted" stimulations at the most favorable moments of the nyctohemeral period.

Adolescent↗
PubMed1984

Immunohistochemical localization of dopamine in the brain of the insect Locusta migratoria migratorioides in comparison with the catecholamine distribution determined by the histofluorescence technique.

As part of a follow-up study to our previous investigation of the catecholaminergic neurosecretory cells in the brain of adult female locusts (Locusta migratoria migratorioides) by means of the formaldehyde-induced fluorescence method, we have attempted to specify the identity of the amines present in these cells by an immunohistological technique. Using a recently developed anti-dopamine serum, we have demonstrated that the majority of the catecholaminergic median neurosecretory cells contain dopamine. Moreover, dopamine is present in some cell bodies of other zones of the brain, i.e. the median subocellar neurosecretory cells, perikarya in external areas of the protocerebrum, below the calyces, around the pedunculus, in the optic lobes (between the lobula and the medulla, between the medulla and the lamina), and in external zones of the tritocerebrum. Among the structured neuropils, which were particularly fluorescent in the formaldehyde-induced fluorescence method, only the pedunculus, the posterior part of the central body, the external zones of the alpha- and beta lobes and the proximal part of the lamina contain little dopamine.

Animals↗
PubMed1981

[Histochemical fluorescence study of aminergic cells throughout the central nervous system of the migratory locust (author's transl)].

We have investigated the aminergic neurosecretory cells in the brain and the ganglia of the ventral nerve cord of the adult female locust, by means of the Falck and Hillarp method, with or without a block of the degradation of amines by nialamide. In the brain, we have confirmed the presence of catecholamines and probably indolamines-containing cells and defined their positions in the protocerebrum and the lateral zones of the deutocerebrum and the tritocerebrum. In the ventral cord, we have found groups of catecholaminergic cell bodies in suboesophageal, thoracic and abdominal ganglia, and probably indolaminergic cell bodies in thoracic and some abdominal ganglia. Aminergic fibres are present in all the ventral cord. They are especially numerous in suboesophageal and thoracic ganglia. In these ganglia, some fibres enter the roots of some somatic nerves.

Animals↗
PubMed1975

Catecholamine histofluorescence in the median eminence of female rabbits activated by mating.

Mating was used in the rabbit as a physiological trigger, easily definable in time, for the activation of gonadotropic hypothalamic structures. Using the histochemical fluorescence technique of Falck and Hillarp, it has been attempted to determine whether, in relation to mating, clearly distinuishable and reproducible changes in histofluorescence occur in the tuberoinfundibular dopaminergic system in combination with hypothalamic hypophysiotropic hormone release. Between 20-30 min post-coitum an increase in DA turnover was noted in the external layer of the median eminence. The characteristics of this reaction were studied by administration of reserpine and alpha-methyl-paratyrosine. Immediately after coitus, a paradoxical fluorescence reactivation was observed in the median eminence in female rabbits in which tyrosine-hydroxylase activity was inhibited for 5 hours.

Animals↗