Biomedical subjects

F Lille

Publications and source records attributed to F Lille.

At least 37 records · Page 2Linked to original sources

PubMed1981

Relationship between heart rate and sinus arrhythmia in air traffic controllers at work.

Sinus arrhythmia and mean heart rate were calculated from continuous electrocardiogram recordings of ten air traffic controllers. The telemetric recordings were carried out during 1 day of work and the following day's night shift. The individual variations of sinus arrhythmia were very large. The different situations (rest, relaxed work, intense work, eating, movements within the control room) had no specific effect on sinus arrhythmia. For each subject and for each group it was the value of the mean heart rate and its temporal variations that had the greatest influence on variations of sinus arrhythmia.

Adult↗

PubMed1980

[Health effects of night work].

Schedules of working times are related to various individual problems including the family, the quality of home and health problems. Only epidemiological studies can reveal the complexity of problems related to shift work. Night shifts ae increasing constantly and must be considered as a physiological, medical and social load of the worker.

Adult↗

PubMed1979

Effect of ageing and occupational activity on active wakefulness.

44 people were recorded by a telemetric system during 8 h of daily occupational activity. 24 were factory personnel (12: mean age 37 years, and 12: mean age 53 years) and 20 were univeristy researchers (10: mean age 39 years, and 10: mean age 53 years). Recordings were made concerning EEG, EOG, EMG, and EKG. At 35 years no differences were observed. At 50 years the organization of wakefulness was different for the two occupational activity groups. Although stable for the moment seemed to play a prominent role in the modulation of wakefulness.

Adult↗

PubMed1978

Spontaneous variations in level of arousal among aged individuals. Correlations with functional abilities and mental performances.

The aim of this study was to assess whether spontaneous interindividual variations in arousal level appreciated by telemetric recordings of physiological variables were related to mental performance and functional ability in institutionalized aged subjects. The sample studied was made up of 18 subjects (16 women and 2 men) aged 82-97, living in an old age home in Paris. Telemetric recordings of EEG, EKG, EMG and EOG were obtained over 8-hour periods, during the subjects' normal daily activity schedule. The Stockton Geriatric Rating Scale (SGRS), Benton's Visual Retention Test (VRT) and the Trail Making Test (TMT) were independently used to assess behaviour and mental performance of these aged persons. All correlations between telemetric data and psychological evaluations (the psychometric tests as well as the rating scale) were highly significant, even once the influence of the cultural level was controlled.

Activities of Daily Living↗

PubMed1975

Effects of time and tasks upon auditory and somatosensory evoked potentials in man.

Auditory evoked potentials (AEPs) recorded from the vertex and somatosensory evoked potentials (SEPs) recorded from the somatosensory and motor areas and vertex were examined during visual and auditory discrimination tasks, with and without motor responses, and during motor tasks alone in normal human subjects. These procedures allowed the separation of sensory discrimination from motor activity effects on the evoked potentials. It was observed that EPs were modified systematically by task and by temporal variables, even though vigilance, as evaluated through EEG recording and performance level, was stable throughout the experimental recording session. 1. AEPs were minimally influenced by time, but very sensitive to task. Inversely, the SEP amplitude decreased considerably with time and less with task. There was evidence of time/task interaction. 2. The magnitude of SEP attenuation in time was reduced by intervening rest periods. 3. The sensory modality in which the discrimination task was performed did not influence the effect on EPs. A discrimination task involving a motor response reduced EPs more than a pure discrimination or a pure motor task. The task effect seems to involve a general, mechanism (load imposed upon the subject) not dependent on the particular sensory channel used to deliver task-relevant information.

Auditory Cortex↗

PubMed1975

Effect of voluntary self-paced movements upon auditory and somatosensory evoked potentials in man.

The effect of voluntary self-paced movements upon auditory (AEPs) and somatosensory (SEPs) evoked potentials has been investigated according to the temporal relationship between movement and delivery of test stimuli. EPs were recorded in 7 subjects and averaged in 10 successive epochs extending from 880 msec before to 2500 msec after movement. AEPs were attenuated in all epochs. The decrease was greatest in the 220 msec epoch just following movement and involved components N85 and P170. SEPs were attenuated similarly to AEPs when movements were performed by the hand contralateral to somatosensory stimulation. Of the 5 SEP components, only P40 failed to reflect the attenuation, while P95 showed the greatest amplitude decrease. When stimulation was ipsilateral, SEP amplitude was attenuated only when close to the movement. N65 and P95 decreased while N130 increased. In all subjects the results were consistent for treatments of AEP and SEP (with contralateral movements), whereas large inter-individual differences were observed for the SEP with ipsilateral movements.

Auditory Cortex↗

PubMed1972