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Diurnal variations of blood pressure in shift workers during day and night shifts (1989)

Baumgart, P. ; Walger, P. ; Fuchs, G. ; [et al.]

Springer

International archives of occupational and environmental health 61 (1989), S. 463-466

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ISSN: 1432-1246

Keywords: Shift work ; Night shift ; Blood pressure ; 24-h blood pressure monitoring ; Circadian rhythm

Source: Springer Online Journal Archives 1860-2000

Topics: Medicine

Notes: Summary The dependence of blood pressure upon internal rhythms and the short-term effects of shift rota on the blood pressure were investigated in shift workers. Blood pressure was measured every 30 min using automatic recorders for 24 h in 17 physically working men in a chemical factory during their morning and night shifts. Mean 24-h blood pressures were identical in the morning and night shifts. There were no differences of the mean blood pressure between the respective sleeping phases or between the working periods. The amplitudes of circadian blood pressure variations were equal. There was a phase difference of 8 h corresponding to the lag between the working periods. At this 8-h lag the hourly means of the 24-h blood pressure were closely correlated (r = 0.69). Comparisons of 24-h blood pressure profiles during the first and last days of a night shift week showed that the effects of night work on the blood pressure were already fully developed within the first 24h (r = 0.86). Thus the diurnal variations of the blood pressure are determined by the working and sleeping periods and largely independent of endogenous rhythm. There is no short-term alteration of the mean 24-h blood pressure after shift rota.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1007/BF00386480

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Dosiergenauigkeit bei der Stoffdosierung (1989)

Vetter, Gerhard

Weinheim : Wiley-Blackwell

Chemie Ingenieur Technik - CIT 61 (1989), S. 136-140

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ISSN: 0009-286X

Keywords: Chemistry ; Polymer and Materials Science

Source: Wiley InterScience Backfile Collection 1832-2000

Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology

Notes: Accuracy of dosage. Confusion sometimes surrounds the concept of dosage accuracy. For this reason, standard definitions and testing and calculation procedures are proposed for dosage accuracy, dosage error, and dosage constancy. Representation of the relationship between dosage error and dosage constancy within the area of tolerance of the dosage accuracy is new. Since the measurement of all error quantities is always bound to relate terms such as short-term, long-term, and momentary dosage error to a stated time base. This also facilitates a conceptually smooth transition to operating dosage errors observed in long-term operation. It would be convenient if some standardization of the concepts, and possibly a set of rules, could be developed on this basis. Evaluation of measured results on comparing guarantees would then be conducted in relation to the accuracy of measurement.

Additional Material: 13 Ill.