Biomedical subjects

R G Barnes

Publications and source records attributed to R G Barnes.

3 recordsLinked to original sources

PubMed1998

Shift type and season affect adaptation of the 6-sulphatoxymelatonin rhythm in offshore oil rig workers.

Previously we have shown that the 6-sulphatoxymelatonin rhythm of oil rig workers on a 2-week night shift (1800-0600 h) adapts to the shift via a phase delay. We now report the findings of a study on two offshore drill crews working a 1 week day (1200-0000 h), 1 week night (0000-1200 h) swing shift. Urine samples were collected every 2-3 h throughout the subjective days, with over-sleep collections, for the measurement of 6-sulphatoxymelatonin by radioimmunoassay. One crew (n = 11), studied in November, showed no change in their 6-sulphatoxymelatonin rhythm during night shift. The other crew (n = 7), studied in March, showed a significant phase advance of the rhythm during night shift. The data indicate that both the type of shift and the season influence the direction and degree of adaptation.

Adult↗

PubMed1998

Adaptation of the 6-sulphatoxymelatonin rhythm in shiftworkers on offshore oil installations during a 2-week 12-h night shift.

The circadian rhythms of most shiftworkers do not adapt to night shift. We have studied oil workers on a rotating system involving 2 weeks day shift (0600-1800 h) and 2 weeks night shift (1800-0600 h) throughout a day and night shift sequence. Urine samples were collected 3-hourly whilst awake, with an over-sleep collection, for the measurement of 6-sulphatoxymelatonin by radioimmunoassay. In three separate groups results showed adaptation by delay of the 6-sulphatoxymelatonin rhythm in the first week of night shift. The rates of phase shift (mean +/- SEM) were 1.51 +/- 0.16 h/day (n = 5), 1.32 +/- 0.41 h/day (n = 5) and 1.77 +/- 0.31 h/day (n = 17). Specific environmental and social factors together with the shift schedule on oil rigs may facilitate adaptation to a 12 h night shift within a week.

Adaptation, Physiological↗

PubMed1987

Test anxiety in master's students: a comparative study.

Evaluation events are major problems for graduate students in nursing. The purpose of this study was to determine the correlation of test anxiety before and cognitive interferences during a comprehensive examination. The sample (N = 54) consisted of two groups of students (Group I, N = 30 and Group II, N = 24) in a master's program at a state university. Data were collected using three questionnaires: To measure general test anxiety, the Test Anxiety Questionnaire (TAQ) by Sarason was used; the Pre-Examination Questionnaire (PEQ) by Morris, Davis, and Hutchings (1981) was used to measure pretest anxiety; and to identify cognitive interferences during the examination, the Cognitive Interference Questionnaire (CIQ) by Sarason and Stoops (1976) was used. Findings revealed positive correlations between the two groups of students' general test anxiety and their cognitive interferences about evaluative outcome of the examination. Positive correlations were found also between the two groups' general test anxiety and their pretest anxiety immediately prior to writing the examination. No significant relationships were found between the student's performance rankings on the examination and their test anxiety.

Adult↗