Sleepiness, alertness and performance during a laboratory simulation of an acute shift of the wake-sleep cycle
Article Abstract:
A study was undertaken to investigate time of day effects on sleepiness, task performance and vigilance using laboratory stimulation of an acute change in the wake-sleep cycle. It was believed that inadequate daily sleep and increased sleepiness on the job are two of the most common problems encountered by people involved in shiftwork. Results revealed that wakefulness and ability to conduct visuo-attentive tasks were significantly spared during night time while sleep latency and performance of complex and monotonous tasks increased sleepiness and decreased performance.
Publication Name: Ergonomics
Subject: Business
ISSN: 0014-0139
Year: 1998
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Effects of 10 h time zone changes on female flight attendants' circadian rythms of body temperature, alertness and visual search
Article Abstract:
The effects of swift time-zone changes on stewardesses' biological clock were studied. Temperature readings indicate that biological rhythms of flight attendants were in a de- and resynchronization conduct for almost nine days on the average. Menstrual cycle was extended because of stress factors which defer ovulation. Eighty percent of the subjects slept anaverage of one to two hours on return flights, which is not enough to uphold alertness. Five days is the allotted recovery time to renormalize alertness, visual acuity and body temperature.
Publication Name: Ergonomics
Subject: Business
ISSN: 0014-0139
Year: 1993
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The prediction of the adaptation of circadian rhythms to rapid time zone changes
Article Abstract:
The role of different external and internal factors in the resynchronization speeds of salivary melatonin and alertness rhythms after transmeridian flights over ten time zonesis investigated. Results show that the amount of daylight, age, personality, marital status and physical exercise predict the circadian rhythm adaptation after transmeridian eastward and westward flights.
Publication Name: Ergonomics
Subject: Business
ISSN: 0014-0139
Year: 1993
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