2000 Fiscal Year Final Research Report Summary
The evaluation of tolerance to shiftwork and effects of nighttime nap on psycho-physiological function between morningness and eveningness subjects
| Project/Area Number |
11470110
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| Research Category |
Grant-in-Aid for Scientific Research (B).
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Public health/Health science
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| Research Institution | Nagoya City University |
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Principal Investigator |
ITANI Toru Nagoya City University Medical School, Department of hygiene and Occupational Health, Professor, 医学部, 教授 (00072661)
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| Co-Investigator(Kenkyū-buntansha) |
SAKAMURA Osamu Nagoya City University Medical School, Research Associate, 医学部, 助手 (80264711)
TACHI Norihide Nagoya City University Medical School, Assistant Professor, 医学部, 助教授 (10137119)
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| Project Period (FY) |
1999 – 2000
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| Keywords | tolerance / nightwork / morningness / eveningness / nap |
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| Research Abstract |
To examine the tolerance to night work and effects of nighttime nap on psycho-physiological functions between morningness (M-types) and eveningness (E-types) subjects, we carried out experimental studies under the simulated schedule. Eight moderate eveningness and 5 moderate morningness subjects participated in this study. Experimental periods were simulated shift schedule of consecutive 9 days consist of 2 day duty (work 8 : 00-16 : 00), 3 night duty (work 22 : 00-8 : 00) and 3 day duty. They carried out the experiments schedule twice, That is, subjects take a nap or without a nap for 2 h (from 2 : 00 to 4 : 00) every night. Subjects conducted measuring oral temperature, collecting saliva, filling out question sheets, and other inspections such as critical flicker fusion frequency and 3-choise reaction time during break between each tasks. Heart rate variability was recorded throughout studies to evaluate autonomic nerve activities. In M-types, the fall of task performances and increasing subjective feeling of fatigue during night duty without nap condition were significantly suppressed by the nap on the first night duty. Moreover, HF value between 4 : 00 and 6 : 00 significantly decreaed by nap in M-types. These results suggested that nighttime nap in M-types are thought to be more effective than that in E-types.
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