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Featured researches published by Norihide Tachi.


Chronobiology International | 2010

HOW DO THE TIMING AND LENGTH OF A NIGHT-SHIFT NAP AFFECT SLEEP INERTIA?

Tomohide Kubo; Masaya Takahashi; Hidemaro Takeyama; Shun Matsumoto; Takeshi Ebara; Kensaburo Murata; Norihide Tachi; Toru Itani

Napping is one strategy that may assist night shiftworkers to cope with sleepiness and fatigue. However, one potential disadvantage of napping is that awakening from naps is disturbed by sleep inertia, which has also been found to impair performance and/or mood, transiently. The authors examined the effects of the timing and length of a night-shift nap on sleep inertia in a laboratory setting. Twelve male university students (mean ± SD: 21.6 ± 2.8 yrs) participated in this 3-day experiment, during which included a simulated night shift (22:00–08:00 h) and subsequent day (11:30–17:30 h) and night sleep (00:00–07:00 h). The simulated night shift was designed to include one of five (four nap/one no-nap) conditions. The napping conditions differed by their timing and duration: 00:00–01:00 h (Early 60 min; E60), 00:00–02:00 h (Early 120 min; E120), 04:00–05:00 h (Late 60 min; L60), 04:00–06:00 h (Late 120 min; L120). Participants completed all the experimental conditions in a counterbalanced order. Rectal temperature (RT) was recorded throughout the simulated shift and polysomnography (PSG) was recorded during the nap period. Immediately before and after each nap, participants were required to complete a visual analogue scale (VAS) to assess sleepiness and a visual vigilance test (VVT). During the simulated night shift, a set of tasks (an English transcription task, a performance test battery, and a break) was repeated hourly, except during the periods of napping. For each nap condition, the VAS and VVT (reaction time [RT]; lapses >5 s) results were analyzed by two-way, repeated-measures analysis of variance (ANOVA) (nap [nap versus no-nap] × time point [pre-nap versus post-nap]). PSG and RT data were analyzed with one-way repeated-measures ANOVA. Marginally significant interactions were observed for RTs and lapses in VVT for the L60 nap condition (p = .071 and p = .070, respectively). However, those effect sizes were moderate (partial η2 = 0.266, 0.268, respectively). Post hoc analyses showed significantly longer RTs (p < .05) and more lapses (p < .05) following the L60 nap compared with no nap. In contrast, there was no significant difference in sleepiness between the L60, or any of the other nap conditions, and the no-nap condition. Our findings suggest the effect of sleep inertia on VVT performance was profound in the L60 condition, although no significant effects on sleepiness were self-reported by VAS. The dissociation between performance and sleepiness might reflect an unstable state where participants cannot perceive decline in their performance. The present findings are significant in terms of occupational safety; the practical implication is that great care is needed when taking a 1-h nap between 04:00 and 05:00 h on the night shift. (Author correspondence: [email protected])


Journal of Occupational Health | 2009

Effects of a Modified Ambulance Night Shift System on Fatigue and Physiological Function among Ambulance Paramedics

Hidemaro Takeyama; Toru Itani; Norihide Tachi; Osamu Sakamura; Kensaburo Murata; Tatsuki Inoue; Toshimasa Takanishi; Hatsuko Suzumura; Sayuri Niwa

Effects of a Modified Ambulance Night Shift System on Fatigue and Physiological Function among Ambulance Paramedics: Hidemaro Takeyama, et al. Faculty of Human Wellness, Department of Registered Dietitians, Tokaigakuen University


Journal of Occupational Health | 2010

Interactive Model of Subsidiary Behaviors, Work Performance and Autonomic Nerve Activity during Visual Display Terminal Work

Toshimasa Takanishi; Takeshi Ebara; Gen-i Murasaki; Tomohide Kubo; Norihide Tachi; Toru Itani; Michihiro Kamijima

Interactive Model of Subsidiary Behaviors, Work Performance and Autonomic Nerve Activity during Visual Display Terminal Work: Toshimasa Takanishi, et al. Department of Occupational and Environmental Health, Nagoya City University Graduate School of Medical Sciences


Industrial Health | 2008

Effects of adjustable sit-stand VDT workstations on workers' musculoskeletal discomfort, alertness and performance

Takeshi Ebara; Tomohide Kubo; Tatsuki Inoue; Gen-i Murasaki; Hidemaro Takeyama; Tomoaki Sato; Hatsuko Suzumura; Sayuri Niwa; Toshimasa Takanishi; Norihide Tachi; Toru Itani


Industrial Health | 2009

Characterizing recovery of sleep after four successive night shifts.

Tomohide Kubo; Masaya Takahashi; Norihide Tachi; Hidemaro Takeyama; Takeshi Ebara; Tatsuki Inoue; Toshimasa Takanishi; Gen-i Murasaki; Toru Itani


Industrial Health | 2010

Brief hourly exercise during night work can help maintain workers' performance

Tomoaki Sato; Tomohide Kubo; Takeshi Ebara; Hidemaro Takeyama; Tatsuki Inoue; Megumi Iwanishi; Norihide Tachi; Toru Itani; Michihiro Kamijima


The Japanese Journal of Ergonomics | 2007

A field study on relation between work condition and physical workload during refuse collecting

Toshimasa Takanishi; Tomoaki Sato; Kensaburo Murata; Tatsuki Inoue; Tomohide Kubo; Takeshi Ebara; Hidemaro Takeyama; Norihide Tachi; Toru Itani


Proceedings of the Annual Meeting of Japan Ergonomics Society | 2012

A Survey of Relief from Physical Restraint in General Hospitals

Akiko Yamahata; Kayo Haruta; Mayumi Ito; Norihide Tachi; Takeshi Ebara; Tomohide Kubo; Hatsuko Suzumura


The Japanese Journal of Ergonomics | 2008

Analysis of cause-effect relationship between subsidiary behaviors, work performance and human errors by cross-correlation analysis

Takeshi Ebara; Toshimasa Takanishi; Tomohide Kubo; Tomoaki Sato; Tadashi Oikawa; Tatsuki Inoue; Hatsuko Suzumura; Hidemaro Takeyama; Sayuri Niwa; Norihide Tachi


The Japanese Journal of Ergonomics | 2008

Reliability and validity of the patient safety climate scale

Takeshi Ebara; Tomohide Kubo; Tomoaki Sato; Kunio Tsurumi; Hatsuko Suzumura; Hidemaro Takeyama; Norihide Tachi

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Toru Itani

Nagoya City University

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