File(s) not publicly available

Time-of-day mediates the influences of extended wake and sleep restriction on simulated driving

journal contribution
posted on 06.12.2017, 00:00 by Raymond Matthews, Sally Ferguson, Xuan Zhou, Charli Sargent, David Darwent, D Kennaway, Gregory Roach
Although a nonlinear time-of-day and prior wake interaction on performance has been well documented, two recent studies have aimed to incorporate the influences of sleep restriction into this paradigm. Through the use of sleep restricted forced desynchrony protocols, both studies reported a time-of-day x sleep restriction interaction, as well as a time-of-day x prior wake x sleep dose three-way interaction. The current study aimed to investigate these interactions on simulated driving performance, a more complex task with ecological validity for the problem of fatigued driving. The driving performance of 41 male participants (mean SD: 22.8 2.2 yrs) was assessed on a 10-min simulated driving task with the standard deviation of lateral position (SDLAT) measured. Using a between-group design, participants were subjected to either a control condition of 9.33 h of sleep/18.66 h of wake, a moderate sleep-restriction (SR) condition of 7 h of sleep/21 h of wake, or a severe SR condition of 4.66 h of sleep/23.33 h of wake. In each condition, participants were tested at 2.5-h intervals after waking across 7 x 28h d of forced desynchrony. Driving sessions occurred at nine doses of prior wake, within six divisions of the circadian cycle based on core body temperature (CBT). Mixed-models analyses of variance (ANOVAs) revealed significant main effects of time-of-day, prior wake, sleep debt, and sleep dose on SDLAT. Additionally, significant two-way interactions of time-of-day x prior wake and time-of-day x sleep debt, as well as significant three-way interactions of time-of-day x prior wake x sleep debt and time-of-day x sleep debt x sleep dose were observed. Although limitations such as the presence of practice effects and large standard errors are noted, the study concludes with three findings. The main effects demonstrate that extending wake, reducing sleep, and driving at poor times of day all significantly impair driving performance at an individual level. In addition to this, combining either extended wake or a sleep debt with the early morning hours greatly decreases driving performance. Finally, operating under the influence of a reduced sleep dose can greatly decrease performance at all times of the day.

Funding

Category 1 - Australian Competitive Grants (this includes ARC, NHMRC)

History

Volume

29

Issue

5

Start Page

572

End Page

579

Number of Pages

8

eISSN

1525-6073

ISSN

0742-0528

Location

United Kingdom

Publisher

Informa Healthcare

Language

en-aus

Peer Reviewed

Yes

Open Access

No

External Author Affiliations

Centre for Sleep Research; Robinson Institute; TBA Research Institute;

Era Eligible

Yes

Journal

Chronobiology international : the journal of biological and medical rhythm research.