Publications by authors named "Devon A Grant"
Insufficient sleep is a global public health problem resulting in catastrophic accidents, increased mortality, and hundreds of billions of dollars in lost productivity. Yet the effect of sleep deprivation (SD) on decision making and performance is often underestimated by fatigued individuals and is only beginning to be understood by scientists. The deleterious impact of SD is frequently attributed to lapses in vigilant attention, but this account fails to explain many SD-related problems, such as loss of situational awareness and perseveration.
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- The psychomotor vigilance test (PVT) assesses alertness impacted by sleep loss, with new 3-min smartphone and tablet versions being validated against a standard 10-min laptop version.
- During a study with 16 participants undergoing sleep deprivation and recovery, various metrics (lapses, response times) were measured, showing significant changes across test versions and conditions.
- Results indicate that the shorter versions are effective for evaluating alertness changes due to sleep loss, though their sensitivity might improve by adjusting how lapses are defined.
Introduction: The Psychomotor Vigilance Test (PVT) measures effects of fatigue from sleep loss and circadian misalignment on sustained vigilance performance. To promote PVT use in field environments, a 5-min PVT version has been implemented on a personal digital assistant (PDA) with a touch screen. The present laboratory study was conducted to validate this PVT against a standard 10-min laptop PVT across 38 h of total sleep deprivation (TSD).
View Article and Find Full Text PDFBackground: Patients in the ICU are thought to have abnormal circadian rhythms, but quantitative data are lacking.
Methods: To investigate circadian rhythms in the ICU, we studied core body temperatures over a 48-h period in 21 patients (59 ± 11 years of age; eight men and 13 women).
Results: The circadian phase position for 17 of the 21 patients fell outside the published range associated with morningness/eveningness, which determines the normative range for variability among healthy normal subjects.
Objectives: This study assessed the utility of a combined field and laboratory research design for measuring the impact of consecutive night shift work on the sleepiness, vigilance, and driving performance of police patrol officers.
Design: For police patrol officers working their normal night shift duty cycles, simulated driving performance and psychomotor vigilance were measured in a laboratory on two separate occasions: in the morning after the last of five consecutive 10.7-h night shifts, and at the same time in the morning after three consecutive days off duty.