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Psychopharmacology

, Volume 222, Issue 3, pp 401–411 | Cite as

Effects of d-amphetamine on simulated driving performance before and after sleep deprivation

  • Magnus Hjälmdahl
  • Anna Vadeby
  • Åsa Forsman
  • Carina Fors
  • Gunnel Ceder
  • Per Woxler
  • Robert Kronstrand
Original Investigation

Abstract

Rationale

Stimulant drugs are commonly abused and also used to promote wakefulness, yet their effects on driving performance during sleep deprivation have not been thoroughly researched in experimental studies.

Objectives

The aims were to assess the effects on fundamental driving parameters during simulated driving of two doses of d-amphetamine and further to assess the interaction between d-amphetamine and sleep deprivation.

Methods

A double-blind, placebo-controlled experiment including 18 healthy male volunteers was conducted.

Results

The participants felt more alert when taking a dose of d-amphetamine than when taking placebo, and the effect was stronger for the higher dose. However, the data did not show any evidence that taking d-amphetamine prevented the subjects from becoming successively sleepier during the night. A significant main effect of the dose was found for three out of the five primary indicators where the lower dose led to improved driving. These indicators were crossing-car reaction time, and coherence and delay from a car-following event. Regarding sleep deprivation, a main effect was found for four of the primary indicators and three of the secondary indicators. The results showed overall impaired driving with respect to standard deviation of lateral position and delay in reaction time when the sleep-deprived conditions were compared to the alert condition. We found no interactions between dose and sleep deprivation for any of the performance indicators.

Conclusions

Our results suggest that administration of d-amphetamine does not compensate for impairment of driving due to fatigue. The positive effects of 10 mg were not further improved or even sustained when increasing the dose to 40 mg.

Keywords

Amphetamine Sleep deprivation Driving performance Simulator Stimulants 

Notes

Acknowledgments

This study was carried out within the European project DRUID, coordinated by BASt, Germany. DRUID provided 50 % of the funding for the study; 35 % was contributed by VTI, Sweden, and 15 % by VINNOVA, Sweden. The study is one of several coordinated studies within DRUID WP1, methodology and research led by Dr. Anja Knoche at BASt. The specific task within WP1 is Task 1.2, experimental studies led by Dr. Jan Ramaekers of Maastricht University. The analysis of blood was carried out by Dr. Gisela Skopp at Universtätsklinikum Heidelberg, Germany.

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Copyright information

© Springer-Verlag 2012

Authors and Affiliations

  • Magnus Hjälmdahl
    • 1
  • Anna Vadeby
    • 1
  • Åsa Forsman
    • 1
  • Carina Fors
    • 1
  • Gunnel Ceder
    • 2
  • Per Woxler
    • 3
  • Robert Kronstrand
    • 2
    • 4
  1. 1.Swedish Road and Transport Research InstituteLinköpingSweden
  2. 2.Department of Forensic Genetics and Forensic ToxicologyNational Board of Forensic MedicineLinköpingSweden
  3. 3.Department of PsychiatryUniversity HospitalLinköpingSweden
  4. 4.Division of Drug ResearchLinköping UniversityLinköpingSweden

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