The effect of cannabis on regular cannabis consumers’ ability to ride a bicycle

Abstract

To assess the effects of cannabis on the ability required to ride a bicycle, repetitive practical cycling tests and medical examinations were carried out before and after inhalative consumption of cannabis. A maximum of three joints with body weight-adapted THC content (300 μg THC per kg body weight) could be consumed by each test subject. Fourteen regular cannabis-consuming test subjects were studied (12 males, 2 females). In summary, only a few driving faults were observed even under the influence of very high THC concentrations. A defined THC concentration that leads to an inability to ride a bicycle cannot be presented. The test subjects showed only slight distinctive features that can be documented using a medical test routinely run for persons under suspicion of driving under the influence of alcohol or drugs.

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Acknowledgments

This study was sponsored by VEGaS e. V. (Verein zur Erforschung der Gefahren durch Drogen und andere Rauschmittel im Straßenverkehr).

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Correspondence to Benno Hartung.

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Ethical standards

The experiments of this study comply with the current German laws. The study protocol was pre-approved by the ethics committee of the University Hospital Düsseldorf.

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The authors declare that they have no competing interests.

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Hartung, B., Schwender, H., Roth, E.H. et al. The effect of cannabis on regular cannabis consumers’ ability to ride a bicycle. Int J Legal Med 130, 711–721 (2016). https://doi.org/10.1007/s00414-015-1307-y

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Keywords

  • Cannabis
  • THC
  • Bicycle
  • Ability to ride
  • Ability to drive
  • Driving under the influence
  • DUI
  • Cannabis influence factor
  • CIF