Use of illicit amphetamines is associated with long-lasting changes in hand circuitry and control

Verity Pearson-Dennett, Patrick L. Faulkner, Brittany Collie, Robert A. Wilcox, Adam P. Vogel, Dominic Thewlis, Adrian Esterman, Michelle N. McDonnell, Simon C. Gandevia, Jason M. White, Gabrielle Todd

Research output: Contribution to journalArticlepeer-review

4 Citations (Scopus)

Abstract

Objective: The study aim was to determine if use of illicit amphetamines or ecstasy is associated with abnormal excitability of the corticomotoneuronal pathway and manipulation of novel objects with the hand. 

Methods: Three groups of adults aged 18–50 years were investigated: individuals with a history of illicit amphetamine use, individuals with a history of ecstasy use but minimal use of other stimulants, and non-drug users. Transcranial magnetic stimulation was delivered to the motor cortex and the electromyographic response (motor evoked potential; MEP) was recorded from a contralateral hand muscle. Participants also gripped and lifted a novel experimental object consisting of two strain gauges and an accelerometer. 

Results: Resting MEP amplitude was larger in the amphetamine group (6M, 6F) than the non-drug and ecstasy groups (p < 0.005) in males but not females. Overestimation of grip force during manipulation of a novel object was observed in the amphetamine group (p = 0.020) but not the ecstasy group. 

Conclusions: History of illicit amphetamine use, in particular methamphetamine, is associated with abnormal motor cortical and/or corticomotoneuronal excitability in males and abnormal manipulation of novel objects in both males and females. 

Significance: Abnormal excitability and hand function is evident months to years after cessation of illicit amphetamine use.

Original languageEnglish
Pages (from-to)655-665
Number of pages11
JournalClinical Neurophysiology
Volume130
Issue number5
DOIs
Publication statusPublished - May 2019

Keywords

  • Ecstasy
  • Excitability
  • Hand function
  • Methamphetamine
  • Motor cortex
  • Transcranial magnetic stimulation

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