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Holter monitoring is a continuous electrocardiography (ECG) recording that tracks the heart's electrical activity over an extended period, generally 24 to 48 hours. This noninvasive diagnostic tool detects irregular heart rhythms that may not be captured during a standard ECG performed in a clinical setting.DeviceThe Holter monitor is a portable, small device connected to several electrodes on the patient's chest. These electrodes detect the heart's electrical signals and transmit them to the...

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Individual Variability in Physiological Responses and Psychological Conditions Associated With Methamphetamine Use:

Ayumi Takano1, Kayo Okuda2, Jun Sese2

  • 1Department of Drug Dependence Research, National Institute of Mental Health, National Center of Neurology and Psychiatry, 4-1-1 Ogawa-Higashi, Kodaira, Tokyo, 187-8553, Japan, 1 42-346-1861.

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Digital tools reveal significant heart rate increases and sleep disruption following methamphetamine use. Individual differences in craving and heart rate highlight the need for personalized digital interventions for substance use disorder.

Keywords:
digital therapeutic interventionecological momentary assessmentmethamphetaminemobile appphysiological dataself-monitoringwearable device

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Area of Science:

  • Digital mental health
  • Substance use research
  • Physiological monitoring

Background:

  • Digital mental health tools offer novel ways to monitor and reduce harms from substance use.
  • Limited research exists on digital tools for methamphetamine (MAMP) use, especially concerning individual physiological and psychological variability.

Purpose of the Study:

  • To explore inter- and intraindividual differences in craving, emotion, and heart rate related to MAMP use.
  • Utilized wearable (Fitbit) and mobile self-monitoring data.

Main Methods:

  • Collected physiological (heart rate, sleep) and self-reported data (MAMP use, craving, emotion) from 7 MAMP use disorder outpatients over 8 weeks.
  • Analyzed correlations between MAMP use frequency, physiological indicators, and emotional status.
  • Assessed heart rate trends before/after MAMP use using linear mixed effects models.

Main Results:

  • MAMP use patterns varied, often occurring morning/night.
  • Craving and negative emotions correlated positively with MAMP use frequency.
  • Higher MAMP use frequency linked to higher resting heart rates.
  • Heart rate significantly increased post-MAMP use, lasting up to 9 hours.
  • Sleep duration and frequency were reduced on MAMP use days.
  • Interindividual differences accounted for 64% of heart rate variance; intraindividual for 12%.

Conclusions:

  • Digital tools are feasible for studying MAMP use in real-world settings.
  • Persistent cardiovascular activation and disrupted sleep indicate risks of MAMP use.
  • Individual variability in responses necessitates personalized digital interventions.
  • Integrating real-time monitoring and digital therapies may improve outcomes for MAMP use disorder.