Implantable Heart Rate, Activity and Temperature Logger

Overview of changes in animal activity and heart rate over time. Minimally invasive, leadless and simple to implant.

Ideal for use in physiological and behavioural research on animals over 400g.

Key features

  • Leadless, minimally invasive
  • Small, size 13mm x 39.5mm and 12g
  • Correlation between heart rate and activity
  • Stress-free long-term studies
  • Guaranteed accuracy and performance
  • Description

    Leadless, Minimally Invasive

    The heart rate and activity logger DST milli-HRT ACT simultaneously measures long term heart rate, activity and body temperature in the animal. The logger has no external wires, which makes it especially simple to implant. The logger is hermetically sealed for biocompatibility

    For advice on implantation, please contact us.


    The logger is ideal for a variety of studies including those looking at behaviour and stress response, in the fields of laboratory animal research, wildlife research, animal welfare, and fish physiology.

    Correlation Between Heart Rate and Activity

    Looking at heart rate and activity together gives researchers an opportunity to identify correlation between heart rate and activity in the animal, for example in stress response studies. The logger comes with the option of either two or three parameters: activity and temperature or activity, heart rate and temperature. 

    Leadless ECG Derived Heart Rate

    The heart rate is derived from a leadless single channel ECG. As the electrodes are part of the housing the logger is especially easy to implant. The logger takes a burst measurement of ECG at the set time interval and calculates the mean heart rate for each recording. For validation purposes, each individual burst is graded with a QI (quality index) accessible in the application software. 

    Overview of Changes in Animal Activity Over Time

    Measuring acceleration derived activity gives researchers the chance to get an overall view of changes in the study animals’ activity over time. The DST activity loggers measure acceleration in three dimensions, in relation to earth‘s gravity field. Each activity measurement is composed of a burst activity measurement over one minute with a chosen sampling frequency of 0.03Hz-10Hz.

    Stress-Free Long-Term Studies

    The logger has a battery life of over 6 months, when sampling activity, heart rate, and temperature every 20 minutes. The logger is especially useful when a comprehensive data set throughout the research is needed with no disturbance to the animal.

    Single or multiple intervals

    There are two modes for sampling, either at a single interval throughout the period or multiple intervals. Multiple intervals are especially useful when frequent measurements are needed at certain time periods.

    Guaranteed accuracy and performance

    Every logger is individually calibrated and comes with a calibration certificate. We guarantee the loggers’ accuracy and performance for one year after production.