• Implantable Data Logger

Implantable Data Logger

  • Heart Rate
  • Activity
  • Temperature

Overview of changes in animal activity and heart rate over time.

Minimally invasive, leadless and simple to implant.

Ideal for use in physiological and behavioral research on large animals.

Key features

  • Leadless, minimally invasive
  • Small, size 46mm x 15mm and 19g
  • Correlation between heart rate and activity
  • Stress-free long-term studies
  • Guaranteed accuracy and performance

Leadless, Minimally Invasive

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

Application

The logger is ideal for a variety of studies including those monitoring behaviour and stress response, in the fields of laboratory animal research, wildlife studies, 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 sensors: 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 monitor and 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.

Stress-Free Long-Term Studies

The activity logger has a battery life of over 19 months, with a sampling interval of 10 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 purchase.

Sensors Heart rate, activity (3-axes acceleration), temperature
Size (Diameter x Length) 15mm x 46mm
Housing Material Alumina (Ceramic)
Weight (in Air/in Water) 19g/12g
Data Resolution 12* bits for temperature, 13 bits for acceleration
Acceleration Resolution 4mg
Acceleration Accuracy +/-32mg
Temperature Range 5°C to +45°C (41°F to 113°F)**
Temperature Resolution 0.032°C (0.058°F)
Temperature Accuracy +/-0.1°C (0.18°F)
Temperature Response Time Time constant (63%) reached in 20 sec.
Memory Type Non-volatile EEPROM
Memory Capacity 699,051 measurements per sensor
Memory Capacity Bytes 2,097,152 bytes / HR+T 3 bytes, acceleration 6 bytes
Memory Mangement - Custom programming, - Primary and secondary parameter
Sampling Interval User specified in second(s), minute(s), or hour(s)
Minimum Measuring Interval 15 seconds
Multiple Intervals Option Up to 7 different intervals
Primary/Secondary Option Activity as primary
Heart Rate Sampling Frequency 100-800Hz
Data Retention 25 years
Clock Real time clock. Accuracy +/-1 min/month.
Communications Communication Box, wirelss transmission when DST sits in the box. Connection to PC: USB cable
Attachment Hole 0.9 mm (diameter)
Battery Life 19 months***
Replaceable Battery No

* Adjusted resolution **Outside ranges available upon request *** For sampling interval of 10 minutes; heart-rate activity and temperature recorded simultaneously. 
Warranty: 12 months
Specifications may change without notice.