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 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.

For advice on implantation, please contact us.

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.

SensorsHeart rate, activity (3-axes acceleration), temperature
Size (Diameter x Length)15mm x 46mm
Housing MaterialAlumina (Ceramic)
Weight (in Air/in Water)19g/12g
Data Resolution12* bits for temperature, 13 bits for acceleration
Acceleration Resolution4mg
Acceleration Accuracy+/-32mg
Temperature Range5°C to +45°C (41°F to 113°F)**
Temperature Resolution0.032°C (0.058°F)
Temperature Accuracy+/-0.1°C (0.18°F)
Temperature Response TimeTime constant (63%) reached in 20 sec.
Memory TypeNon-volatile EEPROM
Memory Capacity233,017 measurements per sensor
Memory Capacity Bytes2,097,152 bytes / HR+T 3 bytes, acceleration 6 bytes
Memory Mangement– Custom programming, – Primary and secondary parameter
Sampling IntervalUser specified in second(s), minute(s), or hour(s)
Minimum Measuring Interval15 seconds
Multiple Intervals OptionUp to 7 different intervals
Primary/Secondary OptionActivity as primary
Heart Rate Sampling Frequency100-800Hz
Data Retention25 years
ClockReal time clock. Accuracy +/-1 min/month.
CommunicationsCommunication Box, wirelss transmission when DST sits in the box. Connection to PC: USB cable
Attachment Hole0.9 mm (diameter)
Battery Life19 months***
Replaceable BatteryNo

* Adjusted resolution **Outside ranges available upon request *** For sampling interval of 10 minutes; heart-rate activity and temperature recorded simultaneously.
Warranty: 12 months

Simple in Use, From Setup to Data Retrieval
The logger and the accompanying items are designed for ease of use throughout the research process, from setting up the logger, implanting it, to retrieving and analysing the data. The logger is supported by the Mercury software and a Communication Box which have to be purchased with the first order.

Programming the logger
To start the logger for measurements it is placed into a Communication Box and connected to the software. The Communication Box serves as an interface between the logger and a PC computer. In the application software, the user sets the start time, start date and sampling interval before starting the recorder.

Multiple measurement intervals
Different measurement intervals can be set for the same study. This is especially useful when more or less frequent measurements are needed at a certain time period, saving data space and battery.

Memory and battery life calculations
The software automatically calculates when memory fills based on certain interval settings, making it easier for the user to decide how to program the logger. Estimated battery consumption during that time period is also calculated.

Uploading the Data
After recovering the logger, the logger is inserted into the communication box and the recorded data is uploaded to the software. The results are displayed both in graphic and tabular form and the data can be exported to other programs.

After retrieving the data the logger can easily be sterilized and reused as long as the battery lasts. Current battery life can be viewed in the software and the user can get an estimate of how long the logger memory and battery will last in a planned research.

All Star-Oddi loggers are hermetically sealed and leak proof. Therefore the battery is not replaceable.