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The logger has no external wires, which makes it especially simple to implant. The logger is hermetically sealed for biocompatibility.
||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 (electrocardiogram) in which the electrodes are part of the housing material, making the logger especially easy to implant. For heart rate the logger takes a burst measurement on any set time interval and calculates the mean heart rate for each recording. Each recorded burst measurement consists of 600 measurements. For validation purposes, each individual burst is graded with a certain QI (quality index) accessible in the accompanying 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.
|ACT Index 0: no activity, 1: low, 2: medium, 3: high|
Stress-Free Long-Term Studies
The activity logger can store up to 233,017 3-axis accelerometer, heart rate and temperature measurements per sensor and 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. The logger can easily be sterilized and reused as long as the battery lasts.
Different Measurement Intervals
Optionally, the loggers can be programmed with up to seven different intervals within a measurement sequence. This can, for example be useful when different intervals are preferred during the day or night, or different seasons.
Simple in Use, From Setup to Data Retrieval
The DST centi-HRT ACT is supported by the Mercury software and a Communication Box which has to be purchased with the first order. The communication box serves as an interface between the logger and a PC computer. After recovering the logger, recorded data is uploaded to the software where the results are displayed both in graphic and tabular form. The data can be exported to other programs.
|Modèle||DST Centi HRT||DST micro-HRT||DST milli-HRT|
|Sensors||Temperature, heart rate|
|Size (diameter x length)||15mm x 46mm||8.3mm x 25.4mm||13mm x 38.4mm|
|Housing material||Alumina (Ceramic)|
|Weight (in air/in water)||in air: 19g
in water: 12g
|Memory type||Non-volatile EEPROM||Non-volatile EEPROM||Non-volatile EEPROM|
|Memory capacity||233,017 measurements per sensor (if all parameters are recorded simultaneously)||21844 measurements||21844 measurements|
|Memory capacity bytes||2,097,152 bytes / HR+T 3 bytes, acceleration 6 bytes|
|Memory management||- Custom programming
- Primary and secondary parameter
|Data resolution||12* bits for temperature, 13 bits for acceleration||12 bits||12 bits|
|Temperature resolution||0.032°C (0.058°F)||0.032°C (0.058°F)||0.032°C (0.058°F)|
|Temperature accuracy||+/-0.1°C (0.18°F)||+/- 0.2 °C (+/- 0.36°F)||+/- 0.2 °C (+/- 0.36°F)|
|Temperature range||5°C to +45°C (41°F to 113°F)**||5°C to 45°C (32°F to 113°F)||5°C to 45°C (32°F to 113°F)|
|Temperature response time||Time constant (63%) reached in 20 sec.||Time constant (63%) reached in 20 sec.||Time constant (63%) reached in 20 sec.|
|Data retention||25 years|
|Clock||Real time clock
Accuracy +/-1 min/month
|Sampling interval||User programmable|
|Number of different sampling intervals||1 to 7 different intervals within a measurement sequence|
|Communications||Communication Box, RS-232C 9 pin serial or USB|
|Attachment hole||0.9 mm (in diameter)|
|Battery life||19 months***||4 months*||9.5 months*|
* Adjusted resolution **Outside ranges available upon request
*** For sampling interval of 10 minutes; heart-rate activity and temperature recorded simultaneously. Specifications may change without notice.