Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Noninvasive method for electrocardiogram recording in conscious rodents
  with the electro-conductive liquid electrodes   Existing methods of heart rate recording in animals have shortcomings, which
significantly obscure the influence of experimental factors on heart rate. We
have developed a method of electrocardiographic recording of heart rate in rats
without these drawbacks. To contact the animal limbs used liquid electrodes
which are two small baths filled with conductive fluid (saline solution). To
provide the relative immobility (and quiet) of the animal the two baths was
covered with a dark chamber without a bottom and with an entrance for the rat.
During the experiment, a rat placed near the chamber comes into it (for the
innate preference for darkness) and locates itself inside with its head for the
exit. At that moment ECG recording starts. This method allows to record heart
rate in the intact rodents (without anesthesia and stress) and does not require
substantial preparation. It is not suitable for standard ECG analysis of the
heart condition and function, but this is a good way for recording heart rate
for the further analysis of its variability.

36
The categories of this paper are: cmp-lg
28
The categories of this paper are: alg-geom
13
The categories of this paper are: quant-ph
7
The categories of this paper are: hep-th
24
The categories of this paper are: dg-ga
9
The categories of this paper are: nlin
33
The categories of this paper are: plasm-ph
17
The categories of this paper are: q-fin
11
The categories of this paper are: hep-lat
5
The categories of this paper are: gr-qc
18
The categories of this paper are: econ
19
The categories of this paper are: eess
12
The categories of this paper are: nucl-th
6
The categories of this paper are: astro-ph
15
The categories of this paper are: nucl-ex
8
The categories of this paper are: hep-ex