I have ECG records in *.GDF format, but I don't know what program to use to analyze heart rate variability. I know there's a kubios program that reads this format, but it is available only in the premium version (I am a poor medical student from Russia)
1)is there a free program, analogues of kubios hrv, working with GDF format?
2) is there a program that extracts R-R intervals from the GDF format?
3) is there a way to convert GDF to other formats to be analyzed in programs (edf e.t.c)?
ps. perhaps there are grammatical errors in this text. I used a google translator. I will be very grateful for any help