Great thanks for Sara Mariani and mrueschman. I'll have a try.
In the discription of SHHS dataset, I found that :
The recording montage consisted of:
C3/A2 and C4/A1 EEGs, sampled at 125 Hz
right and left electrooculograms (EOGs), sampled at 50 Hz
a bipolar submental electromyogram (EMG), sampled at 125 Hz
thoracic and abdominal excursions (THOR and ABDO), recorded by inductive plethysmography bands and sampled at 10 Hz
“airflow” detected by a nasal-oral thermocouple (Protec, Woodinville, WA), sampled at 10 Hz
finger-tip pulse oximetry (Nonin, Minneapolis, MN) sampled at 1 Hz
ECG from a bipolar lead, sampled at 125 Hz for most SHHS-1 studies and 250 Hz for SHHS-2 studies
Heart rate (PR) derived from the ECG and sampled at 1 Hz
body position (using a mercury gauge sensor)
ambient light (on/off, by a light sensor secured to the recording garment)
So my first question is: Does there contain Heart rate signals in the EDF files?
In fact, I have had a try to read the edf files in matlab. No matter what kinds of signals, there are many extreme values (value >1000) appears regularly (one in 635 data points). I don't know why. Maybe there is a mistake in the reading code, but unfortunately, I haven't found it. Could you kindly do me a favor? I suppose the following sentence have a mistake:
data = fread(fp,'int16');
There comes my second question : Is the signal data in edf files stored in "int16" type?
Thank you very much for precious time. Looking forward for your kind reply.
Thank you :)
Excuse me, mrueschman. Could you please tell me what's the abbreviation “MD” in the sentence "MD said participant had heart failure?" standing for?
The sentence "MD said participant had heart failure?" appears in the website of https://sleepdata.org/datasets/shhs/variables/hf15.
I have try my best to find out that, however I failed.
Ok, mrueschman, i have got it.
You are very kind and I'm grateful for your help to my work. Best wishes to you.
Thanks you very much, mrueschman.
Is there any HRV-extract tool available posted for SHHS?
Thank you very much. I have got the needed information.
Would you please tell me what is the process to download the Heart rate (PR) records from SHHS?
Thank you for your precious time and kind reply again.
Thank you very much for your kind reply.
Just as you mentioned, "Many participants did have sleep-disordered breathing based on the sleep study results, but this was not the case for all participants." , then another question is how can I get the information that which participants don't have sleep-disordered breathing and other cardiovascular diseases? In my project, I need some "health controls" .
Thanks again and looking for your help.