It is good to hear from you again. You might consider checking with your neurologist about this question. I'm not a medical professional but I do take a magnesium supplement in the evening. My PCP said it is good for constipation and most of us with PD do have that problem. From what I understand magnesium is also good for the muscles, which include the heart.
In looking up this on "google" I don't see much in the way of scholarly articles.
Let us know if you find out more about this.
By the way, the last time you posted, you were starting the patch. Is that working well for you? I look forward to hearing from you again.