@steelerfanjoe @prettypatti76 @gud2gro, here is information from Mayo Clinic about vagus nerve stimulation:

- Vagus nerve stimulation
https://www.mayoclinic.org/tests-procedures/vagus-nerve-stimulation/about/pac-20384565
Vagus nerve stimulation involves using a device to send electrical impulses to the vagus nerve. There are various devices that have been approved for use by FDA including some that require implantation under the skin in the chest. "There are newer vagus nerve stimulation devices that don't need surgery to implant the device. The FDA has approved one such device in the United States to treat cluster headaches and migraine. This device works by holding it against the skin of the neck. The device blocks pain signals to prevent or relieve head pain."

Here's one study I found:
- Non-invasive vagus nerve stimulation and exercise capacity in healthy volunteers: a randomized trial https://academic.oup.com/eurheartj/article/46/17/1634/8023896

= Mayo Clinic Minute: How vagus nerve stimulation can help some patients improve their recovery after stroke https://newsnetwork.mayoclinic.org/discussion/mayo-clinic-minute-how-vagus-nerve-stimulation-can-help-some-patients-improve-their-recovery-after-stroke/