Your Myzone belt is safe to use during pregnancy, yes! As always, it is highly suggested you consult with your physician first before starting a fitness regimen with HR technology during pregnancy. You may see your max heart rate (MHR) change during your pregnancy so it will be important to keep an eye on your Rating of Perceived Exertion and contact your gym or Myzone Technical Support to change your max heart rate.
Be sure to check out this Best Practices for Using Myzone While Pregnant blog for more tips.
Pacemakers, Defibulators, & Stents
While the Myzone belt is safe to use with a pacemaker or ICD, unfortunately, some Myzone users have reported that heart stents or pacemakers can impact heart rate readings when exercising. Since the Myzone belt reads the electrical signals from your heart, the metallic components in your chest or electrical stimulus from a pacemaker may cause the belt to display unusual readings or prevent it from recognizing your heart rate at all. Despite irregular readings some users might get, the belt is still safe to use as neither the black module nor red strap contains magnets that could impact your medical device.