TRIGGERS are based on an INSERT, UPDATE, or DELETE happening. So, you can cause a trigger to fire by simply doing one of those actions - it does not mean you have to change anything:
UPDATE MyTable SET Field1 = Field1
The update trigger would fire and I have not really changed any data.
If you find yourself having to do this regularly, it is a big red flag that you are likely to have a design issue. Triggers are there to act on data changes, so if you need them to act when there is not a data change, you are likely to have misused them.
If this is simply because triggers were disabled for some time and you need them to fire now, I can see that being a reasonable reason for having to do something like this.