Info on Z-Wave packet transmission

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Hi,
I'm a complete newbie in home automation. I'm interested in making my light switches wireless, so that I can toggle them through my mobile phone, but at the same time be able to use the existing buttons on the wall as an alternative. For that purpose, I thought about installing Fibaro switches right behind the existing light switches.

 

Now, one thing that is of great importance to me, is minimizing the amount of time that these devices are actively transmitting data, as I'm concerned about exposure to electromagnetic fields. Ideally, I would like transmissions to be made only when I try to toggle the status of a switch through my mobile phone, or when I press the button on the wall and the switch needs to report the new status back to the Z-Wave hub that I'll use. I do realize, however, that there probably needs to be some periodic polling as well, or something like that, in order for the network status to be actively monitored (I may be wrong, though). So I tried to find a clear answer on how often the Z-Wave technology is designed to transmit when all the devices are idle, but failed. I did find some information on the "1% duty cycle", but it's still not very clear to me. I understand that there may be no simple answer to my question, but I was hoping that maybe someone could shed some light on this topic.

 

Thanks in advance.