Hi Wilma,This is an outstanding question, as many of us either choose (or have been forced to employ) "whispering" as our only, or best, means of verbal communication. Sometimes it is the only way we can phonate, and it seems easier than full vocalization. Been there.
There are good ways and bad ways to whisper. If a voice patient needs to whisper, they need to learn the techniques which are least damaging to the larynx and most effective for communication.
I can get you some very pertinent and specific information (but it may take me awhile). I'll send it to your private e-mail.
A year ago, at the International Dystonia Symposium in Miami, FLA we met (and heard an excellent presentation from) a talented Speech Pathologist from North Carolina named Linda Hube. Linda has Adductor Spasmodic Dysphonia. Her presentation also mentioned that SD was in her family; so, unlike many of us, she recognized her symptoms quickly and didn't have to wait years for a diagnosis.
Upon manifesting her first SD symptoms, Linda went to graduate school to get a Master's in the field. Though she still has the symptoms of SD, she "controls" (improves) her SD symptoms with techniques/knowledge.
One of the concepts Linda Hube discussed with us in Miami was "whispering." Whispering in itself is not damaging to the vocal cords, but it's the way it is done. Most people "whisper wrong." Doing it properly (a learned technique) is key.
I can't speak for Linda Hube but I was very impressed with her presentation at the symposium in Miami, with Linda being both an SD patient, as well as a caring and skilled speech pathologist. The information I've provided here was part of her presentation (my interpretation) so I'm not revealing any personal information.
The issue of "whispering" (plusses and minuses) came up in the presentation. I'll try to get you more detailed information, from a professional. It is true that, when performed improperly, whispering isn't good for a larynx. When done right, it's a communication tool.
--Lynne (AD/SD; Northern California)
PS: I equate some of this to breathing. Good and "not so good" ways to do it. Best to learn the right way.