I don’t know of any specific articles on harp and health, but there are a lot of suggestions and problems here and there in the forums. I’m not aware of any health problems except physical injuries and conditions, or emotionally induced states.
If you go to this web site, http://www.sciandmed.com/mppa/, you will find the journal Medical Problems of Performing Artists. There is also an excellent book by Dr. Richard Norris called “The Musician’s Survival Manual.”