Here are some links and research to explore...
How Rescue Workers Used “Sauna Detoxification” to Recover from the Chemical Exposure that Occurred Post 9/11:
http://www.townsendletter.com/Dec2006/chemexp1206.htm
How 15 minutes in a sauna a day for 14 days improved the function of the endothelial cells lining the arteries by 40 percent: http://content.onlinejacc.org/article.aspx?articleid=1127811
Lowering weight and waist circumference in 3 months: http://www.diabetes.ca/documents/for-professionals/CJD--June_2010--Beaver,_R.pdf
Greater energy (calories) expenditure: http://content.onlinejacc.org/article.aspx?articleid=1127438
Improvement of pain and stiffness: http://www.ncbi.nlm.nih.gov/pubmed/18685882
Help with fibromyalgia: http://www.prohealth.com/library/showarticle.cfm?libid=13853
The Hubbard Protocol (used with the 9/11 rescue workers): http://suite101.com/a/hubbard-sauna-detoxification-regimen-a161318