The study tested 36 patients aged 23-70 with rheumatoid arthritis (RA) or ankylosing spondylitis (AS) with treatment consisting of eight sessions over four weeks in a 194 ºF infrared sauna. The primary measures were patient perceptions of:
The secondary outcome considered was range of motion of 28 different joints. Both outcomes were measured directly before and after sauna treatment.
The patients experienced less pain and improved physical functioning as a result of using an infrared sauna. Despite the theoretical possibility of negative effects on disease activity, in the clinical series, no aggravation of inflammation activity was seen.