Theoretically it is supposed to raise your core body temperature, which subsequently would increase your body's affinity for oxygen, which stimulates the heart rate to increase and work harder, which if used for long periods of time, could cause myocardial enlargement and lead to muscle damage and/or heart failure. I dont think that all of this is very likley though. I would just closley monitor heart rate and blood pressure as well as your temperature.
Hope this helped?