Regular sauna use might improve cardiovascular function by enhancing blood circulation and possibly aiding in blood pressure regulation. Keeping a journal of your experiences, and noting any shifts in heart-related metrics, can provide beneficial feedback. If you experience any discomfort or unusual cardiovascular reactions, it's vital to modify the regimen or seek advice from a cardiologist or health specialist. Safety is paramount, especially regarding heart health. Do remember, exposure to high temperatures can be intense for the body, and those with pre-existing heart conditions should approach this method with extreme caution and always under expert supervision.