Table 3.

Types of intervention and schedule of exposure in the studies included

Study	Type of sauna	Temperature	Duration of single sauna bath	Frequency	Follow‐up(s)
Kihara 2002	Far‐infrared‐ray dry sauna	60°C	15 min	1×/day, 7 times a week	2 weeks
Kihara 2004	Far‐infrared‐ray dry sauna	60°C	15 min	1×/day, 5 times a week	2 weeks
Miyata 2008	Far‐infrared‐ray dry sauna	60°C	15 min	1×/day, 5 times a week	2 weeks
Kihara 2009	Far‐infrared‐ray dry sauna	60°C	15 min	5 days after admission, at least 2 times a week after hospital discharge	5 years
Kuwahata 2011	Far‐infrared‐ray dry sauna	60°C	15 min	1×/day, 5 days a week for 4 weeks	4 weeks
Fujita 2011	Far‐infrared‐ray dry sauna	60°C	15 min	1×/day	4 weeks
Tei 2016	Far‐infrared‐ray dry sauna	60°C	15 min	1×/day, 5 times a week for 2 weeks	2 weeks
Ichiki 2017	Far‐infrared‐ray dry sauna	60°C	15 min	1×/day, 5 times a week for 2 weeks	2 weeks
Basford 2009	Far‐infrared‐ray dry sauna	60°C	15‐20 min	3 times a week for 4 weeks	4 and 4 weeks