For those asking about whether sauna would produce a similar effect - I'd say yes. However

Well SupportedPost-workout hot water immersion (40°C) for 10 minutes enhances strength gains by approximately 9.3%, which is nearly double the increase seen with a hot shower.

Partially SupportedSauna use may mimic cardiovascular exercise by increasing heart rate to 150 beats per minute.

Partially SupportedSauna may have anti-catabolic effects.

Partially SupportedAdding light pedaling during post-workout hot water immersion provides no additional strength gain benefits compared to heat stimulus alone.

Not Supported