Conclusion
Warming is a simple, cheap and non-invasive method to reduce the risk of aBAT. However, the effect of warming decreases with increasing outdoor temperatures and might be completely neutralized, e.g. as soon as air conditioning systems are in operation during the tracer uptake phase. The administration of propranolol appears to be similarly effective to warming and may be considered the first choice in countries where air-conditioning is regularly used. Warming and propranolol seem to have additive effects particularly when outdoor temperatures are low.