It's good if your body is set up to INCREASE metabolic rates rather than to DECREASE them.
Even Tropical people can survive for a good 20 minutes. The record in the Far North for someone with the correct baggage is 6.5 hours! She's a med tech in a Norwegian hospital.
The lady was older and sick. She may well have been in the early stages of death anyway. The record shows she could have survived much longer than 8 minutes.
square heart ??