It seems like the study used metabolic rate (energy/time unit) and thyroid activity, not body temperature. That being said, metabolic rate probably correlates w

It seems like the study used metabolic rate (energy/time unit) and thyroid activity, not body temperature. That being said, metabolic rate probably correlates with body temperature, but that's not clear. What's interesting is that these people kept a high metabolic rate while doing less activity. It's almost like, if you rest more, your body will have the energy to increase its metabolic rate, or it could be totally physiological and it depends on the person.