what hormones increase rmr
Other determinants of resting metabolism include thyroid hormones and catecholamines, genetics, body temperature, and in women, the phase of the menstrual cycle. An increased release of thyroid hormones or catecholamines increases RMR. Conversely, a reduction in energy intake specifically decreases triiodothyronine (T3) levels and norepinephrine release, which can subsequently decrease metabolic rate.