Nonshivering thermogenesis in adults is due to:
Thyroid hormone
Brown fat between the shoulders
Noradrenaline
Muscle metabolism
Thyroid hormone Increases the BMR which is responsible for Non-shivering thermogenesis in adults. In children & Infants Brown fat is responsible for thermogenesis. Shivering thermogenesis is by muscle metabolism, heat is produced by muscle contraction.
Endocrine System