Nonshivering thermogenesis in adults is due to:
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.
Thyroid hormone
Brown fat between the shoulders
Noradrenaline
Muscle metabolism
Endocrine System