Activation of Cervical and Upper Thoracic Brown Adipose Tissue in Humans Via Beta-adrenergic Stimulation
Activation of Cervical and Upper Thoracic Brown Adipose Tissue in Humans Via Beta-adrenergic Stimulation
In this study the investigators aim to quantitate the extent of cervical and upper thoracic brown adipose tissue (BAT) activation in lean and obese humans via positron emission tomography-computed tomography (PET-CT) in response to the non-specific beta adrenergic receptor (AR) agonist ephedrine. The investigators hypothesise that this pharmacological adrenergic stimulus will result in activation of BAT in these participants, and that this activation will be reduced in obese patients. This study will provide important preliminary information with respect to allowing the investigators to progress with longer trials with specific beta 3 AR agonists.
Inclusion Criteria: healthy group
Inclusion Criteria: obese group
The inclusion criteria (Obese participants) of body weight less than ~100 kg is implemented as the PET-CT scanner to be utilised (protocol described subsequently) has a limited patient volume. Therefore to fit within the criteria of BMI > 30, only patients of height ~183 cm or less can be recruited, and inclusion of borderline participants will be discussed with co-investigators from the Alfred Hospital Nuclear Medicine Department.
Exclusion Criteria: healthy group
Exclusion Criteria: obese group