In this study the investigators aim to investigate whether the sympathetic stimulation of BAT, as assessed with a 123I-metaiodobenzylguanidine single-photon emission computed tomography computed tomography scan, differs between young and elderly subjects, as an explanation for the diminished metabolic brown adipose tissue activity in the elderly. The investigators hypothesis is that sympathetic nervous system activity in the elderly is diminished as compared to their younger counterparts as an explanation for the diminished metabolic brown adipose tissue activity in the elderly.
The sympathetic nervous system is the primary activator of Brown Adipose Tissue. Elderly are known to have less metabolically active brown adipose tissue as compared to their younger counterparts. The reason for this diminished metabolic brown adipose tissue activity is unknown. However, a lower sympathetic nervous system activation to brown adipose tissue in the elderly might explain a diminished metabolic brown adipose tissue. Therefore, in this study, both the sympathetic nervous system activation to brown adipose tissue and the metabolic activity will be measured in young and older subjects. sympathetic nervous system activity will be measured using 123I-metaiodobenzylguanidine single-photon emission computed tomography computed tomography scans, metabolic activity will be measured using 18F- fluorodeoxyglucose positron emission tomography CT scans.
Study Type
OBSERVATIONAL
Enrollment
16
Academic Medical Center
Amsterdam, Netherlands
Difference in sympathetic stimulation to BAT between young and older individuals
Time frame: Participants will be followed for a mean duration of 2 weeks (the maximal time period between the two scans) The outcome measurements will be assessed when the last subject has been scanned approximately one year after starting the trial.
Difference in correlation between sympathetic stimulation of BAT as assessed with 123I-MIBG SPECT scans and metabolic BAT activity as assessed with 18F-Fluorodeoxyglucose(FDG)- positron emission tomography(PET)-CT scan in young and older individuals
The difference in correlation between sympathetic stimulation of BAT as assessed with a MIBG SPECT-CT scan, and BAT activity itself as assessed with 18F-FDG-PET-CT, between young and elderly subjects
Time frame: Participants will be followed for a mean duration of 2 weeks (the maximal time period between the two scans) The outcome measurements will be assessed when the last subject has been scanned approximately one year after starting the trial.
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