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1 School of Physical and Health Education, Queen's University, Kingston, Ontario, Canada
2 School of Physical and Health Education, Queen's University, Kingston, Ontario, Canada; Department of Community Health and Epidemiology, Queen's University, Kingston, Ontario, Canada
3 School of Physical and Health Education, Queen's University, Kingston, Ontario, Canada; Division of Endocrinology and Metabolism, Queen's University, Kingston, Ontario, Canada
* To whom correspondence should be addressed. E-mail: rossr{at}post.queensu.ca.
We evaluated the influence of measurement site on the ranking (low to high) of abdominal subcutaneous (SAT) and visceral (VAT) adipose tissue. We also determined the influence of measurement site on the prediction of abdominal SAT and VAT mass. The subjects included 100 men with computed tomography (CT) measurements at L4-L5 and L3-L4 levels and 100 men with magnetic resonance imaging (MRI) measurements at L4-L5 and 5 cm above L4-L5 (L4-L5 +5 cm). Corresponding mass values were determined using multiple-image protocols. For SAT, 90 and 92 of the 100 subjects for CT and MRI, respectively, had a difference in rank position at the two levels. The change in rank position exceeded the error or measurement for approximately 75% of the subjects for both methods. For VAT, 91 and 95 of the 100 subjects for CT and MRI, respectively, had a difference in rank position at the two levels. The change in rank position exceeded the error or measurement for 36% of the subjects for CT and 8% of the subjects for MRI. For both imaging modalities, the variance explained in SAT and VAT mass (kg) was comparable for L4-L5, L4-L5 +5cm, and L3-L4 levels. In conclusion, the ranking of subjects for abdominal SAT and VAT quantity is influenced by measurement location. However, the ability to predict SAT and VAT mass using single images obtained at the L4-L5, L4-L5 +5cm, or L3-L4 levels is comparable.
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