Low-attenuation muscle (LAM) area at mid-thigh, a computed tomography (CT)–derived index of intramuscular lipids, is associated with insulin resistance, obesity, and type 2 diabetes. The present study aimed at testing the hypothesis that changes in LAM area in trunk muscles from a single abdominal scan could provide relevant information to evaluate the effects of a lifestyle intervention without the use of a mid-thigh CT scan.
Cardiometabolic risk variables, including waist circumference, lipoprotein–lipid profile, glucose tolerance, and cardiorespiratory fitness, were assessed in a sample of 102 dyslipidemic viscerally obese men at baseline and after a 1-yr lifestyle intervention. Abdominal (L4–L5) and mid-thigh CT scans were performed and abdominal muscles classified as psoas and core muscles. Scans were segmented to calculate muscle areas, LAM areas, and mean attenuation values.
All muscle groups showed a decrease in LAM areas (P < 0.0001) in response to the lifestyle intervention. Changes in LAM areas were significantly associated with changes in triglycerides, high-density lipoprotein (HDL) cholesterol, cholesterol/HDL cholesterol ratio and log triglycerides/HDL cholesterol ratio (mid-thigh, 0.20 ≤ |r| ≤ 0.29; psoas, 0.28 ≤ |r| ≤ 0.38; core, 0.29 ≤ |r| ≤ 0.34, P < 0.05). Changes in core LAM area were significantly associated with changes in 2-h glucose levels, glucose area measured during the oral glucose tolerance test and homeostasis model assessment of insulin resistance (0.21 ≤ r ≤ 0.34, P < 0.05). Stepwise regression analyses showed that changes in LAM psoas area were associated with changes in HDL cholesterol and the cholesterol/HDL cholesterol ratio independently from changes in visceral adiposity.
Changes in trunk LAM areas are useful indices of changes in mid-thigh LAM area observed with a 1-yr lifestyle intervention. Thus, an additional mid-thigh scan is not necessary to evaluate muscle lipid content by CT when an abdominal CT scan is available.
1Centre de recherche de l’Institut universitaire de cardiologie et de pneumologie de Québec–Université Laval, Québec, QC, CANADA
2Department of Kinesiology, Faculty of Medicine, Université Laval, Québec, QC, CANADA
3Endocrinology and Nephrology Unit, CHU de Québec, Université Laval Research Center, Québec, QC, CANADA
4Faculty of Pharmacy, Université Laval, Québec, QC, CANADA
Address for correspondence: Jean-Pierre Després, Ph.D., Centre de recherche de l’Institut universitaire de cardiologie et de pneumologie de Québec–Université Laval 2725, chemin Sainte-Foy, A-2087 Québec QC G1V 4G5, Canada; E-mail: email@example.com.
Submitted for publication January 2019.
Accepted for publication April 2019.
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Online date: May 4, 2019