ABSTRACT

　The purpose of this study was to clarify the factors associated with changes in trunk intramuscular adipose tissue （IntraMAT） content over one year in young and elderly women. Twelve young women （age: 19.4 ± 1.3 years, body mass index （BMI） : 20.0±2.6 kg/m2） and 18 elderly women （age: 72.7±3.1 years, BMI: 21.8±2.7 kg/m2） participated. IntraMAT content at the third lumbar level was measured using magnetic resonance imaging. In addition to fasting blood tests, we assessed total energy expenditure and the percentage of energy from major nutrients using questionnaires. These items were measured twice with a one-year interval. As a result, among the percent changes （Δ） of each item in young women, ΔIntraMAT content had a significant correlation with Δtotal energy expenditure, Δprotein, and Δcarbohydrate （r = -0.726 to 0.642）．In elderly women, Δ IntraMAT content significantly and positively correlated with Δfat and Δsaturated fatty acids（ r = 0.516 and 0.523）．These results suggest that the content of trunk IntraMAT might be influenced by daily physical activity and the percentage of energy from dietary macronutrients.

DECENTE SPORTS SCIENCE Vol.47/The DESCENTE AND ISHIMOTO MEMORIAL FOUNDATION FOR THE PROMOTION SPORTS SCIENCE