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KMID : 0613820140240101125
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Journal of Life Science
2014 Volume.24 No. 10 p.1125 ~ p.1131
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Comparison of the Thigh Composition and its Functional Contractility in Obese and Nonobese Elderly Patients
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Choi Seung-Jun
Park Sung-Mo
Kwak Yi-Sub
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Abstract
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The purpose of this study was to investigate the relationship between quadriceps composition and its functional contractility in obese and nonobese elderly individuals. Thirty-four (70±2 yr) individuals (obese, n=21; nonobese, n=13) participated in the study. The thigh composition was assessed with a CT scan, and its functional contractility was measured with an isotonic dynamometer. Variables were analyzed with a 2×2 two-way ANOVA and a contrast test (p<0.05). There were no between-group differences in the subjects’ ages and heights, but individuals in the obese group were approximately 23% heavier and had 18% more fat than those in the nonobese group, regardless of gender. The total thigh volume of the obese elderly was greater (~29%) than that of the nonobese elderly, regardless of gender, and the fat volume (~39%) of the obese elderly was greater than that of the nonobese elderly, regardless of gender (p<0.05). Interestingly, the obese elderly tended to have a greater thigh muscle volume (~17% for males [p<0.05] and ~10% for females) than the nonobese. Despite the greater muscle volume, the peak knee extensor torque of the two groups was comparable or slightly greater in the obese individuals. However, when this was normalized by the total thigh volume, the nonobese males showed significantly greater peak torque (~26% for right and ~20% for left; p<0.05) compared to the obese males. The nonobese females also showed greater peak torque (~8% for both legs) than the obese females after normalization, but the result was not statistically significant. In conclusion, although the obese elderly individuals had greater quadriceps muscle mass than the nonobese, the normalized peak torque of the obese was significantly lower than that of the nonobese, implying a lower degree of muscle contractility.
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KEYWORD
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Intermuscular fat, obesity, sarcopenia, thigh muscle, thigh muscle power
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