Department of Human Biology, Zoological Institute, Christian-Albrechts-University Kiel, Am Botanischen Garten 9, 24118, Kiel, Germany.
Eur J Appl Physiol. 2011 Aug;111(8):1879-87. doi: 10.1007/s00421-010-1795-x. Epub 2011 Jan 14.
Segmental determination of muscle and fat mass (MM, FM) attains growing importance for judging effects of training and malnutrition in older people. This study evaluated the reliability and accuracy of segmental bioelectrical impedance analysis (sBIA) for use in older people. In 72 (40 men, 32 women) healthy elderly (mean age 69.0 ± 4.8 years), the MM and FM of right and left arm (RA, LA), right and left leg (RL, LL), and trunk were determined by sBIA (BC-418-MA, Tanita) and dual-energy X-ray absorptiometry (DXA) as a reference method. The sBIA provided in both sexes reliable values for limb and truncal MM and FM, except for MM of RL in women. The accuracy of sBIA displayed sex-specific bias. For MM, accurate values were noted for men's trunk and women's limbs (except LA). By contrast, MM was significantly underestimated in men's limbs by 6-18% and overestimated in women's LA (13%) and trunk (14%). Estimates of FM were accurate for men's arms as well as women's legs and trunk. However, FM was significantly overestimated in men's legs (34-37%) and trunk (60%), but underestimated in women's arms (27-35%). The proportional deviations of sBIA estimates from DXA values for limbs and trunk were significantly related to the respective MM or FM. The sBIA tends to underestimate MM in men and to overestimate in women. The reverse occurs for FM. The actual equations of the Tanita device may not completely represent the European older population and should be partly revised.
分段确定肌肉和脂肪量（MM、FM）对于判断老年人的训练和营养不良的效果变得越来越重要。本研究评估了分段生物电阻抗分析（sBIA）在老年人中的可靠性和准确性。在 72 名（40 名男性，32 名女性）健康老年人（平均年龄 69.0±4.8 岁）中，通过 sBIA（BC-418-MA，Tanita）和双能 X 射线吸收法（DXA）作为参考方法，分别测定右侧和左侧手臂（RA、LA）、右侧和左侧腿部（RL、LL）以及躯干的 MM 和 FM。sBIA 为男性和女性的四肢和躯干 MM 和 FM 提供了可靠的结果，但女性 RL 的 MM 除外。sBIA 的准确性显示出性别特异性偏差。对于 MM，男性的躯干和女性的四肢（LA 除外）都得到了准确的值。相比之下，男性的四肢 MM 被低估了 6-18%，女性的 LA（13%）和躯干（14%）被高估了。FM 对男性的手臂和女性的腿部和躯干的估计值是准确的。然而，男性的腿部（34-37%）和躯干（60%）的 FM 被高估，而女性的手臂（27-35%）的 FM 被低估。sBIA 估计值与 DXA 值的比例偏差与相应的 MM 或 FM 显著相关。sBIA 倾向于低估男性的 MM，高估女性的 MM。FM 则相反。Tanita 设备的实际方程可能不完全代表欧洲老年人群体，应进行部分修订。
