The Japan Society for the Promotion of Science, Faculty of Sport Sciences, Waseda University, 2-579-15 Mikajima, Tokorozawa, Saitama, 359-1192, Japan.
Eur J Appl Physiol. 2010 Mar;108(4):689-94. doi: 10.1007/s00421-009-1269-1. Epub 2009 Nov 11.
The present study examined the age-related changes in muscle thickness (MT) and volume (MV) of elbow flexors and developed a prediction equation of the MV based on the MT applicable to men and women with a wide range of age. The MT and MV were determined from a single ultrasonographic image and multiple magnetic resonance imaging scans, respectively, in 72 men and 75 women aged 19-77 year. As a result of examining the age-MT and age-MV relationships by calculation of partial correlation coefficients with the control variable of gender, MV was decreased with aging whereas the corresponding decline in MT was not significant. The subjects were randomly separated into either a validation (38 men and 42 women) or a cross-validation (34 men and 33 women) group, and a multiple regression equation to estimate MV using not only MT but also upper arm length (L), age and gender as independent variables [MV (cm(3)) = 60.8 x MT (cm) + 6.48 x L (cm) - 0.709 x age (year) + 51.4 x gender (0 women, 1 men) - 187.4] was validated and cross-validated. Thus, the prediction equation for MV of elbow flexors newly developed was shown to be applicable to men and women with a wide range of age.
本研究旨在探讨肘部屈肌的肌肉厚度（MT）和体积（MV）随年龄的变化，并建立一个基于 MT 的 MV 预测方程，适用于年龄跨度较大的男性和女性。MT 和 MV 分别通过单次超声图像和多次磁共振成像扫描确定，研究对象为 19-77 岁的 72 名男性和 75 名女性。通过计算偏相关系数并控制性别变量，研究了年龄与 MT 和年龄与 MV 的关系，结果表明 MV 随年龄的增长而下降，而 MT 的相应下降并不显著。将受试者随机分为验证组（38 名男性和 42 名女性）和交叉验证组（34 名男性和 33 名女性），建立了一个使用 MT 以及上臂长度（L）、年龄和性别作为自变量来估计 MV 的多元回归方程[MV（cm(3))=60.8xMT（cm）+6.48xL（cm）-0.709xage（year）+51.4xgender（0 women, 1 men）-187.4]，并对其进行了验证和交叉验证。因此，新建立的肘部屈肌 MV 预测方程适用于年龄跨度较大的男性和女性。
