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Applicability of segmental bioelectrical impedance analysis for predicting trunk skeletal muscle volume

¹Department of Life Sciences (Sports Sciences), University of Tokyo, Tokyo; ²Division of Health Promotion and Exercise, National Institute of Health and Nutrition, Tokyo; and ³Department of Sport Sciences, School of Human Sciences, Waseda University, Saitama, Japan

Submitted 27 January 2005 ; accepted in final form 29 September 2005

This study aimed to investigate the validity of using segmental bioelectrical impedance (BI) analysis for estimating skeletal muscle volume (MV) in the trunk, defined as the body segment from the acromion process to the greater trochanter. Using a magnetic resonance imaging (MRI) method, the trunk MV was determined in 28 men (1934 yr), divided into validation (n = 20) and cross-validation (n = 8) groups, and used as a reference (MV_MRI). For BI measurements of the trunk, the source electrodes were placed at the dorsal surface of the third metacarpal bone of both hands and the dorsal surface of the third metatarsal bone of both feet, and the detector electrodes were placed at the acromion process of both shoulders and the greater trochanter of both femurs. Using this arrangement, the BI values of five parts of the trunk, both sides of the upper region, the middle region, and both sides of the lower region, were obtained and then used to calculate the whole trunk BI value and BI index (BI index_TR). In the validation group, a simple regression analysis of the relationship between BI index_TR and MV_MRI showed a significant correlation between the two variables (r = 0.884, P < 0.05) and produced a prediction equation with a SE of estimation of 1,020.3 cm³ (8.5%). In the validation and cross-validation groups, there were no significant differences between the measured and estimated MV without systematic errors. These findings indicate that the segmental BI analysis employed in the present study can be used to estimate trunk MV.

human body composition; magnetic resonance imaging; muscle distribution; validation; cross validation

This article has been cited by other articles:

				N. I. Tanaka, M. Miyatani, Y. Masuo, T. Fukunaga, and H. Kanehisa Applicability of a segmental bioelectrical impedance analysis for predicting the whole body skeletal muscle volume J Appl Physiol, November 1, 2007; 103(5): 1688 - 1695. [Abstract] [Full Text] [PDF]