|（1.Department of Physical Education，Guangdong University of Foreign Studies，Guangzhou 510006，China；2.Department of Kinesiology，Katholieke Universiteit Leuven，Leuven 3000，Belgium)
Abstract: In order to probe into the repeatability of measuring foot intrinsic muscle morphology by using ultrasonic technology, and to study the effects of foot intrinsic muscles on maintaining human body stability by analyzing the correlation between foot intrinsic muscle morphology and eyes closed single leg standing time, the authors repeat-edly measured the longitudinal and cross-sectional images of such 4 foot intrinsic muscles as flexor digitorum bre-vis, flexor hallucis brevis, abductor hallucis and abductor digiti minimi of 15 healthy young testees by using type B ultrasonic technology, measured muscle thicknesses and cross-sectional areas by using image processing software ImageJ, and performed an interclass correlation coefficient (ICC) analysis on two sets of measurement data by using data processing software SPSS, so as to verify the repeatability of this test method; in the mean time, the authors also measured eyes closed single leg standing time in order to evaluate balance stability, analyzed the Pearson coef-ficients of correlation between eyes closed single leg standing time and the morphologies of the four foot intrinsic muscles, and probed into the effects of foot intrinsic muscle morphology on static balance ability. The authors re-vealed the following findings: most ICC values of two sets measurement values of foot intrinsic muscle thicknesses and cross-sectional areas measured by using ultrasonic technology were greater than 0.9, which means that the re-peatability of this test method is good; the thickness of abductor hallucis and the cross-sectional areas of flexor digitorum brevis and abductor digiti minimi were significantly correlative with eyes closed single leg standing time, while the cross-sectional area of abductor hallucis was very significant correlative with eyes closed single leg standing time; the larger the cross-sectional area of foot intrinsic muscles, the longer the eyes closed single leg standing time. The said findings indicate the followings: the reliability of measuring foot intrinsic muscle morphol-ogy by using type B ultrasonic technology is good; foot intrinsic muscle morphology will affect human body static balance control, its function on foot core area stability should not be neglected.
Key words: sports physiology；foot intrinsic muscle morphology；human body static balance；ultrasonic tech-nology；foot core area