The purpose of this study was to determine the factors that influence the sitto-stand (STS) reaction time from the trunk flexion angle and ground reaction force parameters during STS movement. The participants included 3０ healthy young women (mean age ２０.１ ± １.０ years). The STS reaction time was measured by a test in which STS movements were performed after recognition of a light stimulus, and the trunk flexion angle and ground reaction force parameters (Peak reaction force per body weight, Rate of force development, Center of pressure moving distance, Trunk flexion time (T０), The time span of the developing force (T１), The chair-rise time (T２)) were evaluated. The results showed that the trunk flexion angle and three time-related parameters (T０, T１, T２) were significantly correlated with STS reaction time. Multiple regression analysis with STS reaction time as the dependent parameter and age, BMI, trunk flexion angle, T０, T１, and T２ as independent parameters revealed that only T１ was extracted as a significant influencing factor for STS reaction time. These results suggested that the possibility of evaluation of STS reaction time for agility by focusing on T１ among the ground reaction force parameters.

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Dynamic postural control ability is necessary for fall prevention in our daily lives. It has been suggested that dynamic postural control ability is highly related to the muscles in the trunk as well as the lower limbs for the keep and move of the body. In this study, we reveal relationship between dynamic postural control ability and abdominal area. Subjects including 31 middle-aged people consist of 12 men and 19 women (mean age 60.0±7.6 years). We measured visceral fat area and cross-sectional area of the trunk muscle using abdominal computed tomography scan. The unstable tilt board is used for measuring dynamic postural control ability. Through multiple regression analysis, it is possible to relate dynamic postural control ability from gender, visceral fat, and deep trunk muscle such as psoas major muscle on abdominal computed tomography scan. It is considered that dynamic postural control ability involved not only increasing the volume of deep trunk muscle but also decreasing the amount of visceral fat.

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