Influence factors on reaction time by sit-to-stand movement in healthy young women

Abstract

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.