ABSTRACT
Objective:To study the human body's sit to stand transfer trajectory and kinematics based on knee joint support to provide a basis for designing the transfer aid with knee joint support. Methods:From April to June, 2019, 20 healthy volunteers were recruited and divided into three groups according to height and gender. Under the premise of knee support, the sit to stand transfer experiments with 20 cm and 30 cm between feet were conducted respectively. All subjects were repeated twice for each experiment with an interval of one minute. High-definition camera was used to record the motion trajectories of each subject's shoulder (armpit) and knee joint during the experiment, and the kinematics rules of subjects with different heights and masses were analyzed. Results:The body forward leaning displacement was less with 20 cm between feet than with 30 cm for subjects less than 172 cm tall; and was less with 30 cm than with 20 cm for subjects more than 173 cm tall. The forward flexion displacement of trunk was less with 20 cm between feet than with 30 cm for subjects with body mass index (BMI) < 23.9 kg/m2; and was less with 30 cm than with 20 cm for subjects with BMI > 23.9 kg/m2. The average time during sit to stand transfer was (1.7±0.05) s. Conclusion:In the process of sit to stand transfer, distance between feet may affect the way of joint extension, the body forward leaning distance and the forward flexion displacement of trunk. With the increase of height and mass, appropriate increase of distance between feet can reduce the difficulty of sit to stand transfer. With the increase of BMI, the time of sit to stand transfer also increases. The time spent on sit to stand transfer is more in female than in male.
ABSTRACT
Objective] To discuss the rule of operation of heaven and earth on the basis of Five Yun and Six Qi and explore the importance on Yun Qi theory. [Method] Using the method of literature studies to explore the rule of Yun Qi theory and operation of heaven and earth. [Result] The theory of Five Yun and Six Qi holds the idea that the Qi of heaven and earth is athletic and the movement is regular.Five Yun concludes Big Yun and Small Yun.Big Yun is Sui Yun,five years a cycle according to the order of‘ wood,fire,earth,gold,water’.Six Qi concludes six steps and moves in circles.Heaven Qi goes left and Earth Qi goes right.The forms of motion concludes QiJiao movement,Sui Yun up and down and so on.Whether the form is normal or not relates much to the nature climate and the human morbidity.[Conclusion ]The theory of Five Yun and Six Qi shows the rule of climate created by the operation of heaven and earth.The regular movement of Five Yun and Six Qi varies a lot,making impact on nature climate and the human morbidity,which is the incisive meaning of the theory of Five Yun and Six Qi in Nei Jing.