This study investigated the effect of visual support information which tracks an operational object on task performance and workload. In the experiment, participants answered the number of the same objects on screen that is presented as visual support information. There were three conditions for presentation of visual support information; tracking condition in which support information tracked the motion of a mouse cursor on a screen, back monitor condition in which support information was presented on the right monitor of the screen, near monitor condition in which support information was presented on a monitor which is in front of participants. Participant’s fatigue was measured with flicker test and “Jikaku-shou sirabe”, and mental workload was measured with the Japanese version of NASA Task Load Index （NASA-TLX）. Results showed that reaction time was the shortest under tracking condition when the largest number of object was presented on the screen. Mental workload was the lowest under tracking condition. Therefore tracking presentation of visual support information facilitated the task performance and decreased mental workload.

This study aims to clarify the effects of length, warning, and congestion on the walking velocity of pedestrians at railroad crossings. Video recordings of 13,386 pedestrians were made at railroad crossings and their walking velocities were calculated. Multiple regression analyses were conducted with the mean and standard deviation of the pedestrians' walking velocity set as the objective variable. The explanatory variables in this study were the length, warning, and congestion at the railroad crossing. Among the explanatory variables that influenced the mean of walking velocity, warning of railroad crossing had the greatest influence. With all other variables being constant, the mean of walking velocity increased by 0.541 m/s when pedestrians entered the railroad crossing after the railroad crossing rod began falling. Among the explanatory variables that influenced the standard deviation of walking velocity, the congestion had the largest influence. With all other variables being constant, the standard deviation of walking velocity decreased by 0.159 m/s when the congestion increased by 1.0 person/m².

This study aimed to investigate the mechanical activity of the knee extensor muscles under isometric contraction with different muscle length conditions. Subjects were 11 healthy men. The knee extensor torque under isometric contraction with hip joint angles of 0° and 90° and knee joint angles of 30°, 60° and 90° was measured using a dynamometer. Integrated electromyography （iEMG）, an indicator of the electrical activity of knee extensor muscles, was measured by surface electromyography; pressure on the target muscle, as an indicator of mechanical activity, was measured using a muscle contraction （MC） sensor. Results showed that iEMG was significantly higher in knee flexion than in knee extension, while the MC ended to be higher in knee extension than in knee flexion. In particular, the knee joint angle strongly influenced the MC value of the vastus medialis oblique. High linearity between torque and MC value was also seen for all conditions. From these results, it was suggested that the MC value can evaluate the mechanical activity of the muscle, and clarify that the MC value indeed reflects the intensity of torque at different muscle lengths.