Comfort Kneeling Seat for School-Age Children

Kneeling seat is an ergonomic chair that can help the human body’s spine in a sitting posture to be closer to the natural state. In this study, we used non-contact camera method to measure visual distance, using surface electromyography (sEMG) combined with subjective evaluation. We studied the obvious effects of seat angle and leg support angle in kneeling sitting posture on the ride comfort of healthy female school-age children without myopia. Using three experiment seat angles (10°,20° and 30°), we found that as the sitting angle increased, the absolute value of the slope of the erector spinae linearity curve, MPF- t , gradually decreased. At 30°, the slope of MPF- t was −0.26, the descent speed was the slowest, the activity of erector spinae was relatively lowest, and the comfort of children’s waist was also improved, while the comfort of calf gastrocnemius decreased, just the opposite. At the same time, leg support angles of 20°, 30° and 40° were used. And in the study we found that the elevation of the leg support angle had no significant effect on the erector spinae muscle, but had a significant effect on the gastrocnemius muscle. When the leg support angle was 30°, the slope of MPF- t was −0.42, and the gastrocnemius comfort reached its peak.