| Objective: To obtain the basic biomechanical characteristics of the lower limbs of young people in the process of ascending six floors by continuous stair by comparing the difference of biomechanical parameters of the lower limbs of young people in the process of ascending six floors by continuous stair.To explore and reveal the biomechanical characteristics and laws of young people’s continuous climbing stairs,and to provide a theoretical basis for further related research.Methods: This research through the acquisition of 10 healthy young men in the process of continuous six stories on the floors of biomechanical data,application SPSS26.0software on each floor of the lower limb biomechanical data of single factor analysis of variance and homogeneous inspection,meet again after the LSD multiple later inspection,revealed in the process of continuous six stories on lower limb biomechanical characteristics of the floors.Results:(1)There were significant differences in hip Angle between the fifth and sixth layers of the left foot at the moment of following the ground,the moment of the left foot resting and the moment of the left heel landing again(P <0.05).There were significant differences in the knee joint Angle between the fourth and fifth layers when the left foot followed the ground and when the left sole was put down and the left heel touched the ground again(P<0.05).There were significant differences in the Angle of ankle joint between the left foot in the fourth,fifth and sixth floor,the moment of left heel off the ground and the moment of left toe off the ground(P <0.05).(2)There were significant differences in the EMG of biceps femoris,lateral peroneus muscle and rectus femoris muscle at the fifth and sixth layers(P <0.05),and there were significant differences in the EMG of medial peroneus muscle,anterior tibia muscle and medial vastus muscle at the sixth layer(P <0.05).The RMS of the biceps femoris muscle,the lateral peroneal muscle,the medial peroneal muscle,the lateral vastus muscle,the rectus femoris muscle and the medial vastus muscle in the fourth,fifth and sixth layers had significant differences(P <0.05),and the RMS of the tibialis anterior muscle in the fifth and sixth layers had significant differences(P <0.05).The average power frequency of rectus femoris muscle,tibialis anterior muscle and vastus medialis muscle were significantly different between the 5th and 6th layers(P<0.05).(3)The plantar pressure,maximum peak pressure and impulse of the first metatarsal bone,the fourth metatarsal bone,the fifth metatarsal bone and the lateral area of the arch were significantly different between the fifth and sixth layers(P <0.05).The contact area of the inner part of the arch had significant difference in the sixth layer(P <0.05),and the contact area of the outer part of the arch had significant difference in the fifth and sixth layers(P <0.05).Conclusion :(1)The sagittal Angle of hip joint,knee joint and ankle joint increased with the increase of floor,so that the center of gravity of human body gradually moved forward,the pressure of knee joint gradually increased and the balance ability of human body gradually decreased;(2)the lower limb muscles will enter the fatigue state when going up the stairs for more than four layers continuously,so that the Angle of the knee joint and ankle joint will be increased to increase the muscle strength to maintain the movement of going up the stairs continuously,and at the same time,the pressure of the first metatarsal region will be increased;(3)The center of mass of the human body will gradually move forward when the staircase goes up for more than three floors,so that the plantar pressure value,impulse and plantar pressure center track are concentrated to the first metatarsal bone,and the muscle force of the front leg is compensated to increase and maintain the trend of forward tilt. |
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