| Objective:This paper explores the rope skippers single three-rolling rope skipping and continuous three-rolling rope skipping movements,standardizes technical movements,and provides scientific theoretical basis for rope skippers bounce ability training and public fitness exercise,improves the development of rope skipping technology and avoids some sports injury risks.Method:In this study,18 rope skippers(9 men and 9 women)were selected as the research subjects.All the subjects included in the study have won the national rope skipping competition in the past two years.No sports injuries occurred in two years;physical health,foot no obvious deformity;with flat foot,joint fracture and dislocation history,congenital ankle deformity history is not selected,lower limb joint activity is normal and all right foot.The subjects were collected by three-dimensional motion capture system(VISUAL 3D)and force platform(KISTLER-3D).The sampling frequency was1200 Hz.The infrared camera was used to label the left and right iliac joints,anterior superior iliac spine,greater trochanter,medial and lateral condyles of the knee,lateral malleolus,medial malleolus,first toe joint and fifth toe joint.VISUAL 3D image analysis system reconstructs 3D coordinates for later data processing.Dynamic and kinematic data are synchronously collected,and the three-dimensional spatial coordinates and related motion parameters of the corresponding landmarks of the hip,knee and ankle are derived.After sorting out and calculating the derived kinematic data,the data are derived.SPSS26.0 was used for data analysis,the standard deviation and average value of each parameter index were calculated,and the original data were standardized and analyzed.Results:1)The ground reaction force(GRF)of left and right feet(0.58±0.09,0.72±0.16)of male athletes in the take-off stage of single tri-rolling rope was significantly higher than that of single tri-rolling rope(1.91±0.12,2.18±0.37)(P<0.05).The joint torque(N·m)of lower limbs(1.49±0.51,1.30±0.64)of male athletes in the hip joint was significantly higher than that of single tri-rolling rope(0.98±0.13,0.88±0.11)(P<0.05),while the knee joint and ankle joint showed the opposite difference.The joint torque of single tri-rolling knee joint(0.66±0.06,0.68±0.08)and ankle joint(0.84±0.09,0.93±0.13)was significantly lower than that of continuous tri-rolling rope(1.76±0.12,1.85±0.23,2.14 2.14±0.18,2.59±0.39)(P<0.05).The angular velocity(°/s)190.07±23.42 and angular acceleration(°/s~2)89.38±4.73 of continuous tri-sway during the flight phase were significantly higher than those of single tri-sway jump rope 160.76±16.32 and 59.52±9.08(P<0.05).The continuous tri-sway 2.30±0.41 of ground reaction force in the right foot of landing buffer phase was significantly higher than that of single tri-sway 1.57±0.25(P<0.05).It was found that the single tri-sway 2.02±0.47 of ankle torque was significantly higher than that of continuous tri-sway;2)The ground reaction force(GRF)of the left and right feet of female athletes in the single three-way jump rope was 0.58±0.04 and 0.64±0.06 at the take-off stage of pedaling,while the ground reaction force of the left and right feet in the continuous three-way jump rope was 1.71±0.24 and 1.86±0.33,respectively(P<0.05).The joint torque(N·m)of the lower limbs was 1.51±0.23 and 3.21±0.59 at the knee and ankle joints in the continuous three-way jump rope,respectively,which was significantly greater than 0.99±0.18 and 1.83±0.35 at the single three-way jump rope(P<0.05).The acceleration(°/s)of the continuous three-way jump rope was 189.31±21.50 and the angular acceleration(°/s~2)was 79.83±4.49,respectively,which was significantly greater than 0.99±0.18 and 1.83 and 1.83 and 1.83±0.35 at the single three-way(P<0.05),respectively.The ground reaction force of the right feet in the continuous three;3)The ground reaction force(GRF)of male athletes was 0.72±0.16,which was significantly higher than that of female athletes 0.64±0.06(P<0.05).The hip joint torque(N·m)of male athletes was 1.49±0.51,which was significantly higher than that of female athletes 0.45±0.02(P<0.05).However,the far mobilization of female ankle joint was 1.83±0.35,which was significantly higher than that of male athletes 0.93±0.13(P<0.05).The angular velocity(°/s)and angular acceleration(°/s~2)of male athletes were 179.34±28.84 and 69.14±4.41,which were significantly higher than that of female athletes 160.29±14.04 and 50.36±8.65(P<0.05).The lower limb joint torque of male athletes was 1.28±0.26 and 2.02±0.47.4)The ground reaction force(GRF)of 2.18±0.37 upper right foot of male athletes in the continuous three-way kick-off stage was significantly higher than that of 1.86±0.33of female athletes(P<0.05).In terms of joint torque(N·m),the joint torques of male hip and knee joints were 0.98±0.13 and 1.76±0.12,respectively,which were significantly higher than those of female athletes(0.58±0.03 and 1.36±0.13,respectively)(P<0.05).However,in the ankle joint,the female distal mobilization was3.21±0.59,which was significantly higher than that of male athletes(2.59±0.39,respectively)(P<0.05).In the flight stage,the joint angular velocity(°/s)and angular acceleration(°/s~2)of male lower limbs were 189.19±21.08 and 69.63±4.29,respectively,which were significantly higher than those of female athletes(170.21±15.42 and 50.27±8.44,respectively(P<0.05).In the landing buffer stage,the ground reaction force of male continuous three-way shaking was 2.75±0.51,which was significantly greater than that of female athletes 2.30±0.41(P<0.05).Conclusions:1)There are similar trends between male and female athletes in ground reaction force,joint angular velocity and joint torque.2)There are significant differences in ankle joint torque at landing buffer stage,and the continuous three-rolling is significantly higher than the single three-rolling rope,indicating that the ankle joint is more stressed in the continuous three-rolling,suggesting that effective protective measures are necessary in sports.3)Play the ankle pedal take-off stage stretching force to improve the height of the jump will have a positive impact,vertical jump athletes on their own ability and vertical jump height effectively grasp can more fully regulate the muscle to improve athletic performance.4)In the construction of training plan,it should be aimed at improving sports performance and minimizing the risk of sports injury,and it is appropriate to add strength training of muscles around the lower limb joints,especially the knee and ankle joints. |
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