| Research objectives:The physical condition of adolescents influences the physical health level of adults.Sensitivity and coordination are important components of physical fitness,which not only affect physical performance and physical health,but also affected by physical activity and exercise intervention.In the sensitive period of the development of physical quality,scientific sports intervention can effectively improve the sensitive quality and coordination quality.How to choose the mode of sports scientifically is a problem worth studying.Fitness hip-hop dance and cha-cha-cha dance belong to the whole body aerobic exercise,under the accompaniment of music,will be flexible movements,beautiful posture into the rhythm of the music,deeply loved by children and young people,however,it is not clear how these two dances affect the sensitivity and coordination of children and adolescents.The purpose of this study was to explore the effects of hip-hop dance and cha-cha-cha dance on the sensitivity and coordination of 9-10-year-old children.Research methods:In this paper,Delphi method methods,experimental methods,mathematical statistics and other research methods are used.The students aged 9-10 years old in three classes of grade 4 in Huayang Primary School of Guangzhou City were selected as experimental subjects and randomly divided into cha-cha dance group,fitness hip-hop dance group and routine course group,each group of 22 people(11 men and11 women)were taught 40 minutes twice a week for 9 weeks.Seven primary indicators,10 secondary indicators,and 10 test methods were finally determined by two rounds of expert questionnaire scores and expert recommendations through three screenings,in which sensitivity qualities included responsiveness,the ability of strain,speed and coordination included balance,perception,rhythm and coordination.The subjects were tested before and after the intervention.Research results:1.Responsiveness.Reaction Time.Compared with the pre-experiment,the time of catching and rebounding hexagonal ball in the two experimental groups was significantly shortened(p < 0.01),and there was no significant change in the control group(P > 0.05).After the experiment,the time of grasping and rebounding hexagonal ball in the two experimental groups was significantly shorter than that in the control group(p < 0.01),but there was no significant difference between the two experimental groups(P > 0.05).2.Resilience.(1)change of body position.Compared with the pre-experiment,the number of the two experimental groups increased significantly after the experiment(p < 0.01),no significant change in the control group(P > 0.05).After the experiment,the number of the girl students in the two experimental groups was significantly higher than that in the control group(p < 0.01),but there was no significant difference between the two experimental groups(P > 0.05),and there was no significant difference between the male students in each group(P > 0.05).(2)change of direction.Compared with the pre-experiment,the time of return running in both groups was significantly shortened(p < 0.01),and the time of return running in the control group was significantly increased(p < 0.01).After the experiment,the time of return running of the two experimental groups was significantly shorter than that of the control group(p < 0.01),and the time of return running of the male students in the fitness hip-hop dance group was significantly shorter than that of the control group(p < 0.05),but there was no significant difference between the other groups(P > 0.05).3.Speed capability.(1)speed.Compared with the pre-experiment,the number of change-direction rackets of both boys and girls increased significantly after the experiment(p < 0.01),and the number of change-direction rackets of girls in the control group also increased significantly(p < 0.01).After the experiment,the number of the change direction racket in the two experimental groups was significantly more than that in the control group(p < 0.01),but there was no significant difference between the two experimental groups(P > 0.05),and there was no significant difference between the female groups(P > 0.05).(2)displacement velocity.After the experiment,the hexagonal jumping time of the two experimental groups was significantly shorter than that before the experiment(p < 0.01),and the changing direction racket time of the control group was also significantly shorter than that before the experiment(p < 0.01).After the experiment,the hexagonal jumping time of the two experimental groups was significantly shorter than that of the control group(p < 0.01),but there was no significant difference between the two experimental groups(P > 0.05),and there was no significant difference between the male groups(P > 0.05).4.Ability to balance.Dynamic equilibrium.Compared with the pre-experiment,the straight walking time of heel lifting in both experimental groups was significantly shortened(p < 0.01),and that of the control group was significantly increased(p <0.01).After the experiment,the walking time of the two groups was significantly shorter than that of the control group(p < 0.01),but there was no significant difference between the two groups(P > 0.05).5.Perception.(1)accurate movement.Compared with the pre-experiment,the time of micro-hurdling in the two experimental groups was significantly shortened(p< 0.01),and the time of micro-hurdling in the control group was also significantly shortened(p < 0.01),in the control group,there was no significant difference(P >0.05).After the experiment,there was no significant difference among the three groups(P > 0.05).(2)orientation.Compared with the pre-experiment,the running time of Illinois was significantly shortened in both groups after the experiment(p <0.01),and the running time of Illinois was significantly shortened in the control group(p < 0.01),the running time of Illinois increased significantly in the control group(p < 0.01).After the experiment,the running time of the two experimental groups was significantly shorter than that of the control group(p < 0.01),but there was no significant difference between the two experimental groups(P > 0.05).There was no significant difference among the groups of boys(P > 0.05).6.Rhythm ability.Rhythm perception.Compared with before experiment,the time of lifting leg and dribbling was significantly shortened in both groups(p < 0.01),and there was no significant change in the control group(P > 0.05).After the experiment,the time of lifting leg and dribbling in the two experimental groups was significantly shorter than that in the control group(p < 0.01),but there was no significant difference between the two experimental groups(P > 0.05).7.Coordination ability.Coordination of upper and lower limbs.Compared with the pre-experiment,the number of cross-rope skipping in the two experimental groups increased significantly after the experiment(p < 0.01),but there was no significant change in the control group(P > 0.05).After the experiment,no matter boys or girls,the number of cross-rope skipping in the experimental group was significantly higher than that in the control group(p < 0.05),but there was no significant difference between the two experimental groups(P > 0.05).Research conclusions:(1)Cha-cha-cha and fitness hip-hop have improved the sensitivity of 9-10year-old students(mainly reflected in the ability to react),to the coordination quality has the promotion(mainly manifests in the balance ability,the rhythm ability and the coordination ability aspect).In addition,fitness hip-hop on the 9-10-year-old students to change direction has improved.(2)there were gender differences in the effects of hip-hop dance and cha-cha-cha dance on the sensitivity and coordination of 9-10-year-old students In the movement speed aspect,has the promotion effect to the male student. |
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