Abstract
<p class="p1">This study is aimed to find out the influence of training habits on the lower limb (hip, knee, ankle) kinematics of junior school girl students, and compare it with the parameter of adults to find out the characteristics of the lower limb kinematics in Juvenile stage, and more desired to explore the law about it to provide the basis for physical training in juvenile stage. Thirty junior school girl students age at 13 to 14 years old participated in this study, of which 15 participants have exercise habits and 15 participants without exercise habits. The Vicon kinematics analysis system (Oxford, Metrics, Ltd., Oxford, UK) with a shooting frequency of 200Hz was used to collect the three-dimensional kinematics of the hip, knee and ankle joint. The study found that the exercise group in step and pace were higher 7.1% and 6.4% respectively than non-exercise group, but in step frequency, 7.7% lower than non-exercise group. In terms of joint angle, compared with participants without exercise habits, participants with exercise habit showed decreased angle of ankle with dorsiflexion, increased angle of the ankle with plantarflexion, and significant peak angle of plantarflexion; meantime, exerted increased angle of eversion and decreased angle inversion which were more similar to the kinematics parameters of adult women. During the push-off period, there was an obvious increase in non-exercise group’s angle of ankle with eversion, which may be one of the reasons for the phenomenon of “outer eight feet” in the juvenile. The physical parameters of the participants with exercise were more approximated to the adults’, indicating that exercise habits have positive effects on the stability of joint, such as the joint force can be better controlled, improving the walking stability, and avoiding injury.
Highlights
Motor skills of some activities such as running, walking or jumping, are essential in most children’s physical activities
This study selected 30 healthy junior high school girl students as participants involved in the study, all participants were come from Tianxingeng middle school, and had no leg or foot disease in the past half year, the exercise group and non-exercise group both were 15
Junior students are in a critical period of body development and growth, their lower extremity kinematics has differences with adults
Summary
Motor skills of some activities such as running, walking or jumping, are essential in most children’s physical activities. Many children are participating in organized sport activities, such as endurance races, resulting in leg injuries increase (Krabak, Snitily, & Milani, 2016). In this context, variables such as rear foot eversion (Pohl, Hamill, & Davis, 2009) and misalignments in lower limbs (Barton, Levinger, Menz, & Webster, 2009) have been associated to running-related injury risk (Latorre Roman, Balboa, & Pinillos, 2017). For long term exercise students, there are considerable variations of gaits in space and time parameters and kinematics parameters. The long term exercise students’ maximum ground reaction force, the ground reaction force integral, ground reaction force time parameters were significantly higher than that of the non-exercise students, but the peak pressure and the
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