(1.School of Physical Education,Shanghai University of Sport,Shanghai 200438,China; 2.School of Physical Education and Health,Zhejiang Normal University,Jinhua 321004,China) Abstract: To explore the relationships between 24-hour movement behaviors and Fundamental Motor Skills (FMS) using compositional data analyses among children, and the "dose-effect" characteristics of the reallocation between them. A cross-sectional study was conducted on 327 primary school students aged 6~10 years old in Jinhua. Accelerometer and Test of Gross Motor Development-3 (TGMD-3) were used to measure time spent in 24-hour movement behaviors and FMS, respectively. Compositional data analyses were used to analyze the relationship of FMS with the reallocation of time spent 24-hour activity. Results show that: (1) After controlling the sex, age and BMI, time spent on moderate-to-vigorous physical activity (MVPA) (β= 4.155, P <0.01) was positively associated with FMS, while the time spent on sedentary behavior (SED) (β=-6.926, P<0.01) was negatively associated with FMS in children. Sleep duration (P>0.05) and light-intensity physical activity (LPA) (P > 0.05) were not significantly associated with FMS. (2) The reallocation of time from other behaviors (LPA, SED, sleep) to MVPA can significantly improve FMS. On the contrary, the reallocation from MVPA to other behaviors (LPA, SED, sleep) can significantly reduce FMS. The associations between the reallocation between MVPA and other activities were asymmetrical. The reallocation from SED to sleep improve FMS significantly. The reallocation from SED to MVPA had the best promoting effect on FMS. (3) The proportion of sleep duration and the reallocation between sleep duration and MVPA were positively correlated with object control skills, but not with locomotion skills. At the same time, the influence of MVPA and other behaviors on object control skills is higher than that of locomotion skill. Conclusion will be that: Schools and parents should pay attention to the effect of children's 24-hour activities. Reallocating SED to MVPA or sleep, and reallocating LPA to MVPA will improve the FMS. More attention should be paid to the intervention of 24-hour activities on children's object control skills. Keywords: physical activity;sedentary behavior;sleep;fundamental motor skills;compositional data analysis; children |