The relative decline in MVPA affects both sexes from an early age ; however , it is greater among girls .
Moderate-to-vigorous-intensity  physical activity ( MVPA )  is important for childhood obesity prevention and treatment , yet declines with age .
Timing and magnitude of the decline in MVPA in children and adolescents are unclear but important for informing effective obesity intervention development .
This systematic review aim ed to determine and compare the year-to-year changes in MVPA among children and adolescents .
Longitudinal associations of fundamental movement skills with objectively measured physical activity and sedentariness during school transition from primary to lower secondary school.
OBJECTIVES This study aim ed to investigate cross-lagged associations of leaping skill and throwing-catching skills with objective ly measured moderate-to-vigorous physical activity ( MVPA ) and sedentary time ( ST ) during school transition from upper primary ( Grade 6 ) to lower secondary school ( Grade 7 ) . DESIGN This study is a one-year prospect i ve follow-up study within Finnish school setting s. Students '  MVPA , ST , leaping skill and throwing-catching skills were measured at Grade 6 and subsequently at Grade 7 . METHODS A sample of 336 students ( 163 girls , 173 boys ; M age=12.0 years , SD=0.4 at Grade 6 participated in the study . Students '  MVPA and ST  were measured objective ly by hip-worn accelerometers .  Leaping skill  was measured by 5-leaps test .  Throwing and catching skills were measured by throwing-catching combination test . Cross-lagged structural equation modeling was conducted to evaluate the associations between MVPA , ST , leaping skill , and throwing-catching skills at Grade 6 and Grade 7 . RESULTS Results demonstrated three significant cross-lagged associations among girls : ( 1 ) leaping skill measured at Grade 6 was negatively associated with ST at Grade 7 ; ( 2 ) objective ly measured MVPA at Grade 6 associated positively with leaping skill at Grade 7 ; and ( 3 ) throwing-catching skills measured at Grade 6 associated positively with leaping skill measured at Grade 7 . There were no statistically significant cross-lagged associations between the study variables for the sample of boys . CONCLUSIONS The results of this study indicated that supporting opportunities for girls ' engagement in both MVPA and leaping skill development activities during their primary school education is strongly recommended
The relative decline in MVPA affects both sexes from an early age ; however , it is greater among girls .
Moderate-to-vigorous-intensity  physical activity ( MVPA )  is important for childhood obesity prevention and treatment , yet declines with age .
Timing and magnitude of the decline in MVPA in children and adolescents are unclear but important for informing effective obesity intervention development .
This systematic review aim ed to determine and compare the year-to-year changes in MVPA among children and adolescents .