Associations between objective ly measured total sedentary time and indicators of adiposity and motor development were predominantly null .
Associations between screen time and indicators of adiposity , motor or cognitive development , and psychosocial health were primarily unfavourable or null .
Associations between time spent seated ( e.g. , in car seats or strollers ) or in the supine position , and indicators of adiposity and motor development , were primarily unfavourable or null .
Conclusions These findings continue to support the importance of minimizing screen time for disease prevention and health promotion in the early years , but also highlight the potential cognitive benefits of interactive non-screen-based sedentary behaviours such as reading and storytelling .
Background The purpose of this systematic review was to examine the relationships between  sedentary behaviour ( SB ) and health indicators in children aged 0 to 4 years , and to determine what doses of SB ( i.e. , duration , patterns [ frequency , interruptions ] , and type ) were associated with health indicators .
Prospective associations between early childhood television exposure and academic, psychosocial, and physical well-being by middle childhood.
OBJECTIVE To estimate the influence of  early childhood television exposure  on fourth- grade academic , psychosocial , and lifestyle characteristics . DESIGN Prospect i ve longitudinal study . SETTING Institut de la Statistique du Québec , Québec , Canada . PARTICIPANTS A total of 1314 ( of 2120 ) children . Main Exposure Parent-reported data on weekly hours of television exposure  at 29 and 53 months of age . We conducted a series of ordinary least-squares regressions in which children 's academic , psychosocial , and lifestyle characteristics are linearly regressed on early and preschool television exposure . OUTCOME MEASURES Parent and teacher reports of academic , psychosocial , and health behaviors and body mass index measurements ( calculated as weight in kilograms divided by height in meters squared ) at 10 years of age . RESULTS Adjusting for preexisting individual and family factors , every additional hour of television exposure at 29 months corresponded to 7 % and 6 % unit decreases in classroom engagement ( 95 % confidence interval [ CI ] , -0.02 to -0.004 ) and math achievement ( 95 % CI , -0.03 to 0.01 ) , respectively ; 10 % unit increases in victimization by classmates ( 95 % CI , 0.01 to 0.05 ) ; 13 % unit decreases in time spent doing weekend physical activity ( 95 % CI , 0.81 to 2.25 ) ; 9 % unit decreases in activities involving physical effort ( 95 % CI , -0.04 to 0.00 ) ; higher consumption scores for soft drinks and snacks by 9 % and 10 % ( 95 % CI , 0.00 to 0.04 and 95 % CI , 0.00 to 0.02 ) , respectively ; and 5 % unit increases in body mass index ( 95 % CI , 0.01 to 0.05 ) . Preschool increments in exposure also made a unique contribution to developmental risk . CONCLUSIONS The long-term risks associated with higher levels of early exposure may chart developmental pathways toward unhealthy dispositions in adolescence . A population -level underst and ing of such risks remains essential for promoting child development
Associations between objective ly measured total sedentary time and indicators of adiposity and motor development were predominantly null .
Associations between screen time and indicators of adiposity , motor or cognitive development , and psychosocial health were primarily unfavourable or null .
Associations between time spent seated ( e.g. , in car seats or strollers ) or in the supine position , and indicators of adiposity and motor development , were primarily unfavourable or null .
Conclusions These findings continue to support the importance of minimizing screen time for disease prevention and health promotion in the early years , but also highlight the potential cognitive benefits of interactive non-screen-based sedentary behaviours such as reading and storytelling .
Background The purpose of this systematic review was to examine the relationships between  sedentary behaviour ( SB ) and health indicators in children aged 0 to 4 years , and to determine what doses of SB ( i.e. , duration , patterns [ frequency , interruptions ] , and type ) were associated with health indicators .