Results There was consistent evidence for a positive association between MF and physical activity .
For both MF components , there was support for objective ly measured physical activity , particularly for activity of vigorous intensity .
Sports participation was also consistently linked with both MF components , whereas the association with active transport was inconsistent .
For both MF components , associations with sedentary behaviors were inconsistent irrespective of measurement method , and the association between MF and sleep was considered uncertain .
Conclusions The available evidence supports a link between MF and physical activity , particularly for vigorous intensity activity and organized sports participation .
Background Muscular fitness ( MF ) is considered a powerful marker of health , but the extent to which common health behaviors are associated with MF during childhood and adolescence is currently unclear .
Objective We conducted a systematic review of studies investigating associations between MF ( i.e. , strength/power , local muscular endurance ) and physical activity , sedentary behaviors , and sleep in children and adolescents .
Associations between grip strength of parents and their 4-year-old children: findings from the Southampton Women's Survey.
Relationships between birthweight and grip strength throughout the life course suggest that early influences on the growth and development of muscle are important for long-term muscle function . However , little is known about parental influences on children 's grip strength . We have explored this in the Southampton Women 's Survey , a prospect i ve general population cohort study from before conception through childhood .  Grip strength  was measured using a Jamar h and grip dynamometer in the mother at 19 weeks ' gestation and her partner , and in the child at age 4 years . Pre-pregnancy  heights and weights were measured in the mothers ; reported weights and measured heights were available for the fathers . Complete data on parents and children were available for 444 trios . In univariable analyses , both parents '  grip strengths were significantly associated with that of the child ( r = 0.17 , P < 0.001 for mothers ; r = 0.15 , P = 0.002 for fathers ) . These correlations were similar to that between the grip strength of the mothers and the fathers ( r = 0.17 , P < 0.001 ) . In the multivariable model , after adjustment for child 's height and physical activity , the correlations with the child 's grip strength were attenuated , being 0.10 ( P = 0.02 ) and 0.11 ( P = 0.01 ) for mothers ' and fathers ' grip strength respectively . The findings show that grip strength of each parent is associated with that of the child , indicating that heritable influences and the shared family environment influence the development of muscle strength . This contributes to our underst and ing of the role of heritable and environmental factors on early muscle growth and development , which are important for muscle function across the life course
Results There was consistent evidence for a positive association between MF and physical activity .
For both MF components , there was support for objective ly measured physical activity , particularly for activity of vigorous intensity .
Sports participation was also consistently linked with both MF components , whereas the association with active transport was inconsistent .
For both MF components , associations with sedentary behaviors were inconsistent irrespective of measurement method , and the association between MF and sleep was considered uncertain .
Conclusions The available evidence supports a link between MF and physical activity , particularly for vigorous intensity activity and organized sports participation .
Background Muscular fitness ( MF ) is considered a powerful marker of health , but the extent to which common health behaviors are associated with MF during childhood and adolescence is currently unclear .
Objective We conducted a systematic review of studies investigating associations between MF ( i.e. , strength/power , local muscular endurance ) and physical activity , sedentary behaviors , and sleep in children and adolescents .