title: Correlates of cardiorespiratory and muscular fitness among Brazilian adolescents. CONSORT 2010 Explanation and Elaboration: Updated guidelines for reporting parallel group randomised trials. Adolescent determinants of cardiovascular risk factors in adult men and women Weight status, physical activity, and fitness among third-grade rural children. The association of physical activity and physical fitness with pre-adolescent obesity: an observational study in Metromanila, Philippines. Secular and longitudinal physical activity changes in population‐based samples of children and adolescents Cross sectional analysis of the association between mode of school transportation and physical fitness in children and adolescents High-intensity training increases spontaneous physical activity in children: a randomized controlled study. Regular participation in sports is associated with enhanced physical fitness and lower fat mass in prepubertal boys Associations between grip strength of parents and their 4-year-old children: findings from the Southampton Women's Survey. Effects of a daily school based physical activity intervention program on muscle development in prepubertal girls Relationships between physical activity, physical fitness, muscle strength and nutritional state in 5- to 11-year-old children Changes in physical activity are reflected in changes in fitness during late adolescence. A 2-year follow-up study. Association of sports club participation with fitness and fatness in children. Cross-sectional and prospective associations between sleep, screen time, active school travel, sports/exercise participation and physical activity in children and adolescents
abstract: OBJECTIVE To analyze socioeconomic indicators , physical activity ( PA ) opportunities , and behavioral correlates of cardiorespiratory and muscular fitness among Brazilian boys and girls . METHODS A sample of 1555 adolescents was r and omly selected . Age- and sex-specific st and ard scores were calculated for each fitness component . RESULTS Among boys , head of household 's schooling , involvement in organized PA , meeting the PA recommendations , and computer/games use were associated with cardiorespiratory fitness . Involvement in organized PA and active time in Physical Education ( PE ) classes were predictors of muscular fitness . Among girls , active time in PE classes and TV watching were predictors of cardiorespiratory fitness . Meeting the PA recommendations was associated with muscular fitness . CONCLUSION PA variables and sedentary behaviors should be independently considered for physical fitness promotion in youth Overwhelming evidence shows the quality of reporting of r and omised controlled trials ( RCTs ) is not optimal . Without transparent reporting , readers can not judge the reliability and validity of trial findings nor extract information for systematic review s. Recent method ological analyses indicate that inadequate reporting and design are associated with biased estimates of treatment effects . Such systematic error is seriously damaging to RCTs , which are considered the gold st and ard for evaluating interventions because of their ability to minimise or avoid bias . A group of scientists and editors developed the CONSORT ( Consoli date d St and ards of Reporting Trials ) statement to improve the quality of reporting of RCTs . It was first published in 1996 and up date d in 2001 . The statement consists of a checklist and flow diagram that authors can use for reporting an RCT . Many leading medical journals and major international editorial groups have endorsed the CONSORT statement . The statement facilitates critical appraisal and interpretation of RCTs . During the 2001 CONSORT revision , it became clear that explanation and elaboration of the principles underlying the CONSORT statement would help investigators and others to write or appraise trial reports . A CONSORT explanation and elaboration article was published in 2001 alongside the 2001 version of the CONSORT statement . After an expert meeting in January 2007 , the CONSORT statement has been further revised and is published as the CONSORT 2010 Statement . This up date improves the wording and clarity of the previous checklist and incorporates recommendations related to topics that have only recently received recognition , such as selective outcome reporting bias . This explanatory and elaboration document-intended to enhance the use , underst and ing , and dissemination of the CONSORT statement-has also been extensively revised . It presents the meaning and rationale for each new and up date d checklist item providing examples of good reporting and , where possible , references to relevant empirical studies . Several examples of flow diagrams are included . The CONSORT 2010 Statement , this revised explanatory and elaboration document , and the associated website ( www.consort-statement.org ) should be helpful re sources to improve reporting of r and omised trials Aims : To investigate how physical activity , physical performance and sociodemographic characteristics at the age of 16 are related to adult health habits ( physical activity , dietary intake , smoking ) and biological risk factors for cardiovascular diseases ( being overweight , low aerobic fitness , unfavorable levels of serum lipids , high blood pressure ) . Methods : A r and omly selected group of 220 male and 205 female students at 16 years of age was tested in 1974 , and reinvestigated 18 years later . Results : The predictive health profiles for adult lifestyle and biological risk factors were different in men and women . Leisure sports activity along with high performance in the nine-minute run among the boys and in the two-h and lift test among the girls were significant predictors of adult physical activity . A positive attitude to aerobic exercise  and high performance in the nine-minute run test among the boys and high marks in physical education among the girls decreased the risk of smoking .  Leisure sports activities together with body mass index at young ages were the most powerful predictors of adult biological risk factors , but attitudes to sports and educational level were also significant determinants . Conclusion : These results contribute to the knowledge of which factors at young ages may promote adult healthy habits in particular physical activities BACKGROUND Rural children are at a particular high risk for obesity . Given the importance of exercise in obesity and chronic disease prevention , this study evaluated the level and relationship between physical activity and fitness in a sample of rural third grade rs . The second purpose of the study was to determine potential differences in physical activity and fitness level by weight status in this sample . METHODS Twelve schools participating in a multidisciplinary research project were r and omly selected for the study . Body mass index-for-age percentile , the modified Self-administered Physical Activity Checklist  , and the FITNESSGRAM battery tests were utilized to determine children 's weight status , physical activity , and fitness level , respectively . RESULTS Thirty-eight percent of the 237 participating children ( 9.2 ± 0.4 years ) were overweight or obese . Nearly 15 % were extremely obese . Children spent 91.8 ± 83.8 and 32.2 ± 47.7 minutes in moderate- and vigorous-intensity activities . Obese children spent less time in moderate-intensity activity ( p < .01 ) and combined moderate- and vigorous-intensity activity more than other children ( p < .05 ) . Forty-three percent of all children failed to meet the fitness st and ard for muscular strength and 36 % failed to meet it for flexibility . CONCLUSIONS Rural children in this sample had higher rates of obesity compared to the national average ; they had poor fitness and 30 % failed to meet the minimum physical activity recommendations on the previous day . Future interventions should focus on increasing physical activity , especially of moderate-intensity , and improving physical fitness in order to reduce obesity and decrease the risk of future chronic diseases in this high-risk population BACKGROUND Childhood obesity has been inconsistently associated with decreased levels of physical activity and fitness . Moreover , little is known about this relationship among Filipino preteens . METHODS This cross sectional study reports the association between childhood obesity , measures of physical activity , and fitness .  Children aged 11 to 12 from r and omly selected schools from San Juan , Metromanila were included . Outcome measures were body mass index , Filipino modified Physical Activity Question naire for Older children ( F_PAQ-C ) ,  st and ing broad jump , 50 m sprint  and  20 m multistage shuttle run .  RESULTS 380 children participated in the study . Obese children had significantly lower median scores in the F_PAQ-C compared with overweight children . Overweight children had lower scores in the st and ing broad jump , 50 m sprints and predicted VO2max as compared with children with normal BMI . There were modest associations between the 50 m sprint , predicted VO2max , and F_PAQ-C. CONCLUSION Our study has showed that physical activity and fitness scores were strongly correlated with childhood obesity . If childhood physical fitness is a predictor of physical fitness in adulthood which is a risk factor in cardiovascular diseases , there is a strong possibility that the prevalence of cardiovascular disease in the Philippines will increase dramatically in the future The aims of this study were to investigate whether  physical activity ( PA ) and sedentary time ( ST )  in 9- and 15-year-olds differed between 2005 - 2006 and 2011 - 2012 ( secular change ) , and to investigate changes in PA and ST from age 9 to 15 ( longitudinal change ) . In 2005 - 2006 , we invited nationally representative sample s of Norwegian 9- ( n=1470 ) and 15-year-olds ( n=1348 ) to participate . In 2011 - 2012 , we invited a new nationally representative sample of 9-year-olds ( n=1945 ) , whereas 15-year-olds ( n=1759 ) were invited to participate either based on previous participation in 2005 - 2006 or from a r and om sample of schools . We assessed PA and ST objective ly using accelerometers . In 2011 - 2012 , both 9- and 15-year-olds spent more time sedentary ( ≥35.7 min/d , P<.001 ) and less time in light PA ( ≥35.2 min/d , P<.001 ) compared to their peers in 2005 - 2006 . Nine-year-old girls also spent less time in moderate-to-vigorous PA ( MVPA ) ( 4.2 min/d , P=.041 ) . In both age groups , the proportion accumulating an average of 60 min/d of MVPA did not differ between the two cohorts . From age 9 to 15 , girls and boys decreased their time spent in LPA ( ≥106.7 min/d , P<.001 ) and in MVPA ( ≥20.8 min/d , P<.001 ) . During the same period , ST increased by a mean of > 2 h/d ( P<.011 ) . We observed an adverse secular change in PA from 2005 - 2006 to 2011 - 2012 among 9- and 15-year-olds , and a large decline in PA in the participants followed longitudinally from age 9 to 15 years Objective To investigate the associations between body composition , cardiorespiratory and muscular fitness in relation to travel mode to school in children and adolescents . Method Children and adolescents from 40 elementary schools and 23 high schools representing all regions in Norway were invited to participate in the study . Anthropometry , cardiorespiratory and muscular fitness  were tested at the school location . Question naires were used in order to register mode of transport to school , age , gender and levels of leisure time physical activity . Results A total of 1694 ( i.e. 60 % of all invited participants ) children and adolescents at a mean age of 9.6 and 15.6 respectively ( SD = 0.4 for both groups ) were analyzed for associations with physical fitness variables . Males cycling to school had lower sum of skin folds than adolescents walking to school . Higher cardiorespiratory fitness in adolescents and male cyclists compared to walkers and passive commuters were observed . Among children , cycling and walking to school , higher isometric muscle endurance in the back extensors compared to passive commuters was observed . Conclusion Based on this national representative cross-sectional examination of r and omly selected children and adolescents there is evidence that active commuting , especially cycling , is associated with a favourable body composition and better cardiorespiratory and muscular fitness as compared to passive commuting OBJECTIVE To test the hypothesis that resistance training may increase spontaneous physical activity in children . STUDY DESIGN Two junior ice hockey teams were r and omly assigned to unchanged training schedules  ( team ZSC , 21 boys ; mean age , 13.2 years ) or to participate twice weekly in guided resistance training for 4 months ( team GCK , 25 boys ; mean age , 13.4 years ) . Spontaneous physical activity energy expenditure ( SpAEE ; 3-axial accelerometry for 7 days ) , muscle strength , and body composition ( dual energy x-ray absorptiometry ) were measured at 0 , 4 , and 12 months . RESULTS Baseline measures did not differ in the groups , except for higher leg and trunk strength in team ZSC . In the intervention group compared with the control group , SpAEE significantly ( P < or = .02 ) increased at 4 months ( + 25.5 % versus 0 % ) and 12 months ( + 13.5 % versus -9.5 % ) . Leg and arm strength increased because of training intervention ; all other variables were unchanged . None of these variables correlated with changes in SpAEE . CONCLUSION In boys who play ice hockey , spontaneous physical activity is inducible with resistance training ; this effect seems to be independent of changes in body composition and strength . If this was confirmed in unselected children , resistance training might be a new strategy for childhood obesity prevention programs OBJECTIVE : To study the effect of physical activity on whole body fat ( BF ) , its regional deposition and the influence of body fatness on physical performance in prepubertal children . DESSIGN : Cross-sectional study .SUBJECTS : A total of 114 boys ( 9.4±1.5 y , Tanner I – II ) , r and omly sample d from the population of Gran Canaria ( Spain ) , 63 of them physically active ( PA , at least 3 h per week during the previous year ) and 51 nonphysically active ( non-PA ) .  MEASUREMENTS : Body composition ( DXA ) , anthropometric variables ( body circumferences and skinfolds ) and physical fitness were determined in all subjects . RESULTS : The PA obtained better results in maximal oxygen uptake , isometric leg extension force , vertical jump ( muscular power ) , and 300 m ( anaerobic capacity ) and 30 m running tests ( speed ) than the non-PA . A lower percentage of body fat ( % BF ) ( 4 U less , P<0.05 ) , whole BF mass ( 36 % less , P<0.05 ) and regional fat mass ( 28 , 25 , and 30 % less in the trunk , legs and arms , respectively , all P<0.05 ) was observed in the PA compared to the non-PA . The waist and hip circumferences correlated more closely with both the fat mass accumulated in the trunk region and the % BF ( r=0.81–0.95 , P<0.001 ) than the waist-to-hip ratio ( WHR ) . The WHR correlated with the percentage of the whole fat mass accumulated in the trunk ( PFT ) ( r=0.52–0.53 , P<0.001 ) . In both groups , the PFT increased curvilinearly with the % BF , regardless of the level of physical activity . ANCOVA analysis revealed that total and regional fat masses explained less than 40 % of the difference in performance between the PA and non-PA group . The mean speed in the 30 m running test ( V30 ) , combined with the height and whole body mass , has predictive value for the BF mass ( R=0.98 , P<0.001 ) . The % BF may be estimated from the body mass index ( BMI ) and V30 ( % BF=8.09 + 2.44 · BMI ( kg m−2)–5.8·V30 ( m s−1 ) , R=0.94 , P<0.001 ) in prepubertal boys . CONCLUSIONS : Regular participation in at least 3 h per week of sports activities and competitions on top of the compulsory physical education program is associated with increased physical fitness , lower whole body and trunkal fat mass in prepubertal boys 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 This 12-month prospect i ve controlled intervention evaluated the effect of a general school based physical activity program on muscle strength , physical performance and body composition in prepubertal girls . Fifty-three girls aged 7–9 years involved in a school based exercise program [ 40 min/day of general physical activity per school day ( 200 min/week ) ] were compared with 50 age-matched girls who participated in the general Swedish physical education curriculum  ( mean 60 min/week ) . Body composition ( DXA ) , isokinetic peak torque ( PT ) of the knee extensors and flexors at 60 and 180 ° /s , and vertical jump height ( VJH ) were assessed at baseline and 12 months . The annual gain in weight was similar between the groups , but there was a greater increase in total body and regional lean mass ( P < 0.05 ) and fat mass ( P < 0.01 ) in the exercise group . Mean gains in knee extensor PT at 60 and 180 ° /s were 7.0–7.6 % greater in the exercise group ( P ranging < 0.05–<0.001 ) . No significant differences were detected in VJH . In conclusion , increasing school based physical education to at least 3 h/week provides a feasible strategy to enhance the development of muscle strength and lean mass in prepubertal girls Abstract The purpose of the present study was to assess different aspects of physical activity and fitness in order to develop a basis for sport programmes for overweight and obese children . Eighty-eight prepubertal children ( 49 boys , 39 girls , 4.8–11.4 years old , 61 % obese , 14 % overweight and 25 % normal weight ) were examined . Body composition was assessed by combined use of anthropometrics and bioelectrical impedance analysis . Resting energy expenditure ( REE ) and total energy expenditure ( TEE ) were measured by indirect calorimetry ( IC ) and individually calibrated 24-h heart rate ( HR ) monitoring , respectively . Activity-related energy expenditure ( AEE ) and physical activity level ( PAL )  were calculated from TEE and REE .  Fitness [ assessed by O2-pulse , respiratory exchange ratio ( RER ) at submaximal work intensities ] was determined by ergometry . The maximal isometric muscle strength of the legs ( m. quadriceps , Fa max , m. ischiocruralis , Fb max ) was measured by computer tensiometry .  Children were grouped according to their nutritional state , AEE , O2-pulse and muscle strength . When compared with normal weight children , obese and overweight children had increased fat mass ( FM ) , fat-free mass ( FFM ) , waist-to-hip ratio and REE , but no group differences were observed for TEE , AEE , and PAL . Obese and overweight children spent more hours per day watching TV  . After correction for body weight and FFM , no group differences in REE were observed , but normal weight children had a higher O2-pulse than overweight and obese children . By contrast , RER was increased in the latter group . The fittest group had the lowest body weight , BMI , FM and FFM . Children with a low O2-pulse spent more hours per day watching TV . Grouping children according to their degree of muscle strength , younger children ( 4–7.5 years ) did not show group differences in nutritional state , energy expenditure , physical activity and fitness . However , in the group of 7.6- to 11-year-old children , those with the greatest muscle strength and FFM had reduced BMI , skin folds , FM and FFM . FM correlated inversely with O2-pulse , but was not associated with TEE , AEE , PAL or muscle strength . By contrast TV consumption was positively associated with FM . To summarize , overweight and obese children were less fit and watched more TV than their normal weight counterparts . FM did not correspond to TEE , AEE or PAL . Muscle strength was not associated with FM in young children , but was inversely associated with FM in older children . Our cross-sectional data are consistent with the idea that increased fitness and reduced physical inactivity may prevent children from being overweight The study describe changes over 2 years in different physical fitness measures and the relationship between these changes and changes in physical activity . Maximal aerobic work capacity ( Wattmax ) , functional strength , muscle endurance , agility and flexibility were measured in 259 r and omly selected high school boys and girls 16.5 years of age and followed-up 2 years later , while they still attended school . Most physical fitness measures increased over time in boys , and in girls an increase was found in arm extensor strength and trunk extensor endurance , but Wattmax per kg body mass decreased . Changes in physical performance between 16 and 18 years of age seem to be very similar in different countries , despite differences in physical activity patterns and absolute level of performance . No change was found in time of participation in physical activity or sports activity  in either gender , but fewer girls participated in  leisure-time sports  at the 2nd test ( p < 0.001 ) . Change in physical activity or sports activity  did not relate to change in physical fitness level . The relationships between level of sports participation ( competition , for health or none ) and physical fitness measures at baseline and at the 2nd test were weak or non-significant . Three explanations for the weak relationship between physical activity and fitness are suggested : ( A ) part of the variability in fitness is explained by genetics , ( B ) growth and hormonal changes , especially in boys , override the stimulus of training , and ( C ) the physical fitness level in adolescents is so high that only physical activity at high relative intensity is supposed to have an effect on the fitness level UNLABELLED Decreased fitness and increased fatness are relevant factors for decreased cardiovascular and bone health in children . One way to increase physical activity and hence fitness and to reduce the risk for overweight might be sports club participation ( SCP ) . PURPOSE To investigate the association of SCP with fatness and fitness in children in general and in those with increased risk for overweight and /or low fitness . METHODS A cross-sectional study was conducted in a r and om sample of 502 first- and fifth- grade primary school children . Fitness components were determined by 10 motor tests and body fatness by the sum of four skinfolds . SCP was defined as participation of at least once a week . RESULTS Two thirds of all children were participating in a sports club . Girls ' and boys ' participation rate as well as those of overweight children and of children with overweight parents were comparable to their respective normal weight peers . In contrast , children from migrant families ( odds ratio = 0.31 ; 95 % confidence interval = 0.20 - 0.48 ) and from inactive parents ( odds ratio = 0.16 ; 95 % confidence interval = 0.05 - 0.45 ) participated significantly less ( all P < 0.001 ) . SCP was associated with endurance ( 0.53 > beta > 0.37 , all P < 0.05 ) and partly with speed , strength , and coordination ( 0.41 > beta > 0.18 , all P < 0.05 ) . In overweight children and in children from overweight parents and migrant families , this association was not found . There was no association between SCP and fatness in any of the groups . CONCLUSIONS SCP rates were high and were associated with higher levels of most fitness components in children . Participation rates were lower for children of migrant families and children from inactive parents . In addition , the association between SCP and fitness components was not found in overweight children and in children from overweight parents and migrant families Background The aim of this study was to investigate how sleep , screen time , active school travel and sport and /or exercise participation associates with moderate-to-vigorous physical activity ( MVPA ) in nationally representative sample s of Norwegian 9- and 15-y-olds , and whether these four behaviors at age nine predict change in MVPA from age nine to 15 years . Method We pooled cross-sectional accelerometer and question naire data  from 9- ( n = 2366 ) and 15-y-olds ( n = 1554 ) that participated in the first ( 2005/06 ) and second ( 2011/12 ) wave of the Physical Activity among Norwegian Children Study to investigate cross-sectional associations . To investigate prospect i ve associations , we used data from a sub- sample that participated in both waves ( at age nine and 15 years , n = 517 ) . Results Cross-sectional analyses indicated a modest , inverse association between screen time and MVPA among 9- ( − 2.2 min/d ( 95 % CI : -3.1 , − 1.3 ) ) and 15-y-olds ( − 1.7 min/d ( 95 % CI : -2.7 , − 0.8 ) ) . Compared to their peers with 0–5 min/d of active travel to school , 9- and 15-y-olds with ≥16 min/d accumulated 7.2 ( 95 % CI : 4.0 , 10.4 ) and 9.0 ( 95 % CI : 3.8 , 14.1 ) more min/d of MVPA , respectively . Nine-y-old boys and 15-y-olds reporting ≥8 h/week of sports and /or exercise participation accumulated 14.7 ( 95 % CI : 8.2 , 21.3 ) and 17.9 ( 95 % CI : 14.0 , 21.8 ) more min/d of MVPA , respectively , than those reporting ≤2 h/week . We found no cross-sectional association between sleep duration and MVPA in either age group . None of the four behaviors predicted change in MVPA from age nine to 15 years ( p ≥ 0.102 ) . Conclusion Active travel to school and sport/exercise participation may be important targets for future interventions aim ed at increasing MVPA in children and adolescents . However , future studies are needed to determine causality
target: 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: 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 .