Toddler obesity prevention: A two-generation randomized attention-controlled trial

Rapid weight gain increases risks of obesity and associated co-morbidities. The objective was to reduce the rate of body mass index (BMI) growth (BMI z score), relative to control. Secondary outcomes were toddler-mother physical activity, mealtime interactions and fruit/vegetable intake. The randomized three-arm, eight-session, 4-month trial, conducted 2009-2013, included two intervention arms (responsive parenting and maternal lifestyle) and an attention control (home safety). Baseline and 6- and 12-month follow-up evaluations included weight and length/height, ankle accelerometry, video-recorded mealtime interactions (Emotional Availability Scales) and 24-h diet recalls (Healthy Eating Index-2015 [HEI-2015]). Analyses used linear mixed-effects models with repeated measures comparing intervention versus control changes in BMI z score. We recruited 277 racially mixed (70% African American) toddler-mother dyads (mean ages 20.1 months and 27.3 years) from US WIC and primary care clinics and randomized them into intervention versus control; 31% toddlers and 73% mothers were overweight/obese. At follow-up, changes in the rate of toddler BMI z score and maternal BMI were non-significant. Maternal lifestyle group toddlers and mothers spent 24.43 and 11.01 more minutes in physical activity (95% confidence interval [CI]: 2.55, 46.32, and 95% CI: 1.48, 20.54, respectively). Fruit intake increased in both intervention groups. Hostile mealtime interactions increased in the maternal lifestyle group, and in supplementary analyses, mealtime interactions were significantly higher in the responsive parenting group than in the maternal lifestyles group, suggesting that toddler dietary interventions include responsive parenting. Intervention effects were stronger among older versus younger toddlers. Despite no impact on weight gain, additional research should examine integrated two-generation responsive parenting and maternal lifestyle interventions among toddler-mother dyads.

Toddler physical activity study: laboratory and community studies to evaluate accelerometer validity and correlates

Background

Toddlerhood is an important age for physical activity (PA) promotion to prevent obesity and support a physically active lifestyle throughout childhood. Accurate assessment of PA is needed to determine trends/correlates of PA, time spent in sedentary, light, or moderate-vigorous PA (MVPA), and the effectiveness of PA promotion programs. Due to the limited availability of objective measures that have been validated and evaluated for feasibility in community studies, it is unclear which subgroups of toddlers are at the highest risk for inactivity. Using Actical ankle accelerometry, the objectives of this study are to develop valid thresholds, examine feasibility, and examine demographic/ anthropometric PA correlates of MVPA among toddlers from low-income families.

Methods

Two studies were conducted with toddlers (12–36 months). Laboratory Study (n = 24)- Two Actical accelerometers were placed on the ankle. PA was observed using the Child Activity Rating Scale (CARS, prescribed activities). Analyses included device equivalence reliability (correlation: activity counts of two Acticals), criterion-related validity (correlation: activity counts and CARS ratings), and sensitivity/specificity for thresholds. Community Study (n = 277, low-income mother-toddler dyads recruited)- An Actical was worn on the ankle for > 7 days (goal >5, 24-h days). Height/weight was measured. Mothers reported demographics. Analyses included frequencies (feasibility) and stepwise multiple linear regression (sMLR).

Results

Laboratory Study- Acticals demonstrated reliability (r = 0.980) and validity (r = 0.75). Thresholds demonstrated sensitivity (86 %) and specificity (88 %). Community Study- 86 % wore accelerometer, 69 % had valid data (mean = 5.2 days). Primary reasons for missing/invalid data: refusal (14 %) and wear-time ≤2 days (11 %). The MVPA threshold (>2200 cpm) yielded 54 min/day. In sMLR, MVPA was associated with age (older > younger, β = 32.8, p < 0.001), gender (boys > girls, β = −11.21, p = 0.032), maternal MVPA (β = 0.44, p = 0.002) and recruitment location (suburban > urban, β = 19.6, p < 0.001), or race (non-Black > Black, β = 18.5, p = 0.001). No association with toddler weight status.

Conclusions

Ankle accelerometry is a valid, reliable, and feasible method of assessing PA in community studies of toddlers from low-income families. Sub-populations of toddlers may be at increased risk for inactivity, including toddlers that are younger, female, Black, those with less active mothers, and those living in an urban location.

The perceived and built environment surrounding urban schools and physical activity among adolescent girls

BACKGROUND

Neighborhood perceived/built environment and physical activity (PA) associations have been examined for adolescents around homes, but not surrounding schools.

PURPOSE

The purpose of this paper is to examine if positive perceptions/built environment in neighborhoods surrounding schools predict PA among low-income, urban adolescent girls.

METHODS

Measures include: minutes in moderate-vigorous PA (MVPA, ankle accelerometry), perceptions of the school environment (questionnaire), built environment (neighborhood audit). Analyses include multi-level models.

RESULTS

Two hundred twenty-four sixth and seventh grade girls [mean(sd) age = 12.1(0.7) years] from 12 schools serving low-income, primarily African American communities; mean MVPA 35.4 min (mean days assessed = 5.8). Girls in schools with more positive perceptions of the neighborhood environment surrounding the school were less active (β = 7.2, p = 0.043). Having "places to go within walking distance" (perceptions) and number of food stores near school (built environment) positively relate to MVPA (β = 5.5, p = 0.042 and β = 0.59, p = 0.047).

CONCLUSIONS

Among neighborhoods surrounding urban schools, positive perceptions do not predict PA; accessibility, via both perceived and built environment, support PA.

Maternal perceptions of toddler body size: accuracy and satisfaction differ by toddler weight status

OBJECTIVES

To examine (1) accuracy of maternal perceptions of toddler body size; (2) factors associated with accuracy of toddler body size; and (3) how maternal satisfaction relates to accuracy/toddler body size.

DESIGN

Cross-sectional.

SETTING

Low-income community sample from suburban Special Supplemental Nutrition Program for Women, Infants, and Children (WIC)/urban pediatric clinics.

PARTICIPANTS

Two hundred eighty-one mother-toddler dyads (toddlers: 54.1% male; mean age, 20.2 months; 70.8% African American; 8.5% underweight [<15th weight-for-length percentile]; and 29.2% overweight [≥85th weight-for-length percentile]).

MAIN EXPOSURE

Measured anthropometry (mother/toddler) and demographics.

OUTCOME MEASURE

Validated toddler silhouette scale (accuracy and satisfaction).

RESULTS

Nearly 70% of mothers were inaccurate in assessing their toddler's body size. Compared with mothers of healthy-weight toddlers, mothers of underweight toddlers were 9.13 times more likely to be accurate (95% CI, 2.94-28.36) and mothers of overweight toddlers were 87% less likely to be accurate (95% CI, 0.05-0.33); accuracy did not differ by toddler age, sex, or race or mother's education or weight status. More than 70% of all mothers and 81.7% of mothers of overweight toddlers were satisfied with their toddler's body size. Accurate mothers of underweight toddlers were less likely to be satisfied than accurate mothers of healthy-weight toddlers (30.0% vs 76.8%; P < .001).

CONCLUSIONS

Mothers of overweight toddlers had inaccurate perceptions of their toddler's body size and were highly satisfied, suggesting a view of heavy toddlers as normative. Mothers of underweight toddlers had accurate perceptions yet were dissatisfied, suggesting recognition of their child as outside the norm. Because inaccurate perceptions begin early in toddlerhood, pediatric providers should help improve families' understanding of healthy body size. Future studies should examine how satisfaction and accuracy relate to parenting behaviors.