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Preschool age is an important time to master fundamental motor skills (FMS) through structured physical activity, yet many young children lag behind in motor skill development.
The Promoting Lifelong Activity in Youth (PLAY) study is a pilot comparative effectiveness trial to test the acceptability, feasibility, and preliminary effectiveness of a mobile app delivered to parents to promote FMS development in their preschool children (aged 3-5 years).
We conducted a 2-arm, parallel-design, randomized comparative effectiveness trial in 72 parent-child dyads from the southeastern United States. Experts in motor development and developmental psychology developed an app designed to deliver a 12-week program to parents of preschoolers using 1 of 2 curricula: an FMS program (intervention) that involved peer modeling, parent engagement, and structured skills-based activities and an unstructured physical activity (comparator) curriculum that provided suggestions for child-led physical activity (ie, free play). Primary outcomes are feasibility and acceptability of the app and child’s FMS measured at end of intervention (week 12). Exploratory outcomes are child’s objective physical activity, perceived movement competence, and parent report of self-regulation at the end of treatment (week 12) and sustained outcomes at follow-up (week 24).
This project was funded in September 2018, with institutional review board approval in August 2018. Data collection took place from May 2019 through February 2020. To date, the project team has completed data collection on 69 preschool-age children, and results are expected to be published by 2021.
The PLAY study examines the feasibility and preliminary effectiveness of a mobile app, parent-led curricula to promote FMS proficiency for preschool children. If found to be effective, the app has the potential for wide-scale dissemination to parents of preschoolers and to provide a model for the utilization of mobile apps to promote young children’s motor skill development.
ClinicalTrials.gov NCT03901300; https://clinicaltrials.gov/ct2/show/NCT03901300
DERR1-10.2196/19943
Physical activity (PA) is vital to early childhood physical and mental development [
FMS and PA behaviors have a dynamic and reciprocal relationship [
As children and their parents spend a significant amount of time viewing screens [
Comparable mobile health (mHealth) programs that focus on increasing PA in preschoolers are promising: A 6-month mobile app intervention delivered to parents of preschoolers improved children’s PA, particularly among those with higher fat mass [
The goal of PLAY is to test a developmentally appropriate intervention delivered on a mobile app to parents, with the goal of teaching FMS proficiency to their preschool-aged children (aged 3-5 years). The specific aims are described in the following sections.
The first aim is to examine the feasibility and acceptability of a 12-week FMS intervention delivered through a mobile app to parents and children.
The second aim is to test the hypothesis that a 12-week FMS intervention delivered through a mobile app will improve children’s FMS, compared to the unstructured PA (UPA) app comparator group.
The first exploratory aim is to test the hypothesis that a 12-week FMS intervention delivered through a mobile app will improve children’s PA levels, perceived movement competence, and academic readiness (ie, self-regulation skills), compared to the UPA app comparator group.
The second exploratory aim is to test the potential mediating or moderating effect of FMS on changes in exploratory outcomes.
The third exploratory aim is to test the hypothesis that the effects of the FMS intervention will be sustained through week 24.
The PLAY study was designed as an attention-matched randomized controlled trial, with the intervention arm receiving FMS instruction and the comparator arm receiving instruction on UPA. The PLAY study sought to recruit 72 child-parent dyads (children 3 to 5 years of age), with the goal of 36 dyads per arm. Parents were targeted to guide the intervention, as parental support, modeling, and co-participation predict children’s engagement in PA [
The estimated effect size is based on a meta-analysis of FMS interventions (overall effect size
Parents of preschool children in a southeastern state of the United States were recruited between May 2019 and August 2019. Parents were recruited using advertisements via local childcare centers, community events, email listserv, and social media. Inclusion criteria for the child were age between 3 and 5 years, physically capable of exercise, and no mobility limitations that would impair PA based on parent report. Child exclusionary criterion was gross motor quotient at “gifted” or “very advanced” based on the Test of Gross Motor Development - 3rd edition (TGMD-3) [
Dyads were randomized in a 1:1 ratio to the FMS or UPA condition after all baseline assessments were complete. The statistician (RB) generated a sex-stratified adaptive randomization taking into account baseline FMS. Investigators were blinded. Data assessors were blinded at each assessment visit. Families discovered which condition they were assigned to following the completion of baseline data collections.
After an initial phone screen, eligible preschool children and parents were asked to attend a screening visit. All study visits occurred at a local recreational facility or at the biomedical research center.
Parents received detailed information about the study and provided written informed consent. Eligibility measures were also completed. Parents completed a weekly availability worksheet to identify available times and opportunities to practice lessons with their children using the mobile app at least 5 days per week. The preschool child performed the TGMD-3. TGMD-3 assessments were scored by a trained coder before the baseline visit to determine eligibility. The child was fitted for a hip-worn accelerometer (ActiGraph GT3X+BT), and parents were asked to have their child wear the accelerometer for 24 hours/day for 7 days while the parent completed a wear-time log. The parent was present when the child was fitted for their accelerometer to assist in appropriate placement while at home; parents were also given informational handouts on how to complete the parental log and when and how to take the monitors off.
The baseline visit was scheduled within 2-3 weeks of the screening visit. Parents returned the accelerometer at the baseline visit. If the child did not have adequate accelerometer wear during the time period, the parent was asked to have the child wear the accelerometer for an additional 7 days. Parents completed questionnaires at the baseline visit, which included parent and child demographics and child self-regulation. A trained research assistant measured the child’s height and weight and conducted the Pictorial Scale of Perceived Movement Skill Competence for Young Children (PMSC) [
After the collection of baseline data, the trained research assistant revealed randomization from an opaque envelope provided by the statistician. The trained research assistant helped download the PLAY study mobile app onto the parent’s smartphone and selected the FMS version or UPA version based on randomization. The trained research assistant familiarized the parent with the PLAY study mobile app by using the first weekly lesson as an example, showing the videos and explaining the points system.
The parent and child returned for 2 follow-up visits at 12 weeks (end of intervention) and 24 weeks (follow-up) after baseline. The parent was mailed the accelerometer and wear-time log 2 weeks ahead of these visits to provide adequate time for the child to wear the accelerometer for 7 days. Parents returned the accelerometer in-person for each visit. At both follow-up visits, parents completed questionnaires including child self-regulation and acceptability. Anthropometry, PMSC, and TGMD-3 were conducted with the preschool child and in that specific order. A trained research assistant deleted the PLAY study mobile app from the parent’s smartphone at the week 24 visit.
The PLAY app was developed by research scientists with expertise in FMS, developmental psychology, and behavior change and programmed by CyberFision, an app development company. Because the app is web-based, the app can function on a smartphone, tablet, or other mobile internet-enabled device. Parents in both conditions downloaded the PLAY study mobile app. To standardize the appearance and usability of the mobile app across the two conditions, one mobile app was created to house all components of the intervention, with specific features turned on for each condition (ie, parents of the FMS intervention did not see the UPA intervention components and vice versa).
Parents in both conditions were instructed to first read the lesson each week, which detailed the purpose and goals for the activity breaks, and then to have their child perform the respective activity break (which was either the FMS or UPA suggested activities). Parents were asked to have their child engage in the activity breaks for at least 12 minutes/day, 5 days a week, for 12 weeks. This resulted in a total of 720 minutes of time directed toward either the FMS or UPA activity breaks. If the child was unable to obtain 12 minutes in one bout, the parent was asked to obtain that total amount within the day (eg, two 6-minute sessions).
One-way SMS or text messages were sent 5 times each week via the mobile app to prompt the parent to read each week’s lesson (1 time/week) and to prompt the parent and child to engage in the activity break (5 times/week). Parents selected times at their screening visit of when they wanted to receive these reminders. Additionally, a reinforcement schedule was built into the PLAY study mobile app by a point system in which the child pressed a star on the screen for each day that they performed the activity break (5 stars available for each week). Parents were encouraged to reward their child with non-food–based rewards such as small toys or non-tangible items such as a high-five. A new lesson was available every 7 days for 12 weeks for 12 lessons total. Lessons were unlocked regardless of the number of activity breaks completed; parents had access to previous lessons but were unable to access future lessons until the respective week. Research assistants also monitored parents’ usage of the app weekly by monitoring whether the parents reported that the child engaged in at least one activity break through the star reporting system. The research assistants telephoned the parent when this information was missing to inquire if there were technical difficulties accessing the app.
The PLAY app provided parents in the FMS condition with brief instructional lessons, peer modeling videos of FMS, and peer modeling videos of activity breaks to deliver targeted, structured FMS instruction time. The FMS condition was built on a curriculum focused on 6 key FMS (3 locomotor, 3 object control) that were selected to be challenging but developmentally appropriate (hop, throw, slide, kick, jump, catch; each repeated twice). Activity breaks were developed and tested previously in a preschool-age population, demonstrating effectiveness to improve children’s motor skill competence with good adherence [
For example, on Week 1 Day 1, the parent received a notification to open the app and access the first themed lesson, “Hop.” The parent was asked to read a brief instructional lesson about the targeted FMS (including a description of a proficient “hop”), view the brief videos of the demonstrated FMS and suggested activity break activities, and then engage in a 12-minute activity break designed to help the parent model the skill and provide the preschool child with practice for the targeted FMS. Given the complexity of each FMS, parents were given 5 videos of the subcomponents of completing each FMS and asked to practice the progression that fit the child. For example, for overhand throwing, the child would practice winding up, stepping forward with the opposite foot, following through across their body, and aiming either for distance or accuracy. Therefore, the child and parent had video examples of child peers completing these FMS subcomponents. The goal was to obtain a total exposure of 720 minutes of directed instruction over 12 weeks, a dosage that aligns with prior interventions that effectively improved children’s FMS [
Behavioral scaffolding [
Parents in the UPA (defined as child-led free play) condition had access to the UPA lessons and UPA activity breaks to promote the equivalent amount of UPA time for the child (ie, 720 minutes over 12 weeks). The lessons were adapted to be developmentally appropriate for preschool children using a curriculum previously developed and tested based on social cognitive theory [
PLAY app: features of each condition.
Features | Fundamental motor skills (FMS) | Unstructured physical activity (PA) |
Child physical activity | 720 minutes of directed instruction on FMS over 12 weeks (12 minutes/day, 5 days/week) | 720 minutes of unstructured PA over 12 weeks (12 minutes/day, 5 days/week) |
Parent lesson | Parent reads lesson once a week on each targeted FMS (eg, description of a proficient “hop”) | Parent reads lesson on PA support once a week (eg, how to make time for PA) |
Peer modeling videos | Parent and child watch video of peers modeling each targeted FMS (eg, a child performing a “hop”) | None |
Activity break | Practice, modeling, and reinforcement of each targeted FMS (eg, hopping game) | Activity breaks of unstructured PA (eg, take child to the park, play songs for a dance party) |
Push notifications | Once per week to notify of lesson availability; 5 times per week to prompt each 12-minute activity break | Once per week to notify of lesson availability; 5 times per week to prompt each 12-minute activity break |
Rewards and reinforcement | Point system reinforcement schedule | Point system reinforcement schedule |
Feasibility was measured as adherence to the mobile app intervention, including objective data on the number of lessons, videos, and activity breaks accessed, and self-reported frequency of interaction with the app through the reinforcement schedule (ie, star reporting system). These data were provided on an ongoing basis by CyberFision. Acceptability was captured at weeks 4, 8, and 12 with an in-app parent survey that assessed satisfaction with the intervention in 4 domains (overall satisfaction, helpfulness, ease of use, and perceived change in child’s motor skills) using a Likert-type scale. The System Usability Scale [
FMS were assessed using the TGMD-3, a direct observation assessment used with children aged 3-10 years [
To measure PA, the child was asked to wear an Actigraph GT3X+BT accelerometer for 7 days on the right hip, which has been previously validated in preschool children [
The PMSC [
Self-regulation skills were reported by the parent using the Devereux Early Childhood Assessment, 2nd Edition, which is a 38-item proxy report with good validity and reliability to measure self-regulation and behavioral concerns in children aged 3-5 years [
For anthropometry, height and weight were measured using a stadiometer and portable scale, respectively, without shoes, and recorded to the nearest 1.0 cm and 0.1 kg, respectively. A third measurement was taken if the 2 measurements differed by more than 0.5 units. BMI z-score was calculated [
To collect sociodemographic data, parents reported information on child and parent age, sex, race/ethnicity, parental education, family structure, childcare or away-from-home care, home environment [
Intent-to-treat analyses will be used to include all participants with baseline and at least one follow-up value. Additional analyses will be conducted per protocol based on intervention adherence. Final selection of covariates included in the models will be based on model fit statistics, such as AIC.
Initial results for feasibility, broken down separately for number of lessons and videos accessed, activity breaks accessed, and frequency of interaction, will be expressed using contingency tables. Rates, based on a generalized linear model with a Poisson distribution, will be used to both adjust for covariates and compare the 2 versions of the app (FMS vs UPA). Each of the 4 domains of acceptability will be treated independently and considered as a continuous response, analyzed with a linear model for covariate and app effects.
FMS results will be estimated using a linear mixed effect model with the baseline and follow-up scores at week 12 (end of intervention) and week 24 (end of study) as the outcome. This model will use random effects to account for the correlation in a participant over time. Results from the model will be reported as least square means, with
PA levels, perceived movement competence, and self-regulation will be analyzed similarly as for Aim 2. FMS will be tested as a potential mediator and moderator. Mediations will investigate how the covariates affect the relationship between the condition and each outcome variable (for the exploratory analyses, these include PA levels, perceived movement competence, and academic readiness or self-regulation). Mediation analyses will be applied using both structural mean models and principal stratification [
Sustained effects will be estimated using a similar linear mixed model as described in an earlier section. However, time will be considered a continuous covariate in order to estimate the rate of sustained effect. This allows the interaction of app and time to test for rate differences between the 2 apps on outcomes of interest through the follow-up at weeks 12 and 24 (separate models conducted for each dependent variable measured continuously over time: FMS, PA levels, perceived movement competence, and self-regulation).
This project was funded from September 2018 through 2021 by the Eunice Kennedy Shriver National Institute of Child Health and Human Development of the National Institutes of Health. Pennington Biomedical Research Center’s Institutional Review Board approved this study in August 2018. Recruitment occurred between May 2019 and August 2019. Accordingly, data collection happened from May 2019 through February 2020, including all baseline, week 12, and week 24 visits. To date, the project team has completed data collection on 69 parent-child dyads and is currently analyzing the primary and exploratory outcomes. Results of the current study are expected to be published in 2021.
PLAY is a parent-targeted, theoretically grounded, mobile-based intervention designed to teach parents how to model, support, and guide their preschool-aged children’s FMS competence. The scientific premise for the protocol is based on: (1) evidence showing that children must establish a minimal level of FMS proficiency to continue participating in PA opportunities as they age [
Unlike other interventions that are primarily in childcare settings [
The use of a mobile app to deliver the intervention offers the unique opportunity to distribute evidence-based content in a succinct and easily accessible manner to parents. This mode of delivery directly to the hands of the parent offers many advantages compared to receiving this instruction at in-person classes or health clinics, reducing barriers such as transportation, time commitment, and other family priorities [
One of the key strengths of using a mobile app is the opportunity for dissemination and implementation (ie, scaling up the intervention). The mobile app may be readily updated from parents’ feedback and thereby adapted in a timely manner. This adaptability allows the study to bypass challenges in dissemination and implementation commonly presented in school and health care interventions, such as structural and personnel limitations. For example, the PLAY study mobile app delivers lessons that require little to no equipment and provides lessons directly to the parent and child. These two components decrease the potential for organizational challenges, along with hiring and training personnel to implement the intervention. Additionally, mobile apps allow accessibility to families and individuals living in rural areas where access to appropriate curriculum and health-enhancing activities is limited. A FMS curriculum delivered on a smartphone app is an innovative and potentially acceptable way to create a social learning environment that can benefit young children and their parents from their homes.
There are potential limitations to the PLAY study. The parents were provided with videos that demonstrate each level of FMS progression divided into skill components and expected to determine their child’s ability and adjust the activities for their child’s current FMS level. An important consideration is that previous studies indicate parents do not provide a valid report of their child’s FMS [
One challenge is potential malfunction of the mobile app that can influence delivery and lesson implementation during the trial. The research study team conducted usability testing prior to use and also contacted parents with technical support if they did not engage with the mobile app (via reporting participation) at least once per week. This communication was intended to allow any mobile app errors to be found in real-time and quickly addressed. Another limitation is a concern in app research, which is differentiating between adherence to protocol (ie, completing the activity breaks) and engagement with the mobile app (ie, opening and utilizing the mobile app) [
Overall, parents and preschool children spend much of their time using screens, and this existing screen-time may provide an opportunity to deliver beneficial and developmentally appropriate content to enhance FMS proficiency in young children. The PLAY study examines the feasibility and preliminary effectiveness of a mobile app and parent-led curricula to promote FMS proficiency for preschool children. If found to be effective, the app has the potential for wide-scale dissemination to parents of preschoolers and to provide a model for the utilization of mobile apps to promote young children’s motor skill development.
fundamental motor skills
mobile health
physical activity
Promoting Lifelong Activity in Youth
Pictorial Scale of Perceived Movement Skill Competence for Young Children
Test of Gross Motor Development – 3rd edition
unstructured physical activity
We would like to thank the parents and children who participated in the study. This research was supported by the National Institutes of Health (grant numbers R21HD095035, P30DK072476, U54 GM104940, T32DK064584). The funders had no role in study design; collection, analysis, or interpretation of data; writing of the report; or decision to submit the article for publication.
None declared.