Exploring the Feasibility and Effectiveness of a Childcare PhysicaL ActivitY (PLAY) Policy: Rationale and Protocol for a Pilot, Cluster-Randomized Controlled Trial
Abstract
:1. Background
Hypothesis
2. Methods
2.1. Study Design
2.2. Ethics Approval and Consent to Participate
2.3. Sample Size
2.4. Recruitment and Randomization
2.5. Participants
2.6. Development and Implementation of the Childcare PLAY Policy
2.7. Measures
2.8. Analysis
3. Discussion
Author Contributions
Funding
Acknowledgments
Conflicts of Interest
Abbreviations
Appendix A. Childcare PLAY Policy
- Encourage children to engage in higher intensity energetic play (i.e., activities that induce sweating and heavy breathing) often throughout the day with a goal of accumulating a minimum of 40 min each day. More is better.
- Expose children to a variety of indoor and outdoor physical activities, including both child-directed and teacher-facilitated active play daily.
- Outdoor time is offered for a minimum of 120 min each day, unless extreme weather (i.e., heat or cold alert) prevents it. When extreme weather occurs, the opportunity exists for children to engage in active play indoors.
- Short, frequent outdoor sessions are most conducive to higher intensity physical activity among children; therefore, short bouts (e.g., 15–30 min) of outdoor time are recommended often (e.g., 3–4 times a day).
- Unstructured (i.e., child-directed) free play is predominant during outdoor time. When activity levels decline, childcare practitioners encourage continued energetic play through structured activity, participation alongside children, and use of verbal prompts.
- Encourage children to develop physical literacy by practicing fundamental movement skills often throughout the day (e.g., running, skipping, hopping, or jumping).
- The appropriate use of screen-based technology is role modelled by childcare practitioners by avoiding it when children are present. Screen-based technology is not offered to children under 2 and is not recommended during childcare hours.
- Programming is designed to break up sustained sedentary time using indoor movement-based activities.
Appendix B. Semi-Structured Interview Guide
- Overall, what has been your overall experience with implementing the physical activity policy?
- How ‘feasible’ (i.e., convenient and easy) was this policy to implement?
- How receptive were staff to implementing this policy?
- Does anyone have anything else to add?
- What were the best parts of the policy?
- What made those parts/characteristics so beneficial?
- What are some examples of these?
- Tell me more about that.
- What characteristic(s) of the policy do you feel was/were most appropriate for increasing physical activity participation among the children in your care?
- What made it/them so appropriate?
- What are some examples?
- Who else experienced something similar? Who experienced something different/in contrast?
- How ‘effective’ would you consider this policy in increasing children’s physical activity levels during childcare hours?
- What characteristic(s) of the policy do you feel was/were least appropriate for increasing physical activity participation among the children in your care?
- What made it/them so inappropriate?
- What are some examples?
- Who else experienced something similar? Who experienced something different/in contrast?
- How do you think this aspect of the policy could be tweaked so that it is more appropriate for the childcare environment?
- What challenges did you experience when implementing the policy?
- Please expand.
- In what ways did this impact the implementation of the policy?
- How well did you implement the policy?
- What solutions did you undertake to deal with these challenges?
- Please expand.
- Tell me more about that.
- How much time and effort did these solutions require?
Appendix C. Program Evaluation Survey
SECTION 1: FEASIBILITY (i.e., ease of implementation) OF POLICY IMPLEMENTATION
Strongly Disagree | Neither Agree or Disagree | Strongly Agree | |||
a. When first approached to participate, I was very receptive to implementing the PLAY policy. | 1 | 2 | 3 | 4 | 5 |
b. I felt adequately prepared to implement the PLAY policy. | 1 | 2 | 3 | 4 | 5 |
c. The PLAY policy was easy to implement. | 1 | 2 | 3 | 4 | 5 |
d. It was not easy to encourage children to engage in physical activity frequently throughout the day. | 1 | 2 | 3 | 4 | 5 |
e. It was easy to encourage children to engage in higher intensity energetic play frequently throughout the day. | 1 | 2 | 3 | 4 | 5 |
f. It was easy to provide children with the opportunity to achieve a minimum of 40 minutes of higher intensity energetic play each day. | 1 | 2 | 3 | 4 | 5 |
g. It was not easy to expose children to a variety of indoor physical activities each day. | 1 | 2 | 3 | 4 | 5 |
h. It was easy to expose children to a variety of outdoor physical activities each day. | 1 | 2 | 3 | 4 | 5 |
i. It was easy to provide unstructured or child-directed free play each day. | 1 | 2 | 3 | 4 | 5 |
j. It was not easy to provide structured or teacher-facilitated active play each day. | 1 | 2 | 3 | 4 | 5 |
k. It was easy to offer a minimum of 120 minutes of outdoor time each day. | 1 | 2 | 3 | 4 | 5 |
l. It was easy to provide the opportunity for children to engage in active play indoors when outdoor play was not possible. | 1 | 2 | 3 | 4 | 5 |
m. It was not easy to provide shorter, more frequent outdoor play sessions. | 1 | 2 | 3 | 4 | 5 |
n. It was easy to encourage continued energetic play through structured or teacher-led activities. | 1 | 2 | 3 | 4 | 5 |
o. It was easy to encourage continued energetic play through teacher participation in physical activity. | 1 | 2 | 3 | 4 | 5 |
p. It was not easy to encourage continued energetic play using verbal prompts. | 1 | 2 | 3 | 4 | 5 |
q. It was easy to support children’s development of physical literacy through encouragement of fundamental movement skills (e.g., running, skipping, hopping, or jumping). | 1 | 2 | 3 | 4 | 5 |
r. It was easy to avoid using my own screen-based technology when the children were present. | 1 | 2 | 3 | 4 | 5 |
s. It was easy to avoid children’s exposure to screen-based technology during childcare hours. | 1 | 2 | 3 | 4 | 5 |
t. It was not easy to break up children’s sedentary time by providing indoor active play opportunities. | 1 | 2 | 3 | 4 | 5 |
SECTION 2: FUTURE IMPLEMENTATION
I Plan to Continue… | Not at All Likely | Somewhat Likely | Extremely Likely | ||
a. to encourage children to engage in physical activity frequently throughout the day. | 1 | 2 | 3 | 4 | 5 |
b. to encourage children to engage in higher intensity energetic play often throughout the day. | 1 | 2 | 3 | 4 | 5 |
c. to provide children with the opportunity to achieve a minimum of 40 minutes of higher intensity energetic play each day. | 1 | 2 | 3 | 4 | 5 |
d. to expose children to a variety of indoor physical activities each day. | 1 | 2 | 3 | 4 | 5 |
e. to expose children to a variety of outdoor physical activities each day. | 1 | 2 | 3 | 4 | 5 |
f. to provide unstructured or child-directed free play each day. | 1 | 2 | 3 | 4 | 5 |
g. to provide structured or teacher-facilitated active play each day. | 1 | 2 | 3 | 4 | 5 |
h. to offer a minimum of 120 minutes of outdoor time each day. | 1 | 2 | 3 | 4 | 5 |
i. to provide the opportunity for children to engage in active play indoors when outdoor play is not possible. | 1 | 2 | 3 | 4 | 5 |
j. to provide shorter, more frequent outdoor sessions. | 1 | 2 | 3 | 4 | 5 |
k. to encourage continued energetic play through structured or teacher-led activities. | 1 | 2 | 3 | 4 | 5 |
l. to encourage continued energetic play through teacher participation in physical activity. | 1 | 2 | 3 | 4 | 5 |
m. to encourage continued energetic play through verbal prompts. | 1 | 2 | 3 | 4 | 5 |
n. to support children’s development of physical literacy through the encouragement of fundamental movement skills (e.g., running, skipping, hopping, or jumping). | 1 | 2 | 3 | 4 | 5 |
o. to avoid my own use of screen-based technology when children are present. | 1 | 2 | 3 | 4 | 5 |
p. to avoid children’s exposure to screen-based technology during childcare hours. | 1 | 2 | 3 | 4 | 5 |
q. to break up children’s sedentary time by providing indoor active play opportunities. | 1 | 2 | 3 | 4 | 5 |
SECTION 3: COMMUNICATION
How Effective Was the Communication… | Not at all Effective | Somewhat Effective | Extremely Effective | ||
a. between the research team and your centre? | 1 | 2 | 3 | 4 | 5 |
b. between your director and the staff? | 1 | 2 | 3 | 4 | 5 |
c. between and among staff members? | 1 | 2 | 3 | 4 | 5 |
d. between staff and/or the director and parents? | 1 | 2 | 3 | 4 | 5 |
SECTION 4: GENERAL THOUGHTS ABOUT THE PLAY POLICY
- What did you like most about the PLAY policy?
- What part of the PLAY policy did you feel was most important?
- What challenges did you experience when implementing the PLAY policy?
- What solutions helped you to resolve these challenges?
- During the intervention period, were there any aspects of the policy that you modified? Please describe
- If you made modifications, were they successful?
- If you could modify the PLAY policy in any way, what would you change? Why?
- Did you observe any changes in the children’s moods, or behaviour when implementing the PLAY policy?
- What else do you want us to know about your experience with the PLAY policy?
References
- Timmons, B.W.; Leblanc, A.G.; Carson, V.; Gorber, S.C.; Dillman, C.; Janssen, I.; Kho, M.E.; Spence, J.C.; Stearns, J.A.; Tremblay, M.S. Systematic review of physical activity and health in the early years (aged 0–4 years). Appl. Physiol. Nutr. Metab. 2012, 37, 773–792. [Google Scholar] [CrossRef] [PubMed]
- Carson, V.; Lee, E.-Y.; Hewitt, L.; Jennings, C.; Hunter, S.; Kuzik, N.; Stearns, J.A.; Unrau, S.P.; Poitras, V.J.; Gray, C.; et al. Correction to: Systematic review of the relationships between physical activity and health indicators in the early years (0–4 years). BMC Public Health 2017, 17, 854. [Google Scholar] [CrossRef] [PubMed]
- Tremblay, M.S.; Chaput, J.-P.; Adamo, K.B.; Aubert, S.; Barnes, J.D.; Choquette, L.; Duggan, M.; Faulkner, G.; Goldfield, G.S.; Gray, C.E.; et al. Canadian 24-Hour Movement Guidelines for the Early Years (0–4 years): An Integration of Physical Activity, Sedentary Behaviour, and Sleep. BMC Public Health 2017, 17, 874. [Google Scholar] [CrossRef] [PubMed]
- Statistics Canada: Survey on Early Learning and Child Care Arrangements. Available online: https://www150.statcan.gc.ca/n1/daily-quotidien/190410/dq190410a-eng.htm (accessed on 8 September 2019).
- Vanderloo, L.M.; Tucker, P.; Johnson, A.M.; Van Zandvoort, M.M.; Burke, S.M.; Irwin, J.D. The Influence of Centre-Based Childcare on Preschoolers’ Physical Activity Levels: A Cross-Sectional Study. Int. J. Environ. Res. Public Health 2014, 11, 1794–1802. [Google Scholar] [CrossRef]
- Erinosho, T.; Hales, D.; Vaughn, A.; Mazzucca, S.; Ward, D.S. Impact of Policies on Physical Activity and Screen Time Practices in 50 Child-Care Centers in North Carolina. J. Phys. Act. Health 2016, 13, 59–66. [Google Scholar] [CrossRef]
- Kuzik, N.; Carson, V. The association between physical activity, sedentary behavior, sleep, and body mass index z-scores in different settings among toddlers and preschoolers. BMC Pediatr. 2016, 16, 100. [Google Scholar] [CrossRef]
- Reilly, J.J. Low levels of objectively measured physical activity in preschoolers in child care. Med. Sci. Sports Exerc. 2010, 42, 502–507. [Google Scholar] [CrossRef]
- Tucker, P.; Vanderloo, L.M.; Burke, S.M.; Irwin, J.D.; Johnson, A.M. Prevalence and Influences of Preschoolers’ Sedentary Behaviors in Early Learning Centers: A Cross-Sectional Study. BMC Pediatr. 2015, 15, 128. [Google Scholar] [CrossRef]
- Copeland, K.A.; Kendeigh, C.A.; Saelens, B.E.; Kalkwarf, H.J.; Sherman, S.N. Physical activity in child-care centers: Do teachers hold the key to the playground? Health Educ. Res. 2011, 27, 81–100. [Google Scholar] [CrossRef]
- Poitras, V.J.; Gray, C.E.; Janssen, X.; Aubert, S.; Carson, V.; Faulkner, G.; Goldfield, G.S.; Reilly, J.J.; Sampson, M.; Tremblay, M.S. Systematic review of the relationships between sedentary behaviour and health indicators in the early years (0–4 years). BMC Public Health 2017, 17 (Suppl. S5), 868. [Google Scholar] [CrossRef]
- Vanderloo, L.M. Screen-viewing among preschoolers in childcare: A systematic review. BMC Pediatr. 2014, 14, 205. [Google Scholar] [CrossRef] [PubMed]
- Bell, A.C.; Finch, M.; Wolfenden, L.; Fitzgerald, M.; Morgan, P.J.; Jones, J.; Freund, M.; Wiggers, J. Child physical activity levels and associations with modifiable characteristics in centre-based childcare. Aust. N. Z. J. Public Health 2015, 39, 232–236. [Google Scholar] [CrossRef] [PubMed]
- Bower, J.K.; Hales, D.P.; Tate, D.F.; Rubin, D.A.; Benjamin, S.E.; Ward, D.S. The Childcare Environment and Children’s Physical Activity. Am. J. Prev. Med. 2008, 34, 23–29. [Google Scholar] [CrossRef] [PubMed]
- Copeland, K.A.; Sherman, S.N.; Kendeigh, C.A.; Kalkwarf, H.J.; Saelens, B.E. Societal Values and Policies May Curtail Preschool Children’s Physical Activity in Child Care Centers. Pediatrics 2012, 129, 265–274. [Google Scholar] [CrossRef]
- Staiano, A.E.; Webster, E.K.; Allen, A.T.; Jarrell, A.R.; Martin, C.K. Screen-Time Policies and Practices in Early Care and Education Centers in Relationship to Child Physical Activity. Child. Obes. 2018, 14, 341–348. [Google Scholar] [CrossRef]
- Stephens, R.L.; Xu, Y.; Lesesne, C.A.; Dunn, L.; Kakietek, J.; Jernigan, J. Relationship Between Child Care Centers’ Compliance with Physical Activity Regulations and Children’s Physical Activity, New York City, 2010. Prev. Chronic Dis. 2014, 11, E179. [Google Scholar] [CrossRef]
- McWilliams, C.; Ball, S.C.; Benjamin, S.E.; Hales, D.; Vaughn, A.; Ward, D.S. Best-Practice Guidelines for Physical Activity at Child Care. Pediatrics 2009, 124, 1650–1659. [Google Scholar] [CrossRef]
- Tremblay, M.S.; Leblanc, A.G.; Carson, V.; Choquette, L.; Gorber, S.C.; Dillman, C.; Duggan, M.; Gordon, M.J.; Hicks, A.; Janssen, I.; et al. Canadian Physical Activity Guidelines for the Early Years (aged 0–4 years). Appl. Physiol. Nutr. Metab. 2012, 37, 345–356. [Google Scholar] [CrossRef]
- Coe, D.P. Means of Optimizing Physical Activity in the Preschool Environment. Am. J. Lifestyle Med. 2018. [Google Scholar] [CrossRef]
- Tandon, P.S.; Walters, K.M.; Igoe, B.M.; Payne, E.C.; Johnson, D.B. Physical Activity Practices, Policies and Environments in Washington State Child Care Settings: Results of a Statewide Survey. Matern. Child Health J. 2017, 21, 571–582. [Google Scholar] [CrossRef]
- Ott, E.; Vanderloo, L.M.; Tucker, P. Physical activity and screen-viewing policies in Canadian childcare centers. BMC Public Health 2019, 19, 1–12. [Google Scholar] [CrossRef] [PubMed]
- Vanderloo, L.M.; Tucker, P. Physical activity and sedentary behavior legislation in Canadian childcare facilities: An update. BMC Public Health 2018, 18, 1–12. [Google Scholar] [CrossRef] [PubMed]
- Ward, D.S.; Vaughn, A.; McWilliams, C.; Hales, D. Physical activity at child care settings: Review and research recommendations. Am. J. Lifestyle Med. 2009, 3, 474. [Google Scholar] [CrossRef]
- Alberta Government: Alberta Child Care Accreditation Standards. Available online: http://www.humanservices.alberta.ca/documents/accreditation-standards.pdf (accessed on 9 September 2019).
- Carson, V.; Clark, D.; Ogden, N.; Harber, V.; Kuzik, N. Short-Term Influence of Revised Provincial Accreditation Standards on Physical Activity, Sedentary Behavior, and Weight Status in Alberta, Canada Child Care Centers. Early Child. Educ. J. 2015, 43, 459–465. [Google Scholar] [CrossRef]
- Campbell, M.K.; Piaggio, G.; Elbourne, D.R.; Altman, D.G. Group for the C. Consort 2010 statement: Extension to cluster randomised trials. Br. Med. J. 2012, 345, 1–21. [Google Scholar] [CrossRef]
- Eldridge, S.M.; Chan, C.L.; Campbell, M.J.; Bond, C.M.; Hopewell, S.; Thabane, L.; Lancaster, G.A.; PAFS Consensus Group; Altman, D. CONSORT 2010 statement: Extension to randomised pilot and feasibility trials. Pilot Feasibility Stud. 2016, 2, 64. [Google Scholar] [CrossRef]
- Gordon, E.S.; Tucker, P.; Burke, S.M.; Carron, A.V. Effectiveness of Physical Activity Interventions for Preschoolers: A Meta-Analysis. Res. Q. Exerc. Sport 2013, 84, 287–294. [Google Scholar] [CrossRef]
- Pwr: Basic Functions for Power Analysis. Available online: https://cran.r-project.org/package=pwr (accessed on 8 September 2019).
- R Core Team. R: A Language and Environment for Statistical Computing. Available online: https://www.R-project.org/ (accessed on 8 September 2019).
- Truelove, S.; Bruijns, B.A.; Vanderloo, L.M.; O’Brien, K.T.; Johnson, A.M.; Tucker, P. Physical activity and sedentary time during childcare outdoor play sessions: A systematic review and meta-analysis. Prev. Med. 2018, 108, 74–85. [Google Scholar] [CrossRef]
- Razak, L.A.; Yoong, S.L.; Wiggers, J.; Morgan, P.J.; Jones, J.; Finch, M.; Sutherland, R.; Lecathelnais, C.; Gillham, K.; Clinton-McHarg, T.; et al. Impact of scheduling multiple outdoor free-play periods in childcare on child moderate-to-vigorous physical activity: A cluster randomised trial. Int. J. Behav. Nutr. Phys. Act. 2018, 15, 34. [Google Scholar] [CrossRef]
- Cliff, D.P.; Reilly, J.J.; Okely, A.D. Methodological considerations in using accelerometers to assess habitual physical activity in children aged 0–5 years. J. Sci. Med. Sport 2009, 12, 557–567. [Google Scholar] [CrossRef]
- Oliver, M.; Schofield, G.M.; Kolt, G.S. Physical activity in preschoolers: Understanding prevalence and measurement issues. Sports Med. 2007, 37, 1045–1070. [Google Scholar] [CrossRef] [PubMed]
- Esliger, D.W.; Tremblay, M.S. Physical activity and inactivity profiling: The next generation. Can. J. Public Health 2007, 98, s195–s207. [Google Scholar] [PubMed]
- Pate, R.R.; Almeida, M.J.; McIver, K.L.; Pfeiffer, K.A.; Dowda, M. Validation and Calibration of an Accelerometer in Preschool Children. Obesity 2006, 14, 2000–2006. [Google Scholar] [CrossRef] [PubMed]
- Bandura, A. Self-Efficacy: The Exercise of Control; W. H. Freeman: New York, NY, USA, 1997. [Google Scholar]
- Ward, D.S.; Mazzucca, S.; McWilliams, C.; Hales, D. Use of the Environment and Policy Evaluation and Observation as a Self-Report Instrument (EPAO-SR) to measure nutrition and physical activity environments in child care settings: Validity and reliability evidence. Int. J. Behav. Nutr. Phys. Act. 2015, 12, 124. [Google Scholar] [CrossRef] [PubMed] [Green Version]
- Bates, D.; Machler, M.; Bolker, B.M.; Walker, S.C. Fitting linear mixed-effects models using Ime4. J. Stat. Softw. 2015, 67, 1–51. [Google Scholar] [CrossRef]
- Kuznetsova, A.; Brockhoff, P.B.; Christensen, R.H.B. lmerTest Package: Tests in Linear Mixed Effects Models. J. Stat. Softw. 2017, 82, 1–26. [Google Scholar] [CrossRef] [Green Version]
- Patton, M.Q. Qualitative Research & Evaluation Tools, 4th ed.; Sage Publications: Los Angeles, CA, USA, 2015. [Google Scholar]
- Psych: Procedures for Personality and Psychological Research. Available online: https://cran.r-project.org/package=psych (accessed on 8 September 2018).
- Rizopoulos, D. ltm: An R Package for Latent Variable Modeling and Item Response Theory Analyses. J. Stat. Softw. 2006, 17, 1–25. [Google Scholar] [CrossRef] [Green Version]
- Cardon, G.; Cauwenberghe, E.V.; Labarque, V.; Haerens, L.; De Bourdeaudhuij, I. The contribution of preschool playground factors in explaining children’s physical activity during recess. Int. J. Behav. Nutr. Phys. Act. 2008, 5, 1–6. [Google Scholar] [CrossRef] [Green Version]
- Copeland, K.A.; Khoury, J.C.; Kalkwarf, H.J. Child care center characteristics associated with preschoolers’ physical activity. Am. J. Prev. Med. 2016, 50, 470–479. [Google Scholar] [CrossRef] [Green Version]
- Pate, R.R.; Pfeiffer, K.A.; Trost, S.G.; Ziegler, P.; Dowda, M. Physical Activity among Children Attending Preschools. Pediatrics 2004, 114, 1258–1263. [Google Scholar] [CrossRef] [Green Version]
- Canadian Society for Exercise Physiology. Canadian 24-hr Movement Guidelines for the Early Years (0–4 years). November 2017. Available online: http://csepguidelines.ca/early-years-0-4/ (accessed on 8 September 2019).
Participant | Inclusion Criteria | Exclusion Criteria |
---|---|---|
Childcare Centres |
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Childcare Providers |
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Toddler/ Preschool Participants |
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|
Participant/Tool | Control Condition | Experimental Condition | |||||||
---|---|---|---|---|---|---|---|---|---|
Baseline (week 0) | Mid-Int (week 4) | Post-Int (week 9) | 6M | Baseline (week 0) | Mid-Int (week 4) | Post-Int (week 9) | 6M | ||
Toddlers/ Preschoolers | Parent/Guardian Demographic Q | x | x | ||||||
Physical Activity/ Sedentary Time (ActiGraph™ data) | x | x | x | x | x | x | x | x | |
Anthropometrics | x | x | |||||||
Childcare Providers | Demographic Q | x | x | ||||||
Policy Adherence Log (week 1–8) * | x | x | |||||||
Program Evaluation Survey | x | ||||||||
Interview | x | ||||||||
EPAO-SR General | x | x | x | x | x | x | x | x | |
EPAO-SR Today | x | x | x | x | x | x | x | x | |
Self-Efficacy Q | x | x | x | x | x | x | x | x | |
Directors | Director General EPAO-SR | x | x |
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Share and Cite
Tucker, P.; Driediger, M.; Vanderloo, L.M.; Burke, S.M.; Irwin, J.D.; Johnson, A.M.; Shelley, J.; Timmons, B.W. Exploring the Feasibility and Effectiveness of a Childcare PhysicaL ActivitY (PLAY) Policy: Rationale and Protocol for a Pilot, Cluster-Randomized Controlled Trial. Int. J. Environ. Res. Public Health 2019, 16, 4400. https://doi.org/10.3390/ijerph16224400
Tucker P, Driediger M, Vanderloo LM, Burke SM, Irwin JD, Johnson AM, Shelley J, Timmons BW. Exploring the Feasibility and Effectiveness of a Childcare PhysicaL ActivitY (PLAY) Policy: Rationale and Protocol for a Pilot, Cluster-Randomized Controlled Trial. International Journal of Environmental Research and Public Health. 2019; 16(22):4400. https://doi.org/10.3390/ijerph16224400
Chicago/Turabian StyleTucker, Patricia, Molly Driediger, Leigh M. Vanderloo, Shauna M. Burke, Jennifer D. Irwin, Andrew M. Johnson, Jacob Shelley, and Brian W. Timmons. 2019. "Exploring the Feasibility and Effectiveness of a Childcare PhysicaL ActivitY (PLAY) Policy: Rationale and Protocol for a Pilot, Cluster-Randomized Controlled Trial" International Journal of Environmental Research and Public Health 16, no. 22: 4400. https://doi.org/10.3390/ijerph16224400
APA StyleTucker, P., Driediger, M., Vanderloo, L. M., Burke, S. M., Irwin, J. D., Johnson, A. M., Shelley, J., & Timmons, B. W. (2019). Exploring the Feasibility and Effectiveness of a Childcare PhysicaL ActivitY (PLAY) Policy: Rationale and Protocol for a Pilot, Cluster-Randomized Controlled Trial. International Journal of Environmental Research and Public Health, 16(22), 4400. https://doi.org/10.3390/ijerph16224400