Protocol for a randomized controlled dose response trial to combat accelerated summer BMI gain in children: The Determining the Optimal amount of Structured Environments (DOSE) study.

Background: Summer is a period of accelerated body mass index (BMI) gain for elementary school-aged children. Summer day camps may provide a structured environment, which has been shown to mitigate accelerated summer BMI gain. Many of these programs have a fee-for-service structure, creating a financial barrier for families with low-income.