Four daily 2-minute bouts of vigorous physical activity during scheduled school breaks, integrated into the school schedule
Exercise Snacks
Exercise Snacks and Adolescent Smartphone Use
A six-month classroom-randomized trial tested four daily two-minute vigorous exercise bouts during school breaks in adolescents. The program was linked with lower problematic smartphone use and screen time, although some gains faded after supervision ended.
Study overview
- Study title
- Effectiveness of Exercise Snacks in Mitigating Adolescent Problematic Smartphone Use: A Four-Wave Cluster Randomized Controlled Trial.
- Study authors
- Linjing Li, Bo Peng, Jinde Liu, Di Tang, Ruisi Ma
- Population
- Adolescents in secondary-school classes
- Sample size
- 386
- Duration
- 6 months, with outcomes assessed at baseline and months 2, 4, and 6; 2-month unguided follow-up
- Comparator
- Wait-list control group maintaining standard routines
- Outcomes
- Problematic smartphone use severity, Daily screen time, Daily steps, Psychological measures
Intervention
Main findings
Compared with the control condition, the exercise-snack group had lower problematic smartphone use scores and daily screen time by month four, along with increased daily steps and improvements in several psychological measures. Some improvements attenuated during the unguided follow-up.
What this may mean in practice
Snacksmate's reading of the evidence — not a quotation from the original paper.
These findings suggest that brief, school-based vigorous activity breaks may help reduce problematic smartphone use and screen time in adolescents during a supervised six-month program. The partial loss of improvement after follow-up and the uncertain clinical importance mean the findings should be interpreted cautiously.
Limitations
Psychological mechanisms and the clinical importance of the observed changes require further investigation.
Original study
What can you take from this?
The notes above are Snacksmate’s reading of this study, not personal advice.