A longitudinal analysis found different within-person associations, but it cannot show that physical activity or smartphone use caused changes in how adolescents rated their body shape.
A five-feature model based on exercise-test measurements showed high discrimination for both acute mountain sickness and symptom severity after rapid ascent. The result came from a retrospective cohort with internal testing, so it does not establish how well the tool would work in broader populations.
A study of university volleyball courses found three linked patterns: supportive teaching, mixed peer dynamics and campus conditions tied to activity beyond class.