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Effect of a Physical Activity Consultation in the Management of Adolescent Overweight (the PAC-MAnO project): study rationale, design and methods
  1. Antonio Videira-Silva1,
  2. Luís Sardinha2,
  3. Helena Fonseca3,4
  1. 1 Pediatric University Clinic, Faculty of Medicine, University of Lisbon, Lisbon, Portugal
  2. 2 Exercise and Health Laboratory, Faculty of Human Kinetics, University of Lisbon, Lisbon, Portugal
  3. 3 Pediatric Obesity Clinic, Department of Pediatrics, Hospital de Santa Maria, Lisbon, Portugal
  4. 4 Rheumatology Research Unit, Molecular Medicine Institute, Faculty of Medicine, University of Lisbon, Lisbon, Portugal
  1. Correspondence to Dr Antonio Videira-Silva; antonioascenso{at}


Background Adolescent overweight is a major public health concern, as it is associated with several short-run and long-run adverse health outcomes. Inappropriate health behaviours may be at the front of this epidemic. There is widespread need for new strategies that may positively influence dietary and physical activity behaviours. This trial (NCT02941770) was designed to investigate the impact of a physical activity consultation, based on motivational interview technique, on physical activity behaviour and weight status among overweight adolescents followed at a tertiary paediatric care centre.

Methods/Design This is an ongoing non-randomised controlled clinical trial with a 6-month duration and follow-up at month 12. It is expected to be concluded in December 2018. Adolescents (n=129) aged 12–18 with a body mass index ≥p85 are recruited and allocated into three groups: (1) control group: standard care (paediatric and nutrition consultations, n=43); (2) experimental group I: standard care plus physical activity consultation (n=43); and (3) experimental group II: exposure to two sessions/week of structured physical exercise, in addition to the standard care plus physical activity consultations (n=43). Sample size was calculated according to power analysis. Participants undergo a set of socioeconomic, anthropometric, body composition, clinical and behavioural (dietary and physical activity) assessments.

Discussion Adolescence is a critical period for the acquisition of a healthy lifestyle. The promotion of an active lifestyle may influence adolescents’ weight status and further prevent multiple comorbidities. The findings of our study will provide further understanding on the impact of a physical activity consultation on physical activity behaviour and weight reduction/maintenance among overweight adolescents.

Trial registration number NCT02941770.

  • adolescent health
  • obesity
  • physiology
  • exercise physiology

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  • Contributors All authors contributed to the conception and design of the present study. All authors contributed to the writing and review of the protocol manuscript, and approved its final version as submitted. All authors met the standard criteria for authorship.

  • Funding AVS is supported by the Portuguese Foundation for Science and Technology (SFRH/BD/130193/2017). This research did not receive any other specific grant from funding agencies in the public, commercial, or not-for-profit sectors.

  • Competing interests None declared.

  • Patient consent Obtained.

  • Ethics approval Research ethics committee of the Faculty of Medicine, University of Lisbon, Lisbon, Portugal (271/2016).

  • Provenance and peer review Not commissioned; externally peer reviewed.

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