title: Should we reframe how we think about physical activity and sedentary behaviour measurement? Validity and reliability reconsidered.
abstract: BACKGROUND
  The measurement of physical activity (PA) and sedentary behaviour (SB) is fundamental to health related research, policy, and practice but there are well known challenges to these measurements. Within the academic literature, the terms "validity" and "reliability" are frequently used when discussing PA and SB measurement to reassure the reader that they can trust the evidence.
  
  
  CONCLUSIONS
  In this paper we argue that a lack of consensus about the best way to define, assess, or utilize the concepts of validity and reliability has led to inconsistencies and confusion within the PA and SB evidence base. Where possible we propose theoretical examples and solutions. Moreover we present an overarching framework (The Edinburgh Framework) which we believe will provide a process or pathway to help researchers and practitioners consider validity and reliability in a standardized way.
  
  
  CONCLUSIONS
  Further work is required to identify all necessary and available solutions and generate consensus in our field to develop the Edinburgh Framework into a useful practical resource. We envisage that ultimately the proposed framework will benefit research, practice, policy, and teaching. We welcome critique, rebuttal, comment, and discussion on all ideas presented.
authors.affiliation: Physical Activity for Health Research Centre, Institute for Sport, Physical Education and Health Sciences, University of Edinburgh, Edinburgh, UK. p.kelly@ed.ac.uk.
authors.forename: Paul
authors.initials: P
authors.lastname: Kelly
authors.affiliation: Physical Activity for Health Research Centre, Institute for Sport, Physical Education and Health Sciences, University of Edinburgh, Edinburgh, UK. claire.fitzsimons@ed.ac.uk.
authors.forename: Claire
authors.initials: C
authors.lastname: Fitzsimons
authors.affiliation: Physical Activity for Health Research Centre, Institute for Sport, Physical Education and Health Sciences, University of Edinburgh, Edinburgh, UK. graham.baker@ed.ac.uk.
authors.forename: Graham
authors.initials: G
authors.lastname: Baker
mesh_terms: D015444:Exercise; D006801:Humans; D009043:Motor Activity; D015203:Reproducibility of Results; D012106:Research; D012107:Research Design; D057185:Sedentary Behavior