title: Australia and Other Nations Are Failing to Meet Sedentary Behaviour Guidelines for Children: Implications and a Way Forward.
abstract: BACKGROUND
  Australia has joined a growing number of nations that have evaluated the physical activity and sedentary behavior status of their children. Australia received a "D minus" in the first Active Healthy Kids Australia Physical Activity Report Card.
  
  
  METHODS
  An expert subgroup of the Australian Report Card Research Working Group iteratively reviewed available evidence to answer 3 questions: (a) What are the main sedentary behaviors of children? (b) What are the potential mechanisms for sedentary behavior to impact child health and development? and (c) What are the effects of different types of sedentary behaviors on child health and development?
  
  
  RESULTS
  Neither sedentary time nor screen time is a homogeneous activity likely to result in homogenous effects. There are several mechanisms by which various sedentary behaviors may positively or negatively affect cardiometabolic, neuromusculoskeletal, and psychosocial health, though the strength of evidence varies. National surveillance systems and mechanistic, longitudinal, and experimental studies are needed for Australia and other nations to improve their grade.
  
  
  CONCLUSIONS
  Despite limitations, available evidence is sufficiently convincing that the total exposure and pattern of exposure to sedentary behaviors are critical to the healthy growth, development, and wellbeing of children. Nations therefore need strategies to address these common behaviors.
authors.affiliation: School of Physiotherapy, Curtin University, Perth, WA, Australia.
authors.forename: Leon
authors.initials: L
authors.lastname: Straker
authors.forename: Erin Kaye
authors.initials: EK
authors.lastname: Howie
authors.forename: Dylan Paul
authors.initials: DP
authors.lastname: Cliff
authors.forename: Melanie T
authors.initials: MT
authors.lastname: Davern
authors.forename: Lina
authors.initials: L
authors.lastname: Engelen
authors.forename: Sjaan R
authors.initials: SR
authors.lastname: Gomersall
authors.forename: Jenny
authors.initials: J
authors.lastname: Ziviani
authors.forename: Natasha K
authors.initials: NK
authors.lastname: Schranz
authors.forename: Tim
authors.initials: T
authors.lastname: Olds
authors.forename: Grant Ryan
authors.initials: GR
authors.lastname: Tomkinson
mesh_terms: D001315:Australia; D002648:Child; D015444:Exercise; D005260:Female; D019983:Guideline Adherence; D017408:Guidelines as Topic; D006293:Health Promotion / Q000458:organization & administration; D006801:Humans; D008297:Male; D009043:Motor Activity; D057185:Sedentary Behavior