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Physical inactivity is a global public health concern. Systematic reviews indicate that interventions can increase short-term physical activity levels. However, long-term health benefits require sustained physical activity increases and systematic review evidence from interventions with objective measures of physical activity beyond 12 months is lacking. This review aimed to identify and describe randomised trials in adults with objective physical activity measures and follow-up beyond 12 months and evaluate the extent to which intervention effects are sustained beyond 12 months