• Steve Iliffe, Denise Kendrick, Richard Morris, Dawn Skelton, Heather Gage, Susie Dinan, Zoe Stevens, Mirilee Pearl, and Tahir Masud.
• Department of Primary Care & Population Health, University College London, Rowland Hill St, London NW3 2PF, UK. s.iliffe@pcps.ucl.ac.uk
• Trials. 2010 Jan 1;11:6.

BackgroundRegular physical activity reduces the risk of mortality from all causes, with a powerful beneficial effect on risk of falls and hip fractures. However, physical activity levels are low in the older population and previous studies have demonstrated only modest, short-term improvements in activity levels with intervention.Design/MethodsPragmatic 3 arm parallel design cluster controlled trial of class-based exercise (FAME), home-based exercise (OEP) and usual care amongst older people (aged 65 years and over) in primary care. The primary outcome is the achievement of recommended physical activity targets 12 months after cessation of intervention. Secondary outcomes include functional assessments, predictors of exercise adherence, the incidence of falls, fear of falling, quality of life and continuation of physical activity after intervention, over a two-year follow up. An economic evaluation including participant and NHS costs will be embedded in the clinical trial.DiscussionThe ProAct65 trial will explore and evaluate the potential for increasing physical activity among older people recruited through general practice. The trial will be conducted in a relatively unselected population, and will address problems of selective recruitment, potentially low retention rates, variable quality of interventions and falls risk.Trial RegistrationTrial Registration: ISRCTN43453770.

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