“…The interventions were predominantly delivered by health or social care professionals ( n = 11) [ 8 , 9 , 26 , 30 , 34 , 40 , 46 – 50 , 53 ], trained lay volunteers ( n = 5) [ 39 , 54 , 56 , 57 , 60 ] and research team members with a lack of qualification description [ 10 , 21 , 22 , 25 , 29 , 31 , 33 , 35 – 38 , 41 , 45 ]. In the Carandang et al [ 43 ] study, the intervention involved the older adults themselves participating in a volunteer activity (assist in behaviour change and engaging with community) whereas Borbon-Castro et al [ 42 ] involved Higher Education students in physical activity and sport discipline. In the remaining studies, there were no information about who delivered the intervention [ 7 , 27 , 28 , 32 , 44 , 51 , 52 , 58 ].…”