No impact of patient and intervention characteristics on the effect estimates were found .
Short conclusion Low quality of evidence was found for a moderate effect of physical activity monitor-based interventions on physical activity compared with control interventions .
Background The body of evidence related to the effect of physical activity monitor-based interventions has grown over the recent years .
However , the effect of physical activity monitor-based interventions in older adults remains unclear and should be systematic ally review ed .
Objective The objective of this systematic review was to estimate the effect of physical activity monitor-based interventions on physical activity behavior  in participants aged 65 and above .
Subsequently we explored the effect on body mass index , physical capacity , and health-related quality of life and finally the impact of patient- and intervention characteristics .
Efficacy of an Individually Tailored, Internet-Mediated Physical Activity Intervention in Older Adults: A Randomized Controlled Trial
Objective : This study determined the effectiveness of an individually tailored , Internet-mediated physical activity ( PA ) intervention for increasing walking behavior in inactive older adults . Method : This 12-week r and omly controlled intervention divided participants ( N = 170 ) into three groups :  control ( CON , n = 51 ) ,  pedometer only ( PED , n = 62 ) , and an individually tailored , Internet-mediated pedometer ( TI-PED , n = 57 ) group . The PED group was instructed to increase weekly step count by 10 % until 10,000 steps per day was achieved . The TI-PED group was given the same goal and received tailored feedback via an online platform . Changes in average step count pre-to-post were assessed . Results : Total retention rate at postintervention was 75.3 % . PED ( p < .001 ) and TI-PED ( p < .001 ) increased step count pre-to-post , which was higher than the CON group at 12 weeks ( PED , p < .001 ; TI-PED , p < .001 ) . The TI-PED group had a higher step count at 12 weeks than the PED group ( p < .001 ) . Discussion : Individually tailored , Internet-mediated PA interventions are an effective way to significantly increase PA in older adults
No impact of patient and intervention characteristics on the effect estimates were found .
Short conclusion Low quality of evidence was found for a moderate effect of physical activity monitor-based interventions on physical activity compared with control interventions .
Background The body of evidence related to the effect of physical activity monitor-based interventions has grown over the recent years .
However , the effect of physical activity monitor-based interventions in older adults remains unclear and should be systematic ally review ed .
Objective The objective of this systematic review was to estimate the effect of physical activity monitor-based interventions on physical activity behavior  in participants aged 65 and above .
Subsequently we explored the effect on body mass index , physical capacity , and health-related quality of life and finally the impact of patient- and intervention characteristics .