This paper is in the following e-collection/theme issue:

Web-based and Mobile Health Interventions 

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Works citing "Effects of a Web-Based Intervention on Physical Activity and Metabolism in Older Adults: Randomized Controlled Trial"

Carolien A Wijsman, Rudi GJ Westendorp, Evert ALM Verhagen, Michael Catt, P Eline Slagboom, Anton JM de Craen, Karen Broekhuizen, Willem van Mechelen, Diana van Heemst, Frans van der Ouderaa, Simon P Mooijaart
J Med Internet Res 2013 (Nov 06); 15(11):e233 

According to Crossref, the following articles are citing this article (DOI 10.2196/jmir.2843):

(note that this is only a small subset of citations)

1. Devi R, Powell J, Singh S. A Web-Based Program Improves Physical Activity Outcomes in a Primary Care Angina Population: Randomized Controlled Trial. Journal of Medical Internet Research 2014;16(9):e186 [CrossRef]
2. Westerterp KR. Reliable assessment of physical activity in disease. Current Opinion in Clinical Nutrition and Metabolic Care 2014;17(5):401 [CrossRef]