http://www.ncbi.nlm.nih.gov/pmc/articles/PMC3056436/http://www.academia.edu/5260180/PREVALENCE_AND_PATTERN_OF_COGNITIVE_DYSFUNCTION_IN_TYPE_2_DIABETES_MELLITUS_JuniorResident_JuniorResidenthttp://www.plosone.org/article/info%3Adoi%2F10.1371%2Fjournal.pone.0084365http://www.cdc.gov/physicalactivity/everyone/measuring/heartrate.htmlhttp://www.cdc.gov/physicalactivity/everyone/measuring/index.htmlhttp://www.cdc.gov/physicalactivity/everyone/measuring/exertion.html