4Kiecolt G,,Janice K,Glaser R.Stress and immunity:Age enhances the risks. Current Directions in Autoimmunity . 2001
5A Steptoe,J Wardle,M Marmot.Positive affect and health-related neuroendocrine, cardiovascular, and inflammatory processes. Proceedings of the National Academy of Sciences of the United States of America . 2005
7STEPTOE A,DOCKRAY S,WARDLE J.Positive affect and psychobiological processes relevant to health. J Pers . 2009
8BL Fredrickson.The broaden-and-build theory of positive emotions. Philosophical Transactions of the Royal Society of London (Biological Sciences) . 2004
9ST Charles,CA Reynolds,M Gatz.Age-related differences and change in positive and negative affect over 23?years. Journal of Personality . 2001
10Aichberger, M. C., Busch, M. A., Reischies, F. M., StrOhle, A,, Heinz, A., & Rapp, M. A. (2010). Effect of physical inactivity on cognitive performance after 2.5 years of follow-up: Longitudinal results from the survey of health, ageing, and retirement (SHARE). GeroPsych: The Journal of Gerontopsychology and Geriatric Psychiatry, 23(1), 7-15.