PMID: 9167890May 1, 1997Paper

Differences over the life span in daily life-style regularity

Chronobiology International
T H MonkP R Houck

Abstract

A diary-based instrument-the Social Rhythm Metric (SRM)-was used to assess the level of stability of daily social and behavioral rhythms in a group of 239 healthy subjects (112 male, 127 female) ranging in age from 20 to 89 years. Each subject completed the instrument for two consecutive weeks, which were averaged to yield one measure (SRM score) of life-style regularity [range 0 (least regular) to 7 (most regular)] and another of activity level index (ALI), corresponding to the number of (diary listed) activities done per week (max. = 119). SRM score increased reliably with age group at an average rate of 0.018 units per year. ALI showed an "inverted U"-shaped function with a maximum at about 50 years. SRM changes appeared not to be related to demographic differences between the age groups, although ALI differences may have been so related. No main effects or interactions were found with gender. Life-style regularity appears to increase over the life span in response to both biological and psychosocial changes and may represent an adaptation to age-related changes in the circadian system's sensitivity to entraining agents. Regular behavioral rhythms may be conducive to continued good health and well-being.

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Citations

May 12, 2001·Journal of the American Geriatrics Society·M M OhayonR G Priest
Aug 2, 2011·Experimental Aging Research·Shevaun D NeupertJason C Allaire
Sep 13, 2005·Journal of Circadian Rhythms·Shawn D YoungstedtKatharine M Rex
Mar 4, 2014·PloS One·Daniel AustinJeffrey Kaye
Mar 7, 2012·Chronobiology International·Jeanne Sophie MartinLuc Laberge
Jul 16, 2008·Chronobiology International·Tania Fernandes CamposMarina Tostes Miranda Barroso
Apr 10, 2013·The American Journal of Geriatric Psychiatry : Official Journal of the American Association for Geriatric Psychiatry·Ritsaert LieverseWitte J G Hoogendijk
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Oct 31, 2006·Physiology & Behavior·Dietmar Weinert, Jim Waterhouse
Sep 2, 2015·Behavioral Sleep Medicine·Caitlan A TigheChristina S McCrae
Jun 3, 2004·Journal of Psychosomatic Research·Maurice M Ohayon
Dec 12, 2013·The Journals of Gerontology. Series B, Psychological Sciences and Social Sciences·Natalie D DautovichChristina S McCrae
Jun 29, 2011·Journal of Affective Disorders·Ben BullockGreg Murray
Jan 29, 2010·Journal of Psychosomatic Research·Seog Ju KimSeong-Jin Cho
May 16, 2014·The Journals of Gerontology. Series B, Psychological Sciences and Social Sciences·Haley R DillonAndrew J Bush
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Sep 11, 2002·Journal of Sleep Research·Timothy H MonkDavid J Kupfer
Sep 24, 2004·Bipolar Disorders·Colin A Depp, Dilip V Jeste
Mar 11, 1998·Journal of Sleep Research·J CarrierD J Kupfer
Aug 31, 2004·Chronobiology International·Timothy H MonkDavid J Kupfer
Jun 7, 2000·Chronobiology International·T H Monk, D J Kupfer
Apr 17, 2010·Sleep·Anna ZisbergTamar Shochat
Mar 18, 2003·Chronobiology International·Timothy H MonkDavid J Kupfer

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