==== Front Innov Aging Innov Aging innovateage Innovation in Aging 2399-5300 Oxford University Press US 10.1093/geroni/igaa057.2866 igaa057.2866 Abstracts Session 7195 (Symposium) AcademicSubjects/SOC02600 Daily Physical Activity Patterns and Their Association With Health-Related Physical Fitness Among Aging Workers Stenholm Sari 1 Pulakka Anna 2 Leskinen Tuija 3 Pentti Jaana 4 Heinonen Olli 3 Koster Annemarie 5 Vahtera Jussi 3 1 University of Turku, Turku, Finland 2 National Institute for Health and welfare, Helsinki, Uusimaa, Finland 3 University of Turku, Turku, Varsinais-Suomi, Finland 4 University of Helsinki, Helsinki, Uusimaa, Finland 5 Maastricht University, Maastricht, Limburg, Netherlands 2020 16 12 2020 16 12 2020 4 Suppl 1 Program Abstracts from The GSA 2020 Annual Scientific Meeting “Turning 75: Why Age Matters”791 791 © The Author(s) 2020. Published by Oxford University Press on behalf of The Gerontological Society of America.2020This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted reuse, distribution, and reproduction in any medium, provided the original work is properly cited.Abstract This study aimed to identify accelerometer measured daily physical activity patterns and to examine how they associate with health-related physical fitness among 258 participants (mean age 62.4 years, SD 1.0) from the Finnish Retirement and Aging Study. Wrist-worn ActiGraph accelerometer was used and health-related physical fitness measures included body composition, cardiorespiratory fitness and muscular fitness. Based on latent class trajectory analysis, six different patterns of daily physical activity was identified on workdays and two on days off. Having low activity throughout the workday was associated with poorest health-related physical fitness, whereas a combination of low or moderate activity during working hours and increase of activity level in the evening was associated with most favorable body composition and better physical fitness compared to the other trajectories. In conclusion, a large variation in the workday physical activity patterns and health-related physical fitness was observed among aging workers.