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Nicolas Farina and Ruth G. Lowry

, Nicol, & Bredin, 2006 ). In addition, an active lifestyle for older adults is associated with reduced risk of musculoskeletal conditions such as arthritis and osteoporosis ( Broskey et al., 2014 ). Within research and clinical settings, activity monitors are commonly used as a means to objectively and

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Andrea L. Hergenroeder, Bethany Barone Gibbs, Mary P. Kotlarczyk, Subashan Perera, Robert J. Kowalsky, and Jennifer S. Brach

 al., 2012 ). Commercial activity monitors that count steps may be effective in measuring and promoting physical activity in older adults as walking is a common form of exercise and light activity in this age group ( Cavanaugh, Coleman, Gaines, Laing, & Morey, 2007 ). In addition, the knowledge of daily

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Natashia Swalve, Brianna Harfmann, John Mitrzyk, and Alexander H. K. Montoye

; Wells, Li, & Tugwell, 2010 ), but a need still remains for quantitative, objective examination of sleep that is relatively inexpensive and readily available. Recent advances in body-worn activity monitors, such as Fitbit, include monitoring of sleep, potentially presenting a convenient way of analyzing

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Christopher P. Connolly, Jordana Dahmen, Robert D. Catena, Nigel Campbell, and Alexander H.K. Montoye

). While these findings provide some understanding of activity trends during pregnancy, they are limited given most originate from self-report investigations which have clear shortcomings in capturing physical activity behavior. More recent investigations have utilized physical activity monitors

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Susan Park, Lindsay P. Toth, Scott E. Crouter, Cary M. Springer, Robert T. Marcotte, and David R. Bassett

in the popularity of wearable activity monitors has made step counting more convenient and accessible to the general public ( Almalki, Gray, & Sanchez, 2015 ; Evenson, Goto, & Furberg, 2015 ). In addition, steps can be derived from both research- and consumer-grade monitors. Researchers are using

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Rebekah Lynn, Rebekah Pfitzer, Rebecca R. Rogers, Christopher G. Ballmann, Tyler D. Williams, and Mallory R. Marshall

, Frederick, Harris, Carlson, & Fulton, 2015 ). Wrist-worn activity monitors help users track physical activity by providing feedback and allowing for self-monitoring and personal goal-setting related to physical activity ( Mercer, Li, Giangregorio, Burns, & Grindrod, 2016 ). Research suggests that these

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Alexander H.K. Montoye, John Vusich, John Mitrzyk, and Matt Wiersma

Improvements in technology, increased ownership of smartphones, and commercialization of wearable activity monitors has led to increased interest in personal physical activity (PA) assessment in recent years. For example, Fitbit (Fitbit Inc., San Francisco, CA), a leader in the consumer-based PA

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Shaima Alothman, Jeffrey C. Hoover, Mohammed M. Alshehri, Aqeel M. Alenazi, Jo Wick, Joseph LeMaster, Jason Rucker, and Patricia M. Kluding

the use of activity monitoring devices such as ActiGraph (ActiGraph LLC, Pensacola, FL) and activPAL ™ (PAL Technologies Ltd, Glasgow, Scotland, United Kingdom). 14 , 15 ActivPAL ™ is a small motion sensor, which classifies human physical behavior in to 3 categories: sitting/lying, standing, and

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Susan Park, Lindsay P. Toth, Paul R. Hibbing, Cary M. Springer, Andrew S. Kaplan, Mckenzie D. Feyerabend, Scott E. Crouter, and David R. Bassett

Wearable activity monitors play an important role in clarifying the relationships between physical activity (PA) and health ( Wijndaele et al., 2015 ; Wright, Hall Brown, Collier, & Sandberg, 2017 ). A common output of wearable activity monitors is steps, which is an intuitive metric for measuring

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Lindsay P. Toth, Susan Park, Whitney L. Pittman, Damla Sarisaltik, Paul R. Hibbing, Alvin L. Morton, Cary M. Springer, Scott E. Crouter, and David R. Bassett

; Swartz et al., 2003 ). Steps have historically been measured with waist-worn pedometers, but a variety of physical activity monitors (PAMs) are now available to consumers and scientific researchers alike. While some PAMs use only one method of step counting, others (e.g., ActiGraph and StepWatch) offer