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Stephen Hunter, Andrei Rosu, Kylie D. Hesketh, Ryan E. Rhodes, Christina M. Rinaldi, Wendy Rodgers, John C. Spence and Valerie Carson

intervals of 0 counts. Data were considered complete if participants had at least 4 days, with at least 6 hours per day (≥1440 counts) of wear time ( 25 , 27 ). It was assumed that daytime naps were removed with nonwear time. Sedentary time was defined as 0 to 24 counts per 15 seconds, light

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Paddy C. Dempsey, Chuck E. Matthews, S. Ghazaleh Dashti, Aiden R. Doherty, Audrey Bergouignan, Eline H. van Roekel, David W. Dunstan, Nicholas J. Wareham, Thomas E. Yates, Katrien Wijndaele and Brigid M. Lynch

recommended amounts of moderate- to vigorous-intensity physical activity (MVPA). 5 – 8 Moreover, observational studies 9 – 11 and an accumulating body of acute experimental studies 12 suggest that specific patterns of sedentary time (ie, whether sedentary behavior is undertaken in more prolonged or shorter

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John J. Reilly, Adrienne R. Hughes, Xanne Janssen, Kathryn R. Hesketh, Sonia Livingstone, Catherine Hill, Ruth Kipping, Catherine E. Draper, Anthony D. Okely and Anne Martin

time spent sedentary. 9 – 11 Sedentary time continues to increase with age, producing further declines in physical activity. Although sleep requirements naturally decrease with age, sleep duration is also affected by time spent in physical activity and sedentary behavior. 12 , 13 These movement

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Nicholas D. Gilson, Caitlin Hall, Andreas Holtermann, Allard J. van der Beek, Maaike A. Huysmans, Svend Erik Mathiassen and Leon Straker

total sedentary exposure for adults in general (ie, 7–8 h/d; 55%–56% of awake time). 40 , 41 Sedentary time of 8 hours per day or more has been linked to increased risk of all-cause mortality, independently of PA, 42 and in those who are not highly active (ie, accumulate less than 60 min of MVPA

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Peter T. Katzmarzyk and Amanda E. Staiano

in children. 15 Using data from 20,871 children 4–8 years of age, Ekelund et al 16 reported that higher MVPA was associated with lower systolic blood pressure and triglycerides and higher HDL-C within tertiles of sedentary time; however, there was no association between sedentary behavior and risk

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Laureen H. Smith, Devin Laurent, Erica Baumker and Rick L. Petosa

school-aged children. 12 – 14 Adolescents have been studied for PA patterns and sedentary time. 2 , 5 , 9 , 15 These studies focused on national rates or relied on small samples. They may not reveal unique trends within subpopulations. Obesogenic behaviors among adolescents who live in Appalachia have

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Amber Watts, Mauricio Garnier-Villarreal and Paul Gardiner

available for activPAL ™ , we used wear and sleep time logs for wear time validation for activPAL ™ . Day time napping was included as sedentary behavior. Thus, estimates of sedentary time include only waking hours or daytime napping. Data were included in analyses if they met the following valid wear

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Ian M. Greenlund, Piersan E. Suriano, Steven J. Elmer, Jason R. Carter and John J. Durocher

or more hours per day compared with 5 or less hours per day. 4 The relation between sedentary behavior and CVD is complex. Sedentary behavior is shown to increase arterial stiffness and is a known contributor to hypertension and CVD. 5 , 6 Clearly, a reduction in sedentary time and replacement with

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Julien Tripette, Haruka Murakami, Hidemi Hara, Ryoko Kawakami, Yuko Gando, Harumi Ohno, Nobuyuki Miyatake and Motohiko Miyachi

, Sports, Science, and Technology, 2015 ). PA and Physical Fitness Step count (steps/day) and moderate-to-vigorous PA (MET-hr/day) were assessed objectively during a 1-month period, using accelerometer-based waist-worn PA monitors (Actimarker EW4800; Panasonic, Osaka, Japan). Sedentary time (<1.5 METs

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Stephanie M. George, Catherine M. Alfano, Ashley Wilder Smith, Melinda L. Irwin, Anne McTiernan, Leslie Bernstein, Kathy B. Baumgartner and Rachel Ballard-Barbash


Many cancer survivors experience declines in health-related quality of life (HRQOL) and increases in fatigue as a result of cancer and its treatment. Exercise is linked to improvements in these outcomes, but little is known about the role of sedentary behavior. In a large, ethnically-diverse cohort of breast cancer survivors, we examined the relationship between sedentary time, HRQOL, and fatigue, and examined if that relationship differed by recreational moderate-vigorous physical activity (MVPA) level.


Participants were 710 women diagnosed with stage 0-IIIA breast cancer in the Health, Eating, Activity, and Lifestyle Study. Women completed questionnaires at approximately 30-months postdiagnosis (sedentary time; recreational MVPA) and 41-months postdiagnosis (HRQOL; fatigue). In multivariate models, we regressed these outcomes linearly on quartiles of daily sedentary time, and a variable jointly reflecting sedentary time quartiles and MVPA categories (0; >0 to <9; ≥9 MET-hrs/wk).


Sedentary time was not independently related to subscales or summary scores of HRQOL or fatigue. In addition, comparisons of women with high vs. low (Q4:Q1) sedentary time by MVPA level did not result in significant differences in HRQOL or fatigue.


In this breast cancer survivor cohort, self-reported sedentary time was not associated with HRQOL or fatigue, 3.5 years postdiagnosis.