title: Associations of breaks in sedentary time with abdominal obesity in Portuguese older adults.
abstract: In older adults, sedentary time is positively associated with obesity. The manner in which it is accumulated, i.e., the number of breaks in sedentary time, might be also important. We examined the cross-sectional associations of breaks in sedentary time with abdominal obesity in 301 older adults (111 men and 190 women) aged 75.0 ± 6.8 years. Sedentary time (counts min(-1) < 100) and physical activity were objectively measured by accelerometry, worn during waking hours for at least three consecutive days. A break was defined as an interruption (≥ 100 counts min(-1) < 2020) in sedentary time while performing light intensity physical activities. Sedentary time was expressed as the number of daily breaks in sedentary time or hourly breaks in sedentary time. Abdominal obesity was defined by waist circumference (men >102 cm; women >88 cm). Using binary logistic regression analyses, the odds for abdominal obesity decreased 7 % for each additional hourly break in sedentary time in women (OR = 0.93, 95 % CI: 0.87-1.00), but not men, independently of total sedentary time and moderate-to-vigorous physical activity. The odds for abdominal obesity were 3.21 times higher (p = 0.039) for women in quartile 1 (<225 breaks day(-1)) of daily breaks in sedentary time compared to those in quartile 4 (>353 breaks day(-1)) of daily breaks in sedentary time.These findings indicate that older women who interrupt their sedentary time more frequently are less likely to present abdominal obesity. Public health recommendations regarding breaking-up sedentary time complementary to those for physical activity are likely to be relevant.
authors.forename: Pedro B
authors.initials: PB
authors.lastname: Júdice
authors.forename: Analiza M
authors.initials: AM
authors.lastname: Silva
authors.forename: Diana A
authors.initials: DA
authors.lastname: Santos
authors.forename: Fátima
authors.initials: F
authors.lastname: Baptista
authors.forename: Luís B
authors.initials: LB
authors.lastname: Sardinha
mesh_terms: D000368:Aged; D000369:Aged, 80 and over; D004651:Employment / Q000706:statistics & numerical data; D005260:Female; D006796:Household Work / Q000706:statistics & numerical data; D006801:Humans; D008297:Male; D056128:Obesity, Abdominal / Q000453:epidemiology*; D012307:Risk Factors; D057185:Sedentary Behavior; D013997:Time Factors; D055105:Waist Circumference
references.citation: Int J Sports Med. 2013 Jan;34(1):62-7
references.pmid: 22903316
references.citation: PLoS One. 2013;8(1):e54225
references.pmid: 23326600
references.citation: Med Sci Sports Exerc. 2013 Mar;45(3):481-9
references.pmid: 23034646
references.citation: Diabetologia. 2013 May;56(5):1012-20
references.pmid: 23456209
references.citation: Med Sci Sports Exerc. 2013 Jul;45(7):1410-8
references.pmid: 23377836
references.citation: Med Sci Sports Exerc. 2013 Aug;45(8):1493-500
references.pmid: 23475142
references.citation: Am J Clin Nutr. 2013 Aug;98(2):358-66
references.pmid: 23803893
references.citation: J Phys Act Health. 2013 Nov;10(8):1166-74
references.pmid: 23220844
references.citation: Br J Sports Med. 2014 Feb;48(3):174-7
references.pmid: 24415410
references.citation: Obes Res. 1998 Sep;6 Suppl 2:51S-209S
references.pmid: 9813653
references.citation: Coron Artery Dis. 1998;9(8):489-94
references.pmid: 9847980
references.citation: J Appl Physiol (1985). 2006 Jan;100(1):249-57
references.pmid: 16195388
references.citation: Diabetes. 2007 Nov;56(11):2655-67
references.pmid: 17827399
references.citation: Metabolism. 2010 Apr;59(4):520-6
references.pmid: 19850310
references.citation: Atherosclerosis. 2010 May;210(1):307-13
references.pmid: 20031131
references.citation: Diabetes Care. 2011 Feb;34(2):497-503
references.pmid: 21270206
references.citation: Age Ageing. 2011 Mar;40(2):205-10
references.pmid: 21239410
references.citation: Eur Heart J. 2011 Mar;32(5):590-7
references.pmid: 21224291
references.citation: Am J Prev Med. 2011 Aug;41(2):174-7
references.pmid: 21767725
references.citation: Am J Prev Med. 2011 Aug;41(2):216-27
references.pmid: 21767730
references.citation: Int J Behav Nutr Phys Act. 2011;8:69
references.pmid: 21708007
references.citation: Age Ageing. 2012 Jan;41(1):111-4
references.pmid: 21749993
references.citation: Am J Hum Biol. 2012 Jan-Feb;24(1):28-34
references.pmid: 22121086
references.citation: Prev Chronic Dis. 2012;9:E26
references.pmid: 22172193
references.citation: J Epidemiol. 2012;22(1):50-6
references.pmid: 22156288
references.citation: Med Sci Sports Exerc. 2012 Mar;44(3):466-73
references.pmid: 21844823
references.citation: Obesity (Silver Spring). 2012 Mar;20(3):576-82
references.pmid: 21959343
references.citation: Diabetes Care. 2012 May;35(5):976-83
references.pmid: 22374636
references.citation: J Aging Phys Act. 2012 Jul;20(3):332-44
references.pmid: 22186833
references.citation: Clin Nutr. 2012 Oct;31(5):756-64
references.pmid: 22595654
references.citation: PLoS One. 2012;7(10):e47883
references.pmid: 23118905