Júdice Pedro B, Silva Analiza M, Santos Diana A, Baptista Fátima, Sardinha Luís B
Age (Dordr). 2015;37(2):23. doi: 10.1007/s11357-015-9760-6.
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.
在老年人中，久坐时间与肥胖呈正相关。久坐时间的累积方式，即久坐期间的中断次数，可能也很重要。我们研究了301名年龄在75.0±6.8岁的老年人（111名男性和190名女性）久坐时间中断与腹部肥胖之间的横断面关联。通过加速度计客观测量久坐时间（每分钟计数<100）和身体活动，在清醒时间佩戴至少连续三天。一次中断被定义为在进行轻度强度身体活动时久坐时间的中断（≥100次计数/分钟<2020次计数/分钟）。久坐时间表示为久坐时间的每日中断次数或每小时中断次数。腹部肥胖通过腰围定义（男性>102厘米；女性>88厘米）。使用二元逻辑回归分析，在女性中，每增加一次久坐时间的每小时中断，腹部肥胖的几率降低7%（OR = 0.93，95%CI：0.87 - 1.00），但男性则不然，独立于总久坐时间和中度至剧烈身体活动。与久坐时间每日中断四分位数4（>353次/天）的女性相比，久坐时间每日中断四分位数1（<225次/天）的女性腹部肥胖的几率高3.21倍（p = 0.039）。这些发现表明，更频繁中断久坐时间的老年女性出现腹部肥胖的可能性较小。关于打破久坐时间的公共卫生建议与那些关于身体活动的建议相辅相成可能是相关的。
