College of Kinesiology and Health Science, Huaihua University, Huaihua 418008, China.
School of Kinesiology, University of Minnesota Twin Cities, Minneapolis, MN 55414, USA.
Int J Environ Res Public Health. 2021 Apr 9;18(8):3946. doi: 10.3390/ijerph18083946.
Sedentary behavior (SB), sleep efficiency (SE), sleep duration (SD), and body mass index (BMI) are crucial determinants of an individual's health. However, empirical evidence regarding associations between these factors in young adults living in China remains unknown. Therefore, the purpose of this study was to examine the relationships between accelerometer-measured SB, SE, SD, and BMI in Chinese college students.
Two-hundred and twenty college students (115 females, = 20.29 years, SD = 2.37) were recruited from a south-central Chinese university. Participants' SB (daily % time spent in SB), SE (number of minutes of sleep duration/number of minutes in bed), and SD were assessed via wrist-worn ActiGraph GT9X Link accelerometers for one week. Body weight was measured using a digital weight scale, height was measured using a stadiometer, and BMI was calculated as weight (kg)/height (m).
Participants' average time spent in SB was 76.52% (SD = 10.03), SE was 84.12% (SD = 4.79), and BMI was 20.67 kg/m (SD = 3.12), respectively. Regression analyses indicated that SB (β = -0.17, = 0.01) and BMI (β = -0.20, < 0.01) negatively predicted SE. In addition, BMI negatively predicted SD (β = -0.22, < 0.01).
Prolonged SB (e.g., screen viewing, smartphone use, and computer playing) and higher BMI may link to shorter sleep duration and lower sleep efficiency in Chinese young adults. Future randomized controlled trials are needed to further confirm these findings. Given that increased BMI status and SB may relate to adverse health outcomes, more population-based intervention strategies seeking to lower BMI and reduce SB (e.g., nutrition education and physical activity promotion) are needed in this population.
久坐行为（SB）、睡眠效率（SE）、睡眠持续时间（SD）和体重指数（BMI）是个体健康的重要决定因素。然而，关于生活在中国的年轻成年人中这些因素之间关联的实证证据尚不清楚。因此，本研究的目的是探讨中国大学生中加速度计测量的 SB、SE、SD 和 BMI 之间的关系。
从一所中国中南部大学招募了 220 名大学生（女性 115 名，年龄 = 20.29 岁，SD = 2.37）。参与者的 SB（每天 SB 时间百分比）、SE（睡眠时间/卧床时间分钟数）和 SD 通过佩戴在手腕上的 ActiGraph GT9X Link 加速度计评估一周。体重使用数字体重秤测量，身高使用身高计测量，BMI 计算为体重（kg）/身高（m）。
参与者的平均 SB 时间为 76.52%（SD = 10.03），SE 为 84.12%（SD = 4.79），BMI 为 20.67 kg/m（SD = 3.12）。回归分析表明，SB（β = -0.17， = 0.01）和 BMI（β = -0.20， < 0.01）负预测 SE。此外，BMI 负预测 SD（β = -0.22， < 0.01）。
长时间的 SB（例如，屏幕观看、智能手机使用和电脑游戏）和更高的 BMI 可能与中国年轻成年人的睡眠时间较短和睡眠效率较低有关。需要进一步的随机对照试验来进一步证实这些发现。鉴于 BMI 状态增加和 SB 可能与不良健康结果有关，在该人群中需要更多以降低 BMI 和减少 SB 为目标的基于人群的干预策略（例如，营养教育和体育活动促进）。
