Aim: Sedentary behavior and physical inactivity increase the risk of cardiometabolic diseases. It is important to evaluate physical activity in daily life and understand the influence of these factors on cardiometabolic diseases in the Japanese population, which tends to have a prolonged sitting time. We examined the association between sedentary behavior and physical inactivity, characterized by extended television (TV) viewing and low step counts, which are easily monitored and modifiable, and cardiometabolic risk factors in the Japanese population.

Methods: This cross-sectional study included 2,531 Japanese adults (1,087 men and 1,444 women) 20-91 years old, randomly selected throughout Japan. TV viewing was assessed using a self-reported questionnaire, and step counts were measured using pedometers. Cardiometabolic risk factors were determined using physical examinations or blood samples. The association between sedentary behavior and physical inactivity with each risk factor was examined using a cross-sectional analysis with multivariate-adjusted logistic regression models.

Results: In both sexes, longer TV viewing positively correlated with low high-density lipoprotein (HDL) cholesterol and high triglycerides (TG). In women, TV viewing time is associated with obesity and increased abdominal circumference (AC). Conversely, in men, lower step counts were positively associated with obesity and increased AC, low HDL cholesterol, and high TG levels.

Conclusions: The association between prolonged TV viewing and cardiometabolic risk factors was more pronounced in women than in men, whereas the influence of lower step counts was stronger in men than in women. These findings contribute to the improvement of cardiovascular health by monitoring and managing individual screen times and step counts in daily life.

Keywords: Cardiometabolic disease; Dyslipidemia; Obesity; Step count; TV viewing.

目的： 久坐行为和身体不活跃会增加心血管代谢疾病的风险。评估日常生活中身体活动的情况，并了解这些因素对日本人口中心血管代谢疾病的影响十分重要，因为日本人往往有较长的坐着时间。我们研究了以延长电视（TV）观看时间和较低步数为特征的久坐行为和身体不活跃与日本人群中心血管代谢风险因素之间的关联。

方法： 这项横断面研究包括2531名随机选取自全日本各地区的成年人（1087名男性和1444名女性），年龄在20至91岁之间。通过自我报告问卷评估了电视观看时间，并使用计步器测量了步数。心血管代谢风险因素是根据体检或血液样本确定的。使用多变量调整的逻辑回归模型进行了横断面分析，以考察久坐行为和身体不活跃与每个风险因素之间的关联。

结果： 在两性中，更长的电视观看时间都与低高密度脂蛋白（HDL）胆固醇和高水平甘油三酯（TG）呈正相关。在女性中，看电视的时间与肥胖和增加的腰围（AC）有关。相反，在男性中，较低的步数与肥胖、增加的AC、低HDL胆固醇水平和高水平TG呈正相关。

结论： 长时间观看电视与心血管代谢风险因素之间的关联在女性中比在男性中更为显著，而较低的步数的影响则在男性中比在女性中更强。这些发现有助于通过监测和管理日常生活中的屏幕时间和步数来改善心血管健康。

关键词： 心血管代谢疾病；脂质异常；肥胖；步数；电视观看。