Objectives: Previous research studies have reported that long or short hours of sleep will raise the probability of getting diseases, such as obesity, diabetes, high blood pressure, and cardiovascular disease, compared to having the optimum hours of sleep. However, the definition of 'optimum ho...
Objectives: Previous research studies have reported that long or short hours of sleep will raise the probability of getting diseases, such as obesity, diabetes, high blood pressure, and cardiovascular disease, compared to having the optimum hours of sleep. However, the definition of 'optimum hours' of sleeping was unclear as each research paper uses different dimension of 'optimum hours of sleep'. This research was conducted to determine if 8 hours of sleep commonly known as the 'optimum level of sleeping hours' in South Korea was an appropriate value to investigate how short or long hours of sleep could affect human physical condition and to understand the relationship between chronic disease and sleeping hours. It is expected that this research will provide basic information for the prevention and control of chronic diseases. Comprehension of the relationship between chronic disease and sleeping hours in Korean people was mainly based on "Korea National Health and Nutrition Examination Survey for 2013" conducted by the Centers for Disease Control and Prevention.
Methods: A total of 8018 people were enrolled in the Korea National Health and Nutrition Examination Survey 2013. After excluding those who were under the age of 19, a total of 6273 people were left. After excluding people whose sleeping hours or Body Mass Index (BMI) information was unavailable and those who already hold chronic diseases, a total of 5129 people (2952 females, 2177 males) were enrolled in this study. Considering the average Korean people's sleeping time of 6.9 hours and 7.8 hours set by Centers for Disease Control and Prevention and OECD, respectively, five different categories of sleeping hours (below 4 hrs, 5 hrs, 6 to 7 hrs, 8 hrs, more than 9 hrs) were set as independent variable in this study. The prevalence rate of chronic diseases (high blood pressure, diabetes, hyperlipidemia, cerebral accident, metabolic syndrome) was used as a dependent variable. To compare between two different groups, Chi-squared test and variance analysis were implemented for statistical analysis. To investigate the relationship between the hours of sleeping and the prevalence rate of chronic diseases, multiple logistic regression analysis was conducted. All materials were analyzed using SAS 9.4. The level of significance was set at 0.05 with two tailed test.
Disruption variable may affect the dependent variable, including variables reported in previous researches. According to different type of chronic diseases, the following factors were adjusted to minimize the misrepresentation of statistics caused by confounding variables: age, sex, smoking, income, alcohol-consumption, systolic blood pressure, diastolic blood pressure, BMI, exercise, and total cholesterol.
Results: In the case of diabetes, having 4 hours of sleep increased its prevalence by 1.57 times, 8 hours of sleep increased its prevalence by 1.33 times, and sleeping for more than 9 hours had 1.573 times higher prevalence rate compared to having 6∼7 hours of sleep. The prevalence rates of high blood pressure and diabetes in men are 2.023 times and 1.895 times higher, respectively. The prevalence rates of hyperlipidemia and diabetes in women are 1.644 and 1.650 times greater when they have less than 4 hours of sleep.
Conclusion: The result of this research suggests that optimum level of sleeping hours is 6 to 7 hours per day. This study also revealed that having lesser hours of sleep caused higher prevalence rate of chronic diseases, similar to results of previous studies. However, this research revealed that sleeping for more than 9 hours had higher prevalence of chronic diseases. Having lesser sleeping hours than the suggested optimum sleeping hours will increase the possibility of getting chronic disease. To prevent chronic disease, it is important to have the optimum level of sleeping hours.
Keywords: sleeping hours, chronic diseases, 6∼7 hours of sleep
Objectives: Previous research studies have reported that long or short hours of sleep will raise the probability of getting diseases, such as obesity, diabetes, high blood pressure, and cardiovascular disease, compared to having the optimum hours of sleep. However, the definition of 'optimum hours' of sleeping was unclear as each research paper uses different dimension of 'optimum hours of sleep'. This research was conducted to determine if 8 hours of sleep commonly known as the 'optimum level of sleeping hours' in South Korea was an appropriate value to investigate how short or long hours of sleep could affect human physical condition and to understand the relationship between chronic disease and sleeping hours. It is expected that this research will provide basic information for the prevention and control of chronic diseases. Comprehension of the relationship between chronic disease and sleeping hours in Korean people was mainly based on "Korea National Health and Nutrition Examination Survey for 2013" conducted by the Centers for Disease Control and Prevention.
Methods: A total of 8018 people were enrolled in the Korea National Health and Nutrition Examination Survey 2013. After excluding those who were under the age of 19, a total of 6273 people were left. After excluding people whose sleeping hours or Body Mass Index (BMI) information was unavailable and those who already hold chronic diseases, a total of 5129 people (2952 females, 2177 males) were enrolled in this study. Considering the average Korean people's sleeping time of 6.9 hours and 7.8 hours set by Centers for Disease Control and Prevention and OECD, respectively, five different categories of sleeping hours (below 4 hrs, 5 hrs, 6 to 7 hrs, 8 hrs, more than 9 hrs) were set as independent variable in this study. The prevalence rate of chronic diseases (high blood pressure, diabetes, hyperlipidemia, cerebral accident, metabolic syndrome) was used as a dependent variable. To compare between two different groups, Chi-squared test and variance analysis were implemented for statistical analysis. To investigate the relationship between the hours of sleeping and the prevalence rate of chronic diseases, multiple logistic regression analysis was conducted. All materials were analyzed using SAS 9.4. The level of significance was set at 0.05 with two tailed test.
Disruption variable may affect the dependent variable, including variables reported in previous researches. According to different type of chronic diseases, the following factors were adjusted to minimize the misrepresentation of statistics caused by confounding variables: age, sex, smoking, income, alcohol-consumption, systolic blood pressure, diastolic blood pressure, BMI, exercise, and total cholesterol.
Results: In the case of diabetes, having 4 hours of sleep increased its prevalence by 1.57 times, 8 hours of sleep increased its prevalence by 1.33 times, and sleeping for more than 9 hours had 1.573 times higher prevalence rate compared to having 6∼7 hours of sleep. The prevalence rates of high blood pressure and diabetes in men are 2.023 times and 1.895 times higher, respectively. The prevalence rates of hyperlipidemia and diabetes in women are 1.644 and 1.650 times greater when they have less than 4 hours of sleep.
Conclusion: The result of this research suggests that optimum level of sleeping hours is 6 to 7 hours per day. This study also revealed that having lesser hours of sleep caused higher prevalence rate of chronic diseases, similar to results of previous studies. However, this research revealed that sleeping for more than 9 hours had higher prevalence of chronic diseases. Having lesser sleeping hours than the suggested optimum sleeping hours will increase the possibility of getting chronic disease. To prevent chronic disease, it is important to have the optimum level of sleeping hours.
Keywords: sleeping hours, chronic diseases, 6∼7 hours of sleep
주제어
#sleeping hours chronic diseases 6∼7 hours of sleep
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