Long Sleep Duration is Associated With Sarcopenia in Korean Adults Based on Data from the 2008–2011 KNHANES

In the current study, we demonstrated that, compared to participants who sleep an average of 7 hours per day, those who sleep ≥ 9 hours per day were significantly more likely to have sarcopenia in the Korean population. This association was still significant after adjusting for health status (BMI, smoking, exercise, alcohol consumption, and hypertension) and socioeconomic status (age, sex, household income, employment, and work schedule). After adjusting for the same confounding factors, significant associations between sleep duration and sarcopenia were found in participants with the following characteristics: middle-aged, with 18.5 ≤ BMI < 25 kg/m2, current smokers, and did not exercise regularly. In addition, despite the lack of significant significance, U-shaped associations between sleep duration and sarcopenia were shown in most subgroups. Risk factors of sarcopenia have not yet been fully investigated, and some risk factors shown in our study are consistent with those from previous studies. Castillo et al. identified both current smoking and physical inactivity as modifiable risk factors for sarcopenia.22 Although the sex-specific prevalence of sarcopenia varies by country, many observational studies, especially for the Korean population, found a higher prevalence of sarcopenia in men. Some inconsistent findings existed regarding the relationship between alcohol and sarcopenia. For instance, a number of previous studies suggested that alcohol decreased muscle protein synthesis.

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