Korean J Fam Pract 2020; 10(4): 298-306  https://doi.org/10.21215/kjfp.2020.10.4.298
Association of Sleep Duration with Hand Grip Strength in Adults: Korea National Health and Nutrition Examination Survey (2014–2017)
Woo Jin Kim1, Jae Kyung Choi1, Hyuk Jung Kwon2, Jin Young Shin1, Eun-Jung Oh2,*, Kyung Jin Kim1
1Department of Family Medicine, Konkuk University Medical Center, Konkuk University School of Medicine, Seoul; 2Department of Family Medicine, Konkuk University Chungju Hospital, Konkuk University School of Medicine, Chungju, Korea
Eun-Jung Oh
Tel: +82-43-840-8660, Fax: +82-43-840-8962
E-mail: oej98@hanmail.net
ORCID: http://orcid.org/0000-0001-6592-4579
Received: October 22, 2019; Revised: June 4, 2020; Accepted: June 12, 2020; Published online: August 20, 2020.
© The Korean Academy of Family Medicine. All rights reserved.

This is an open-access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/by-nc/4.0) which permits unrestricted noncommercial use, distribution, and reproduction in any medium, provided the original work is properly cited.
Background: Hand grip strength (HGS) is used clinically with regards to rehabilitation and recommended as a basic measure in determining musculoskeletal function, weakness, and disability. The purpose of this study was to examine the relationship between sleep duration and muscle strength in Korean adults.
Methods: The Korea National Health and Nutrition Examination Survey (KNHANES) is a cohort survey investigating the health behavior, chronic disease prevalence, and food and nutrition intake statuses of the Korean population. We analyzed the association between sleep duration and hand grip strength by performing a logistic regression analysis on KNHANES data from 2014 to 2017. All statistical analyses were performed with SPSS and R tools.
Results: Among the 20,933 participants, compared to the group of patients who slept less than 5 hours a day, the group of patients who slept 6–7 hours had higher HGS, whereas the group of patients who slept more than 9 hours had weaker HGS. This trend was more apparent in the elderly population.
Conclusion: This study of the adult population of South Korea suggests that sleeping for approximately 6 to 7 h a day increases muscle strength and general well-being, whereas extreme sleep durations, such as less than 5 h or more than 9 h, result in weaker muscle strength, in general.
Keywords: Hand Grip Strength; Sleep Duration; Korea National Health and Nutrition Examination Survey
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