Endocrinol Metab.  2023 Dec;38(6):709-719. 10.3803/EnM.2023.1740.

Familial Correlation and Heritability of Hand Grip Strength in Korean Adults (Korea National Health and Nutrition Examination Survey 2014 to 2019)

• Ahn SH
• Park EB
• Seo S
• Cho Y
• Seo DH
• Kim SH
• Suh YJ
• Hong S

• KMID: 2549264
• DOI: http://doi.org/10.3803/EnM.2023.1740

Abstract

Background
The onset and progression of sarcopenia are highly variable among individuals owing to genetic and environmental factors. However, there are a limited number of studies measuring the heritability of muscle strength in large numbers of parent-adult offspring pairs. We aimed to investigate the familial correlation and heritability of hand grip strength (HGS) among Korean adults.
Methods
This family-based cohort study on data from the Korea National Health and Nutrition Examination Survey (2014 to 2019) included 5,004 Koreans aged ≥19 years from 1,527 families. HGS was measured using a digital grip strength dynamometer. Familial correlations of HGS were calculated in different pairs of relatives. Variance component methods were used to estimate heritability.
Results
The heritability estimate of HGS among Korean adults was 0.154 (standard error, 0.066). Correlation coefficient estimates for HGS between parent-offspring, sibling, and spouse pairs were significant at 0.07, 0.10, and 0.23 (P<0.001, P=0.041, and P<0.001, respectively). The total variance in the HGS phenotype was explained by additive genetic (15.4%), shared environmental (11.0%), and unique environmental (73.6%) influences. The odds of weak HGS significantly increased in the offspring of parents with weak HGS (odds ratio [OR], 1.69–3.10; P=0.027–0.038), especially in daughters (OR, 2.04–4.64; P=0.029–0.034).
Conclusion
HGS exhibits a familial correlation and significant heritable tendency in Korean adults. Therefore, Asian adults, especially women, who have parents with weak HGS, need to pay special attention to their muscle health with the help of healthy environmental stimuli.

Keyword

Hand grip strength; Heritability; Korean family; Muscle strength; Sarcopenia

Figure

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  Fig. 1. Flow chart of study participant selection. KNHANES, Korea National Health and Nutrition Examination Survey; HGS, hand grip strength.

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