Oral health is closely linked to overall health and quality of life, as the oral cavity plays a crucial role in mastication, pronunciation, and aesthetics. In particular, a decline in masticatory function can lead to malnutrition, sarcopenia, or cognitive decline. Therefore, maintaining masticatory function is essential for healthy aging. Most previous studies reporting the association between masticatory function and general health assessed chewing function using chewing gum or jelly. However, as the super-aging society continues, there is a need to evaluate masticatory function using new methods because the decline in masticatory function can manifest in various ways. To date, few studies have examined the relationship between the function of masticatory muscles, as measured by surface electromyography(sEMG), and overall physical function. Therefore, this study aimed to analyze the association between the ability of masticatory muscles, as assessed using sEMG, and grip strength, an indicator of overall muscle strength, in adults aged 55 years and older. This study involved 104 adults (10 men and 94 women; mean age of 71.67 ± 7.04 years) who voluntarily participated in the "Longitudinal Study on Daily Life of Older Adults through Smart Home Implementation" project conducted at ○○ University from March 10 to August 30, 2025. Teethan(Teethan S.P.A., Milan, Italy), a sEMG-based device was used to analyze muscle activity in the anterior temporalis muscles and masseter. This study utilized six evaluation indices of occlusal condition. Grip strength was measured using a digital grip dynamometer (InGrip, InBody, Korea) to assess the participants’ overall muscle strength and functional performance. Pearson’s correlation analysis and multiple linear regression were performed to analyze the association between masticatory muscle activity and grip strength, as well as the intensity of the association. Among the sEMG indices, ASYMMETRY(n=60) had the largest number of participants within the normal range, while BARYCENTER(n=17) had the fewest. Grip strength was negatively correlated with TORSION, the index that assesses the torsional attitude of the mandible in the horizontal plane(p<0.05). Meanwhile, grip strength showed a positive correlation with IMPACT, the index representing overall masticatory muscle activity(p<0.05). In the regression model controlling for gender and age, it was found that a higher IMPACT, an indicator proportional to occlusal force, was associated with a higher level of grip strength(p<0.05). The findings of this study suggest that the function of the masticatory muscles may potentially influence not only oral health but also the function of the overall body.