Purpose: Previous studies have struggled to confirm independent associations between grip strength and nonalcoholic fatty liver disease (NAFLD) when considering individual metabolic syndrome (MetS) risk factors. The primary aim of this study was to elucidate the association between relative grip strength (RGS) and the incidence of NAFLD, with a focus on MetS, using longitudinal data. Methods: The study included 1,702 general adult participants aged 51 to 88 years who completed surveys during the 2013−2020 periods. NAFLD was assessed using the hepatic steatosis index, while RGS was measured with the JAMA 5030J1 (Saehan) device. A Cox proportional hazards regression model was employed to evaluate the relationship between RGS, MetS risk factors, and the risk of developing NAFLD. Hazard ratio (HR) and 95% confidence interval (CI) were calculated for NAFLD incidence. Results: After adjusting for various confounding variables, a 76% reduction in the HR for NAFLD incidence was observed in both the non-MetS and MetS groups among individuals with high RGS levels compared to those with low RGS levels (HR, 0.24; 95% CI, 0.15−0.38). High RGS levels were significantly associated with a reduced HR for NAFLD incidence across all MetS risk factors compared to low RGS levels. Notably, a significant association between moderate RGS and reduced NAFLD incidence risk was found only in the high triglyceride and low high-density lipoprotein-cholesterol group. Conclusion This study demonstrates that high levels of RGS are independently associated with a reduced risk of developing NAFLD, particularly in relation to MetS status.

Purpose: Cancer remains a leading global cause of morbidity and mortality; few studies have explored the impact of long-term changes in sitting time (ST) or its associations with cancer incidence risk across levels of insulin resistance. The aim of this study is to examine the association between daily ST, changes in ST over 2 years, and cancer risk. Methods: We analyzed data from 2,474 older adults participating in a Korean community-based cohort study. Daily ST and 2-year changes in ST were assessed using validated self-report questionnaires. Daily ST was categorized as ＜5 hours, ≥5 and ＜10 hours, and ≥10 hours per day. Two-year changes in ST were classified into four groups:consistently low (consistently inactive), decreased (formerly active), increased (newly active), and consistently high (consistently active). Cancer was classified according to the survey question. Multivariable extended Cox regression models were used to estimate hazard ratios (HR) and 95% confidence intervals (CI) for cancer incidence. Results: Daily ST of ≥ 10 hours was associated with an 85% increased risk of cancer, even after adjusting for other confounding variables (HR, 1.84; 95% CI, 1.18−2.85). Also, after adjusting for confounding variables, the consistently ST group showed a 55% higher cancer risk (HR, 1.55; 95% CI, 1.02−2.36). These findings underscore the independent and interactive contributions of daily ST, changes in ST, and insulin resistance to cancer risk. Conclusion This study demonstrates that daily ST of 10 hours or more or sustained high levels of ST over 2 years are associated with an elevated risk of cancer

Purpose: The purpose of the present study was to investigate the relationship between changes in sitting time (ST) with the risk of developing metabolic syndrome. Methods: This study examined 2,814 adults aged 40 to 69 years who participated in the Korean Genome and Epidemiology Study, a community-based cohort study, for a total of 10 years. Changes in ST were assessed using the results obtained from physical activity questionnaires completed during the baseline and follow-up surveys. The diagnosis of metabolic syndrome was classified according to the criteria established by the International Diabetes Federation. We conducted survival analysis by the multivariate extended Cox regression model. The significance level for all analyses was set at p＜ 0.05. Results: We compared the newly ST group with ST less than 7 hours in the baseline and more than 7 hours in the first follow-up to the consistently non-ST group with ST less than 7 hours in both the baseline and the first follow-up. In this comparison, we found that the hazard ratio (HR) for the incidence of metabolic syndrome increasedby 33% (HR, 1.33; 95% confidence interval [CI], 1.02–1.74) for changes in total daily sedentary time and by 47% (HR, 1.47; 95% CI, 1.13–1.92) for changes in weekday sedentary time in the newly ST group. Conclusion Changes in ST are associated with the risk of developing metabolic syndrome. These findings can serve as fundamental data for further research on the relationship between changes in ST, and the occurrence of metabolic syndrome.

Purpose: This study aims to investigate the association between changes in sitting time based on sex and levels of physical activity participation and the risk of hypertension. Methods: Conducted as a follow-up to the 2011–2012 baseline survey in the Korean Genome and Epidemiology Study community-based cohort study, the 4th tracking took place from 2019 to 2020 in Korea, involving adults aged 49 to 79 years. Hypertension status was determined based on systolic blood pressure ≥ 140 mm Hg, diastolic blood pressure ≥ 90 mm Hg, self-reported diagnosis, or medication usage. Change in sitting time was measured using a physical activity questionnaire. The study utilized multivariate extended Cox regression models to calculate independent risk ratios and 95% confidence intervals (CIs) for risk of developing hypertension based on change in sitting time, with a significance level set at p＜ 0.05. Results: Despite adjusting for various factors affecting sitting time and hypertension, total sitting time (hazard ratio [HR], 1.37; 95% CI, 1.05–1.78) and weekday sitting time (HR, 1.34; 95% CI, 1.03–1.76) in the newly ST group showed increased risk of developing hypertension. It was observed that increased total and weekday sitting time in males could elevate hypertension risk (total newly ST: HR, 1.52; 95% CI, 1.05–2.21; weekday newly ST: HR, 1.57; 95% CI, 1.08–2.28). Additionally, the association between changes in sitting time and risk of developing hypertension varied based on leisure-related physical activity levels. Conclusion The study confirms that increased sitting time raises the risk of hypertension and that reducing sitting time in physically inactive adults can lower the risk of developing hypertension.

Purpose: Our primary aim was to elucidate the joint association between relative grip strength (RGS) and regular exercise participation with non-alcoholic fatty liver disease (NAFLD) incidence, utilizing longitudinal data. Methods: A total of 1,702 participants in this study comprised general adults aged 51 to 88 years, who had engaged in the survey both in 2013 to 2018 and during the subsequent follow-up in 2019 to 2020. NAFLD were determined by using the hepatic steatosis index. RGS was determined using the JAMA-5030J1 equipment (SAEHAN). To validate the relationship between the interaction of RGS and regular exercise participation and its impact on risk of developing NAFLD, a proportional hazards Cox regression model was used. Subsequently, we computed the hazard ratio (HR) and 95% confidence interval (95% CI) for NAFLD. Results: In the non-regular exercise group, middle RGS and high RGS reduced the HR for NAFLD by 29% (HR,0.71; 95% CI, 0.51–0.99) and 78% (HR, 0.22; 95% CI, 0.13–0.35), respectively, compared to low RGS. Significantassociations were observed only between high RGS and HR for NAFLD in the regular exercise group (HR, 0.40;95% CI, 0.22–0.72). Furthermore, in all subjects, both the high RGSon-regular exercise and high RGS/regular exercise groups showed a respective 60% (HR, 0.40; 95% CI, 0.29–0.56) and 54% (HR, 0.44; 95% CI, 0.31–0.63)lower HR for NAFLD compared to the low RGSon-regular exercise group. Conclusion This study investigates that high level of RGS were independently associated with reducing risk of developing NAFLD. RGS is an important factor that can predict the risk of developing NAFLD, and regular exercise participation is essential for increasing RGS.

Purpose: Our primary aim was to elucidate the joint association between relative grip strength (RGS) and regular exercise participation with non-alcoholic fatty liver disease (NAFLD) incidence, utilizing longitudinal data. Methods: A total of 1,702 participants in this study comprised general adults aged 51 to 88 years, who had engaged in the survey both in 2013 to 2018 and during the subsequent follow-up in 2019 to 2020. NAFLD were determined by using the hepatic steatosis index. RGS was determined using the JAMA-5030J1 equipment (SAEHAN). To validate the relationship between the interaction of RGS and regular exercise participation and its impact on risk of developing NAFLD, a proportional hazards Cox regression model was used. Subsequently, we computed the hazard ratio (HR) and 95% confidence interval (95% CI) for NAFLD. Results: In the non-regular exercise group, middle RGS and high RGS reduced the HR for NAFLD by 29% (HR,0.71; 95% CI, 0.51–0.99) and 78% (HR, 0.22; 95% CI, 0.13–0.35), respectively, compared to low RGS. Significantassociations were observed only between high RGS and HR for NAFLD in the regular exercise group (HR, 0.40;95% CI, 0.22–0.72). Furthermore, in all subjects, both the high RGSon-regular exercise and high RGS/regular exercise groups showed a respective 60% (HR, 0.40; 95% CI, 0.29–0.56) and 54% (HR, 0.44; 95% CI, 0.31–0.63)lower HR for NAFLD compared to the low RGSon-regular exercise group. Conclusion This study investigates that high level of RGS were independently associated with reducing risk of developing NAFLD. RGS is an important factor that can predict the risk of developing NAFLD, and regular exercise participation is essential for increasing RGS.

Purpose: Our primary aim was to elucidate the joint association between relative grip strength (RGS) and regular exercise participation with non-alcoholic fatty liver disease (NAFLD) incidence, utilizing longitudinal data. Methods: A total of 1,702 participants in this study comprised general adults aged 51 to 88 years, who had engaged in the survey both in 2013 to 2018 and during the subsequent follow-up in 2019 to 2020. NAFLD were determined by using the hepatic steatosis index. RGS was determined using the JAMA-5030J1 equipment (SAEHAN). To validate the relationship between the interaction of RGS and regular exercise participation and its impact on risk of developing NAFLD, a proportional hazards Cox regression model was used. Subsequently, we computed the hazard ratio (HR) and 95% confidence interval (95% CI) for NAFLD. Results: In the non-regular exercise group, middle RGS and high RGS reduced the HR for NAFLD by 29% (HR,0.71; 95% CI, 0.51–0.99) and 78% (HR, 0.22; 95% CI, 0.13–0.35), respectively, compared to low RGS. Significantassociations were observed only between high RGS and HR for NAFLD in the regular exercise group (HR, 0.40;95% CI, 0.22–0.72). Furthermore, in all subjects, both the high RGSon-regular exercise and high RGS/regular exercise groups showed a respective 60% (HR, 0.40; 95% CI, 0.29–0.56) and 54% (HR, 0.44; 95% CI, 0.31–0.63)lower HR for NAFLD compared to the low RGSon-regular exercise group. Conclusion This study investigates that high level of RGS were independently associated with reducing risk of developing NAFLD. RGS is an important factor that can predict the risk of developing NAFLD, and regular exercise participation is essential for increasing RGS.

Purpose: Our primary aim was to elucidate the joint association between relative grip strength (RGS) and regular exercise participation with non-alcoholic fatty liver disease (NAFLD) incidence, utilizing longitudinal data. Methods: A total of 1,702 participants in this study comprised general adults aged 51 to 88 years, who had engaged in the survey both in 2013 to 2018 and during the subsequent follow-up in 2019 to 2020. NAFLD were determined by using the hepatic steatosis index. RGS was determined using the JAMA-5030J1 equipment (SAEHAN). To validate the relationship between the interaction of RGS and regular exercise participation and its impact on risk of developing NAFLD, a proportional hazards Cox regression model was used. Subsequently, we computed the hazard ratio (HR) and 95% confidence interval (95% CI) for NAFLD. Results: In the non-regular exercise group, middle RGS and high RGS reduced the HR for NAFLD by 29% (HR,0.71; 95% CI, 0.51–0.99) and 78% (HR, 0.22; 95% CI, 0.13–0.35), respectively, compared to low RGS. Significantassociations were observed only between high RGS and HR for NAFLD in the regular exercise group (HR, 0.40;95% CI, 0.22–0.72). Furthermore, in all subjects, both the high RGSon-regular exercise and high RGS/regular exercise groups showed a respective 60% (HR, 0.40; 95% CI, 0.29–0.56) and 54% (HR, 0.44; 95% CI, 0.31–0.63)lower HR for NAFLD compared to the low RGSon-regular exercise group. Conclusion This study investigates that high level of RGS were independently associated with reducing risk of developing NAFLD. RGS is an important factor that can predict the risk of developing NAFLD, and regular exercise participation is essential for increasing RGS.

Purpose: Our primary aim was to elucidate the joint association between relative grip strength (RGS) and regular exercise participation with non-alcoholic fatty liver disease (NAFLD) incidence, utilizing longitudinal data. Methods: A total of 1,702 participants in this study comprised general adults aged 51 to 88 years, who had engaged in the survey both in 2013 to 2018 and during the subsequent follow-up in 2019 to 2020. NAFLD were determined by using the hepatic steatosis index. RGS was determined using the JAMA-5030J1 equipment (SAEHAN). To validate the relationship between the interaction of RGS and regular exercise participation and its impact on risk of developing NAFLD, a proportional hazards Cox regression model was used. Subsequently, we computed the hazard ratio (HR) and 95% confidence interval (95% CI) for NAFLD. Results: In the non-regular exercise group, middle RGS and high RGS reduced the HR for NAFLD by 29% (HR,0.71; 95% CI, 0.51–0.99) and 78% (HR, 0.22; 95% CI, 0.13–0.35), respectively, compared to low RGS. Significantassociations were observed only between high RGS and HR for NAFLD in the regular exercise group (HR, 0.40;95% CI, 0.22–0.72). Furthermore, in all subjects, both the high RGSon-regular exercise and high RGS/regular exercise groups showed a respective 60% (HR, 0.40; 95% CI, 0.29–0.56) and 54% (HR, 0.44; 95% CI, 0.31–0.63)lower HR for NAFLD compared to the low RGSon-regular exercise group. Conclusion This study investigates that high level of RGS were independently associated with reducing risk of developing NAFLD. RGS is an important factor that can predict the risk of developing NAFLD, and regular exercise participation is essential for increasing RGS.

Purpose: The purpose of this study was to identify the associations between type of moderate-vigorous physical activities (MVPA) and psychological stress in South Korean, based on the Korean Genome and Epidemiology Study. The subjects of this study were 2,891 Korean men and women aged 40 to 69, who completed health examination from 2011 to 2012. Methods: The type of MVPA was measured by using self-reported physical activity questionnaire. A high psychological stress was determined by scoring Psychological Well-being Index Short Form (≥ 27). Logistic regression analysis, adjusting other confounding factors, was conducted to identify the association of type of MVPA level with psychological stress (p＜ 0.05). Results: Participants who leisure-related MVPA of ≥ 150 min/week was less likely have to high psychological stress than ＜ 150 min/week (odds ratio [OR], 0.72; 95% confidence interval [CI], 0.57–0.92). From the analysis of gender, leisure-related (OR, 0.50; 95% CI, 0.35–0.72) and work-related (OR, 0.63; 95% CI, 0.41–0.97) MVPA of ≥ 150min/week were associated with low psychological stress in men, but women was not significantly associated. From the analysis of age, leisure-related MVPA of ≥ 150 min/week were associated with low psychological stress in middle age group (OR, 0.70; 95% CI, 0.53–0.92), but elderly group was not significantly associated. Differences inpsychological stress OR according to type of MVPA time were observed about classification of occupations. Conclusion High level of leisure related physical activity were independently associated with reducing risk for psychological stress. Also, encouraged MVPA by gender, age, classification of occupations could help to improve psychological stress levels in middle-aged or older adults.