Association of Hand Grip Strength and Physical Fitness Parameters in Middle-Aged and Older Korean Men

The purpose of this study was to assess whether hand grip strength (HGS) could be an effective indicator to estimate other physical fitness parameters in middle-aged and older men using large population data. Data for this study were obtained from the National Fitness Center operated by the Korea Institute of Sport Science (n = 429 572). The following were excluded from this study: women aged 44 years or younger (n = 238 257), repeated measurement data (n = 130 466), and errors or missing data (n = 6 497). The final sample included 54 352 participants (27 878 middle-aged and 26 474 older-aged). The highest overall physical fitness grade among participants was 5.6% (4.7%, middle-aged men; 6.6%, older men), the lowest was 52.1% (59.0%, middle-aged men, 43.9%, older men). HGS was positively correlated with flexibility (r = 0.183), muscular endurance (r = 0.354), and power (r = 0.463), in middle-aged men. In older men, flexibility (r = 0.227), and 30SCS (r = 0.385), were positively correlated; Timed Up and Go (r = -0.405), and F8W (r = -0.433), were negatively correlated. All physical fitness parameters were significantly higher in participants with normal HGS than those with low HGS. Our finding suggests that HGS is a predictive method for physical fitness variables and a useful biomarker for global public health.