The purpose of this study was to investigate the validity of Borg's category ratio (CR) 10 scale during maximal-graded exercise testing (GXT) and to examine the factors associated with validity for ratings of perceived exertion (RPE) in Korean adults. METHODS: We recruited 720 adult participants over 20 years of age. we divided the participants based on their sex and further subdivided them into five-year age groups, with 40 participants in each group. After exclusion of participants whose VO2max measurements were invalid or inappropriately recorded, we had a total of 665 participants (327 male and 338 female). We measured the participants' height and body fat percentage. Physical activity and physical self-efficiency were surveyed. Steady-state heart rate, VO2, and ratings were record last 10 seconds in every stage and end of GXT. The collected data were analyzed by descriptive statistics, correlation analysis and regression analysis using STATA 10.0 SE statistics package. RESULTS: The CR 10 scale was strongly correlated with %HR max, %heart rate reserve (HRR) and %VO2max. Estimates for relative exercise intensity at each RPE can be calculated according to the equation %HRmax =50.251+8.351 ×RPE-.317 ×PRE 2 for male (r 2 =.779, p<.001) and, %HRmax=55.838+7.895×RPE-.332×RPE 2 for female (r 2 =.728, p<.001). The validity was relatively higher in males and younger group But there were no difference between physical fitness, vigorous physical activity, and physical self-efficiency. CONCLUSIONS: We found that Borg' CR10 is more effective than 15-scale RPE as a method of setting of exercise intensity in Korean adults.

BackgroundCardiac rehabilitation programs reduce the likelihood of relapse and cardiac arrest in patients with cor-onary artery disease. The goal of this study was to compare and analyze changes in cardiovascular risk factors and physical fitness in patients who participated in short-term (ST) and long-term (LT) cardiac rehabilitation programs following coronary artery percutaneous coronary intervention (PCI). MethodsThis study included 193 men aged ≥45 years who received PCI for coronary artery occlusive disease. The participants were divided into ST program participants (3 months, 108 participants; ST group) and LT program participants (12 months, 85 participants; LT group). Blood lipids analysis, body composition, and physical fitness tests were performed to assess cardiovascular risk factors and physical fitness. Paired t-test and two-way ANOVA with repeated measures were used to investigate the effect of the intervention. ResultsBoth groups had significant improvements after cardiac rehabilitation in body fat, high-density lipoprotein cholesterol, exercise duration, heart rate (HR) at rest, double product peak, VO2 peak, 6-min walking, and sit-to-stand, compared to baseline. The LT group also had significant improvements after cardiac rehabili-tation in waist circumference (WC), total cholesterol (TC), triglyceride (TG), and HR peak. LT group had significantly improved effect than ST group in WC, TC, TG, exercise time, HR peak, and 6-min walking. ConclusionThe cardiac rehabilitation program led to improved cardiovascular risk factors and physical fitness, and the LT program was more effective than the ST program.

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