• The Transactions of The Korean Institute of Electrical Engineers
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• v.66 no.11
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• pp.1628-1633
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• 2017

The purpose of this study was to identify the difference and correlation in elbow joint maximal flexion strength according to measurement methods and characteristics of muscular contraction, and to develop the predictive equation of elbow joint maximal flexion strength for the optimal exercise intensity setting and accurate measurement. Subjects were 30 male university students. Elbow joint maximal flexion strength of isokinetic contraction, isometric contraction at $75^{\circ}$ elbow joint flexion position, isotonic concentric 1RM, manual muscle strength (MMT) were measured with isokinetic dynamometer, dumbbell, and manual muscle tester. Pearson's r, linear regression equation, and multiple regression equation between variables were calculated. As a result, the highest value was isometric contraction. The second highest value was MMT. The third highest value was isokinetic contraction. 1RM was the lowest. Predictive equations of elbow joint maximal flexion strength between isometric and isokinetic contraction, between isometric contraction and 1RM, among isometric contraction, 1RM, and body weight were developed. In conclusion, 1RM and isokinetic elbow joint maximal flexion strength could be seemed to underestimate the practical elbow joint maximal flexion strength. And it is suggested that the developed predictive equations in this study should be useful in criteria- and goal-setting for resistant exercise and sports rehabilitation after elbow joint injury.

• Journal of The Korean Dental Society of Anesthesiology
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• v.14 no.3
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• pp.151-155
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• 2014

Background: Dexmedetomidine is known to be administered for sedation safely even in a very elderly patient. The purpose of this study was to determine the effect of age on clinically optimal dose of dexmedetomidine for sedation. Methods: We enrolled 50 patients ASA class I and II, scheduled for lower extremity surgery that need. They were classified into a young group (n = 26), aged below 75 and an old group (n = 24), aged above 75. Dexmedetomidine was continuously infused $0.5{\mu}g/kg$ within 10 min, followed by maintenance at a dose of $0.5{\mu}g/kg/min$, initially. The next dose was selected using the Dixon's up-and-down method. Results: The cED50 of dexmedetomidine required to maintain optimal sedation level in young and old group were 0.50 and $0.48{\mu}g/kg$, respectively. With isotonic regression, cED95 of dexmedetomidine was $0.71{\mu}g/kg$ (95% confidence intervals $0.57-1.06{\mu}g/kg$) and $0.58{\mu}g/kg$ (95% confidence intervals $0.51-0.67{\mu}g/kg$). There were no significant differences in cED50 (P = 0.21), recovery variables, or incidence of side effects between the two groups. Conclusions: Clinically optimal dose of dexmedetomidine was not affected to the age during sedation.