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등척성수축으로 근피로 유발 후 스트레칭과 마사지가 근수축력 회복에 미치는 영향
이종대,배준호,배성수,Lee, Jong-Dae,Bae, Jun-Ho,Bae, Sung-Soo 대한물리치료학회 2006 대한물리치료학회지 Vol.18 No.1
Purpose: The present study purposed to examine the effects of massage and stretching on the recovery of muscle contraction force for muscle fatigue caused by sustained isometric contraction. Methods: The subjects of this study Were 64 healthy men and women (women: 30, men: 34). They Were divided into massage group (23), stretching group (21) and rest group (20), and using Biodex System we observed the pattern of changes in maximal voluntary contraction force (MVC) after causing muscle fatigue in quadriceps femoris muscle through sustained isometric contraction. Results: We measured the point of fatigue occurrence by sustained isometric contraction with 50% MVC and changes in isometric contraction force at 0, 10, 20 and 30 minutes after fatigue and compared them according to gender and treatment group. Conclusion: 1. According to the result of measuring the point of time when fatigue occurred, a difference was observed in time to task failure between men and women. It was significantly longer in women. 2. By gender, MVC changed significantly in all time frames in women, but it showed significant increases only at 10 minutes after fatigue in men. 3. In the comparison of MVC among the treatment groups, it showed significant differences among the groups at 10 minutes after fatigue. 4. In the comparison of changes in MVC among the time frames for each group, the rest group showed significant differences in MVC between 0 and 10 minutes after fatigue and between 20 and 30 minutes after fatigue. The massage group showed significant differences in MVC between 0 and 10 minutes after fatigue and between 10 and 20 minutes after fatigue. The stretching group showed a significant difference in MVC between 10 and 20 minutes after fatigue and between 20 and 30 minutes after fatigue.
이종대,최창균 ( Jong Dae Lee,Chang Kyun Choi ) 한국화학공학회 1992 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.30 No.6
In experimental electroplating copper ion on copper electrodes from CuSO₄-H₂SO₄solution, the limiting current technique was used in order to investigate the critical time of natural convection and characteristics of mass transfer. A correlation of the critical time vs. the Rayleigh number was depicted experimentally for 2000≤Sc≤3000 and 10^8≤Ra≤10^(12). It is found that experimental values of the critical time are about four times larger than theoretical values in the isothermal heating system. This trend is consistent with that of heat transfer. The present mass transfer correlation represents favorably not only the experimental data of this study but also the existing experimental data.