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MSM의 경피 도포가 편심성 운동에 따른 근손상 발현 및 회복에 미치는 영향
조현덕 ( Hyeon-deok Jo ),김춘섭 ( Choun-sub Kim ),김맹규 ( Maeng-kyu Kim ) 한국운동생리학회(구 한국운동과학회) 2021 운동과학 Vol.30 No.2
PURPOSE: The present study aimed to investigate the effects of transdermal application of methylsulfonylmethane (MSM) on muscle damage and recovery following eccentric exercise in young men. METHODS: Eleven college-aged men without any cardiovascular or orthopedic disorders underwent two sessions consisting of a control session (CS) and an experimental session (ES) in a random order with at least 2 weeks of wash-out between the sessions. The participants performed 30 maximal eccentric exercises involving their non-dominant elbow flexors in each session. Circumference, muscle soreness, range of motion, maximal voluntary isometric contraction (MVIC), and muscular echo intensity (EI) were measured to evaluate the changes in the level of exercise-induced muscle damage (EIMD). All measurements were performed at 24, 48, 72, and 96 hours after exercise and also immediately before and after exercise. RESULTS: Transdermal application of MSM in ES attenuated muscle swelling and decreased MVIC after eccentric exercise when compared with CS. Muscle soreness and EI tended to increase less rapidly and decrease more rapidly in ES than in CS. CONCLUSIONS: Transdermal application of MSM may induce relatively positive effects on EIMD and recovery following eccentric exercise when compared with the treatment that has been widely used previously.
수온 차이에 의한 하이드로테라피 적용이 편심성 운동 후 근손상 발현 및 회복에 미치는 영향
조현덕 ( Hyeon-deok Jo ),김춘섭 ( Choun-sub Kim ),김맹규 ( Maeng-kyu Kim ) 한국운동생리학회 2021 운동과학 Vol.30 No.3
PURPOSE: This study aimed to examine the effect of hydrotherapy at different temperatures following eccentric exercise on muscle damage and recovery profiles in young men. METHODS: Male college students without any cardiovascular or orthopedic disorders were randomly assigned to three hydrotherapy groups: a 5°C group (cold water, COLD), a 15°C group (cool water, COOL), and a control group (CON). Thirty maximal eccentric exercises were performed using the participants’ nondominant elbow flexor muscles. Each treatment consisted of immersion five times for 1 minute, along with a 1-minute rest between each immersion trial. Each intervention was conducted immediately after the eccentric exercise and every 24 hours. Changes in the level of exercise-induced muscle damage (EIMD), circumference, muscle soreness, range of motion (ROM), maximum voluntary isometric contraction (MVIC), muscle dynamic stiffness, and muscular echo intensity (EI) were measured. All parameters were measured at 24, 48, 72, and 96 hours after exercise, as well as immediately before and after exercise. RESULTS: Muscle soreness was significantly higher in the COLD group than in the other groups. Moreover, the muscle circumference tended to increase in the COLD group than in the other groups. However, an increase in the dynamic stiffness and EI, promoting the recovery of MVIC, was observed in the COOL group. In addition, ROM tended to return more rapidly in the COOL group than in the other groups. CONCLUSIONS: This study suggests that hydrotherapy at moderately low temperatures compared with that at extremely low temperatures may induce relatively positive effects on EIMD and recovery phases following eccentric exercise in the arms.
조현덕,김진섭,이종현,이정희,박세일,권성원,Jo, Hyeon-Deok,Kim, Jin-Seop,Lee, Jong-Hyeon,Lee, Jeong-Hui,Park, Se-Il,Gwon, Seong-Won 대한전자공학회 2001 電子工學會論文誌-SD (Semiconductor and devices) Vol.38 No.10
교류의 실용 표준기로 사용하기 위해 TC 1에서 TC 6까지 6개의 평면형 열전변환기를 설계 및 제작하였다. 공기중 및 진공중의 전압 감응도는 TC 6의 경우 열손실이 가장 작아 약 4.03 mV/mW 및 약 6.38 mV/mW의 가장 큰 값을 나타내었다. 열시정수는 히터의 열관성이 가장 부족한 TC 6을 측정하여 약 8 ms를 얻었다. FRDC(fast reversed DC) 방법에 의한 교류-직류 전압 및 전류 변환오차는 40 Hz∼10 ㎑ 주파수 범위에서 1 V 및 5 mA의 정현파 실효전압 및 실효전류를 인가하였을 때 약 ±0.41∼±0.85 ppm 및 약 ±0.15∼±1.16 ppm으로서 실용표준으로 사용하기에 적합하였다. Six types of planar thermal converters from TC 1 to TC 6 were designed and fabricated for the purpose of being used as practical standards to alternating current. The respective voltage responses in air and in a vacuum of TC 6, which has the smallest thermal loss, were about 4.03mV/mW and about 6.38 mV/mW. Thermal time constant of TC 6, which has also the smallest heater thermal inertia, was about 8 ms. The respective variations of AC-DC voltage and current transfer errors from sample to sample, which were measured by FRDC(fast reversed DC) method, were about $\pm$0.41 ~$\pm$0.85 ppm and about $\pm$0.15~$\pm$1.16 ppm in the frequent range of 40 Hz~10 KHz with appling 1 V and 5 mA rms sine waves to the converters. All converters investigated exhibited sufficiently low AC-DC transfer errors to be used as practical standards.