• 한국운동역학회지
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• 제26권3호
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• pp.265-272
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• 2016

Objective: The aim of this study was to analyze X-factor, triple X-factor, and the center of pressure (COP) according to the feel of golf driver swing. Method: For this research, 9 golfers from the Korea Professional Golfers' Association (age: $30.11{\pm}2.98yrs$, height: $178.00{\pm}8.42cm$, weight: $76.22{\pm}8.42kg$, experience: $10.06{\pm}3.11yrs$) were recruited to participate in the experiment. Twelve Motion Analysis Eagle-4 cameras were installed and an image analysis was conducted by using the NLT (non-linear transformation) method, and 2 units of Kistler type 5233A dynamometer were used to measure ground reaction force. The sampling ratio was set at 1000 Hz. The golfers each took 10 swings by using their own driver, and chose the best and worse feel from among 10 shots. A paired-sample t-test was used to analyze the results. Results: In regard to feel, no change in head speed, X-factor, and the triple X-factor's X-factor stretch, hip rise, and head swivel, was observed (p>.05). Regarding ground reaction force, a difference was observed between the top of the backswing (p<.05) and impact (p<.05) in the vertical force of the left foot. For COP, a difference was also observed between the mid backswing (p<.001), late backswing (p<.001), and top of the backswing (p<.05) for the right foot X-axis and Y-axis mid follow through (p<.01). Conclusion: It can be reasoned that, irrespective of feel, the head speed, X-factor and triple X-factor's X-factor stretch, hip rise and head swivel did not have an effect on drive distance for domestic golfers, and the vertical reaction force of the left foot and left-right movement span's pressure dispersal of the right foot had an increasing effect on drive distance.

• 융합보안논문지
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• 제14권1호
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• pp.51-57
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• 2014

본 연구는 공수도의 대련경기 기술을 통해 경호대상자를 보호하는 완전한 임무수행을 할 수 있으므로 공수도 수련의 필요성을 인식시키고, 공수도의 가치는 높이는데 목적이 있다. 공수도 대련경기 기술은 손기술, 발기술, 던지기기술로 구분된다. 첫째, 손기술이다. 위해자가 경호대상자를 공격시 가벼운 스텝으로 위해자의 주요급소 부위에 앞손치기 또는 뒷손치기가 효과적으로 상대를 제압할 수 있고, 직선공격이 쉽지 않을 경우 돌려치기로 상대를 제압할 수 있다. 둘째, 발기술이다. 위해자가 경호대상자를 공격시 거리와 방향에 따라 위해자의 주요급소를 향해 앞차기, 옆차기 뒷차기의 직선적인 공격과 앞돌려차기, 앞후리기, 뒤후리기의 곡선적 공격으로 위해자를 제압할 수 있다. 마지막으로 던지기 기술이다. 손과 다리 그리고 상대의 균형을 이용한 기술로 걸기와 후리기로 무너뜨리고, 손과 발기술로 상대의 급소를 공격하면 완전히 제압된다. 공수도 대련경기기술은 손기술과 발기술 그리고 던지기 기술의 각각의 기술로 위해자를 제압할 수 있지만 다양한 장소와 거리 등 환경에 의해 손기술과 발기술, 발기술과 손기술, 손기술와 던지기 기술, 발기술과 던지기 기술, 던지기 기술과 발 또는 손기술 등 다양하게 습관적으로 대련 경기에서 나오고 있다. 이러한 공수도는 경호무도로서 이상적이라 볼 수 있다.

• 한국운동역학회지
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• 제28권1호
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• pp.37-43
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• 2018

Objective: The aim of this study was to analyze muscle activation of the lower extremities as a function of changes of the center of pressure (CoP) of the foot during squats in order to provide quantitative information to trainers who would like to teach correct movements for developing muscles. Method: Ten men with over three years of weight training experience participated in this study (age: $26.1{\pm}0.8yrs$, height: $171.2{\pm}3.9cm$, body mass: $71.1{\pm}5.7kg$, 60%RM: $84{\pm}9kg$, career: $4.0{\pm}0.7yrs$). The participants were instructed to perform a squat in each of 3 conditions, with different CoP's (the front, middle, and rear of the foot). Results: The position of the CoP showed significant differences according to instructions in both the eccentric and concentric contraction phases (p < .05). The range of movement of the hip and ankle joints showed significant differences corresponding to changes of the CoP position (p < .05). The rectus femoris and gluteus maximus muscle showed significant differences for different CoP positions only in the concentric contraction phase, while the gastrocnemius and anterior tibialis were significantly different in both the concentric and eccentric contraction phase (p < .05). Conclusion: When the target muscle of squat training is the gastrocnemius, the CoP should be located in the front of the foot for effective muscle training. When the target muscles of squat training are the gluteus maximus and quadriceps femoris, the CoP should be located on the rear of the foot.

• Physical Therapy Rehabilitation Science
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• 제13권2호
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• pp.205-212
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• 2024

Objective: The purpose of this study is to confirm the exercise effect when combining wearable exercise assist robot, Bot fit's resist mode (Samsung Electronics) and stair climbing. Design: Cross-section study Methods: Targeting 53 adults and seniors, foot pressure and muscle activity were measured when climbing 3-story stairs using foot pressure measurement equipment (W-insole Science System) and surface muscle activity measurement equipment (sEMG; FreeEMG, BTS Bioengineering, Italy) using Bot Fit's resist mode. All subjects were measured without wearing Bot Fit, and the data between the two conditions were compared and analyzed. Results: The front area(p<0.01) and middle area(p<0.05) foot pressures of adults significantly increased when wearing the Bot fit. Frontal area foot pressure significantly increased in elderly people with knee arthritis and obesity(p<0.05). The gastrocnemius activity in all subjects significantly decreased after wearing Bot Fit(p<0.01). In elderly people with knee arthritis, the muscle activity of the rectus femoris was significantly reduced(p<0.05)., and in obese elderly people, the muscle activity of the gastrocnemius muscle was significantly reduced(p<0.05). Conclusions: Based on the results of this study, it is possible to induce correct stair climbing posture when climbing stairs using Bot fit resistance mode. In particular, it is expected to be an effective exercise for strengthening muscle endurance by increasing the activity of the rectus femoris muscle.

• 한국방사선학회논문지
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• 제18권4호
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• pp.327-334
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• 2024

본 연구의 목적은 당뇨병 환자의 맞춤형 족부질환 분석 및 관리 시스템 개발로 당뇨병성 족부질환 환자의 발 궤양 예방본 시스템은 영상분석 기술을 활용하여 족압뿐만 아니라, 발목의 변형, 신체의 균형, 발의 상처 여부 등의 다양한 데이터를 통하여 정확한 족부변형 상태 분석이 가능하고, 이를 기반으로 당뇨병성 족부질환 환자의 발의 정확한 변형 상태를 파악하여 맞춤형 인솔 제작을 하였다. 당뇨병 족부질환의 상처를 상태 확인 애플리케이션(App)의 사용 만족도 검사와 당뇨병성 족부질환 환자 및 족부질환 환자의 변성 상태를 파악하여 맞춤형 인솔을 착용하여 인솔 착용 만족도 조사연구이다. 연구 결과로 족저압력 측정 Knee angle은 -0.8 ± 1.3도였으며 최소 -2.4도에서 최대 1.1도의 분포를 보였고, 외반슬은 양쪽 하지 간에 유의미한 차이가 없었다(p = 0.534). 경골 각도는 양쪽 하지에 유의미한 차이가 있었다 (p < 0.001). 발목 각도(Ankle angle)는 왼쪽이 2.6 ± 2.0도였으며 최소 0도에서 최대 6.3도의 분포를 보였고, 오른쪽은 4.5 ± 2.1도였고 최소 1.5도에서 최대 9.1도의 분포를 보였다. 발목 각도는 양쪽 하지에 유의미한 차이가 있었다 (p = 0.011). 족저 압력 측정 애플리케이션에 평균 4.3점의 만족도를 느낀다고 응답하였으며. 맞춤형 인솔 사용에 대해 평균 3.9점의 만족도를 느낀다고 응답하였다.

• 대한족부족관절학회지
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• 제25권1호
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• pp.46-49
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• 2021

Acute compartment syndrome occurs when pressure increases within closed compartments due to injuries causing soft tissue damage. Delayed treatment can lead to undesirable consequences. This paper reports a three-year-old patient in whom a fasciotomy was performed successfully despite the potential side effects. Fasciotomy may be considered when the diagnosis and clinical symptoms of delayed compartment syndrome are clear. This study determined that the three-year-old patient would undergo a relatively smooth recovery compared to elderly patients of advanced age. Because the dorsalis pedis artery pulse was palpable, an emergency surgical treatment was performed to restore the damaged tissues and prevent further necrosis. The patient has shown a satisfactory recovery.

• 한국운동역학회지
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• 제22권1호
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• pp.113-121
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• 2012

The purpose of this study was to evaluate the effects of forefoot rocker shoes equipped with a metatarsal bar on lower extremity muscle activity and plantar pressure distribution. Ten healthy women in the age of twenties were participated in this study as the subjects. All subjects walked on a treadmill(Gait Trainer, BIODEX, USA) wearing normal shoes and metatarsal bar shoes, during which the plantar pressure distribution and muscle activity were measured. Using Pedar-X system(Novel Gmbh, Germany), the plantar pressure was measured for six regions of the foot: forefoot, midfoot, rearfoot, 1st metatarsal, 2-3th metatarsal, and 4-5th metatarsal, and for each sub-region, 4 features such as maximum force, contact area, peak pressure, and mean pressure were analyzed based on the plantar pressure. EMG(Electromyography) activity was measured by attaching surface electrodes to the rectus femoris, biceps femoris, tibialis anterior, and gastrocnemius medial head, and magnitude of muscle contraction was analyzed in IEMG(Integrated EMG) value. The results show that the maximum force, contact area, peak pressure, and mean pressure in the midfoot all increased while maximum force, peak pressure, contact area, mean pressure in the 1st metatarsal and 2-3th metatarsal all decreased when wearing functional shoes. Also, muscle activities in the four muscles were all decreased when wearing the functional shoes. This paper suggests that forfoot rocker shoes equipped with a metatarsal bar can help disperse the high pressure and absorb the shock to the foot as well as give positive influence on gait pattern and postural stability by reducing muscle fatigue during walking.

• 대한족부족관절학회지
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• 제8권1호
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• pp.16-21
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• 2004

Purpose: To investigate the characteristics of the patients and therapeutic shoes for diabetic patients. Materials and Methods: Forty two diabetic patients who had their own therapeutic shoes which were prescribed somewhere else were studied from March 2003 to December 2003. There were 27 males and 15 females, and the mean age was 62.1 years (range, 49-72 years). Duration of diabetes was average 14 years (range, $6{\sim}30$ years), all had type 2 diabetes. Sensation was examined with 5.07 nylon monofilament. The route of purchasing the shoes, compliance to the prescribed shoes were investigated by interview. The shape of shoe, stiffness of upper, conformity of insole to the shape of the foot were recorded. In-shoe plantar pressure was measured in 15 patients. Results: Eighteen patients were insensate to the monofilament. Seven patients did not wear the therapeutic shoes, and only 18 of 35 patients were wearing the therapeutic shoes more than 6 hours a day. The shoes of 17 patients were prescribed by medical doctor and the rest were purchased by the recommendation of acquaintances or advertisement. Ulcer recurred in four of five patients to whom the shoe was prescribed by medical doctor and the cause of three recurrences were evident by just observing the foot and shoe. The therapeutic shoes were made from 11 different makers. Eight shoes were adequate for diabetic patients with respect to the material, shape of insole, type of shoe. In-shoe plantar pressure was examined in 15 patients and was less than 300 kPa in all patients. Conclusion: The therapeutic shoes for the diabetic patients need to be prescribed by medical doctor for selective patients with neuropathy or previous history of ulcer and follow-up examination is important to monitor the compliance of the patients and adequacy of the shoes.

• 한국산학기술학회논문지
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• 제20권9호
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• pp.20-28
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• 2019

본 논문은 지반 조건에 따라 현재 개발 중인 팽이기초를 접목한 신발과 일반적인 신발인 워킹화의 보행시 압력분포의 비교분석에 대한 연구이다. 일반적인 신발, 현재 개발 중인 팽이기초를 접목한 신발 두 가지 카테고리의 신발이 본 연구에 사용되었으며, 실험 대상은 260mm를 착용하는 정상발의 조건에 만족하는 15명의 20대 남성을 대상으로 단단한 지반, 모래 지반에서의 실험을 실시하였다. 보행 시 압력의 측정은 Techstorm사의 무선 Insole System 을 사용하여 측정하였으며 발의 7 Zone에서 족저압을 측정하였다. 연구 결과 신발과 지반 조건에 따라 다른 최대 힘, 평균 압력, 압력 분포도를 나타냈으며, 본 연구 결과 단단한 지반 및 모래 지반에서 발 부위에 따라 족저압 분산 효과가 일반적인 신발과 현재 개발 중인 팽이기초를 접목한 신발이 서로 상이한 것을 확인할 수 있었다. 향후 보다 지속적인 연구를 통해 다양한 고무 소재를 선택하여 추가적인 실험을 통해 단단한 지반 및 모래 지반에서 모두 착용 가능한 신발의 개발에 유용하게 사용될 것으로 기대된다.

• 한국산학기술학회논문지
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• 제22권5호
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• pp.403-410
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• 2021

류마티스 환자들이 수중운동을 하면 통증이 감소되는 등 긍정적인 효과가 발생되지만, 통증이 감소되는 원인은 확실치 않고 이에 대한 연구는 미비한 실정이다. 따라서 수중운동 시, 발 표면에 흐르는 유동을 분석해 통증이 감소되는 원리를 규명하고자 한다. 본 연구에서는 유동의 흐름을 분석하기 위해 Unsteady 해석을 진행하였으며, 다리를 들어 올리는 동작과 내리는 동작을 총 3회 반복설정하여 해석을 수행하였다. 또한 통증이 있는 부위에 압력점을 지정하여 압력변동 및 주파수를 분석했다. 그 결과 전반적으로 양압과 음압이 약 ±500Pa의 압력이 가해지고, 운동 방향을 전환할 때에는 약 ±2000Pa의 압력이 가해지는 것을 확인했다. 또한 류마티스 통증이 빈번하게 발생하는 부위에 약 35 ~ 80Hz 정도의 주파수가 발생하였다. 지속적인 압력변동과 주파수가 통증부위에 반복적으로 가해지면 혈액순환이 증진되고, 통증이 감소되는 효과를 예측할 수 있다. 본 연구의 결과는 수중운동의 효과 및 원리를 이해하는 자료로 활용이 가능할 것으로 사료되며, 수중운동의 프로그램 개발을 보조하고, 관련 의료 보조기 개발을 위한 기초 자료로 활용될 수 있을 것이다.