• 대한의용생체공학회:의공학회지
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• 제32권2호
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• pp.93-104
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• 2011

The purpose of this study was to investigate lower-limb joint torque of the two groups as it changed by somatosensory stimulation during the descent down three stairs of different heights and to describe the difference between the two groups, which are young people group and elderly people group. Subjects of each groups climbed down a stair at four stimulation conditions, which are non-stimulation, tibialis anterior tendon stimulation, achilles tendon stimulation, tibialis anterior - achilles tendon stimulation. Motion capture data were collected using 3D optoelectric motion tracking system that utilizes active infrared LEDs, near infrared sensor and force plate. The obtained motion capture data was used to build 3D computer simulation model. The results show that lower-limb joint torque of the two groups changed with somatosensory stimulation as they descended the stairs and the joint torque of the two groups differed from each other.

• The Journal of Korean Physical Therapy
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• 제14권2호
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• pp.162-171
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• 2002

본 연구는 고전압맥동전류자극이 생검 건의 세포 이동 및 증식의 증진 여부를 규명하기 위하여 시행하였다. 닭의 심지굴근건을 적출하고 직경 2mm의 생검하여 배양하였다. 생검 건에 100 pps, 50V로 30분간 음극으로 고전압맥동전류자극한 후 생검 건을 피브린로 피복하고 6일간 배양한 후 세포의 이동거리를 측정하고 7일 후 세포증식능을 측정하였다. 대조군과 고전압맥동전류자극군의 세포 이동 거리 및 흡광도를 t-검정한 결과 고전압맥동전류자극군의 세포 이동 거리가 유의하게 증가하였으며 (t=-2.675, p<0.05), 흡광도도 유의하게 증가하였다 (t=-2.136, p<0.05). 이러한 결과는 고전압맥동 전류자극이 생검 건 섬유모세포의 성장과 증식을 유발시키고 있음을 보여주고 있으며, 이러한 결과는 고전압맥동전류자극이 섬유모세포의 세포반응을 활성화시켰음을 시사하고 있어 고전압맥동전류자극의 건손상 치유 기전의 일부를 제시하였다.

• 한국정밀공학회:학술대회논문집
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• 한국정밀공학회 2013년도 춘계학술대회 논문집
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• pp.1421-1422
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• 2013

• 대한의용생체공학회:의공학회지
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• 제32권1호
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• pp.61-73
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• 2011

The purpose of this study was to investigate changes in the center of pressure (COP), ground reaction force (GRF) and joint angles of elderly people and young people while stair-descent. The participants in this experiment were 5 elderly people and 5 young people, each of which was asked to descend stairs of three different heights (8 cm, 16 cm, and 32 cm). As they climbed down the stairs, they received vibration stimulation on the lower limb. The change of COP, GRF and joint angles were analyzed during the standing phase. COP decreased as the Achilles tendon and tibialis anterior tendon were vibrated. Vertical GRF increased as the Achilles tendon was vibrated, and the joint angle differed according to vibration stimulation conditions. These results mean that ankle joint, knee joint and hip joint were influenced by the vibrations on the lower limb as the participants descended the stairs. It was concluded that the vibration stimulation on the lower limb allowed the participants to efficiently climb down the stairs.

• 대한의용생체공학회:의공학회지
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• 제40권2호
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• pp.68-74
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• 2019

Lateral epicondylitis is caused by repeated use of the wrist, which causes inflammation and pain in the wrist extensor and tendon of the humerus. Delayed onset muscle soreness (DOMS) caused by repetitive resistance exercise affects the tendons connected in series with the muscle, leading to lateral epicondylitis. Although micro-current stimulation has been suggested as a possible treatment for tendinitis, there are insufficient studies on specific variables such as frequency. In this study, 15 healthy adult males and females developed DOMS in the wrist extensor and tendon in the humerus. The experimental group consisted of a low frequency group applying 20 Hz and a high frequency group applying 100 Hz according to the micro-current frequency. Each subject underwent an experiment for 5 days after DOMS, and the recovery rates were compared by measuring AROM, GPT, MST, PPT, and VAS. As a result, the 20 Hz group showed significant changes in AROM, MST, and VAS compared to the control group on the 4th day, and the recovery rate was also higher than that of the 100 Hz group. On the 5th day, recovery rate of 100 Hz group was higher than 20 Hz in AROM and PPT, and MST showed higher recovery rate than 20 Hz group, but there was no significant difference. These results indicate that microcurrent stimulation is effective for the treatment of delayed myalgia and tendon inflammation and that the 100 Hz group has faster recovery than the 20 Hz group.

• 대한의용생체공학회:의공학회지
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• 제30권6호
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• pp.521-528
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• 2009

This study is about to evaluation of postural stability according to characteristics of electrical stimulation on the ankle muscles. We measured body sway(center of pressure, COP) when various parameters of electrical stimulation was applied to ankle muscles in stable and unstable posture. Subjects consisted of 10 young adults, and electrical stimulation was delivered on right and left of tibialis anterior and Achilles tendon. The body sway was measured during electrical stimulation of three duty cycle and frequencies in stable posture and three amplitudes of sensory threshold in unstable posture. Consequently, the COP Shift is higher during electrical stimulation of 1/30(duty ratio) and 100Hz(frequency) in stable posture. In unstable posture, 100% amplitude of sensory threshold induced postural stability. These findings are important for the rehabilitation system of postural stability and the use of electrical stimulation as somatosensory information.

• 대한정형외과스포츠의학회지
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• 제5권1호
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• pp.81-84
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• 2006

Rupture of the rectus femoris at the musculotendinous junction is very rarely reported in the literature, especially which is caused by chronic repetitive stimulation. A 21 year old soldier complained of progressing right thigh pain and mass for 8 weeks after military training. MRI of the right thigh showed inhomogenous mass lesion suspecting soft tissue tumor. However ultrasonographic examination showed torn retracted rectus femoris tendon at musculotendinous junction. One year after primary repair of ruptured tendon, the patient is free from symptoms and returned to full previous activities. Knowledge of this sonographic and MRI finding will help the surgeon to diagnose and treat this rare injury.

• 대한약침학회지
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• 제6권2호
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• pp.159-164
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• 2003

Results : 1. The most important concept of IMS is chronic pain illness that may develop into hypersensitivity of the nerves, i.e., neuropathy. 2. Muscle shortening may be triggered by stress, including emotional, physical, external, and internal factors. 3. Muscle shortening increases mechanical tension on the muscles as well as inducing abrasion of the tissues by stretching ligament, tendon, cartilage, bone, and etc. 4. Pain from neuropathy is normally manifested on musculoskeletal system and spasm or shortening play as the central axis of this pain. 5. Neuropathy often appears at the nerve root level and the most important decisive factor of radiculopathy is muscle shortening. 6. Spondylosis is the most common cause of radiculopathy. 7. The most significant treatment principle of IMS is to relieve muscle shortening and remove stimulating determinant from the vertebrae. 8. Dry needling is quite effective for treating various pain caused by muscle shortening.

• 대한수의학회지
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• 제37권4호
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• pp.863-873
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• 1997

Electrical stimulation and vitamin $AD_3E$ administration have been shown to enhance the repair of biological tissues such as bone, ligament and tendon, The objective of this study were (a) to investgate the therapeutic effects of different levels of electrical stimulation and vitamin $AD_3E$ administration on fracture healing in a rat model and (b) to identify the most effective voltage level. Ninety Sprague-dawley rats were divided into electrical stimulation group and vitamin $AD_3E$ administration group. Electricla stimulation group was divided into four groups on the basis of the level of current delivered. The experimental groups received current (which varied by group), while the controls, with identical electrodes, received no current. In vitamin $AD_3E$ administration group, experimental group was injected 2,500 IU of vitamin A, 1,250 IU of vitamine $D_3$, 1mg of vitamine E intramuscularly. And in control group 0.1ml of saline was injected intramuscularly. After time periods (7-day, 14-day, 21-day for stimulation all rats were tested with combination of biochemical, roentgenologic and histomorphological methods. The results obtained were as follows ; In electrical stimulation groups, serum calcium and inorganic phosphorus level of experimental and control groups showed non specific change within normal physiological ranges. In vitamin $AD_3E$ administration group, serum calcium level of experimental and control groups showed non specific changes within normal physiological ranges, while experimental group showed slightly higher serum inorganic phosphorus level. According to roentgenologic and histomorphological examination, 2V 25Hz electrical stimulation group and vitamine $AD_3E$ administration group showed statistically significant improvements in bone density and ossification reaction until day 14. The terapeutic effect of stimulation on fracture healing was similiar to that of vitamin $AD_3E$ administration. In this study stimulation of 2V 25Hz was the most effective level of electrical stimulation for the healing of fracture of rats.

• 한국콘텐츠학회논문지
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• 제20권9호
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• pp.520-530
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• 2020

본 연구의 목적은 작업기반 양측성 상지 훈련과 경 두개 직류 전류 자극이 뇌졸중 환자들의 상지기능에 미치는 효과를 알아보는 것이었다. 만성 뇌졸중 환자를 대상으로 작업기반 양측성 상지훈련과 경두개 직류전류자극을 실시한 실험군 13명, 작업기반 양측성 상지훈련만 실시한 대조군 13명으로 나누어 총 4주간, 50분씩, 주 5회 실시하였으며, 캐나다 작업수행 평가(Canadian Occupational Performance Measure;COPM), 가속도계 (Accelerometer), 퍼글 마이어 검사(Fugle-Meyer Assessment;FMA), 운동 홛동 척도(Motor Activity Log;MAL)를 사용하여 평가하였다. 연구 결과, 실험군과 대조군은 작업 만족도와 수행도, 환측과 건측의 사용량, 상지 기능의 회복과 움직임의 질에서 모두 유의미한 개선을 보였으며, 특히, 환측 사용량에서 실험군은 대조군 보다 유의한 차이를 나타냈다. 따라서 작업기반 양측성 상지 훈련과 경 두개 직류 전류 자극의 결합 중재가 뇌졸중 환자의 상지기능회복에 긍정적인 효과를 보임을 알 수 있었다.