• 재활복지공학회논문지
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• 제10권1호
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• pp.73-79
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• 2016

본 논문에서는 경부통증완화에 효과적인 맥킨지 운동(Mckenzie exercise)이 가능한 경부 재활로봇(cervical rehabilitation robot)을 제안한다. 이 로봇은 목의 좌우 측방굴곡, 전방향의 굴곡 및 후방향의 신전이 가능하도록 2자유도를 가지며, 맥킨지의 경부 스트레칭과 등척성 운동이 가능하다. 재활로봇의 기구부는 의자에 거치할 수 있어 가정에서 의자에 앉은 채로 맥킨지 운동을 할 수 있도록 설계하였다. 실험에서는 피험자가 프로토타입 경부 재활로봇을 착용하고 맥킨지 운동을 수행시 전후좌우의 굴곡과 신전 각도를 측정하고, 동시에 목주위의 표면 근전도와 머리부착부위의 압력을 측정하여 로봇의 성능을 평가하였다. 이 실험의 결과로부터 본 연구에서 제안한 경부 맥킨지 운동용 재활로봇이 적용가능함을 보였다.

• The Journal of Korean Physical Therapy
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• 제22권5호
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• pp.9-16
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• 2010

Purpose: The purpose of this study was to compare modified sling exercise and general isometric exercise in patients with shoulder impingement syndrome. Methods: Twenty subjects were studied. The control group, n1 = 10, received instructions for doing general isometric (ISO) exercise. An experimental group, n2 = 10, received instructions for doing push-ups from standing and sitting positions and modified scapular exercises using a sling (3 sets, 3 times per week for 6 weeks). To evaluate the effects of exercise, subjects were evaluated using a visual analog scale for pain, a goniometer for range of motion, and electromyography for onset time of muscle contraction. Statistical analysis was done using the Wilcoxon Signed rank and Mann-Whitney U tests. Results: Pain in the sling group was significantly decreased after 6 weeks of treatment (p<0.05) pain in the general ISO exercise group was not significantly decreased (p>0.05). Flexion and external rotation were significantly increased after 6 weeks of treatment in both groups (p<0.05) and the change in the Sling group was greater than in the ISO group (p<0.05) in the flexion test. Time of onset of contractions in the Sling group for the upper trapezius, lower trapezius and serratus muscle were significantly decreased after 6 weeks of treatment (p<0.05), but the onset time for the middle trapezius did not significantly decrease (p>0.05). Conclusion: Scapular stabilizing exercise using a sling increases range of motion and decreases pain, and onset time of muscle contraction in patients with impingement syndrome.

• 한국전자통신학회논문지
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• 제11권10호
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• pp.995-1002
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• 2016

본 연구의 목적은 스마트폰을 사용한 구강안면 운동 프로그램이 삼킴장애가 있는 급성 뇌졸중 환자의 삼킴기능과 혀 근력에 미치는 효과를 알고자 하였다. 본 연구는 삼킴장애가 있는 급성 뇌졸중 환자 16명을 대상으로 하였다. 연구에 참가한 모든 대상자들은 실험군과 대조군으로 8명씩 무작위 배정되었다. 두 그룹의 대상자들은 4주간 주 5회, 하루 30분의 보편적인 삼킴장애 치료를 받았다. 실험군은 스마트폰을 사용한 구강안면 운동 프로그램을 보호자의 감독 하에 추가적으로 30분씩 더 수행하였다. 결과측정은 흡인-침습 척도, 후두계곡 잔여물, 조롱박오목 잔여물, 혀의 최대 등척성 압력을 측정하였다. 연구 결과, 두 그룹은 중재 전과 후에 모든 평가에서 유의한 향상을 보였다(p<.05). 두 그룹 간 변화량 비교에서 실험군은 대조군보다 후두계곡 잔여물과 혀의 최대 등척성 압력에서 유의한 향상을 보였다(p<.05). 스마트폰을 사용한 구강안면 운동 프로그램은 삼킴장애가 있는 급성 뇌졸중 환자의 인두 내 잔여물 감소와 혀 근력 향상에 긍정적인 효과를 기대할 수 있는 중재방법으로 사료된다.

• 한국운동역학회지
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• 제18권4호
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• pp.21-30
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• 2008

본 연구에서는 신장성 수축운동에 의한 미세 근수축 요소 손강 이론(Morgan & Allen, 1999)을 검증하고자 신장성 수축운동의 범위에 따른 골격근의 기계학적 특성 변화에 주안점을 두어 실험 연구를 수행 하였다. 12명의 건강한 피험자가 최대 발목 족배굴곡근의 신장성 수축운동을 수행하였고, 운동수행 전에 최대 등척성 발목 족배굴곡 모멘트-각도 관계로부터 최적 발목 각도의 변화를 측정하였다. 신장성 수축운동 추 최적 발목 각도 변화는 신장성 수축운동의 범위와 상관없이 근육의 길이가 긴 쪽으로 변화를 가져왔다(4도, p<.05). 따라서 본 연구의 결과는 현재 많은 연구에서 거론되고 있는 신장성 수축에 의한 근력 저하 및 지연성 근육통의 촉발 기전인 신장성 수축에 의한 미세 근수축 요소 손강 이론의 부합하지 않으며, 이 현상을 설명할 새로운 이론 개발을 위한 후속연구의 필요성을 제기한다.

• 한국체육학회지인문사회과학편
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• 제56권4호
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• pp.575-584
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• 2017

이 연구에서는 비만중년여성을 대상으로 저강도 저항운동의 속도 차이가 신체조성, 근활성도 및 근력에 미치는 영향을 검토하는데 그 목적이 있다. 연구대상은 비만중년여성 24명을 일반속도의 저항운동집단(normal resistance training speed group; NSG, n=12) 및 느린속도의 저항운동집단(slow speed resistance training group; SSG, n=12)으로 무작위 분류하였다. NSG는 신장성 수축 1초, 등척성 수축 1초 및 단축성 수축 1초의 총 3초간으로 구성하여 35회 3세트를 실시하였으며, SSG는 신장성 수축 3초, 등척성 수축 1초 및 단축성 수축 3초의 총 7초간으로 구성하여 15회 3세트를 실시하였다. 1RM 30%의 저강도 저항운동은 두 집단 모두 동일하게 세트 당 105초, 세트 간 1분 및 운동 간 3분의 휴식시간, 그리고 주 2~3회의 4주간에 걸쳐서 실시하였다. 신체조성, 근활성도 및 근력은 운동전과 운동 4주후에 각각 동일한 방법으로 측정하였다. 신체조성에서 NSG는 WHR에서, SSG는 체지방률에서 운동 전과 비교하여 운동 후에 각각 유의하게 감소하였다(p<.05). 근활성도에서 NSG 및 SSG는 위팔두갈래근, 안쪽넓은근 및 가쪽넓은근에서 운동 전과 비교하여 운동 후에 각각 유의하게 감소하였다(p<.01, p<.05). 근력에서 NSG 및 SSG는 biceps curl 및 leg extension에서 운동 전과 비교하여 운동 후에 각각 유의하게 증가하였다(p<.01). 하지만 신체조성, 근활성도 및 근력은 집단 간의 비교에서 통계학적으로 유의한 차이가 나타나지 않았다. 따라서 이 연구에서 신체조성, 근활성도 및 근력은 저항운동의 속도차이(반복횟수)보다는 저항운동의 수행시간(근수축 발생시간)과 밀접한 관련성이 있을 가능성이 시사되었다.

• 한국전문물리치료학회지
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• 제10권3호
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• pp.141-149
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• 2003

Median frequency can be regarded as a valid indicator of local muscle fatigue. As local muscle fatigue develops, the muscle fiber conduction velocity decreases, the fast twitch fibers are recruited less, and consequently the median frequency shifts toward the lower frequency area. The aim of this study was to test the characteristics of the median frequency according to exercise load (30% and 60% of MVC on the biceps brachii, 40% and 80% of MVC on the vastus lateralis) during the fatiguing isometric exercise. Thirteen healthy male volunteer students of Yonsei University were recruited. After the testing maximal voluntary isometric contraction, three variables (initial median frequency, regression slope, fatigue index) from the regression line of MDF data were measured in each exercise load. The results showed that the regression slope and fatigue index were significantly different for the biceps brachii, but not for the vastus lateralis initial MDF was not significant difference according to the exercise load on both muscles. The regression slope and fatigue index could monitor physiologic muscle change during fatiguing isometric exercise. The results showed that two MDF variables reflect the local muscle fatigue according to the exercise load.

• 대한통합의학회지
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• 제2권3호
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• pp.39-48
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• 2014

Purpose : The purpose of this study was to identify the effect of lumbar stabilization exercise (LSE) and isometric lumbar strengthening exercise (ILSE) on lumbar strength and lumbar extension range in healthy young adults. Method : Ten healthy young adults (six males and four females) volunteered to carry out the LSE and ILSE program for two weeks. The subjects were randomly allocated to two groups: the LSE group (n=5) and the LSE plus ILSE group (n=5). The LSE consisted of 20 minutes of exercise related to lumbar stabilization, and the ILSE was composed of five minutes of isometric stabilization exercise with a specific device. Each group exercised three times per week for two weeks. Assessment tools were made using the subjects' isometric lumbar strength and lumbar extension range before and after the interventions. Results : Statistical analysis revealed significant differences in isometric lumbar strength and the lumbar extension range between before and after the interventions in each group (p<.05). Also, the lumbar extension range improved significantly in the LSE plus ILSE group compared to the LSE group; however, there was no statistically significant difference in the two groups' isometric lumbar strength (p>.05). Conclusion : The findings suggest that ILSE might be feasible in clinical settings by offering benefits for lumbar function. Future studies will be continued.

• 대한물리치료과학회지
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• 제6권4호
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• pp.167-171
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• 1999

Objective: To investigate muscle strength after short term isotonic and isometric exercise. Method: Twenty two healthy men and women were randomly designed isometric and isotonic exercises. Each participant was asked to perform 10 sessions of isometric and isotonic exercises. The assessment measured pre and post 10 sessions exercises by Cybex 340. Result: Isometric exercise significantly increased by $60^{\circ}$/sec and isotonic exercise significantly increased by $120^{\circ}$/sec, $180^{\circ}$/sec. Isometric exercise and isotonic exercise increased by all speeds. Most increased at $120^{\circ}$/sec, $180^{\circ}$/sec by isometric exercise and $60^{\circ}$/see by isotonic exercise but not significantly. Conclusion: Short term isotonic and isometric exercise increase muscle strength. Even if the exercise session is short term, the sessions increase muscle strength.

• 한국운동역학회지
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• 제16권3호
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• pp.75-83
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• 2006

The purpose of this study was to investigate steady-state force depression following active muscle shortening in human tibialis anterior muscle during voluntary contractions. Subjects (n = 7; age $24{\sim}39$ years; 7 males) performed isometric reference contractions and isometric-shortening-isometric contractions, using maximal voluntary effort. Force depression was assessed by comparing the steady-state isometric torque produced following active muscle shortening with the purely isometric reference torque obtained at the corresponding joint angle. In order to test for effects of the shortening conditions on the steady-state force depression, the speed of shortening were changed systematically in a random order but balanced design. Ankle dorsiflexion torque and joint angle were continuously measured using a dynamometer. During voluntary contractions, muscle activation of the tibialis anterior and the medical gastrocnemius was recorded using surface electromyography. Force depression during voluntary contractions, with a constant level of muscle activation, was 12 %, on average over all subjects. Force depression was independent of the speeds of shortening ($13.8{\pm}2.9%$, $10.3{\pm}2.6%$ for 15 and 45 deg/sec over 15 deg of shortening, respectively). The results of this study suggest that steady-state force depression is a basic property of voluntarily-contracting human skeletal muscle and has functional implication to human movements.

• 한국전문물리치료학회지
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• 제15권2호
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• pp.1-10
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• 2008

This study compared the effect of therapeutic exercise with conservative treatment in women with chronic neck pain. Subjects were allocated to control, neck isometric exercise, and cervical stabilization exercise groups consisting of 29, 32, and 31 patients, respectively. The conservative treatment for the control group consisted of hot packs, ultrasound, interferential current therapy, and intermittent cervical traction. The neck isometric exercise group performed a neck isometric exercise and the cervical stabilization exercise group performed a cervical stabilization exercise. To compare the three groups, the levels of perceived pain, neck disability, and psychological depression were assessed on admission, at discharge, and one month after discharge. On admission and at discharge, the pain and neck disability scores did not differ significantly among the groups. However, one month after discharge, both the neck isometric and cervical stabilization exercise groups had significantly improved perceived pain levels as compared to control (p<.05). The improvement in the degree of neck disability was most significant in the cervical stabilization exercise group (p<.05). On comparing the changes in the variables at the three assessments for each group, there was a significant difference between the control and cervical stabilization exercise groups (p<.05). The findings indicate that therapeutic exercises, especially cervical stabilization exercises, are more effective for improving pain and neck disability than conservative treatment.