• 한국운동역학회지
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• 제18권1호
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• pp.73-83
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• 2008

이 연구의 목적은 배구 블로킹 시 스텝 방법에 따른 남자 대학 배구선수 7명과 체육 전공 남자 대학생 7명을 대상으로 운동학적 특성을 3차원 영상분석으로 구명하는 데 그 목적이 있다. 이 연구의 결과는 다음과 같다. 1. 모든 스텝 방법에서 숙련 그룹이 미숙련 그룹보다 이지 시 최대 수직속도에서 빠르게 나타났고, 점프높이는 높게 나타났다. 2. 크로스 오버 스텝 블로킹 시 엉덩 관절, 무릎 관절, 발목 관절각도의 E1에서 숙련 그룹이 미숙련 그룹보다 작게 굴곡하는 것으로 나타났다. 3. 모든 스텝 방법에서 엉덩 관절, 무릎 관절, 발목 관절의 최대 각속도는 E2에서 나타났다. 4. 크로스 오버 스텝 블로킹 시 엉덩 관절, 무릎 관절, 발목 관절각속도의 E2에서 숙련 그룹이 미숙련 그룹보다 느린 것으로 나타났다. 결론적으로 상지의 사용이 자유로운 크로스 오버 스텝 블로킹이 점프높이를 통한 방어 능력 개선에는 다소 효율적인 방법인 것으로 판단된다.

• 한국전문물리치료학회지
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• 제9권3호
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• pp.23-37
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• 2002

This study examined the muscle recruitment order during extension of the hip joint in normal subjects, and evaluated whether the external support obtained from wearing a lumbosacral corset had an effect on muscle recruitment leading to increased lumbar stability. The subjects were 40 normal adults (32 male, 8 female) with no history of low back pain and no pathological findings in the nervous or musculoskeletal systems. All subjects extended their hip joints under 3 positions (prone, sidelying, standing). During extension, the onsets of contraction of the rectus abdominis, gluteus maximus, and semitendinosus muscles were measured. Electromyographic activity was measured using a surface electrode, and the muscle contraction onset time was designated as the point exceeding a threshold of 25 ms, using a mean plus twice of the standard deviation. To compare the average order of muscle contraction onset time, a Freedman two-way analysis of variance by ranks was used. The relative difference between muscle contraction onset time wearing and not wearing a lumbosacral corset was measured using a paired t-test. A difference in the average muscle contraction onset order for the rectus abdominis, gluteus maximus, and semitendinosus muscles was observed (p<.05) among three positions. However, wearing a lumbosacral corset did not. change the contraction order. In addition, wearing a lumbosacral corset produced a significant difference (p<.05) in the relative onset time between the rectus abdominis and gluteus maximus in the standing position, but no difference was observed for the other muscles or positions. In the future, patients suffering from low back pain should be compared with normal subjects to determine the effectiveness of a lumbosacral corset in changing muscle recruitment order.

• 한국전문물리치료학회지
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• 제24권2호
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• pp.19-26
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• 2017

Background: To improve lumbo-pelvic stability, passive support devices (i.e., a pelvic belt) are recommended clinically. Nevertheless, to understand the influence of passive support on lumbo-pelvic stability, it is necessary to examine the influence of a pelvic belt on the abdominal and hip abductor muscles. Objects: To examine the effects of a pelvic belt on the forces of the hip adductor and abductor muscles and activity of the abdominal muscles during isometric hip adduction and abduction. Methods: This study recruited 14 healthy men. All subjects performed isometric hip adduction and abduction with and without a pelvic belt in a neutral hip position. Load cells, wrapped with a non-elastic belt, were placed above the medial and lateral malleoli of the dominant leg to measure the muscle forces of the hip adductors and abductors, respectively. The forces of the hip adductors and abductors were measured using a load cell during isometric hip adduction and abduction, while the electromyographic activities of the bilateral rectus abdominis, internal oblique, and external oblique muscles were measured. Results: The forces generated by the hip adductors and abductors were significantly greater with the pelvic belt than without (p<.05). No significant differences in abdominal muscle activities between the two conditions were found (p>.05). Conclusion: These findings suggest that use of a pelvic belt could lead to effective strengthening exercise of hip muscles in individuals with sacroiliac joint pain.

• 대한물리의학회지
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• 제13권4호
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• pp.123-129
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• 2018

PURPOSE: This study was conducted to investigate the influence of hip abduction angle on the muscle activity of the Gluteus Maximus (GM), Biceps Femoris (BF) and Tensor Fascia Lata (TFL) during Knee Flexed Prone Hip Extension exercise. METHODS: The subjects of this study were 42 healthy individuals. All participant consented to participate in this study. Subjects performed exercise, using the Knee Flexed Prone Hip Extension exercise in three hip abduction position $0^{\circ}$, $15^{\circ}$ and $30^{\circ}$. Subjects rested two minutes, between changing hip abduction position. Data were analyzed using a Noraxon MR-XP 1.08 Master Edition EMG to determine average amplitude, for each angle and muscle. All data were processed by Multivariate analysis of variance (MANOVA). There were a total of three groups. the GM muscle, BF muscle, TFL muscle. RESULTS: GM muscle activity was greatest in the $30^{\circ}$ hip abduction position (p<.05), followed by $0^{\circ}$. Between $0^{\circ}$ and $30^{\circ}$ has significant difference in muscle activity. However, the BF and TFL amplitude were greatest at $0^{\circ}$ hip abduction position followed by $30^{\circ}$. Moreover, the TFL differed significantly between $0^{\circ}$ and $30^{\circ}$, but, BF did not (p<.05). CONCLUSION: Hip abduction at $30^{\circ}$ was found to be the most appropriate position for GM muscle activity.

• 대한물리치료과학회지
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• 제30권1호
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• pp.1-9
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• 2023

Background: The advantages of robotic therapy have recently been attempted several times in the rehabilitation of total hip arthroplasty (THA) patients. Therefore, this study also aims to report a case of how robot therapy affects the function of THA patients due to developmental dysplasia of the hip (DDH). Design: Case Study. Method: This study used the A-B-A' design. Period A is before robotic therapy, period B is robotic therapy, and period A' is after robotic therapy. The subjects performed physical therapy and occupational therapy for five days each during the baseline period A and A'. In intervention period B, robotic therapy was performed for five days along with the baseline intervention. This study was conducted for a total of fifteen days. The subjects' sit to stand (STS), timed up and go (TUG), and 10 metre walk (10MW) were evaluated. Result:: STS and TUG were significantly improved in periods B and A' compared to period A (p<0.05), and STS was significantly improved in period A' compared to period B (p<0.05). 10MW showed no significant improvement in periods B and A' compared to period A. Conclusions: This study confirmed that robot therapy was an effective intervention in improving the function of women in their 30s who underwent THA due to DDH. In the future, a study comparing the control group should be performed.

• PNF and Movement
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• 제21권3호
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• pp.281-289
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• 2023

Purpose: This study investigated the effects of the non-elastic taping method for controlling internal hip joint rotation on internal and external hip rotator muscle activity in healthy people. Methods: In this study, 18 healthy volunteers were instructed to perform the small knee bending (SKB) test. All participants completed the test following two methods (using non-elastic taping and not using taping). Muscle activation during the two methods was measured using a surface electromyography (EMG) device. Surface EMG data were collected from the gluteus medius, gluteus maximus, and tensor fasciae femoris muscles while performing the SKB test with and without non-elastic taping. Results: Muscle activity in the gluteus maximus was significantly higher during the SKB test with non-elastic taping than during the conventional SKB test with taping (p < 0.05). Tensor fasciae latae muscle activity was lower during the SKB test with non-elastic taping than during the conventional SKB test (p < 0.05). Conclusion: The findings suggest that the non-elastic taping method for controlling internal hip joint rotation effectively activates the hip's external rotator muscles and minimizes unwanted internal rotator muscle use during the SKB test. Therefore, the non-elastic taping method for controlling internal hip joint rotation could be an effective intervention for those who cannot control the internal rotation of their hips.

• 재활복지공학회논문지
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• 제10권2호
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• pp.147-153
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• 2016

본 논문의 목적은 보행 시 대퇴절단인의 엉덩관절과 무릎관절의 협응을 평가하고, 건측과 의지측의 대칭성에 대하여 평가하는 것이다. 본 연구에는 7명의 대퇴절단인($46.4{\pm}10.7$세, $174.8{\pm}3.5cm$, $78.3{\pm}9.7kg$)와 7명의 비절단인($24.0{\pm}4.5$세, $174.5{\pm}5.9cm$, $66.9{\pm}9.4kg$)가 참여하였다. 이들은 편한 속도로 10m 평지보행을 하였으며, 이때 보행 분석시스템을 이용하여 엉덩관절과 무릎관절의 각도와 각속도를 측정하였으며, 이를 기반으로 입각기와 유각기의 연속상대위상(CRP), CRP의 표준편차(CRP_SD) 및 이들의 대칭지수(SI)를 계산하였다. 그 결과 비절단인의 경우 CRP 및 CRP_SD는 좌우가 차이가 없었지만 (모두 p>0.05), 대퇴절단인의 경우는 입각기의 CRP를 제외하고는 모두 유의한 차이를 보였다 (모두 p<0.05). 또한 비절단인과 대퇴절단인간의 SI는 모두 유의한 차이를 보였다 (all p<0.05). 결론적으로 대퇴절단인의 경우 하지의 협응이 변화되며, 건측과 의지측의 좌우 비대칭이 발생하는 것을 확인하였다.

• 한국전문물리치료학회지
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• 제15권2호
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• pp.54-63
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• 2008

The purpose of this study was to examine the effect of the hip internal rotation on knee extensor and hip abductor electromyographic (EMG) activity during stair up and stair down mobility. Eighteen healthy subjects were recruited. All subjects performed stair up and down movements on a step of 30cm height while maintaining the hip in neutral (condition 1) and hip in internal rotation (condition 2). Surface EMG activity was recorded from five muscles (gluteus maximus, vastus lateralis (VL), vastus medialis oblique (VMO), posterior gluteus medius (Gmed), and tensor fascia latae (TFU)) and hip internal rotation angle was measured using a three dimensional motion analysis system The time period for stair up and down was normalized using the MatLab 6.5 program, and EMG activity was normalized to the value of maximal voluntary isometric contraction (%MVIC). The EMG activities according to the hip rotation (neutral or internal rotation) during the entire time period of stair up and down in each phase were compared using a paired t-test. During the entire period of stair up, the EMG activities of VL and TFL in condition 2 were significantly greater than in condition 1 (p<.05). During the entire period of stair down, the EMG activities of VL and TFL in condition 2 were significantly greater than in condition 1 (p<.05). However, the EMG activities of the other muscles were not significantly different between the conditions (p>.05). These results suggest that the stair up and down maintaining hip internal rotation was could be a contributing factor on patellar lateral tracking.

• 한국운동역학회지
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• 제19권1호
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• pp.107-115
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• 2009

본 연구는 다운증후군을 가진 아동($9{\sim}12$세) 9명을 대상으로 12주간의 근력, 평형성, 보행 동작 훈련이 보행과 관련된 운동학적 특성에 미치는 효과를 규명하는 것이다. 근력, 평형성, 보행의 변화를 관찰하기 위해서 훈련이 시작되어 12주가 경과한 시점에서 사전 검사와 동일한 방법으로 보행의 운동학적 변인을 측정하였다. 보행의 운동학적 특성은 3차원 영상분석법을 통하여 산출하였다. 12주간의 근력, 평형성, 보행훈련 후에 골반의 회전이 감소하였으며, 무릎과 엉덩 관절의 굴곡이 증가하였으며, 다리를 스윙할 때 엉덩관절의 외전이 감소하였다. 또한, 분당 보폭 수가 증가하였으며 보폭은 감소하였다. 결론적으로 다운증후군 아동들은 12주간의 근력, 평형성, 보행훈련 후에 보행의 운동학적 변인이 향상되었다.

• 대한통합의학회지
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• 제6권3호
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• pp.33-42
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• 2018

Purpose : The purpose of this study was to investigate the characteristics of the Flex-OA shoe, a specific functional shoe, in terms of the range of motion (ROM) of hip and knee joint during walking when compared to a standardized shoe. Methods : Twenty-six healthy adults (18 males, 6 females) participated in this study. Subjects performed 8 walking trials consisting of two different shoe conditions to evaluate the hip and knee ROM using a three-dimensional motion capture system. Visual 3D motion analysis software was finally used to coordinate the kinematic data. Result : The total ROM and maximal abduction range of the hip joint in the coronal planes when wearing the Flex-OA shoe were significantly increased during walking compared to wearing a standard shoe (p<.05). On the other hand, significantly increased ROM was observed in the sagittal plane when wearing the Flex-OA shoe in the knee joints compared to a standard shoe (p<.05). Conclusion : Although clinical application of the specific functional shoe has known clearly positive effects on knee moments, the results of this study could provide important clues to explain the background of these effects in terms of the hip and knee joints when applying a specific functional shoe.