• PNF and Movement
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• 제17권3호
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• pp.441-450
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• 2019

Purpose: This study identified the co-activation of quadriceps and hamstring muscles during hamstring strengthening exercises in healthy adults. Methods: Twenty-one participants were required for the present study design to achieve 80% power, 0.8 effect size (η2), and an alpha level of 0.05. Thus, this study recruited 21 healthy adults. All participants performed Nordic exercises, bridge exercises, and one-leg deadlifts randomly. The activity of the rectus femoris, vastus medialis (VM), vastus lateralis (VL), biceps femoris (BF), and semitendinosus (SM) were measured. In addition, the ratios of VM/VL and hamstring/quadriceps (HQ) were measured during the three hamstring strengthening exercises using electromyography. One-way ANOVA was used to compare the co-activation of quadriceps and hamstring muscles in the three exercises. Results: The activity of VM and VL during the performance of one-leg deadlifts was significantly higher than the other two exercises. The BF had significantly higher activity during the Nordic exercises compared to the other two exercises. In addition, the SM activation was significantly greater during Nordic exercises than one-leg deadlifts. Additionally, there was significant difference in HQ ratio among hamstring strengthening exercises. In specific, the one-leg deadlifts yielded a significantly lower HQ ratio. Conclusion: This study revealed that one-leg deadlifts are effective in rehabilitation for anterior cruciate ligament injury. In addition, Nordic exercises can be recommended to facilitate hamstring muscle activation.

• PNF and Movement
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• 제19권1호
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• pp.79-86
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• 2021

Purpose: The purpose of this study was to investigate muscle activity according to knee flexion angle during single-limb-deadlift exercises. Methods: In total, 26 healthy volunteers participated. The single-limb-deadlift consisted of 0˚, 15˚, and 30˚ knee joint bending. The electromyography data were collected from the semitendinosus (SM), the biceps femoris (BF), the rectus femoris (RF), the vastus lateralis (VL), and the vastus medialis (VM). In addition, hamstrings and quadriceps (HQ) ratio was measured during the single-limb-deadlift using electromyography. Results: During the single-limb-deadlift, RF, VL, and VM were significantly higher at 30˚ bending angles compared to muscle activity of 0˚ and 15˚ knee-joint bending. The HQ ratio had significant differences in all three knee joint bending angles. In particular, the single-limb-deadlift carried out to a 30˚ knee-joint bend showed the closest value to 1. Conclusion: The most balanced coactivation ratios were observed during a single-limb-deadlift to a 30˚ knee-joint bend angle. A single-limb-deadlift at a knee-bend angle of less than 30˚ could be used as an exercise to prevent ACL injury. It could also be used for post-injury rehabilitation programs by increasing knee-joint stability.

• PNF and Movement
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• 제18권3호
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• pp.333-341
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• 2020

Purpose: The purpose of this study was to investigate the effect of open and closed kinetic chain exercises with a sling on neck flexor thickness during chin-in movement in office workers with forward head posture. Methods: Thirty-one selected subjects randomly performed chin-in movement in open kinetic chain and closed kinetic chain exercises using a sling. All subjects were measured for their neck flexor thickness using ultrasound measurement equipment during the performance of chin-in movement in open and closed kinetic chain exercised. A paired t-test was used to compare the thickness of the total neck flexor, superficial, and deep neck flexor, respectively, between open and closed kinetic chain exercises with chin-in movement. Results: The thickness of the superficial neck flexor diminished in size more greatly during the chin-in movement with the closed kinetic chain than the open kinetic chain, but this was not a statistically significant difference (p > 0.05). On the other hand, the thickness of the total neck flexor and deep neck flexor had more greatly increased during the chin-in movement with the closed kinetic chain than the open kinetic chain, and this was a statistically significant differences (p < 0.05). Conclusion: This study suggested that chin-in movement with a closed kinetic chain is more effective in activating the deep neck flexor than the open kinetic chain. Thus, we believe that the closed kinetic chain exercise using a sling is an effective intervention to correct the postural alignment of individuals with forward head posture.

• PNF and Movement
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• 제20권2호
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• pp.253-262
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• 2022

Purpose: The aim of this study was to identify the effects of performing the half squat exercise with Kinesio taping (HSEKT) on trunk and lower extremity muscle activity and balance ability in general university students. Methods: The 32 participants were randomly assigned to either the HSEKT group (half squats with Kinesio taping) or the control group (half squats with sham Kinesio taping). Both groups performed half squats with either Kinesio taping (HSEKT group) or sham Kinesio taping (control group) for 30 min/day, 3 times/week for 6 weeks. The Noraxon mini direct transmission system (DTS) electromyography (EMG) system was used to evaluate trunk and lower extremity muscle activity. BioRescue equipment was used to measure the movement area of the center of pressure with eyes open and eyes closed. The muscle activity of the trunk and lower extremities and the balance ability of all participants were measured before and after the intervention. An independent t-test was used to statistically analyze the pre- and post-intervention EMG and balance ability results. Results: The trunk and lower extremity muscle activity was found to have significantly improved in the HSEKT group and the control group after the intervention (p < 0.05). Also, the balance ability of the HSEKT group differed significantly after 6 weeks of training compared to that of the control group (p < 0.05). Conclusion: The findings of this study show that performing half squats with Kinesio taping had a positive effect on trunk and lower extremity muscle activity and balance ability in general university students.

• 디지털융복합연구
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• 제13권10호
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• pp.587-595
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• 2015

본 연구는 경도인지 장애 노인들을 대상으로 신체 지각에 기반한 BF 활동과 PNF 활동을 결합한 인지-운동 프로그램의 효과를 살펴봄으로서 신체 지각 기반 인지-운동 활동이 향후 치매 예방 프로그램으로 적용이 가능할지 현장 활용성을 탐색해 보고자 하였다. 검증을 위해 치매 노인들을 대상으로 2014년 5월 16일부터 2014년 8월 1일까지 12주 동안 20명을 선정하여 인지-운동 학습군(이하 CC군)과 작업 치료 학습군(이하 OT군)을 대조군으로 각각 10명으로 나누어 프로그램을 검증하였다. 연구대상자는 CC군과 OT군으로 나누어 해당 프로그램을 60분씩 12주간 참여하였으며, 인지 기능 검사(MMSE-K), 신체 균형 능력 검사(Time up & go test(이하 TUG), Tandem gait test(이하 TA)), 노인 삶의 질 검사(GQOL-D)를 실험 전(0주), 실험 후(12주)에 측정하여 비교 및 분석하였다. 연구 결과, 인지 기능 검사(MMSE-K)에서는 두 집단 모두 유사한 학습 효과를 보여주었다. 그러나, TA & GQOL-D 검사에서는 CC군이 OT 군보다 향상된 학습 효과를 보여주었다. 이러한 결과는 복합 인지-운동 학습 유형이 작업 치료 학습 유형보다 균형능력 향상과 삶의 질 향상에 기여한다는 것을 보여주는 결과로서, 향후 기억 장애 개선 프로그램으로 복합 인지 운동 활동이 고려될 수 있음을 시사한다.

• 대한정형외과학회지
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• 제55권2호
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• pp.117-126
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• 2020

슬관절의 퇴행성 관절염에서 슬관절 전치환술은 널리 시행되고 있고 그 빈도도 점점 증가되고 있다. 수술 후 일상생활로의 복귀, 근력 및 운동범위의 회복 등 기능 회복을 위한 노력이 이루어져야 하고 이는 환자 요인, 수술 술기 및 재활 등 다양한 관점에서 접근해야 한다. 환자의 연령이나 비만의 정도, 성별, 대퇴사두근의 근력 등이 수술 후 기능 회복에 영향을 줄 수 있고 환자의 기대치나 만족도 같은 정신적인 상태도 영향을 준다. 기능 회복을 위하여 수술 전부터 환자교육 및 통증 조절, 대퇴사두근 근력의 강화 같은 치료를 시행할 수 있다. 수술 후 냉찜질 및 압박, 경피적 전기 신경 자극 치료, 신경근육 전기 자극 치료, 저주파 저강도 자기장 치료, 대퇴사두근의 근력운동, 관절범위 운동과 같은 물리치료도 적용할 수 있다. 최근에는 수중에서 근력과 균형감각을 회복시키는 수 치료도 점점 시행되는 추세이다. 이런 기능 회복을 위한 치료들은 수술 후 단기적으로만 시행될게 아니라 장기적으로 꾸준히 시행되는 것이 중요하며 술자는 환자의 상태나, 순응도, 사회적, 심리적 상황 등을 고려하여 적절히 적용하여야 한다.

• 한국전문물리치료학회지
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• 제4권2호
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• pp.1-9
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• 1997

인간의 수행 요소인 국소 근육의 피로는 만성적인 손상을 초래한다. 이 연구는 근전도의 진폭(amplitude)과 근력(muscle force)에서 피로의 영향을 WL과 NWL로 비교하여 조사하였다. 손목 굽힘근의 근력은 시간이 흐름에 따라 WL과 NWL 모두에서 감소되었다. 그러나, WL과 NWL는 시간 경과에 따른 근전도 진폭에서는 차이를 보였다. WL의 근전도 진폭에서는 운동 후 48분에 가장 높은 변화를 보였다. 이를 통하여 근전도의 진폭파 근력이 근피로에 중요한 인자임을 알 수 있다. 이 연구에서 WL은 높은 근전도 진폭을 적용했을 때와 같이 시간이 경과할수록 오랜 효과를 얻을 수 있었다. 그것은 훈련을 통해 보다 많은 운동단위를 동원할 수 있다는 것을 보여준다. 신경근 피로 정도와 이를 회복하기 위해 필요한 기간은 중요하다. 개인적인 훈련량과 적절한 근력 훈련계획을 위한 작업 - 휴식 반복빈도, 그리고 다른 성격의 집단에서 필요한 재활 지침서를 만드는 데 필요하기 때문이다.

• PNF and Movement
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• 제20권2호
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• pp.157-166
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• 2022

Purpose: The aim of this research was to investigate the effects of self-sit-to-stand training on balance ability and sit-to-stand ability in hemiplegic stroke patients using a multisensory feedback device. Methods: A total of 19 stroke patients participated in this study, and they were divided into two groups: 10 underwent self-sit-to-stand training using a multisensory feedback device, and 9 underwent sit-to-stand training with a physical therapist. In both groups, sit-to-stand training was performed for 30 min, 3 times a week, for 6 weeks. The subjects also underwent physical therapy twice a day for 30 min, 10 times a week, for a total of 60 sessions. Balance ability was evaluated using the AFA-50 and Berg Balance Scale. Sit-to-stand ability was evaluated using the five times sit-to-stand test. Results: Sway length, pressure, and total pressure all significantly increased in both groups, and there was no difference between the two groups. The Berg Balance Scale results showed that balance ability significantly increased in both groups, and there was no difference between the two groups. The five times sit-to-stand test results showed that sit-to-stand ability significantly increased in both groups, and there was no difference between the two groups. It was found that the self-sit-to-stand training using a multisensory feedback device had a positive effect on balance control and sit-to-stand ability. When the two groups were compared, no difference in balance ability or sit-to-stand ability was observed. Conclusion: The findings of this study indicate that self-sit-to-stand training using a multisensory feedback device is as effective as sit-to-stand training with a physical therapist. Hence, self-sit-to-stand training using a multisensory feedback device could be an effective home-based exercise protocol for hemiplegic stroke patients to improve their balance and sit-to-stand abilities.