• 미래기술융합논문지
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• 1권1호
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• pp.33-42
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• 2022

무릎관절의 굽힘근과 폄근은 신체의 안정성을 유지하는 데 필수적이다. 본 연구는 무릎 굽힘근 및 폄근의 등속성 파라미터와 하지 근육 기능의 상관관계를 조사하고자 하였다. 22명의 건강한 성인이 본 연구에 참여하였습니다. 무릎 굽힘근 및 폄근의 time to peak torque (TTP), acceleration time (AT), peak torque (PT)가 측정되었습니다. 하지 기능 평가를 위해 20m sprint, Sargent jump, one leg hop test, and side shuffle이 측정되었습니다. 각 변수들 간의 상관관계가 Pearson correlation coefficient을 사용하여 분석되었습니다. knee flexor의 PT는 single leg hops and 6M hops in a single leg와 유의한 상관관계를 나타내었다. knee extensors의 PT는 Sargent jumps and triple hops와 유의한 상관관계가 갖는 것으로 발견되었다. 본 연구 결과를 기반으로 무릎 굽힘근 및 폄근의 근력이 하지 기능을 예측하는 데 사용될 수 있는 가능성이 있음을 시사한다.

• PNF and Movement
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• 제17권3호
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• pp.463-469
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• 2019

Purpose: This study investigated the effect of plantar-flexor muscle fatigue on the force sense and joint reposition sense of ankle joints in the healthy adults. Methods: Fifteen healthy subjects (male: 9, female: 6) participated in this study. A digital dynamometer was used to measure the force sense error while a wireless motion capture device was used to measure the joint reposition sense error. To induce plantar-flexor muscle fatigue for a dominant lower extremity, the subjects were asked to perform plantar flexion until exhaustion while barefoot. The differences in force sense error and joint reposition sense error for the ankle joint were measured immediately. The Wilcoxon test was used to compare these values before and after inducing plantar-flexor muscle fatigue. Results: The force sense error and joint reposition sense error of ankle joints after inducing plantar-flexor muscle fatigue increased significantly compared to the values before inducing muscle fatigue. Conclusion: This study suggests that plantar-flexor muscle fatigue could degrade the force sense and joint reposition sense in ankle joints. In addition, it could deteriorate ankle proprioception.

• PNF and Movement
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• 제16권3호
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• pp.355-363
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• 2018

Purpose: The purpose of this study was to obtain detailed and quantified data concerning the effects of plantarflexor muscle fatigue induced in the non-paretic side on the spatial and temporal gait parameters of the bilateral lower extremities during walking in stroke patients. Methods: This study was conducted on 20 patients with chronic stroke. The load contraction fatigue test was applied to induce muscle fatigue in the non-paretic plantarflexor muscle. Step length, stride length, double support, gait velocity and cadence, and functional ambulatory profile (FAP) score in the bilateral lower extremities were measured using a gait analysis system in order to investigate changes in temporal and spatial gait parameters caused by muscle fatigue on the non-paretic side. The statistical significance of the results was evaluated using a paired t-test. Results: A review of the results for gait parameters revealed a significant increase in double support (p<0.05) and a significant decrease in step length, stride length, gait velocity and cadence, and FAP score (p<0.05). Conclusion: These results indicate that the muscle fatigue in the non-paretic side of the stroke patients also affected the paretic side, which led to a decrease in gait functions. This implies a necessity to perform exercise or training programs in a range of clinical aspects not causing muscle fatigue.

• 대한물리의학회지
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• 제14권3호
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• pp.127-133
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• 2019

PURPOSE: The aim of this study was to obtain detailed and quantified data concerning the effects of plantarflexor fatigue induced to the non-paretic side on muscle activities of the bilateral lower extremities during walking in chronic stroke patients. METHODS: In this study, chronic stroke patients were evaluated for six months after the onset of stroke. To induce the non-paretic plantarflexor fatigue, 20 chronic stroke patients were asked to perform their given fatigue affecting assignments, which were presented in a forced contraction fatigue test method, until the range of motion of the plantarflexor was reduced to less than 50%. The muscle activities of the rectus femoris, tibialis anterior and gastrocnemius in the paretic and non-paretic lower extremities were measured using a wireless surface EMG before and after muscle fatigue induction. RESULTS: The findings showed that after plantarflexor fatigue was induced on the non-paretic side, a significant decrease in muscle activities of the rectus femoris on the paretic side was noted (p<.05). The muscle activities of the tibialis anterior and gastrocnemius were also observed to decrease, but, these results were not statistically significant (p>.05). In the non-paretic side, there was a significantly decrease in the muscle activities of the rectus femoris, tibialis anterior, and gastrocnemius (p<.05). CONCLUSION: These finding suggest that the muscle fatigue of the non-paretic plantarflexor affects not only the muscle activity of the ipsilateral lower extremity but also the muscles activity of the contralateral lower extremity. This highlights the necessity of performing exercise or training programs that do not cause muscle fatigue in clinical aspects.

• 한국임상수의학회지
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• 제25권2호
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• pp.90-95
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• 2008

One fresh equine cadaver (two forelimbs) and five non-lamed thoroughbreds (ten sound forelimbs) were examined ultrasonographically through 5.0 MHz linear array transducer with a stand-off pad in palmar pastern region. The normal transverse ultrasonographic images of the superficial digital flexor tendon (SDFT), deep digital flexor tendon (DDFT), straight sesamoidean ligament (SSL), oblique sesamoidean ligament (OSL), and medium scutum could be identified at the region. The mean $\pm$ SD (min.$\sim$max. $mm^2$) of SDFT cross-sectional areas at P1A, P1B, P1C in the region were $110.00{\pm}5.38$ ($100{\sim}128$), $100.00{\pm}5.02$ ($90{\sim}111$), $114.00{\pm}3.33$ ($104{\sim}124$), respectively. The mean $\pm$ SD (min.$\sim$max. $mm^2$) of DDFT cross-sectional areas at each phalanx (P1A, P1B, P1C, P2A, P2B) were $136.00{\pm}4.83$ ($125{\sim}147$), $94.00{\pm}5.43$ ($85{\sim}108$), $99.00{\pm}4.87$ ($90{\sim}111$), $115.00{\pm}3.67$ ($108{\sim}124$), $135.00{\pm}3.65$ ($125{\sim}145$), respectively. The mean ratio of SDFT of P1B to DDFT was 0.74, 1.06, 1.01, 0.87, 0.74 at P1A, P1B, P1C, P2A, P2B, respectively.