• Journal of the Korean Applied Science and Technology
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• v.37 no.6
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• pp.1646-1658
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• 2020

In order to investigate the changes in growth hormone, testosterone, blood lactate, double product, and pain, this study conducted intensive weight training and circuit weight training with 60% intensity of 1RM for 7 men who had more than 6 months of resistance exercise and then performed Underwater Walking and Underwater Sitting with underwater recovery. Growth hormone was high in all exercise forms and recovery methods in order of after exercise, after recovery, and after stability, and testosterone was high in order of after exercise, after recovery, and stability. Blood lactate was higher in all exercise forms and recovery methods in order of after exercise, after recovery, and after stabilization, and dynamic recovery after concentration resistance exercise was lower than static recovery. Double product was higher in all types of exercise and recovery methods in order of after-exercise, after-recovery, and stability. Muscle pain decreased in the order of exercise, recovery, 24 hours, 48 hours, and 72 hours in all exercise forms and recovery methods. In the water environment, dynamic recovery is considered to be more effective in improving muscle fatigue than static recovery.

• Water for future
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• v.56 no.5
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• pp.36-42
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• 2023

• Journal of Navigation and Port Research
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• v.36 no.5
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• pp.371-378
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• 2012

This paper presents a timing recovery method using Gardner TED (Timing Error Detector) with a Peak Detector using Parabola Peak Interpolation in underwater acoustic communication. This method will have an eye to improve phase converge speed of timing recovery and reduced amount of Tx data. The OQPSK(Offset Quadrature Phase Shift Keying) modulation technique was considered. The proposed algorithm has faster recovery speed and more accurate than Gardner TED because the sampling values in the proposed algorithm are moved persistingly to maximum or minimum point using parabolic peak interpolation. when simulation performed using Preposed method, it improved BER (Bit Error Rate) performance about 23% And to evaluate the performances of the proposed algorithm the sea trial was performed in the Korean East Sea. And distance of a transmitter-receiver is 3 km each other. As a result, the proposed algorithm outperforms better BER performance about 20% of timing recovery than the Gardner method. Also Proposed method improved converge speed of timing recovery about 1.4 times better than Gardner method.

• The Journal of the Korea Contents Association
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• v.9 no.12
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• pp.674-682
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• 2009

The purpose of this study was to investigate the effect of aquatic gait training on plantar foot pressure, foot kinesiology and gait speed in right hemiplegic patients. The subject were 20 stroke patients who elapsed from 12 month to 24 month after stroke(aquatic gait training group(n=10), land gait training group(n=10)). This study measured plantar foot pressure, toe out angle, subtalar joint angle, gait speed from data of gate on 2m long measuring apparatus for RS-scan system(RS scan Ltd. German). This experiment performed in twice, before and after the aquatic gait training and land gait training. Collected data were statistically analyzed by SPSS Ver. 12.0 using descriptive statistics, paired t-test. Aquatic gait training group had more variety pressure area on their foot such as T1(Toe 1), HM(Heel medial), and HL(Heel lateral). But motion of subtalar joint flexibility and toe out angle decreased considerably and gate speed also increased. According to the result, aquatic gait training is considered as more effective way in foot stability and normal gait pattern than land gait training.

• Development and Reproduction
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• v.15 no.2
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• pp.143-150
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• 2011

The objective of this study was to determine the effect of exercise on a hemiparkinsonian rat model. Nigrostriatal dopamine cell lesions were produced by injecting 6-hydroxydopamine at the left medial forebrain bundle of rats. In this study, the rats were divided into the following 4 groups: the control group without any exercise, experimental group I with aqua-exercise (Exp I), experimental group II with balance exercise (Exp II) and experimental group III with complex exercise (aqua-exercise+balance exercise; (Exp III)). Exercises were applied to all the experimental groups after the operation. In order to observe the dopaminergic cell loss, we assessed the level of tyrosine hydroxylase (TH) expression in the midbrain of rats, and performed the apomorphine-induced rotation test at postoperative days (PDs) 7, 14, and 21. Experimental groups had significantly higher TH-immunoreactivity and behavioral performance than the control group. However, there was no difference in TH-immunoreactivity and behavioral performance across the experimental groups. These results suggest that the application of aqua-exercise and balance exercise could suppress dopaminergic cell loss in the substantia nigra of rat brains and could increase behavioral recovery in hemiparkinsonian rats.

• Proceedings of the Korea Water Resources Association Conference
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• 2022.05a
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• pp.470-470
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• 2022

서울시 한강본류(이하 한강)의 4대 지류하천인 안양천, 중랑천, 탄천, 홍제천은 한강과 도심을 연결하는 도심 자연생태계의 중심공간이자, 서울시민의 대표적인 친수환경 공간으로서 그 관리의 중요성이 커지고 있다. 한강의 수위변화는 서울시 주요 지류하천의 수리, 수질, 생태, 친수 등 물환경 전반에 영향을 미친다. 최근 기후변화와 관리정책의 변화로 인해 한강의 수위변화 요인이 증가하고 있다. 그 중, 하천의 환경 및 생태적인 기능이 부각됨에 따라 한강의 물길회복을 통한 자연성 회복을 위해 한강하류에 설치된 횡단구조물인 신곡수중보의 해체, 또는 개방이 주요하게 논의 되어오고 있다. 이에 따라, 신곡수중보의 해체 및 개방이 한강에 미치는 영향을 다각적인 측면에서 검토하였지만, 지류하천의 물환경 변화에 대한 영향검토는 미흡한 실정이다. 본 연구에서는 신곡수중보 개방 및 해체에 따른 한강 본류와 서울시 주요 지류하천의 수위변화를 예측하고, 주요 지류하천에서 발생가능한 물환경 이슈를 분석하였다. 신곡수중보의 개방 또는 해체는 한강의 수위변화에 대한 조석의 영향을 증가시켜 한강의 수위저하와 수위변동성도 크게 증가되는 것으로 분석되었다. 이는 지류하천 중 하류부에 낙차공과 같은 수위유지 기능이 있는 구조물이 설치되지 않은 안양천과 중랑천의 하류부에서 흐름단면 최대 70%이상 감소, 유속 2배이상 증가 등 큰 수리변화를 유발하는 것으로 분석되었다. 이로 인해 안양천과 중랑천에서는 유속 증가에 따른 하상변화와 대규모 노출지 발생, 생태계 훼손 문제, 수위저하에 따른 수심유지 문제, 수체감소에 따른 오염도 증가와 악취문제, 하천경관 및 하천이용 문제 등의 물환경 이슈가 발생할 것으로 예측되었으며. 특히, 1970년 이전 중랑천 한강 합류지점에 위치했던 저자도의 복구/복원이 향후 주요한 이슈로 부각될 것으로 예상되었다.

• The Journal of the Korea Contents Association
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• v.9 no.12
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• pp.656-664
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• 2009

The purposes of this study were to examine whether aquatic exercise has influence on the neuroplasticity and vestibulo-motor function in diffuse brain injury rats. 80 Sprague-Dawley rats were assigned to four groups; Group I: control group (n=20), Group II: aquatic exercise (n=20), Group III: treadmill exercise with change of velocity and inclination (n=20), Group IV: simple treadmill exercise (n=20). And we applied exercise each groups for 3 weeks except Group I. Before the rats were sacrificed to identify immunohistochemistry study at each time of measurement day, Rota-Rod test was given to assess changes in vestibulomotor function. then, the immunohistochemistry study of GAP-43 in discrete regions of the rat brain was performed to measure changes in neuroplasticity. The results demonstrate that aquatic exercise group is more effective than other groups. expression of GAP-43 and vestibulo-motor function were increased most in aquatic exercise group. Therefore, this study suggest that aquatic exercise may effective therapeutic approach to increase neuroplasticity and vestibulo-motor function in traumatic brain injury.

• Journal of Korean Physical Therapy Science
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• v.10 no.2
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• pp.184-192
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• 2003

This study were investigated the effects to the starting-time of the applied aquatic exercise to the functional healing phase on the Achilles tendon injured rats. The Spraque-Dawley female rats weights($246{\pm}18g$) were assigned to the four groups(24 rats), all experimental groups were able to walling training for 20 min. on the rolling bar motor before injured, one group; control group and three groups; aquatic exercise groups, The aquatic groups were derived into the first day, fourth day and seventh day groups after injuring Achilles tendon according to the levels of aquatic exercise. This studied were investigated the effects of functional healing after appling the aquatic exercising after first day, fourth day and seven days after injured Achilles tendon by the method of rolling bar-motor(Jc-35L-H/GEAR MOTOR, DC, 12V-20RPM, TAIWAN)R.O.C. and to the phase of healing phase to the Achilles tendon. After injuring Achilles tendon, the starting-times of walling on the rolling bar motor were showed from 10th day in the first day aquatic groups, after injuring, from the eight day of fourth day and seventh day aquatic groups, but those, of the all aquatic groups were not significantly showed from the ninth day after injured in the control group. There were showed healing phase without adherence like normal tissue from the fourth day group after injured to the control group. The results stewed that aquatic exercising were effected the healing phase to the injured Achilles tendon to apply exercise, after being the late period of inflammation.

• Proceedings of the KSAR Conference
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• 2004.06a
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• pp.269-269
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• 2004

배아줄기 세포는 신경퇴행성 질환의 치료 수단으로 많은 가능성을 가지고 있는 것으로 알려져 있다. 본 연구에서는 중풍 동물모델에서 수중미로 학습을 이용하여 중풍 치료제로서 인간배아줄기 세포의 인지 및 기억력 장애에 대한 기능 회복의 효능을 검토하였고, 인간배아줄기 세포의 신경세포 보호효과를 규명하기 위하여 면역조직화학 염색법을 이용하여 해마내의 세포사멸을 측정하였으며, 인지 및 기억증진의 작용을 규명하기 위하여 아세틸콜린성 신경세포의 활성도를 측정하였다. (중략)

• Journal of Digital Convergence
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• v.19 no.10
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• pp.349-355
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• 2021

This study applied aquatic and land-based exercises to breast cancer patients for comparative analysis and elucidation of their effects on the rehabilitation of cancer patients. Participants included 40 breast cancer patients who were divided into two groups: 20 participants in the experimental group using aquatic exercise and 20 participants in the control group using land-based exercise. After the addition of aquatic or land-based exercises five times per week for eight weeks, differences in each group's shoulder and pulmonary functions as well as their quality of life were compared and analyzed. The results showed a statistically significant difference (p<.001) for shoulder dysfunction, with the experimental group showing a greater improvement than the comparison group. Statistically significant differences (p<.05 and p<.001, respectively) were also observed for forced vital capacity (FVC) and forced expiratory volume in one second (FEV1), with the experimental group showing greater improvements. Finally, a statistically significant difference (p<.001) was observed for change in the quality of life, with greater improvements in the experimental group than in the control group. The results of further research in this field are expected to indicate the most efficient method for the recovery and management of physical, psychological, and social health impacts of breast cancer on patients. Furthermore, the research aims to provide fundamental resources for breast cancer rehabilitation in South Korea by conducting studies on patients with lung cancer or colorectal cancer and the application of various aquatic exercise methods.