Background: Trunk flexor-extensor muscles’ co-activation and upright posture are important for spinal stability. Abdominal bracing and maximal expiration are being used as exercises to excel torso co-contraction. However, no study has on comparison of the effect of this exercise on multifidus in the upright sitting posture. Objectives: This study aims to verify the effectiveness of abdominal bracing and expiration maneuvers in lumbo-pelvic upright sitting. Design: Cross-sectional study. Methods: Eighteen healthy women were recruited for this study. The multifidus muscle thickness of all subjects was measured in three sitting conditions (lumbo-pelvic upright sitting, lumbo-pelvic upright sitting with abdominal bracing, and lumbo-pelvic upright sitting with maximum expiration) using ultrasound. One-way repeated measure analysis of variance was used for the evaluation. Results: Compared to lumbo-pelvic upright sitting, lumbo-pelvic upright sitting with abdominal bracing and lumbo-pelvic upright sitting with maximum expiration were associated with significantly increment of muscle thickness. There was no significant difference in muscle thickness between lumbo-pelvic upright sitting with abdominal bracing and lumbo-pelvic upright sitting with maximum expiration. Conclusion: Abdominal bracing and maximum expiration could be beneficial to increasing lumbar multifidus thickness in lumbo-pelvic upright sitting.

Background: Cervical dysfunction is a common pathomechanical marker in individuals with forward head posture (FHP). To overcome the limitations of the isometric chin-tuck (ICT) exercise, dynamic neuromuscular stabilization (DNS), which emphasizes an entire spinal chain exercise, has recently shown promising clinical results. Objects: Purpose of this study was to compare the immediate effects between ICT and DNS techniques. Methods: 43 young subjects (mean age, 24.0±5.0 years) were recruited. Group of subjects with FHP were measured under baseline, ICT, and DNS conditions. Outcome measures included sitting height, longus colli (LC) and sternocleidomastoid (SCM) muscle thickness and LC/SCM thickness ratio. One-way repeated measures ANOVA was used to compare the continuous dependent variables among FHP, ICT, and DNS conditions at p<.016. Results: Both ICT and DNS exercise conditions yielded significantly increased LC muscle thickness, LC/SCM thickness ratio and sitting height than did FHP condition (p<.0001, respectively). Sitting height was significantly greater in DNS exercise than in the ICT exercise (p<.0001). Conclusion: The present results demonstrated that sitting height was greater in the DNS exercise than in the ICT exercise, as well as both corrective postural training exercises were effective on LC/SCM muscle balance ratio when compared with the baseline FHP condition. Therefore, it is considered that DNS exercise can be the recommended exercise for people with FHP.

The purpose of this study was to compare the slouched and upright sitting positions on lumbar joint reposition error (LJRE). Twenty subjects without low back pain were recruited for this study and, using a random number table, were randomly assigned to two groups; the upright sitting position group (UP group) and the slouched sitting position group (SP group). UP group was first asked to sit in an upright position and the SP group to sit in a slouched position as an intervention, and then the LJRE of both groups was measured at the neutral sitting position (lumbar flexion ). The measurement of the LJRE was repeated after one day. The sitting positions were performed for five minutes each and the LJRE was measured using an electronic goniometer. An independent t-test was used to compare the LJRE of both groups after each sitting position and after one day. The results of this study showed that the LJRE after an intervention in the UP group was lower than in the SP group (p<.05) and the LJRE after one day in the UP group was lower than in the SP group (p<.05). The findings of this study indicate that the upright sitting position can be applied to decrease LJRE, compared with the slouched sitting position. These findings also support that the upright sitting position reduces the potential for proprioceptive loss.

Rapid economic growth and social change have made us not only enjoy rich life in a material way, but also suffer severe mental anguish caused by the confusion about 'true value.' It is impossible to expect us to develop a better society without curing tha

This paper established the analytical model of sea surface oscilation of simple type fishing port with vertical wave absorbor. This model is composed by MAEM(Matched Asymptotic Expansion Method) for wave amplification in fishing port and EEM(Eigen - function Expansion Method) for wave absorbing characteristics against vertical perforated plates. Dimensionless porosity by adopting Darcy's law was introduced to evaluate wave absorbing characteristics of the perforated structure. Using the model, the efficiency of the vertical perforated plates was studied for fishing port tranqulity with number of plates, array method and plate intervals. Optimal design and arrangement of perforated plates can be applied to develop multipurpose fishing ports and villages.

While working in an industrial environment which requires extended periods of upright posture; workers tend to develop muscle fatigue due to the constant load on lower-limb muscles. In addition, when working while bending knees; muscle fatigue of lower back and hamstrings is increased due to the abnormal posture. This can lead to damage of muscles, induce musculoskeletal disorders, and reduce long-term working efficiency. Recent medical studies have shown that long-term working in an upright posture can induce musculoskeletal disorders such as foot fatigue, edema, pain and varicose veins. Likewise, medical and rehabilitation expenses have grown due to the increase in musculoskeletal conditions suffered by workers. For this problem, we aim to develop a device that can reduce the physical fatigue on the lower limbs by supporting the weight of workers during the extended periods of upright and bending postures in the industrial environments. In this paper, we have designed and manufactured a wearable weight support system; with a user intention algorithm that the users can maintain various postures. For validation of the developed system, we measured the muscle activity of the users wearing the system with EMG sensors.

버들송이의 기존품종의 단점을 보완하고 품종 다양화를 위해 단포자 교잡에 의해 육성된 ‘상강’의 주요 특성은 다음과 같다. 균사 생장적온은 26~28℃, 버섯 발생 및 생육온도는 18~20℃이며, 미송톱밥+밀기울+쌀겨+건비지(70:10:10:10, v/v) 배지에서 병재배 시, 배양온도 22~23℃에서 배양일수는 38일, 발이 및 생육온도 18~20℃에서 발이일수는 7일, 자실체생육일수는 5일로, 재배일수는 50일이 되어 ‘미황’과 같았다. 자실체는 개체

본 연구는 경사표면의 특성과 경사각도에 따라 아동과 성인의 자세유지 및 보행 관련 어포던스 지각에 차이가 있는지를 알아보고, 수행 가능성에 대한 지각과 실제 수행 결과간의 관계가 연령에 따라서 어떻게 다른지를 살펴보고자 하였다. 이를 위하여 취학 전 아동(M=5.7세), 취학 후 아동(M=9.8세), 성인(M=24.2세) 집단별로 각각 12명씩의 연구 대상자가 참여하였다. 실험 과제는 거친 표면과 미끄러운 표면으로 이루어지고 일곱 가지의 경사각도(12°, 17°, 22°, 27°, 33°, 39°, 45°)를 갖는 경사면에서 직립자세를 유지하고 걸어 올라갈 수 있는 가능성을 판단하는 과제와 실제로 경사면 위에서 직립자세와 이동 과제를 수행하는 것이었다. 연구 결과, 취학 전 아동은 경사각도가 심한 경사면에서 취학 후 아동과 성인에 비하여 자신의 능력을 과대평가하는 성향이 두드러지게 나타났다. 이러한 성향은 직립자세유지와 이동 과제에서 모두 동일하게 나타났다. 흥미로운 것은 이러한 지각 판단과 실제 수행간의 차이가 27°와 33°의 경사에서 경사표면의 특성에 따라 다르게 나타나, 미끄러운 표면에서는 과대평가 성향이, 거친 표면에서는 과소평가 성향이 크게 나타났다는 점이다. 언어적 반응 시간 결과에서는 모든 대상자들이 33°의 경사에서 지각 판단에 소요된 시간이 가장 많이 걸린 것으로 나타났으며, 취학 전 아동이 취학 후 아동과 성인에 비하여 직립자세를 유지하는 자신의 능력에 대한 지각 판단에 어려움이 큰 것으로 나타났다. 결론적으로, 연령과 환경적 특성에 따라 직립자세유지와 이동과 관련된 어포던스 지각이 다르게 나타난다는 사실은 지각-동작 연합 발달 측면에서 중요하며, 이는 어린 아동의 안전사고를 예방할 수 있는 환경을 조성하는 데 중요한 정보를 제공해 줄 수 있을 것이다.