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- 저자 : Sadayuki (검색결과 17 건)
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Method of Measure and Evaluation for the Mechanical Characteristics of Running Shoes
Sadayuki Ujihashi CHOSUN UNIVERSITY 1997 Basic Science and Engineering Vol.1 No.1
Running shoe sole has an important role to absorb the external impact forces that transmitted from the runningsurface. Especially, the impact force occurred on the runner's heel is about 3 times of the runner's weight. Therefore the purpose of in this paper is to show the method of measurement and evaluation for the mechanical characteristics of shoe sole. The impact device used in the trials, is made by considering the collision conditions between human heel and the running surface. It means the maximum impact force is about 2kN, the impact velocity is 1m/s and the duration time of load is about 20 to 40 ms. Tosatisfy all the conditions,we proposed a drop-weight type testing system with an accurate measuring devices, A variety of commercial running shoes were chosen randomly for the trials, to check up the validity of the testing system. From the measurement, the mechanical porperties of each shoe, including the maximum impact force, maximum deformation, rate of energy absorption, average Young's modulus, etc, are extracted to evaluate the individual cushioning characteristics. At the same, the human sensory evaluation of each shoe was done to compare with the mechanical measurement. As the result, by observing the similar tendencies of these two evaluation that we have obtained. It is obviously that the mechanical measurements have definite correlations with human senses.
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Ito Sadayuki,Sakai Yoshihito,Ando Kei,Nakashima Hiroaki,Machino Masaaki,Segi Naoki,Tomita Hiroyuki,Koshimizu Hiroyuki,Hida Tetsuro,Ito Kenyu,Harada Atsushi,Imagama Shiro 대한척추외과학회 2023 Asian Spine Journal Vol.17 No.2
Study Design: Retrospective study.Purpose: Cervical laminoplasty is safe and effective for treating cervical myelopathy but has a higher frequency of postoperative axial pain compared to other methods. Several studies have reported on the causes of postoperative axial pain, but none have fully elucidated them. This study aimed to investigate the association between postoperative neck pain and intraoperative transcranial motor-evoked potential (MEP) waveforms of the trapezius muscles using transcranial MEPs.Overview of Literature: Few studies have investigated the association between postoperative neck pain and intraoperative transcranial MEP waveforms of the trapezius muscles in patients with cervical laminoplasty.Methods: A total of 79 patients with cervical myelopathy who underwent cervical laminoplasty at our facility between June 2010 and March 2013 were included in this study. Intraoperative control and final waveform were evaluated based on the trapezius muscle MEPs by measuring the latency and amplitude. A neck pain group comprised patients with higher neck pain Visual Analog Scale scores from preoperative value to 1 year postoperatively. The cross-sectional areas of the trapezius muscles and the MEP latencies and amplitudes were compared between patients with and without neck pain.Results: The latency and amplitude of the control waveforms were not significantly different between groups. The neck pain group had a significantly shorter final waveform latency (neck pain: 23.6±2.5, no neck pain: 25.8±4.5; p =0.019) and significantly larger amplitude (neck pain: 2,125±1,077, no neck pain: 1,630±966; p =0.041) than the no neck pain group.Conclusions: Postoperative neck pain was associated with the final waveform latency and amplitude of the trapezius muscle MEPs during cervical laminoplasty. Intraoperative electrophysiological trapezius muscle abnormalities could cause postoperative neck pain.
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Ito Sadayuki,Sakai Yoshihito,Harada Atsushi,Ando Kei,Kobayashi Kazuyoshi,Nakashima Hiroaki,Machino Masaaki,Kambara Shunsuke,Inoue Taro,Hida Tetsuro,Ito Kenyu,Ishiguro Naoki,Imagama Shiro 대한척추외과학회 2021 Asian Spine Journal Vol.15 No.5
Study Design: Retrospective study. Purpose: We aimed to use motor evoked potentials (MEPs) to examine the association of electrophysiological assessment of the trapezius muscle with neck pain. Overview of Literature: Previous reports on the association of neck pain with the trapezius muscle have focused on surface electromyograms and muscle oxygenation; however, to our knowledge, none of these studies included detailed data on MEPs. Methods: The study included 100 patients with cervical myelopathy who underwent surgery at the National Center for Geriatrics and Gerontology in Obu, Japan from June 2010 to March 2013. Before the surgery, neck pain was evaluated using a Visual Analog Scale (a score ≥50 indicated neck pain and a score <50 indicated no neck pain). The preoperative cross-sectional areas of the trapezius muscles were measured with cervical magnetic resonance imaging sagittal T2-weighted images. Cranial stimulation under general anesthesia was used to derive the MEPs, enabling the measurement of latency and amplitude, using preoperative MEPs of the trapezius muscles. Results: The MEP of the trapezius muscle in patients with neck pain had significantly shorter latencies than those in patients who did not have neck pain. However, there was no significant difference in the amplitude between patients with and without neck pain. However, this tended to be greater in patients with neck pain as compared to that in those without neck pain. The cross-sectional area of the trapezius muscle in patients with neck pain was significantly smaller than that in those who did not have neck pain. Conclusions: MEPs revealed electrophysiological abnormalities of the trapezius muscles in patients with neck pain, supporting a relationship of neck pain with the trapezius muscles.
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Effect of alendronate on muscle mass: Investigation in patients with osteoporosis
Atsushi Harada,Sadayuki Ito,Yasumoto Matsui,Yoshihito Sakai,Marie Takemura,Haruhiko Tokuda,Tetsuro Hida,Hiroshi Shimokata 대한골다공증학회 2015 Osteoporosis and Sarcopenia Vol.1 No.1
Objectives: Many osteoporosis drugs reliably increase bone mass in the elderly; if these drugs also had a positive effect on muscle, their benefit would be even greater. We examined the effect of alendronate monotherapy on muscle mass in patients with osteoporosis. Methods: In this retrospective cohort, case-control study, patients from an osteoporosis database were divided into 2 groups: alendronate-treated patients (group A; n ¼ 199) and a control group receiving no drug treatment (group C; n ¼ 233). Appendicular skeletal muscle mass (ASM) and skeletal muscle mass index (SMI) measured by dual-energy X-ray absorptiometry were assessed at approximately 1 year. The change in muscle mass was compared between the groups. Results: At baseline, group A included more women and had lower height, weight, bone mineral content, and muscle mass than group C. A comparison of changes after 1 yeardadjusted for age, sex, observation period, body mass index and initial valuesdrevealed that the muscle mass in group A showed increases by 0.137 kg/m2 in SMI, 514 g in ASM, and 319 g in lower limb muscle mass (LLM). Group C showed no changes in muscle mass. A significant difference in the amount of change in ASM and LLM was found between the groups after adjustment: 2.5 times and 4.4 times higher, respectively, in groups A and C. However, the difference in SMI disappeared after adjustment. Conclusions: This is the first study to show that alendronate may have a positive effect not only on bone, but on muscle as well.
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Sarcopenia in elderly patients with chronic low back pain
Yoshihito Sakai,Hiroki Matsui,Sadayuki Ito,Tetsuro Hida,Kenyu Ito,Hiroyuki Koshimizu,Atsushi Harada 대한골다공증학회 2017 Osteoporosis and Sarcopenia Vol.3 No.4
Objectives: The prevalence of chronic low back pain (CLBP) increases with age and several mechanisms are involved in the development of CLBP, including osteoporosis; however, no associations with sarcopenia have yet been identified. Methods: In total, 100 patients with CLBP and 560 patients without CLBP (nCLBP) aged over 65 years were studied. Skeletal muscle mass index (SMI) and percentage of body fat were evaluated using wholebody dual-energy X-ray absorptiometry. Sarcopenia was diagnosed when the relative SMI was more than 2 standard deviations below the mean in young adults. Thus, the cutoff value for sarcopenia was defined according to Sanada's Japanese population data. Paraspinal muscle cross-sectional areas of the lumbar multifidus and the erector spinae muscles were calculated using magnetic resonance imaging. Results: Forty patients (40.0%) from the CLBP group and 149 (26.6%) from the nCLBP group met the criteria of sarcopenia. SMI was significantly lower and the body fat ratio was significantly higher in the CLBP group compared with the nCLBP group. Sarcopenic obesity was significantly observed in the CLBP group. Lumbar multifidus and the erector spinae muscle cross sectional area were significantly lower in the CLBP group. Conclusions: Elderly patients with CLBP have significantly lower skeletal muscle mass, and age-related mechanisms in sarcopenia are considered to be associated with chronic pain. Therapeutic procedures that are used to treat elderly aging muscle, including muscle strengthening and performance training, can possibly be a treatment for or used to prevent elderly CLBP. © 2017 The Korean Society of Osteoporosis. Publishing services by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/).
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Yoshihito Sakai,Kenyu Ito,Tetsuro Hida,Sadayuki Ito,Atsushi Harada 대한척추외과학회 2015 Asian Spine Journal Vol.9 No.2
Study Design: Preliminary study. Purpose: To assess the association of neuropathic pain with chronic low back pain (LBP) and the effect of pregabalin on neuropathic pain in the elderly. Overview of Literature: Of those with chronic LBP, 37% were predominantly presenting with neuropathic pain in young adults. Pregabalin is effective for pain in patients with diabetic neuropathy and peripheral neuralgia. No study has reported on the effects of pregabalin for chronic LBP in elderly patients yet. Methods: Pregabalin was administered to 32 patients (age, ≥65 years) with chronic LBP for 4 weeks. Pain and activities of daily living were assessed using the Neuropathic Pain Screening Questionnaire (NePSQ), the pain DETECT questionnaire, visual analog scale, the Japanese Orthopedic Association score, the short form of the McGill Pain Questionnaire and the Roland Morris Disability Questionnaire. Modic change and spinal canal stenosis were investigated using magnetic resonance imaging. Results: Altogether, 43.3% of patients had neuropathic pain according to the NePSQ and 15.6% patients had pain according to the pain DETECT. The efficacy rate of pregabalin was 73.3%. A significant effect was observed in patients with neuropathic pain after 4 weeks of administration. Conclusions: Neuropathic pain was slightly less frequently associated with chronic LBP in the elderly. Pregabalin was effective in reducing pain in patients with chronic LBP accompanied with neuropathic pain. Lumbar spinal stenosis and lower limb symptoms were observed in patients with neuropathic pain. We recommend the use of pregabalin for patients after evaluating a screening score, clinical symptoms and magnetic resonance imaging studies.
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A Self-Deleting Neural Network for Vector Quantization
Maeda, Michiharu,Miyajima, Hiromi,Murashima, Sadayuki 대한전자공학회 1996 APCCAS:Asia Pacific Conference on Circuits And Sys Vol.1 No.1
Vector quantization is required the algorithm that minimizes the distortion error, and used for both storage and transmission of speech and image data. For a neural vector quantization [1], the self-creating neural network [2] and self-deleting neural network [3] and known for showing fine characters. In this paper, we improve the self-deleting neural network, and propose a generalization algorithm combining the creating and deleting neural networks. We discuss algorithms with neighborhood relations [2]∼[5] compared with the proposed one. Experimental results show the effectiveness of the proposed algorithm.
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