研究者詳細 - 和田　親宗

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保健衛生業における労働災害事例のテキストマイニング解析:̶動作の反動・無理な動作による事例を対象として̶ 査読有り

北川広大, 永﨑孝之, 中野聡太, 肥田光正, 岡松将吾, 和田親宗

労働安全衛生研究 ( 独立行政法人労働安全衛生総合研究所 ) 13 ( 2 ) 139 - 143 2020年01月

担当区分：責任著者記述言語：日本語掲載種別：研究論文（学術雑誌）

厚生労働省が定めた「第 13 次労働災害防止計画」では，労働災害の件数が減少していない業種等への対策を推進しており，その対象の1つである社会福祉施設では「動作の反動・無理な動作」による労働災害が多い．そこで本研究では，これらの労働災害におけるリスク要因の抽出を目的として，厚生労働省が公開している「労働災害データベース」に収録された計1041例の労働災害事例を調査した．本研究では労働災害事例の発生状況に関する文章記述を対象とし，これらのテキスト情報をテキストマイニング解析によって調査した．テキストマイニング解析では，各頻出語の頻出回数と頻出語同士の共起関係を示す共起ネットワークによって多くの労働災害事例に共通する具体的な状況を考察した．解析結果は「腰」，「ベッド」，「介助」，「痛み」，「移乗」，「患者」，「車椅子」などの語句が多くの事例で頻出，共起していることを示した．この結果から，対象の労働災害事例の多くにベッドや車椅子間の移乗介助による腰痛が発生している可能性が示された．移乗介助による腰痛は平成20年に実施された先行調査においても指摘されているが，本研究の結果を踏まえるとこれらのリスク要因は未だに解決されていないと考えられる．そのため，今後の労働災害対策では移乗介助による腰痛の予防に向けて従来よりも実効性のある解決策を早急に検討する必要があると考える．

DOI： 10.2486/josh.JOSH-2020-0007-TA

その他リンク： https://ci.nii.ac.jp/naid/130007887364

Usefulness of a simulated experience method for transfer assistance for hemiplegia or limited range of motion in multiple joints 査読有り

Nakano Sota, Okada Hirotaka, Higo Shigeyoshi, Nakamura Kouichi, Kitagawa Kodai, Wada Chikamune

Journal of Physical Therapy Science ( 理学療法科学学会 ) 32 ( 8 ) 541 - 544 2020年01月

記述言語：英語掲載種別：研究論文（学術雑誌）

[Purpose] To further the understanding of dysfunctions to which a simulated experience method could be applied, we clarified whether a simulated experience method can promote caregivers to utilize the abilities of care recipients with pseudo-hemiplegia or pseudo-limited range of motion (ROM) in multiple joints. [Participants and Methods] We studied transfer assistance in 60 nursing assistants from nursing home settings: 30 were assigned to the pseudo-hemiplegia (26 females, 4 males) and limited ROM in multiple joints (27 females, 3 males) groups. One healthy person was fitted with orthotic braces to mimic hemiplegia or limited ROM in multiple joints, each making it difficult to stand-up. Participants were randomized to either a simulated experience group (involving interventional help from a physical therapist between the first and second measurements) or a control group. The load difference on the lower limbs of the care recipient between two rounds of transfer assistance was examined. [Results] The difference between the second and first measurements was −5.9 ± 74.5 N for the control group and 107.9 ± 123.6 N for the simulated experience method in the pseudo-hemiplegia study, and −14.7 ± 64.7 N and 149.1 ± 132.4 N, respectively, for the pseudo-limited ROM-in-multiple-joints study. [Conclusion] The simulated experience method promoted transfer assistance of a care recipient with pseudo-hemiplegia or pseudo-limited ROM in multiple joints. These results suggest that hemiplegia and limited ROM in multiple joints are added as dysfunctions that can be applied to a simulated experience method in transfer assistance.

DOI： 10.1589/jpts.32.541

PubMed

その他リンク： https://ci.nii.ac.jp/naid/130007886026

Optimal foot-position of caregiver based on muscle activity of lower back and lower limb while providing sit-to-stand support 査読有り

Kitagawa Kodai, Nagasaki Takayuki, Nakano Sota, Hida Mitsumasa, Okamatsu Shogo, Wada Chikamune

Journal of Physical Therapy Science ( 理学療法科学学会 ) 32 ( 8 ) 534 - 540 2020年01月

担当区分：責任著者記述言語：英語掲載種別：研究論文（学術雑誌）

[Purpose] In caregivers, low load posture is necessary to prevent lower back pain during patient handling activities such as sit-to-stand support. This study focused on the foot-position of caregivers as an adjustable and useful parameter. A wide stance decreases the stress on the lumbar vertebra. However, this foot-position increases loading of the spinae erector muscles. The aim of this study was to investigate the relationship of anterior-posterior and lateral-medial distances between feet and activity of the spinae erector muscles to determine the optimal foot-position for reducing stress on the lumbar vertebra without increasing spinae erector muscle load. [Participants and Methods] Five young male participants were asked to provide sit-to-stand support 10 times using nine normalized foot-positions with different anterior-posterior and lateral-medial distances. Surface electromyograms of the erector spinae and lower limb muscles were measured during sit-to-stand support. [Results] The results showed that the optimal foot-position (anterior-posterior 55%, lateral-medial 20% of body height) increased muscle activity within the lower limb muscles compared with the lower back muscles and did not increase loads on the erector spinae muscle. [Conclusion] Optimizing foot-position can reduce stress on the lumbar vertebra without increasing load on the spinae erector muscles.

DOI： 10.1589/jpts.32.534

PubMed

その他リンク： https://ci.nii.ac.jp/naid/130007886024

自己血管内シャント機能評価を目的とした体導音センサの有用性の検証査読有り

城屋敷健志, 和田親宗

医療機器学 ( 一般社団法人日本医療機器学会 ) 90 ( 5 ) 414 - 422 2020年01月

担当区分：責任著者記述言語：日本語掲載種別：研究論文（学術雑誌）

We verified that arteriovenous fistula (AVF) function can be evaluated from shunt sound using a body-conducted sound sensor (BCS) with a wide-band frequency characteristic. In the BCS, we compared two types of sensors: an air-coupled microphone (ACM) and an acceleration sensor (Type 8001). Evaluation for sensors were performed for 36 patients. We also developed a shunt-sound observation system and evaluated it using the spectrogram and power spectrum values obtained using a sound spectrometer. Furthermore, we verified that two indices of ultrasonography information, namely, the resistance index (RI) and flow volume (FV), can be estimated from the shunt sound and classified through machine learning. The BCS detected the shunt sound signal in the spectrogram over a wide frequency band. The sensitivities of the BCS in the non-amplified detection of stenosis sound signals were 0.93/0.92 (below 1 kHz/above 1 kHz, respectively), surpassing those of other sensors(ACM: 0.82/0.77, Type 8001: 0.82/0.25). Furthermore, the highest machine learning accuracy was obtained using BCS in the classification segments of RI > 0.60, 0.65, and 0.70 and FV < 350 ml/min. BCS is particularly suitable for detecting stenosis sounds of over 1 kHz and estimating RI and is considered to be suitable for functional evaluations of AVF.

DOI： 10.4286/jjmi.90.414

その他リンク： https://ci.nii.ac.jp/naid/130007958314

Spinal postural alignment measurements using markerless digital photography 査読有り国際誌

Hida M., Wada C., Imai R., Kitagawa K., Okamatsu S., Ohnishi T., Kawashima S.

Journal of Orthopaedic Surgery 28 ( 3 ) 2020年01月

記述言語：英語掲載種別：研究論文（学術雑誌）

Background: A device that can measure posture alignment repeatedly is important for the prevention of hyperkyphosis. Objective: We devised a markerless measurement method for hyperkyphosis using digital photography and investigated the correlation with other noninvasive measurements and the validity and accuracy of this method. Methods: The study included 27 participants. The craniovertebral angle in supine (CVAS) and craniohorizontal angle in supine (CHAS) were calculated from digital photographs of the head and neck areas of the studied subjects with ImageJ. The correlations of CVAS and CHAS with the kyphosis index (KI) and block method (BM) were investigated. Intrarater correlation coefficient and Bland–Altman analyses were used to verify the reliability and accuracy of the measured results. Results: CHAS exhibited an excellent correlation with the KI and the BM. The intra- and interrater reliabilities of CHAS were almost perfect. Bland–Altman analysis revealed that CHAS was associated with minor addition errors. Conclusion: CHAS founded an excellent correlation and reliability with the conventional spinal postural alignment measurements. The addition error suggested that the manual was needed to confirm the landmark. The CHAS is a method used to measure the spinal postural alignment in a supine position without markers and without exposing the skin surface.

DOI： 10.1177/2309499020960834

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Regression equation between required force and lumbar load of caregiver in supporting standing-up motion via computational musculoskeletal simulation 査読有り国際誌

Kitagawa K., Nishisako Y., Nagasaki T., Nakano S., Hida M., Okamatsu S., Wada C.

Pertanika Journal of Science and Technology 28 ( Special issue 2 ) 59 - 70 2020年01月

担当区分：責任著者記述言語：英語掲載種別：研究論文（学術雑誌）

Caregivers experience low back pain because of patient handling such as supporting standing-up. The lumbar load of a caregiver depends on the required force for patient handling motions. If the relationship between the required force and the lumbar load is quantitatively clarified, it may be useful for preventing low back pain in caregivers. In this study, we investigated the quantitative relationships between the required force and lumbar loads such as vertebral stress and muscle activity in supporting standing-up by computational musculoskeletal simulation. First, a musculoskeletal model of a caregiver was prepared, and then the model performed simulated supporting standing-up motions. The vertical load used as the required force was placed on the upper limb of the model. The compressive/shear stress of the vertebral (L4–L5) and muscle activities of spinae erector muscle group were recorded as the lumbar load. The results showed that there are highly significant correlations between the required force (r > 0.9, p < 0.01). In addition, regression equations for predicting each lumbar load by the required force with highly determination coefficients (R > 0.9) were obtained from these relationships. Furthermore, we found that when the required force was more than 120 N, the compression stresses of the vertebral exceeded injury threshold (3400 N) by the regression equation. These regression equations contribute to quantitatively consider lumbar loads of caregiver during patient handling based on injury thresholds and the required force. 2

DOI： 10.47836/pjst.28.S2.05

その他リンク： https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=85102634104&origin=inward

Linear regression technique for improvement of feet position estimation during standing balance using a cane with millimeter wave radar 査読有り国際誌

Fernandez I.G., Kitagawa K., Rahman K.A., Soh A.C., Gopalai A.A., Ahmad S.A., Wada C.

Pertanika Journal of Science and Technology 28 ( Special Issue 2 ) 71 - 81 2020年01月

担当区分：責任著者記述言語：英語掲載種別：研究論文（学術雑誌）

It is estimated that one in three seniors fall at least once a year. Falls are a global problem for the elderly that affects their quality of life and poses a great risk. In our research, we are trying to develop a system that could prevent falls by estimating the fall risk in real time. The system would measure the balance of the user by measuring the position of the Center of Gravity inside the Base of Support. In our previous research, we presented a system with a millimeter wave radar attached to a cane to measure the area of the Base of Support. However, the obtained results for the foot position estimation error were significantly worse than similar studies. One of the reasons was that the sensor was not really estimating the position of the feet but the position of the lower legs. Therefore, in this research we present a correction model to improve the feet position estimation. The proposed model was able to reduce the foot position estimation RMSE from 54 mm down to 34 mm, which is closer to the results of other similar studies measuring the position of the feet.

DOI： 10.47836/pjst.28.S2.06

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地域在住高齢者における慢性痛の保有期間と心身機能の関係査読有り

肥田光正，今岡真和，中村美砂，中尾秀俊，田崎史江，生水智子，武田雅俊，山坂宏太，大西忠輔，和田親宗

慢性疼痛 38 ( 1 ) 229 - 233 2019年12月

立ち座り動作支援機器の開発と筋電位評価

三上隼人、土谷圭央、田中孝之、泉博之、和田親宗

第20回計測自動制御学会システムインテグレーション部門講演会 2B1-11 2019年12月

ホーム転落防止のためのホーム端検出に関する研究

徳田あかり，和田康宏，和田親宗

第45回感覚代行シンポジウム講演論文集 45 - 48 2019年12月

Effects of Counter-Movement Technique during Sport Climbing for Lower Limb Amputees through the Electromyogram Analysis 査読有り国際誌

Ryoya Nakamura, Gen Okuya, Yoshiki. Nishisako, Kisuke Iwasaki, Kodai Kitagawa, Naoki Chijiwa, Hisashi Arizono, Chikamune Wada

International symposium on ubiquitous healthcare 2019 (uHealthcare 2019) P-05 2019年12月

Prototype of measurement system for clothing pressures in spinal orthosis 査読有り国際誌

Koji Sakamoto, Kodai Kitagawa, Yuji Katae, Naoki Chijiwa, Aki Kuwazono, Hisashi Arizono, Chikamune Wada

The 17th International Conference on Biomedical Engineering (ICBME2019) No.1279 2019年12月

Estimation Method for Step Length of Caregiver by Machine Learning Technique Using Combination of Insole Pressure Sensor and Inertial Measurement Unit 査読有り国際誌

Kodai Kitagawa, Takayuki Nagasaki, Sota Nakano, Mitsumasa, Hida, Shogo Okamatsu, Chikamune Wada

The 17th International Conference on Biomedical Engineering (ICBME2019) No.1140 2019年12月

Comparison of Regression Algorithm for Vanishing Point Estimation based on Car Distribution 査読有り国際誌

Tangsuksant W., Noda M., Kitagawa K., Pintavirooj C., Wada C.

BMEiCON 2019 - 12th Biomedical Engineering International Conference 2019年11月

担当区分：責任著者記述言語：英語掲載種別：研究論文（国際会議プロシーディングス）

© 2019 IEEE. In order to improve an application from the viewpoint of helping blind people waiting for the bus, classification of the vanishing view is required. The vanishing point from a perspective view is a feature that may improve the performance of viewpoint classification, especially in the case of congested traffic. The idea proposed by this study bases on the vanishing point estimation following car distribution on the road. In essence, the cars are detected using a You Only Look Once (YOLO) technique which extracts all the to the center point of a squared boundary. Normalization of the data points are then computed in percentages. Next is the calculation of the nineteen features of the data points of the car distribution. Finally, the vanishing point is estimated by supervised regression. This experiment compares the estimated results among five different regressions consisting of Linear, k-Nearest Neighbor, Decision Tree, Support Vector, and Multi-layer Per-ceptron regression. The obtain results show that the k-Nearest Neighbor regression computed the lowest distance error of 10.53, compared to the other regression algorithms.

DOI： 10.1109/BMEiCON47515.2019.8990326