Nagoya-shi, Japan
Nagoya-shi, Japan

Aichi Toho University] is a private university in Meitō-ku, Nagoya, Aichi Prefecture, Japan. The predecessor of the school was founded in 2001. The present name was adopted in 2007. Wikipedia.

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Kuzuhara K.,Aichi Toho University | Kuzuhara K.,Nagoya University | Shibata M.,University of Hyogo | Uchida R.,Nagoya University
Journal of Athletic Training | Year: 2016

Context: Mini-basketball is one of the most popular junior sports in Japan. Mini-basketball-related injuries may increase because of early specialization. However, no reports have been published to date concerning basketball injuries in children younger than 12 years of age. Objective: To prospectively study the incidence, sites, types, and mechanisms of injuries in mini-basketball teams. Design: Descriptive epidemiology study. Setting: Mini-basketball teams in Kobe, Japan. Patients or Other Participants: A total of 95 players in 7 community-based mini-basketball club teams (age range, 9 through 12 years). Main Outcome Measure(s): Data on all practice and game injuries for the 2013-2014 season were collected using an injury report form. Injury rates were calculated according to site, type, and mechanism. Results: The overall injury rate was 3.83 per 1000 athletehours (AHs). The game injury rate (12.92/1000 AHs) was higher than the practice injury rate (3.13/1000 AHs; P < .05). The most common anatomical areas of injury during games and practices were the head and neck (36.4%, 4.70/1000 AHs) and the upper limbs (47.8%, 1.50/1000 AHs). Sprains (42.9%, n=39) were the most common type of injuries overall, followed by contusions (29.7%, n = 27). Most game injuries resulted from body contact (45.5%, 5.87/1000 AHs), whereas most practice injuries resulted from other contact (56.5%, 1.77/1000 AHs). Conclusions: Game injury rates were higher than practice injury rates in Japanese mini-basketball players. The high practice injury rate in this study may be due to specific factors related to growth, such as individual differences in height, or to skills, such as inexperience in ball handling. © by the National Athletic Trainers' Association, Inc.


Ito R.,Nihon Fukushi University | Nakano M.,Aichi Toho University | Yamane M.,Aichi Mizuho College | Amano M.,Tokai Gakuen University | Matsumoto T.,Chukyo University
International Journal of Sports Medicine | Year: 2013

Environmental factors tend to influence the performance of individuals who exercise for extended periods. The present study aimed to determine energy metabolism while running in cold, wet conditions using a climatic chamber that can precisely simulate rainy conditions. 7 healthy men (age, 23.3±2.9 (SD) y; height, 168.6±7.5 cm; weight, 65.9±8.1 kg; V. O 2max, 52.0±5.7 mLkg- 1min- 1) ran on a treadmill at 70% ̇VO2max intensity for 30 min in a climatic chamber at an ambient temperature of 5°C in the presence (RAIN) or absence (CON) of 40 mm/h of precipitation. Expired air, esophageal temperature, heart rate, mean skin temperature, rating of perceived exertion and blood samples were measured. Esophageal temperature and mean skin temperature were significantly lower (P<0.05) in RAIN than in CON all. Minute ventilation, oxygen consumption and levels of plasma lactate and norepinephrine were significantly higher (P<0.05) in RAIN than in CON. In conclusion, the higher oxygen consumption and plasma lactate in RAIN indicated that energy demand increases when running in cold conditions. © 2013 Georg Thieme Verlag KG Stuttgart · New York.


Saiki T.,Japan Aerospace Exploration Agency | Sawada H.,Japan Aerospace Exploration Agency | Okamoto C.,Japan Aerospace Exploration Agency | Yano H.,Japan Aerospace Exploration Agency | And 3 more authors.
Acta Astronautica | Year: 2013

A Japanese spacecraft, Hayabusa2, the successor of Hayabusa, which came back from the Asteroid Itokawa with sample materials after its 7-year-interplanetary journeys, is a current mission of Japan Aerospace Exploration Agency (JAXA) and scheduled to be launched in 2014. Although its design basically follows Hayabusa, some new components are planned to be equipped in Hayabusa2 mission. A Small Carry-on Impactor (SCI), a small explosive device, is one of the challenges that were not seen with Hayabusa. An important scientific objective of Hayabusa2 is to investigate chemical and physical properties of the internal materials and structures. SCI creates an artificial crater on the surface of the asteroid and the mother spacecraft observes the crater and tries to get sample materials. High kinetic energy is required to creating a meaningful crater. The SCI would become complicated and heavy if the traditional acceleration devices like thrusters and rocket motors are used to hit the asteroid because the acceleration distance is quite large and guidance system is necessary. In order to make the system simpler, a technology of special type of shaped charge is used for the acceleration of the impact head. By using this technology, it becomes possible to accelerate the impact head very quickly and to hit the asteroid without guidance system. However, the impact operation should be complicated because SCI uses powerful explosive and it scatters high speed debris at the detonation. This paper presents the overview of our new small carry-on impact system and the impact operation of Hayabusa2 mission. © 2012 Elsevier Ltd. All rights reserved.


Sato H.,Daido University | Narita R.,Aichi Toho University
Procedia Computer Science | Year: 2013

Supporting aggregate range queries on remote spatial databases suffers from 1) huge and/or large numbers of databases, and 2) limited type of access interfaces. This paper applies the Regular Polygon based Search Algorithm (RPSA) to effectively addressing these problems. This algorithm requests a series of k-NN queries to obtain approximate aggregate range query results. The query point of a subsequent k-NN query is chosen from among the vertices of a regular polygon inscribed in a previously searched circle. Experimental results for maximum range query searches show that Precision is over 0.87 for a uniformly distributed dataset, over 0.92 for a skew-distributed dataset, and over 0.90 for a real dataset. Also, Number of Requests (NOR) ranges between 3.2 and 4.3, between 3.9 and 4.9, and between 3.0 and 4.2, respectively. © 2013 The Authors.


Sato H.,Daido University | Narita R.,Aichi Toho University
Frontiers in Artificial Intelligence and Applications | Year: 2014

Regular Polygon based Search Algorithm (RPSA) was developed for approximately processing aggregate queries on remote spatial databases. However, Precision regarding maximum queries is required to be more precise under comparison with that regarding sum queries. To this end, RPSA is revised by making it sensitive to farthest-point Voronoi regions with regard to a set of query points. Experimental results on the revised RPSA using synthetic and real datasets show that Precision regarding maximum k-Nearest Neighbor (k-ANN) queries ranges between 0.98 and 1.00. Also, Precision regarding maximum range queries ranges between 0.95 and 1.00. From these results, the revised RPSA successfully improve Precision of maximum queries which becomes nearly equal to Precision of sum queries. © 2014 The authors and IOS Press. All rights reserved.


Sato H.,Daido University | Narita R.,Aichi Toho University
Smart Innovation, Systems and Technologies | Year: 2015

Location Based Services (LBS) for supporting a group of mobile users are potentially promising. This article considers one of these LBS, which provides a group of mobile users, each at a different location, with location-dependent information in their neighborhood. Location-dependent queries, such as Aggregate k- Nearest Neighbor (k-ANN) queries and Aggregate Range queries, are indispensable to the LBS. However, supporting location-dependent queries suffers from two difficulties. One is concerned with access to several databases operating autonomously at remote sites. The other is concerned with simple and restrictive Web API interfaces to access the databases. A revised version of Regular Polygon based Search Algorithm (RPSA) is applied to overcome the difficulties, which requests a series of k-Nearest Neighbor (k-NN) queries to process approximate Aggregate Range queries on a single remote spatial database. RPSA is experimentally evaluated by applying it to Maximum Range queries which are a type of Aggregate Range queries. The results show that Precision is over 0.87 for uniformly distributed dataset and over 0.92 for skew-distributed dataset. Also, Number of Requests (NOR) ranges from 3.2 to 4.3, and from 3.9 to 4.9, respectively. Besides, the case study regarding the real dataset of public facilities shows that Precision is over 0.9 on the average, except in case of Maximum 10-th Range queries. On the other hand, NOR ranges from 3.5 to 4.3 on the average. © Springer International Publishing Switzerland 2015.


Sato H.,Daido University | Narita R.,Aichi Toho University
Frontiers in Artificial Intelligence and Applications | Year: 2013

Supporting aggregate range queries on remote spatial databases suffers from 1) huge and/or large number of databases, and 2) limited type of access interfaces. This paper proposes Regular Polygon based Search Algorithm (RPSA) to overcome these difficulties. RPSA requests a series of k-NN queries to obtain approximate aggregate range query results. The query point of a subsequent k-NN query is chosen among vertices of a regular polygon inscribed in a before-searched circle. Experimental results on sum range query search show that Precision is over 0.99 for uniformly distributed dataset, over 0.97 for skew-distributed dataset, and over 0.97 for real dataset. Also, Number of Requests (NOR) ranges between 3.1 and 3.9, between 3.4 to 4.3, and between 2.7 and 3.7, respectively. © 2013 The authors and IOS Press.


Sato H.,Daido University | Narita R.,Aichi Toho University
Smart Innovation, Systems and Technologies | Year: 2012

Processing sum k-Nearest Neighbor (NN) queries on remote spatial databases suffers from a large amount of communication. In this paper, we propose RQP-M search algorithm for efficiently searching sum k-NN query results to overcome the difficulty. It refines query results originally searched by RQP-S algorithm with subsequent k-NN queries, whose query points are chosen among vertices of a regular polygon inscribed in a before-searched circle. Experimental results show that Precision is over 0.99 for uniformly distributed data, over 0.95 for skew-distributed data, and over 0.97 for real data. Also, NOR (Number of Requests) ranges between 3.2 and 4.0, between 3.1 to 3.8, and between 2.9 and 3.5, respectively. Precision of RQP-M increases by 0.04-0.20 for uniformly distributed data, in comparison with that of RQP-S. © Springer-Verlag Berlin Heidelberg 2012.


PubMed | University of Tsukuba, Japan Institute of Sports science, Aichi Toho University and Toyo University
Type: Journal Article | Journal: Cell stress & chaperones | Year: 2016

This study aimed to identify the response of a salivary stress protein, extracellular heat shock protein (eHSP70), to intense exercise and to investigate the relationship between salivary eHSP70 and salivary immunoglobulin A (SIgA) levels in response to exercise. Sixteen healthy sedentary young males (means SD 23.8 1.5 years, 172.2 6.4 cm, 68.3 7.4 kg) performed 59 min of cycling exercise at 75% VO2max. Saliva and whole blood samples were collected before (Pre), immediately after (Post), and at 1, 2, 3, and 4 h after completion of the exercise (1, 2, 3, and 4 h). The salivary eHSP70 and SIgA levels were measured by enzyme-linked imunosorbent assay (ELISA), and the secretion rates were computed by multiplying the concentration by the saliva flow rate. White blood cells were analyzed using an automated cell counter with a direct-current detection system. The salivary eHSP70 secretion rates were 1.11 0.86, 1.51 1.47, 1.57 1.32, 2.21 2.04, 3.36 2.72, and 6.89 4.02 ng min(-1) at Pre, Post, and 1, 2, 3, and 4 h, respectively. The salivary eHSP70 secretion rate was significantly higher at 4 h than that at Pre, Post, 1, and 3 h (p < 0.05). The SIgA secretion rates were 26.9 12.6, 20.3 10.4, 19.6 11.0, 21.8 12.8, 21.5 11.9, and 21.9 11.7 g min(-1) at Pre, Post, 1, 2, 3, and 4 h, respectively. The salivary SIgA secretion rate was significantly lower between 1 and 4 h than that at Pre (p < 0.05). There was a positive correlation between salivary eHSP70 and SIgA in both concentration and secretion rates before exercise (p < 0.05). The absolute number of white blood cells significantly increased after exercise, with a maximum at 2 h (p < 0.05). The neutrophil/lymphocyte ratio was significantly increased from 1 to 4 h when compared with that in the Pre samples (p < 0.05). The present study revealed that salivary eHSP70 significantly increased at 4 h after the 59 min of intense exercise in sedentary male subjects. Exercise stress can induce elevated salivary eHSP70 level and upregulate oral immune function partially.


PubMed | Aichi Toho University
Type: Journal Article | Journal: Journal of strength and conditioning research | Year: 2016

Iguchi, J, Watanabe, Y, Kimura, M, Fujisawa, Y, Hojo, T, Yuasa, Y, Higashi, S, and Kuzuhara, K. Risk factors for injury among Japanese collegiate players of American football based on performance test results. J Strength Cond Res 30(12): 3405-3411, 2016-The purpose of this study was to identify how risk factors for injury during American football are related to players physical strength as determined using typical performance tests. One hundred 53 Japanese collegiate players of American football were recruited for this study. Eight potential risk factors were evaluated: position (skill vs. lineman), body mass index, back squat one-repetition maximum, vertical jump height, power, height, body weight, and previous injury. Using multivariate Cox regression, we examined how these factors were associated with knee sprain, ankle sprain, and hamstring strain. We recorded 63 injuries (17 knee sprains, 23 ankle sprains, and 23 hamstring strains). Players with higher power were at significantly greater risk for knee sprains (p = 0.04), those with low power had a significantly higher incidence of ankle sprain (p = 0.01), and vertical jump height was a significant predictor of hamstring strain (p = 0.02). We identified several independent predictors of injuries associated with American football. Our findings may contribute to the development of effective screening tests and prevention exercises.

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