Recently martial arts have been much accounted of in junior and senior high schools, and are now holding an important position in the regular curriculum of physical education. On the other hand, injury accidents have increased in the practice of martial arts, especially in judo. There may be several reasons for the accidents in judo and hard mats in judo halls seem to be one of the factors. If the mats are suitably hard, it will be possible for students to do their positive exercises mentally and to improve their skills in judo remarkably. So we have examined the condition of mats in exercise halls of public junior and senior high school in Ishikawa Prefecture, and also asked instructors' opinions about mats, in order to know the appropriate hardness of mats, which will prevent accidents to acquire skills of judo. This is the research about the strength of shock by ukemi under various conditions of mats, as one step to find out the suitable hardness of mats for judo.
The purpose of this study was to investigate the relationship between victory or defeat of the Judo contest (3,299 match, team game of university students were held from May,1970 to June,1974) and grade (Dan), height, weight and Rohrer's index. On the same time, the authors analyzed the details of the contest too. The results may be summarized as follows: 1. The contests decided victory or defeat showed 63%, the residual game 37%ended in a draw. The percentage of a drawn game was ascending with increasing the tournament scale. 2. The decided performance elicited the greatest percentage in UCHIMATA, followed in order by OSOTO-GARI, SEOI-NAGE, HARAI-GOSHI, KAMISHIHO-GATAME and YOKOSHIHOGATAME. 3. According the difference increasing of grade, height, weight and Rohrer's index, the standings by win percentage of dominant Judoists was ascending, the drawn game decreased further. 4. It is satisfactory to the weight difference set up about 10 kg from the above mentioned results.
Many kinds of books have been published about Karate-do, but most of them may hardly satisfy our academic interest. Considering the remarkable development of Karate-do, however, we cannot help but feel the necessity of scientific study of Karate-do for Karate-do itself as well as for physical education at school. The present author has been sure that in the study of techniques in Karate-do it will be desirable and valid to adopt kinesiological and psychological approaches. Based upon such idea, he has reported his own theories of Karate-do in the annual congress of Japanese Academy of Budo for the last five years. The present paper has two purposes; one is to discuss the principles of the techniques of “sonoba-zuki” and “sonoba-geri”, which are regarded as the most fundamental offensive techniques in Karate-do, from the kinesiological point of view, and the other to discuss the important points for Karatedo's “kumite”. Several important points were discussed so that powerful “sonobazuki”“and” “sonoba-geri” could be done; the power of “hiki-ude” and standing leg, balance of body, moderate relaxation, and so on. For “kumite” several important matters were pointed out; basic mental set toward “kumite”, “kamae” (basic postures in Karate), “maai” (distance between the two karate-men), three aspects of offence in Karate-do, symmetry of basic postures and techniques (namely functional equivalence of right and left sides of the limbs), and principles of guard. In any way, scientific study of Karate-do has just begun, so the present author is eager for the rising tendency favourable for scientific researches in Karate-do.
The purpose of this study was to investigate relative metabolic rates of the subjects during three main exercises of Kendo (Uchikaeshi, Kakari-geiko and Match) and examine the VO2 rate during exercises to the VO, max. The sixteen subjects were all healthy girl students: four persons respectively from the third grade of primary school, the first of junior high school, the second of senior high school, and junior students of university. Douglas bag method was used for gas collecting. Expiration was analyzed with Scholander Micro-Gas Analyzer. The following results were obtained: 1. The relative metabolic rate during three exercises of Kendo increased according as the school year advanced. 2. The VO2 rate during three exercises of Kendo to Vol max (ml/mm/kg) was about 60 to 90%. 3. As to the oxygen debt rate to the oxygen requirement, during Kakari-geiko and Uchikaeshi the rate of oxygen debt was large and during match, the oxygen requirement was large.