著者
新崎 知 細谷 聡 森 俊男
出版者
日本武道学会
雑誌
武道学研究 (ISSN:02879700)
巻号頁・発行日
vol.26, no.3, pp.41-49, 1994-03-30 (Released:2012-11-27)
参考文献数
8

The purpose of this paper was to examine correlations between efficiency of energy transfer and several indices obtained from strain gauges equipped with on a bow, and found a criterion to evaluate a shooter's technique with regard to the left hand. We analysed twisting moment and bending strain of a bow during a bow's restoration.The conclusions were as follows:1. The efficiency is significantly correlated with values of twisting moment of a bow in the latter part of the bow's restoration sequence, but not significantly correlated with values in the former part.2. The efficiency is significantly correlated with values of twisting moment integrated by time (P<.01), and with time when the maximum values of the moment is obtained (P<.05). However, it is not significantly correlated with the maximum value itself.3. Some spectrums of vibration of bending strain are negatively correlated with the efficiency, especially in the low frequency domain. The number of frequencies at which spectrums are positively correlated with the efficiency is obviously smaller than number of negative correlations. Vibration of twisting moment has little meanings in comparison with that of bending strain because of the magnitude of its energy.Some of these are widely known as an empirical law. Our conclusions are consistent with it.Consequently, the conditions of a shooter's technique to transform a bow's energy efficiently are regarded as follows:* Twisting moment integrated by time is large, and the maximum values of the moment is obtained in the latter part of the bow's restoration.* Vibration of a bow's bend in low frequency (especially, about 100Hz or 200Hz) is small.
著者
森 俊男
出版者
日本武道学会
雑誌
武道学研究 (ISSN:02879700)
巻号頁・発行日
vol.36, no.3, pp.9-18, 2004-03-31 (Released:2012-11-27)
参考文献数
23

I The purpose of this study was to compare:1. bow length,2. shape and size of grip3. grip position between Shosoin round wood bows (15 samples) and Oyamazumi Shrine composite bows (9 samples).II Differences in shooting techniques between the middle of the 8th and 14th Centuries were also examined.1. Relationship between drawing length (50,60,70,80,90 cm), grip position and angle of grip (angle between Blip and vertical line when in NOBIAI) was measured.2. Angle of grip while students were in full draw was also measured.3. Pictures of shooting scenes (Zanshin posture) in Japanese war roll paintings ware examined to determine how the left hand was used in those times. Conclusions from the comparison between bows from Shosoin and Oyamazumi Shrines were:1. Length of the bow increased from round wood bow to composite bow.2. Drawing length also increased.3. Grip position became higher.Differences in Kyudo techniques between both periods ware:1. Longer drawing arrow length in composite bow changed the way of aiming.2. Techniques of HOOZUKE and MUNAZURU started after the change to drawing longer arrows.3. Three pictures from two different kinds of War roll paintings made in the beginning of 13th Century described Tsunomi (Tenouchi) work were found.4. Reason of changing grip position for the composite bow was to adjust the angle of bow grip.If the same position as a round wood bow was used, to twist the bow in HANARE became difficult. Mobility of the left-hand wrist towards TSUNOMI direction became smaller when the wrist bent too far downwards.The change in bows design not only producced progress in bow efficiency but also in shooting techniques during the 13th Century.
著者
綾部 香子 森 俊男 関根 令夫
出版者
日本武道学会
雑誌
武道学研究 (ISSN:02879700)
巻号頁・発行日
vol.20, no.2, pp.161-162, 1987-11-30 (Released:2012-11-27)
参考文献数
6
著者
森 俊男 芳賀 脩光 松田 光生
出版者
日本武道学会
雑誌
武道学研究 (ISSN:02879700)
巻号頁・発行日
vol.22, no.3, pp.46-56, 1990-03-31 (Released:2012-11-27)
参考文献数
27

The purpose of this study was to investigate the cardiac dimensions and the influences of Kyudo practice in the function of the left ventricle and responses of cardiac function during shooting. The subjects were 14 shooters whose ages were 63-85 years (the average 68.8 years old) and even now they take part in formal Kyudo matches. Total body fat was assessed by the skinfold caliper method. The left venticular structure and function were measured using M-mode echocardiography and ECG during shooting were measured by the telemeter method. Results obtained were as follows.Subjects averaged 161.9 cm in height,59.7 kg in weight and 123.4 mmHg in systolic blood pressure. Time for shooting was about 30 seconds on the average, but the shortest time was 15 seconds, and the longest was 50 seconds. There were arrhythmia in 3 subjects at rest ECG. However, there were no differences in the ecocardiographic data between shooters and normal subjects. Arrhythmia disappeared in two subjects during shooting. The heart rate during shooting averaged 110 b/min, but one shooter recorded 180 b/min at maximal level.In summary, Kyudo practice is not so hard for old age shooters, but there is possibility that it builds up blood pressure, because it needs strong muscle activity during shooting. Therefore, old shooters must always take care of their medical condition.
著者
森 俊男 細谷 聡 松尾 牧則
出版者
日本武道学会
雑誌
武道学研究 (ISSN:02879700)
巻号頁・発行日
vol.21, no.2, pp.67-68, 1988-11-30 (Released:2012-11-27)
参考文献数
3