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Sharp et al. 13 Biokinetic swim bench 22.86mCostill et al. 1 2 Biokinetic swim bench 22.86mToussaint et al. 21 MAD-•原著論文 簡易型測定装置を用いた泳パワー計測の有用性 Usefulness of swimming power measurement using simplified apparatus 〔abstract〕The aim of this study is to investigate the usefulness of a new swimming power measurement apparatus. This apparatus is called the Drag Boat (DB). DB is as large as a floating kickboard. The body is made of wood, and the load can be selected from five different levels. Drag force and swimming power can be calculated by measuring swimming velocity.Calibration of this system was performed using a towing apparatus (Active Drag System, ADS). Towing velocity was in the range of 0.4~2.2m/sec. The subjects were ten male competitive swimmers. They swam 25m front crawl at maximum effort under two conditions. One was conducted in free swimming, and the other was semi-tethered swimming using DB and ADS.Significant linear relationship was observed between drag force and swimming velocity when the subjects swam towing DB.The swimming power calculated using DB was found to be significantly correlated with velocity of 25m sprint swimming (r = 0.73, p<0.05). There was also a significant correlation between swimming power and velocity of 25m sprint swimming, which were calculated using ADS (r = 0.82, p<0.01). The swimming power calculated using DB and the swimming power calculated using ADS were found to have a significant correlation (r = 0.83, p<0.01). The above results show that power measurement using DB is efficient.

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A development of synthetic process via rare earth complex precursors was applied to a formation of rare earth manganites which can not be easily formed by conventional (normal) process. Several compounds of rare earth manganites with various structures were successfully synthesized by this method and their crystal structures were identified by powder X-ray diffractometry. Both of the orthorhombic and rhombohedral LaMnO3phases were prepared. LnMn2O5phase was more easily prepared by this method than by another method. The solid solution of (Sr,La)2MnO4phase for various compositions were tried to prepare a single phase, especially for a composition region Sr/La ratio < 1. since this phase is normally formed for only region of Sr/La ratio .. 1 by the solid state reaction method.