長期航海船舶乗組員の骨量変化
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(3). *,ῌ *,ῌ*-ῌ. *,ῌ *-ῌ . *.ῌ! " # $*.. Long-Term Voyages and Bone Mass Among Seamen ABO Junichi*+, KOIKE Yoshio*,, NODA Akira*-, HAYASHI Toshifumi*,, HAMADA Hiroaki*,, YAMASAKI Saeko*-, MINE Yuji*-, KITAZAWA Akira*,, HAGITA Ryuichi*-, UCHIDA Keiichi*. and MURAMATSU Sonoe*. %Received June ,*, ,**-& The purpose of this study is to determine the influence of limited life space during long-term voyages to human’s bone mass. The participants of this study were .2 seamen of two research and training vessels, Umitaka-maru and Shinyo-maru, of Tokyo University of Fisheries. The bone mass of their heel bones were measured using supersonic waves, in addition to height and weight before and after a long-term voyage. They were requested to count and record their walking steps daily with pedometers during their voyage. After the voyage the mean value of everyone’s bone mass decreased -.,+ῌ. Though the bone mass of the seamen on the Umitaka-maru had not changed, those of the Shinyo-maru decreased /.3/ῌ. The seamen of Umitaka-maru walked more (+*31/.2 steps a day) during the voyage compared to the seamen of Shinyo-maru (2-3/./ steps a day). Umitaka-maru has a 1- storied structure and Shinyo-maru a -- storied structure, so the seamen of Umitaka-maru had to walk more steps and to go up and down more stairs every day. This caused the di#erence in the bone mass. We propose exercising which includes horizontal as well as vertical movements for seamen who participate in long-term voyages in order to avoid loss of bone mass. Key words :. +' (. Seaman, Bone mass, Walking steps. ).
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