@article{oai:narasaho-c.repo.nii.ac.jp:00000064,
 author = {鶴見, 東志子 and 益田, 敦子 and 大石, 正 and TSURUMI, Toshiko and MASUDA,  Atsuko and OISHI, Tadashi},
 issue = {16},
 journal = {研究紀要, Bulletin of studies},
 month = {Mar},
 note = {ジャンガリアンハムスターは, 冬季において日中体温を約10-20℃減少させる日内休眠を示す.今回, 休眠と非休眠の状態において体温および歩行活動の概日およびウルトラジアンリズムの特徴を明らかにすることを試みた.実験の前に, 雄の成体ハムスターを長日・高温(LP-HT)においた, その後, 動物を短日・低温(SP-LT)に移し, 約6ヶ月の間, この条件のもとにおいた.実験中, 体重と摂食量をモニターした.歩行活動と体温のリズムをテレメーターシステムにより3分から5分間隔で記録した.SP-LTに対する反応において二つのタイプが認められた, すなわち, 体温を下げて日内休眠を示すタイプと体温を下げずに日内休眠を示さないタイプである.非休眠個体は実験期間中ずっと体温と歩行活動において概日リズムを示した.一方, 休眠個体は, 日内休眠を示す期間, 体温は概日リズムを示し, 歩行活動は概日リズムとウルトラジアンリズムの両方を示した.しかしながら, 非休眠時における休眠個体は,体温リズムは概日リズムとウルトラジアンリズムの両方の成分を示したが, 歩行活動リズムにおいては, ウルトラジアンリズムのみを示した.この概日リズムとウルトラジアンリズムの分離発現の機能的意味について検討した., The Djungarian hamster shows daily torpor that occurs in winter with decreased body temperature (about 10-20oC) during the daytime. We tried to elucidate the characteristics of circadian and ultradian body temperature and locomotor activity rhythms in torpid and non-torpid states. Adult male hamsters were kept in long photoperiod and high temperature (LP-HT) before the experiment and, thereafter, animals were transferred to short photoperiod and low temperature (SP-LT) and were kept in this condition for about six months. Body weight and food intake were monitored throughout the experiment. The rhythms of locomotor activity and body temperature were recorded every three or five minutes by using a telemetry system. There were two types of animals in the response to SP-LT, i. e., torpid animals that showed daily torpor with reduction of body weight and non-torpid animals that did not show daily torpor without reduction of body weight. Non-torpid animals always exhibited circadian rhythms in both body temperature and locomotor activity rhythms throughout the experimental period. Torpid animals, on the other hand, expressed a circadian component in body temperature rhythms and both circadian and ultradian components in locomotor activity rhythms during torpid days. Torpid animals during non-torpid days, however, showed both circadian and ultradian components in body temperature rhythms and only ultradian component in locomotor activity rhythms. We discussed the functional significance of differential expression of circadian and ultradian rhythms., 論文},
 pages = {11--21},
 title = {ジャンガリアンハムスター(Phodopus sungorus) の体温リズムと歩行活動リズムにおける日内休眠と関連した概日およびウルトラジアン成分の分離発現},
 year = {2009},
 yomi = {ツルミ, トシコ and マスダ, アツコ and オオイシ, タダシ}
}