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抄録 1卵性4組(No.1-4)および2卵性3組(No.5-7)の男子双生児(平均年齢16歳)に対し,終夜睡眠中の睡眠紡錘波の分析を行った。身長,体重,足底長および胸囲を計測し,これらの身体指標と睡眠紡錘波との相関関係を調べた。身体指標は,No.4を除く1卵性双生児と1組の2卵性双生児(No.5)の兄弟間では類似していたが,2組の2卵性双生児(No.6と7)の兄弟間では異なっていた。睡眠紡錘波数と睡眠紡錘波出現率は1卵性双生児と1組の2卵性双生児(No.5)の兄弟間では,ほとんど一致していたが,2組の2卵性双生児(No.6と7)の兄弟間では一致しなかった。睡眠紡錘波数および睡眠紡錘波出現率はともに体重と逆相関を示した(r=−0.61,p<0.02;r=−0.62,p<0.02)。これらの事実は,睡眠紡錘波が遺伝性よりもむしろ個人の発育を反映していることを示唆する。
In 4 identical (Nos.1-4) and 3 fraternal (Nos.5-7) male twin pairs (mean age, 16 years), sleep spindles were analysed during sleep. The height, body weight, plantar length and chest circumference were measured, and the correlations between sleep spindles and these physical parameters were examined. The physical parameters showed con-cordance between identical twin pairs except one pair (No. 4) and one fraternal pair (No. 5) but discordance between two fraternal twin pairs (Nos. 6 and 7). Number of sleep spindles and sleep spindle density showed almost concordance be-tween identical twin pairs and one fraternal pair (No. 5), while discordance between two fraternal ones (Ncs. 6 and 7). Both number of sleep spindles and sleep spindle density were inversely correlated with body weight (r=-0.61, p<0.02; r==-0.62, p<0.02). These facts would suggest that sleep spindles rather reflect the individual development than genetic trait.
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