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ミウラ
- 2020年2月6日
- 3 分
意外と知らない自律神経のお話②――交感神経と副交感神経
自律神経のお話①では、自律神経が自分の意思では動かせないもので、私たちの生命活動の根幹を成すものであることをお話ししました。 自律神経は、交感神経と副交感神経という相反する働きによってコントロールされています。 わかりやすく車の機能に例えると、アクセルが交感神経、ブレーキが副交感神経に当たります。 運動したり仕事をしたりして活動が活発になると交感神経が優位に働くので、これがアクセル。 くつろいでる時や眠っている時にはリラックスモードになり副交感神経が働くので、これがブレーキの役割を担います。 車を安全に運転するためには、どちらが大事ということではなく、両方の機能がきちんと働くことが必要なように、私たちの体も交感神経と副交感神経が両方バランスよく働くことが大切です。 基本的に、日中は活動モードになるので交感神経がやや優位に働き、夕方から夜にかけては副交感神経がやや優位になって、心身を休めるモードに変わるのが健康的なサイクルです。 二つの自律神経はバランスが大事で、どちらか一方が極端に高くなるのは不健康な状態と言えます。 特に交感神経が高く、副交感神
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