身体活動は,高齢のアスリートにおける酸化窒素の可用性の年齢関連の障害を予防します
S Taddei1, F Galetta, A Virdis
1Department of Internal Medicine, University of Pisa, Pisa, Italy. s.taddei@int.med.unipi.it
Circulation
|June 28, 2000
まとめ
定期的な身体活動は,窒素酸化物の可用性を改善し,酸化ストレスを軽減することにより,年齢に関連する内皮機能障害を予防することができます. 運動は,高齢者の健康な血管機能を保ちます.
科学分野:
- 心血管の生理学 心血管の生理学
- 老化に関する研究.
- 内皮の機能は,内皮の機能である.
背景:
- 老化は,心血管疾患のリスクの増加と内皮機能不全と関連しています.
- 内皮機能不全は,血管拡張の障害に寄与する.
- 運動は,内皮に依存する血管拡張を改善することが知られている.
研究 の 目的:
- 長期の身体活動が,年齢に関連する内皮機能不全を予防できるかどうかを調査する.
- 若年,高齢の静止体やスポーツ選手の内皮機能を比較する.
- 年齢に関連した内皮の変化における酸化窒素酸化物と酸化ストレスの役割を解明する.
主な方法:
- ストレインゲージ・プレチスモグラフィーは前腕の血流量を測定するために使用されました.
- 内括約筋内アセチルコリンを注入して,内皮に依存する血管拡張を評価した.
- 酸化窒素合成酵素阻害剤 (L-NMMA) と抗酸化物質 (ビタミンC) が,メカニズムを調査するために使用されました.
主要な成果:
- 年配の被験者は,若い被験者と比較してアセチルコリンに対する鈍化した血管拡張を示した.
- 高齢のアスリートの身体活動は,アセチルコリン誘発の血管拡張を部分的に保存しました.
- 座っている高齢者の場合,ビタミンCは血管拡張を改善し,L-NMMA抑制を回復させ,酸化ストレスへの関与を示唆しました.
結論:
- 定期的な身体活動は,年齢による内皮機能不全を軽減することができます.
- 運動は,酸化窒素の可用性を高め,酸化ストレスを軽減することによって,内皮機能を保ちます.
- 研究結果は,血管の老化に対する身体活動の保護的役割を強調しています.
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