高齢者のactigraphyに基づく身体活動の訪問ごとの変化と認知老化との同時関連性
Ranjani P Shankar1, Rowan Saloner1, Coty Chen1
1Department of Neurology, Edward and Pearl Fein Memory and Aging Center, University of California, Weill Institute for Neurosciences, San Francisco, CA, USA.
Neurobiology of aging
|January 21, 2026
まとめ
1日の歩数増加は、高齢者の実行機能の向上と抑うつ症状の軽減に関連しています。これは、身体活動(PA)が時間の経過とともに認知老化と精神的健康にどのように影響するかを強調しています。
科学分野:
- 神経科学
- 老年医学
- 公衆衛生
背景:
- 身体活動(PA)は、認知症リスクの低減におけるその役割で認識されています。
- PAを脳および認知老化とともに客観的に測定する縦断的研究は少なく、脳と行動の関連における時間性の理解を制限しています。
研究 の 目的:
- 客観的に測定された身体活動(1日の歩数)の変化と、高齢者の認知機能(記憶、実行機能)、脳構造(海馬体積、白質高信号)、および抑うつ症状の変化との間の縦断的関係を調査すること。
主な方法:
- 107人の高齢者が年間の神経心理学的検査と脳MRIを受けました。
- 客観的なPAは、複数の研究訪問にわたる30日間のFitbitモニタリングを使用して測定されました。
- 線形混合効果モデルは、経時的な歩数変化と脳/認知アウトカムとの関連を分析しました。
主要な成果:
- 1日あたりの歩数の個人内増加は、実行機能の向上(標準β=0.128、p≤0.001)および抑うつ症状の軽減(標準β=-0.201、p≤0.001)と有意に関連していました。
- 記憶、海馬体積、または白質高信号との間に統計的に有意な縦断的関連は見られませんでした。
結論:
- 身体活動の変化は、高齢者のリアルタイムの認知低下リスクに影響を与える可能性があります。
- Actigraphyに基づく運動モニタリングは、老化に関連する早期の神経行動変化を検出する可能性を示しています。
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