筋肉飽和度ブレイクポイントと乳糖値との一致:世界クラスのノルディックスキーヤーにおける筋肉の比較と性別の違い
Jonas Forot1,2,3, Forrest Schorderet1, Cyril Burdet3
1Institute of Sport Sciences, University of Lausanne, Lausanne, Switzerland.
Experimental physiology
|February 12, 2026
まとめ
近赤外線光譜法 (NIRS) は,北欧のエリートスキーヤーにおける第2乳酸値 (LT2) を正確に検出することができます. この非侵襲的な方法のための最適なNIRS配置は,バイセプス・ブラキアとバイセプス・フェモリスの筋肉です.
科学分野:
- 運動生理学 運動生理学
- スポーツ科学 スポーツ科学
- バイオメディカルエンジニアリング
背景:
- 近赤外線光譜法 (NIRS) は,筋肉の酸素量を測定する非侵襲的な技術です.
- 乳酸値 (LT) の決定は,耐久力トレーニングの最適化に不可欠です.
- ノルディックスキーにおける LT 決定のための最適な NIRS センサーの配置は確立されていません.
研究 の 目的:
- 乳酸値 (LT1, LT2) に相当するブレイクポイント (BP1, BP2) を特定するNIRSの精度を評価する.
- 異なる筋肉部位 (大腹側筋,二頭筋,二頭筋,三頭筋) でのNIRSのパフォーマンスを比較する.
- エリートな男女の北極スキーヤーにおけるNIRSの可行性を評価する.
主な方法:
- 52人のエリートなノルディックスキー選手が,ローラースキーのトレッドミルのテストを受けた.
- NIRSセンサーは,VL,BF,BB,TBで筋肉の酸素飽和度 (SmO2) をモニターした.
- NIRSで得られたブレイクポイント (BP1,BP2) と,実験室で決定された乳酸値 (LT1,LT2) を比較した.
主要な成果:
- BP1の検出は信頼性がなく,実用的な応用が限られていた.
- BP2はvastus lateralis (88.5%),バイセプスフェモリス (96.2%),バイセプスブラキ (86.5%) で正確に検出されたが,トリセプスブラキ (24.1%) では検出されなかった.
- VL,BF,およびBBでBP2対LT2の高精度が観察され,心拍数でのバイアスは最小でした.
結論:
- NIRSは,エリートな北欧スキーヤーにおける第2乳酸値 (LT2) を検出するための有効な非侵襲的ツールです.
- バイセプス・ブラキアとバイセプス・フェモリスは,NIRSベースのLT2決定のために推奨される筋肉部位です.
- LT2検出のNIRSのパフォーマンスは,このコホートにおいて,性別による有意な差異を示さなかった.
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