クレンチングが咬筋の皮膚表面血流と筋内血流に及ぼす影響 [in Japanese] The Effect of Clenching on Surface Blood Flow and Intramuscular Blood Flow of Masseter Muscle [in Japanese]
Access this Article
Search this Article
目的: クレンチングが咬筋の皮膚表面血流と筋内血流に及ぼす影響を明らかにする目的で, 測定深度が異なる2種類の血流計を用いて, クレンチング時の咬筋の皮膚表面血流と筋内血流を計測し, 心拍を加えて分析した.<BR>方法: 正常者20名の中等度クレンチング時の咬筋の皮膚表面血流, 筋内血流, 心拍について, クレンチング開始前, 開始10-50秒後, 終了10-50秒後, 終了1-5分後を計測し, クレンチング前・中・後の変化を調べた.<BR>結果: 皮膚表面血流の相対%は, クレンチング開始後順次大きくなり, 50秒後で最大値を示した (p<0.01) が, 終了後, 速やかに小さくなり, 終了1分後で開始前の値にほぼ回復した.一方, 筋内血流の相対%は, 開始後小さくなった (p<0.01) が, 終了10秒後で著明に大きくなり, その後順次小さくなり, 終了3分後で開始前の値にほぼ回復した.なお, クレンチング中では, 40, 50秒後でわずかながら順次大きくなる値を示した.また, 心拍の相対%は, クレンチング中で大きくなり (p<0.01), 50秒後で最大値を示したが, その後速やかに小さくなり, 終了20秒後で開始前の値にほぼ回復した.なお, クレンチング中では, わずかではあるが, 順次大きくなる傾向を示した.<BR>結論: クレンチング時における咬筋の皮膚表面血流と筋内血流は, ともに心拍の増加と咬筋への血液の動員によって生じるが, 異なる変化を示すことが示唆された.
Purpose: In order to clarify the relation between blood flow and masseter muscular activities, two types of blood flow measuring device having a difference in the depth of measurement were used to measure surface blood flow and intramuscular blood flow of the masseter muscle during clenching, and the results were analyzed in conjunction with heart rate.<BR>Methods: The heart rate, and intramuscular and surface blood flows of the masseter muscle, during medium clenching by 20 healthy subjects, were measured prior to clenching, at 10 to 50 seconds into clenching, at 10 to 50 seconds after clenching, and at 1 to 5 minutes after clenching, and the changes in blood flow before, during, and after clenching were investigated.<BR>Results: The relative percentage of surface blood flow increased steadily upon clenching and reached a maximum value at 50 seconds into clenching (p<0.01); it decreased steadily upon ceasing clenching, and returned to its initial value at 1 minute after ceasing clenching. On the other hand, the relative percentage of intramuscular blood flow decreased upon clenching (p<0.01); it increased dramatically at 10 seconds after ceasing clenching, decreased thereafter, and returned to its initial value at 3 minutes after ceasing clenching. At about 40 to 50 seconds into clenching, the blood flow increased steadily, though only slightly. The relative percentage of heart rate increased during clenching (p<0.01), showed a maximum value at 50 seconds into clenching, decreased quickly thereafter, and returned to its original value at 20 seconds after ceasing clenching. During clenching the heart rate showed a tendency to steadily increase, though only slightly.<BR>Conclusions: It was concluded that, though both the surface blood flow and intramuscular blood flow of the masseter muscle during clenching were caused by an increase in the heart rate and a surge in blood flow into masseter muscle, they differ in the way their flow changes.
- Nihon Hotetsu Shika Gakkai Zasshi
Nihon Hotetsu Shika Gakkai Zasshi 45(4), 467-475, 2001-08-10
Japan Prosthodontic Society