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頁籤選單縮合
題 名 | 心跳減緩對潛水者安全的影響=The Effect of Bradycardia upon Security of Scuba Diving |
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作 者 | 高紹源; 張鳳儀; | 書刊名 | 運動休閒餐旅研究 |
卷 期 | 3:1 2008.03[民97.03] |
頁 次 | 頁88-94 |
分類號 | 528.9012 |
關鍵詞 | 潛水; 潛水生理學; 心跳; Diving; Diving physiology; Heart rate; |
語 文 | 中文(Chinese) |
中文摘要 | 當臉憋氣把臉浸入水中時,這時候會增加心臟的前負荷(preload)及後負荷(afterload),這是因爲這時候增加了胸內的血液量(intrathoracic blood volume)以及末稍血管的收縮(peripheral vasoconstriction)。心跳的降低主要是受到迷走神經(vagal tone)的副交感神經的影響。憋氣浸在水中時,末稍血管的阻力增加百分之二十六到百分之五十三左右,同時血壓通常也增加,但是單位心跳的血液輸出量(cardiac output)郤沒有什麼變化,末稍血管的收縮及血壓的升高,主要是受到交感神經及荷爾蒙的影響。臉浸入冰冷的水中將會使心跳顯著的減慢。在人類,暫時停止呼吸以及對臉上冷受器的刺激,就可以說明大部分心跳減緩的原因。其他的原因可以解釋潛水的反應如剛下水的時候會有比較高的心跳次數、高新陳代謝率、在肺泡內低氧分壓,以及較大的肺體積。對於後者,如果樣本以關閉其聲門及放鬆其呼吸的肌肉來憋氣,如此內胸壁將可以產生較大的內胸壓,這樣的機制可以降低靜脈的血液回流。結果心單位心跳血液輸出量就會減少,同時引起心跳的減緩。 因此,能以憋氣把臉浸入冰冷水中時的生理變化,來探討人類潛入水中的生理變化,爲所要研究的主要課題。本研究主要分爲二部分:首先,在實驗室部分所收集的數據做爲基礎。再者爲田野調查,實地到海水中收集數據,比較實驗室與田野調是否有差異性及相關性。 |
英文摘要 | Breath-hold diving increased the preload and afterload since it increased the intrathoracic blood volume, and caused the peripheral vasoconstriction. The heart rate was decreased by vagal tone. The resistance of blood vessels increased 26% to 53% and the pressure compromised. However, the cardiac output was still in a steady state. The resistance and blood pressure of blood vessels increased being caused by sympathetic system. Face immersion in cold water caused the heart rate decreased significantly. Likewise, breath-hold facing a blast of cold wind stimulated the receivers on the face and caused the physiology responses, which explained the factors of decreasing the heart rate. The others, high initial heart rate, high metabolism, lower oxygen partial pressure in alveolar and larger volume in lung, would explain the responses of diving. Assuming the respiratory muscles were relaxed, at this lung volume the chest wall should recoil outwards reducing intrathoracic pressure, thus enhancing venous return. Also, cardiac out decreased and the heart rate compromised. In this case, the physiology responses of breath-hold diving indicating the physiology responses is the main issue of the study. There are two parts of the study: first, the baseline is the data collected in the laboratory; the second is the field study in the sea. Whether or not there is any relationship between baseline and data of field study. |
本系統中英文摘要資訊取自各篇刊載內容。