Naoki Matayoshiの 'spark' とJohn J. Rateyの "SPARK" を同時期に読み、その時のメモが混ざってしまったので次に引用する文はどちらの作品からなのか分からなくなりました。
At high intensity, between 75 an 90 percent of your maximum heart rate, your body enters into a full-fledged state of emargency, and its response is appropriately powerful. It's also within this range, usually at the upper end, that metabolism shifts from aerobic to anaerobic, in which your muscles go into a state of hypoxia because they can't pull enough oxygen from the bloodstream.
内容からするとJohn J. Rateyの "SPARK" の話の様ですが？ それはともかく "hypoxia" の意味を調べます。
・Oxford English Dictionary: Deficiency in the amount of oxygen reaching the tissues.: Oxygen is cheap, widely available, and used in a range of settings and conditions to relieve or prevent tissue hypoxia.
・Merriam-Webster Dictionary: a deficiency of oxygen reaching the tissues of the body: But many birds that headed for the cleaner, thinner air responded to extreme hypoxia just as their human counterparts did when moving from sea level to the Rockies and the Himalayas.
"hypoxia" は低酸素症（状態）を示している様ですが、コロナ感染で知るようになったパルスオキシメーターを連想しました。それでWikipediaを読むと次の説明がありました。以下はそのほんの一部の抜粋です。
Pulse oximetry is a noninvasive method for monitoring a person's oxygen saturation. Peripheral oxygen saturation (SpO2) readings are typically within 2% accuracy (within 4% accuracy in the worst 5% of cases) of the more desirable (and invasive) reading of arterial oxygen saturation (SaO2) from arterial blood gas analysis.
...
Pulse oximetry also is not a complete measure of circulatory oxygen sufficiency. If there is insufficient blood flow or insufficient hemoglobin in the blood (anemia), tissues can suffer hypoxia despite high arterial oxygen saturation.
At high intensity, between 75 an 90 percent of your maximum heart rate, your body enters into a full-fledged state of emargency, and its response is appropriately powerful. It's also within this range, usually at the upper end, that metabolism shifts from aerobic to anaerobic, in which your muscles go into a state of hypoxia because they can't pull enough oxygen from the bloodstream.
内容からするとJohn J. Rateyの "SPARK" の話の様ですが？ それはともかく "hypoxia" の意味を調べます。
・Oxford English Dictionary: Deficiency in the amount of oxygen reaching the tissues.: Oxygen is cheap, widely available, and used in a range of settings and conditions to relieve or prevent tissue hypoxia.
・Merriam-Webster Dictionary: a deficiency of oxygen reaching the tissues of the body: But many birds that headed for the cleaner, thinner air responded to extreme hypoxia just as their human counterparts did when moving from sea level to the Rockies and the Himalayas.
"hypoxia" は低酸素症（状態）を示している様ですが、コロナ感染で知るようになったパルスオキシメーターを連想しました。それでWikipediaを読むと次の説明がありました。以下はそのほんの一部の抜粋です。
Pulse oximetry is a noninvasive method for monitoring a person's oxygen saturation. Peripheral oxygen saturation (SpO2) readings are typically within 2% accuracy (within 4% accuracy in the worst 5% of cases) of the more desirable (and invasive) reading of arterial oxygen saturation (SaO2) from arterial blood gas analysis.
...
Pulse oximetry also is not a complete measure of circulatory oxygen sufficiency. If there is insufficient blood flow or insufficient hemoglobin in the blood (anemia), tissues can suffer hypoxia despite high arterial oxygen saturation.
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