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The Water Cooler
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59 years old and the heat is finally getting to me.
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<blockquote data-quote="okcBob" data-source="post: 4093170" data-attributes="member: 45783"><p>Not too sure about humid air causing dyspnea is due to low oxygen levels. Don’t get that logic. There might be a very tiny decrease in room air oxygen amount (20.9%) caused by high humidity, but the difference is so small as to be negligible at sea level. It’s not like on a muggy day the air oxygen levels drop to 16% instead of 20.9% on a dry day-which would definitely drop our blood o2 levels. Also when we breathe in, our bodies naturally humidify the inspired air to 100% humidity at body temp by the time the air gets to our lungs. So, the air in our lungs is at 100% relative humidity regardless if we inspire moist or dry air.</p><p>I think the cause of fatigue on hot humid days is because of evaporation difficulties. The body works to maintain a normal temperature. On hot muggy days, we need to use extra energy (calories) to cool down due to the evaporation & dehydration, which makes us more tired and possibly short of breath. People with chronic lung disease are especially susceptible to hot humid weather.</p><p>Anyway, expending more energy seems more likely than</p><p>low oxygen levels as a cause of breathing harder on hot muggy days. But, might be off base as well. Who knows.<img class="smilie smilie--emoji" loading="lazy" alt="😁" title="😁" src="https://cdn.jsdelivr.net/joypixels/assets/8.0/png/unicode/64/1f601.png" /></p></blockquote><p></p>
[QUOTE="okcBob, post: 4093170, member: 45783"] Not too sure about humid air causing dyspnea is due to low oxygen levels. Don’t get that logic. There might be a very tiny decrease in room air oxygen amount (20.9%) caused by high humidity, but the difference is so small as to be negligible at sea level. It’s not like on a muggy day the air oxygen levels drop to 16% instead of 20.9% on a dry day-which would definitely drop our blood o2 levels. Also when we breathe in, our bodies naturally humidify the inspired air to 100% humidity at body temp by the time the air gets to our lungs. So, the air in our lungs is at 100% relative humidity regardless if we inspire moist or dry air. I think the cause of fatigue on hot humid days is because of evaporation difficulties. The body works to maintain a normal temperature. On hot muggy days, we need to use extra energy (calories) to cool down due to the evaporation & dehydration, which makes us more tired and possibly short of breath. People with chronic lung disease are especially susceptible to hot humid weather. Anyway, expending more energy seems more likely than low oxygen levels as a cause of breathing harder on hot muggy days. But, might be off base as well. Who knows.😁 [/QUOTE]
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