Term
| What happens to the respiratory parameters w/ aerobic activity? |
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Definition
| Increased tidal volume and increased RR --> Increased minute volume. |
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Term
| Why does expiration take longer than inspiration when at rest? |
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Definition
| Because it's a passive process, so flow is slower and it takes longer. |
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Term
| Which decreases more with increasing RR: inspiratory time or expiratory time? Why? |
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Definition
| Expiratory time decreases more than insp. does, because expiration often becomes active to clear the lungs of CO2. |
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Term
| What happens to the inspiratory reserve and expiratory reserve volumes as tidal volume increases? |
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Definition
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Term
| As exercise becomes more intense, and you're trying to squeeze a little bit more out of the lungs, do you decrease IRV or ERV? |
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Definition
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Term
| What happens to the normal V/Q mismatch in the lungs with exercise? How? |
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Definition
| It decreases because you're opening more air spaces at the bottom of the lung and increasing the number of open capillaries, improving blood flow and gas exchange in the lung. |
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Term
| There are only two parameters that decrease in the lung during exercise. What are they? |
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Definition
| Alveolar ventilation and dead space. |
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Term
| Why is it important to clear CO2? |
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Definition
| Otherwise pH will change, and enzymes need a stable pH to function properly and efficiently. |
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Term
| How do the O2-Hb dissociation curve and the CO2-Hb dissociation curve compare? |
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Definition
| O2Hb = sigmoidal; CO2Hb = linear |
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Term
| What happens to the O2 Hb dissociation curve during exercise? What is it called? Why does it happen? |
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Definition
| It shifts to the right. IT's called the Bohr Effect. It happens because of an increase in pH and temperature, which facilitates offloading of O2 into muscle tissues. |
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Term
| What is the Haldane Effect? |
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Definition
| The higher the pO2, the less Co2 is in the blood. |
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Term
| What happens to Hb's affinity for CO2 when pO2 increases? |
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Definition
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Term
| What is the role of humoral factors in ventilation during exercise? |
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Definition
| It provides fine-tuning, probably from potassium and changes in pH. |
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Term
| What 2 things are responsible for the large increase in ventilation caused by neural factors at the beginning of exercise? |
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Definition
| Anticipation, and joint and muscle receptors. |
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Term
| What happens to ventilatory threshold with training? |
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Definition
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Term
| Lactate threshold and vetilatory threshold correspond in such a way that ventilatory threshold is often used as an indication of OBLA. But even people who don't produce lactate still have a ventilatory threshold. We don't know why. |
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Definition
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Term
| What is the ventilatory equivalent? |
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Definition
| Ratio of minute ventilation to O2 uptake (Ve/VO2) |
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Term
| What is the relationship between Ve and VO2 during rest --> moderate exercise? |
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Definition
| It increases linearly, about 25:1. |
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Term
| What is the relationship between Ve and VO2 during intense exercise? |
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Definition
| Ve increases exponentially, to 35-40:1. |
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Term
| At what percentage of VO2 Max does the ventilatory equivalent increase exponentially? |
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Definition
|
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Term
| VOCAB: Ventilatory Threshold |
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Definition
| Point at which Ve/VO2 is no longer linear. |
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Term
| Which will have a higher minute ventilation at a given workload? UE or LE? |
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Definition
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