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Old 02-23-19, 09:26 PM
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Doge
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Location: Southern California, USA
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Pulse Oximeter ~$35.
Every morning measure your resting HR. Notice your SPO2.
If you are elevated, back off.
On Bike / trainer ride till your SPO2 starts dropping. Easiest way to get an AT approximation.

Blood pressure cuff is good.
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