Anyhow, here are the numbers from the last Langley trip:
Day 1- Horseshoe Meadows @ 5-ish PM- 93/73 O2 Sat/Pulse
Day 2- Horseshoe Meadows @ 8-ish AM- 95/75
Day 2- Horseshoe Meadows @ 5-ish PM- 97/68
Day 3- Top of Old Army Pass @ 9-10 AM- 91/109
Day 3- Langley Summit @ Around noon- 85/110
Day 3- Whitney Portal @ 7-ish PM- 96/85
Day 4- Whitney Portal @ 7-ish AM- 98/80
Day 11- Home @ 3:00 PM- 99/61
By comparison, my friend's O2 saturation on the summit of Langley was fluctuating around the mid-90s, and his heart rate was in the mid-80s.
My quick interpretation:
Normal Sat for you is about 99 (as for most people)
Note the drop to 93 on day 1, but gradually going up the next two days, as you are acclimatizing. But you aren't there yet.
Your heart rates for those days are elevated above your baseline of 61....your body is compensating normally by increasing heartrate.
At NAP, a significant elevation gain, your Sat drops accordingly, and your heartrate is up even higher (assuming you've rested long enough for it to come down from your effort)
On the summit, your sat drops even more from decr oxy. Your Heartrate is still up compensating.
Down at 3 Whitney Portal, you have continued to acclimate, so your Sat is now almost normal, and your HR is still up, compensating.
At 4 WP, your sat continues to approach normal, and your HR is continuing to drop. Were you to stay longer, it would continue down until finally reaching your baseline in the 60's
That's my "quick and dirty" look at it.
