This post is a place to share your personal findings on pulse oximetry data.
I'll gather up a bit more information to post in a week or so, but here is a start:
My home (~5000 ft. elevation) readings (about six days of data readings) on oximetry ranges between 97-98% for me (96-97% for Del, my husband that does not have asthma and he is not an endurance critter). Arrival to Frisco, Colorado I was 91-92% pre-asthma meds (Del@ 95%). Same day I was 95% post-asthma meds and post-skiing.
The next morning I was at 94% pre-asthma meds, 97% just 30-minutes post-asthma meds, 93% at 9:30 pm (about 12 hours after asthma meds). The third morning at Frisco, near 48 hours after being at altitude I was bouncing between 96-97% pre-asthma meds. The next two days at Frisco produced the similar results at 95-96%. Returning home, I was pretty consistently at 98% every morning for four mornings. Know that I've been at altitude about once every 21-28 days for the last year. I'm there an average of two days at a time. It would be interesting to see numbers for me about 1.5 years ago before the monthly altitude pops. June of 2009, I really felt the altitude with almost a year of non-exposure I was huffing and puffing going up two flights of stairs. Exercise intensity was quite compromised.
For this schtick at altitude, Del remainded pretty consistent at 92-95% in Frisco, 95-96% at home. His reduction was less than mine. Asthma? Or just individual differences in tolerance?
Comments or data sharing are certainly welcome here ~
It has been known for some time that caffeine has a positive effect on athletes that experience exercise-induced asthma (also known as exercise-induced bronchoconstriction). A recent study published by the International Journal of Sports Medicine, “Comparative Effects of Caffeine and Albuterol on the Bronchoconstrictor Response to Exercise in Asthmatic Athletes” found that moderate (6mg/kg) to high (9mg/kg) doses of caffeine provided a “significant protective effect against EIB”.
The study was conducted on ten asthmatic subjects. Though the sample size was relatively small, it was a randomized, double-blind, double-dummy crossover study. One hour pre-exercise, subjects were given 0, 3, 6, or 9mg/kg of caffeine or a placebo. Then, fifteen minutes pre-exercise subjects were given albuterol or a placebo. Scientists administered pulmonary function tests pre-and post-exercise to evaluate effectiveness of albuterol plus caffeine, albuterol plus caffeine placebo, caffeine plus albuterol placebo and placebo.
While caffeine only did provide some positive effects, caffeine did not seem to improve the affects of albuterol.
If you experience EIA/EIB, it might be worth reviewing the results of this study with your doctor. The study concluded that negative effects of daily use of short-acting beta2-agonists could be reduced by increasing caffeine consumption prior to exercise.
To find your weight in kg, divide weight in pounds by 2.2