Resting vs. Max heart rate

mom2lillian · May 29, 2007

Sonia-very intersting. Thanks for posting the answer you got. Let us know when you find out from your CF docs too ok?

I was goign to tell you I dont blame you for not putting on o2 I wouldnt either and maybe get a treadmill at home but sounds like you will be ok either way.

I will have to do checking into my own circumstance here because my HR gets way above 60-70 beats higher than resting it is fine according to the HR link that someone put on here. Might have to ask about it at my next appt but I woudl rather ask a fitness expert as many docs are not well versted in the excercise physiology.

I agree with you it just doesnt feel as good if your HR doesnt get up there into the cardio range and not just in the fat burning range or whatever however I definately dont want to be doing damage when I am trying to do something good for my body. I will be intereted to see what your hubbies o2 sats are at, ask him to do a full bore few minutes and see what it goes too also <img src="i/expressions/face-icon-small-smile.gif" border="0">--for us!

mom2lillian · May 29, 2007

Sonia-very intersting. Thanks for posting the answer you got. Let us know when you find out from your CF docs too ok?

I was goign to tell you I dont blame you for not putting on o2 I wouldnt either and maybe get a treadmill at home but sounds like you will be ok either way.

I will have to do checking into my own circumstance here because my HR gets way above 60-70 beats higher than resting it is fine according to the HR link that someone put on here. Might have to ask about it at my next appt but I woudl rather ask a fitness expert as many docs are not well versted in the excercise physiology.

I agree with you it just doesnt feel as good if your HR doesnt get up there into the cardio range and not just in the fat burning range or whatever however I definately dont want to be doing damage when I am trying to do something good for my body. I will be intereted to see what your hubbies o2 sats are at, ask him to do a full bore few minutes and see what it goes too also <img src="i/expressions/face-icon-small-smile.gif" border="0">--for us!

mom2lillian · May 29, 2007

Sonia-very intersting. Thanks for posting the answer you got. Let us know when you find out from your CF docs too ok?

I was goign to tell you I dont blame you for not putting on o2 I wouldnt either and maybe get a treadmill at home but sounds like you will be ok either way.

I will have to do checking into my own circumstance here because my HR gets way above 60-70 beats higher than resting it is fine according to the HR link that someone put on here. Might have to ask about it at my next appt but I woudl rather ask a fitness expert as many docs are not well versted in the excercise physiology.

I agree with you it just doesnt feel as good if your HR doesnt get up there into the cardio range and not just in the fat burning range or whatever however I definately dont want to be doing damage when I am trying to do something good for my body. I will be intereted to see what your hubbies o2 sats are at, ask him to do a full bore few minutes and see what it goes too also <img src="i/expressions/face-icon-small-smile.gif" border="0">--for us!

mom2lillian · May 29, 2007

oh forgot to tell you what I logged on to say. I was watchign oprah after the show, an old tivo'd one and they had some docs on there talking abotu nutrition excercise etc. The ? was posed what do you eat before excercise and they said if you are working out hard not to eat fatty foods before you work out because it can inhibit your bodies ability to circulate blood I missed some of what they were sayign due to a fussy baby but basically the arteries are busy with working on the break down of the fat and cant dilate to the degree a hard workout requires.

Though I woudl look more into this if it is true that might be a very hand tip for the typcial cf'er since you have to eat so much fatty food to start with, perhaps some straight complex carbs before workout woudl be good?

mom2lillian · May 29, 2007

oh forgot to tell you what I logged on to say. I was watchign oprah after the show, an old tivo'd one and they had some docs on there talking abotu nutrition excercise etc. The ? was posed what do you eat before excercise and they said if you are working out hard not to eat fatty foods before you work out because it can inhibit your bodies ability to circulate blood I missed some of what they were sayign due to a fussy baby but basically the arteries are busy with working on the break down of the fat and cant dilate to the degree a hard workout requires.

Though I woudl look more into this if it is true that might be a very hand tip for the typcial cf'er since you have to eat so much fatty food to start with, perhaps some straight complex carbs before workout woudl be good?

mom2lillian · May 29, 2007

oh forgot to tell you what I logged on to say. I was watchign oprah after the show, an old tivo'd one and they had some docs on there talking abotu nutrition excercise etc. The ? was posed what do you eat before excercise and they said if you are working out hard not to eat fatty foods before you work out because it can inhibit your bodies ability to circulate blood I missed some of what they were sayign due to a fussy baby but basically the arteries are busy with working on the break down of the fat and cant dilate to the degree a hard workout requires.

Though I woudl look more into this if it is true that might be a very hand tip for the typcial cf'er since you have to eat so much fatty food to start with, perhaps some straight complex carbs before workout woudl be good?

cdale613 · May 29, 2007

Hi Sonia,

85 is definitely a little low... from what I've read, during aerobic exercise you should absolutely stay above 88, and as Amy mentioned before, a lot of dr.'s recommend staying above 90 or higher.

If you are really opposed to using O2 during your workouts, there are a few different things that might help you:

1) Can you run outside? The air quality will likely be better than your 80 degree recycled air gym, which might help. The scenery will keep changing too, which you might find you enjoy more. If at some point you find you need to use 02, it might be a lot more comfortable to use it outside than in the gym setting. Either way, once you tell one or two people why you're using it, they'll all think you're a champion.

2) Warm up SLOWLY. If you increase the amount of time you take to go from resting to walking, to walking faster, to running, your body will do a better job at keeping up with your oxygen needs, and may not drop as much when you start running.

3) Its possible, even likely, that you may have to slow down A LOT to keep your sats from dropping below 90. That lower intensity exercise is still valuable, but maybe not as much as the higher intenisity with a little help from oxygen.

What ever you do, I definitely think you should do whatever you can to keep exercising... its such a critical part of optimizing and maintaining lung health.

I don't know what my O2 sats do while I'm exercising, but I do train with heart rate, which I've used as a decent proxy. The increase of 60 beats rule your nurse mentioned is a very rough estimate of where you could expect your anaerobic threshold to be. Given that your resting heart rate is a little high, and you are desating, I would say its not a perfect fit for you.

Chris

26 m w/CF

cdale613 · May 29, 2007

Hi Sonia,

85 is definitely a little low... from what I've read, during aerobic exercise you should absolutely stay above 88, and as Amy mentioned before, a lot of dr.'s recommend staying above 90 or higher.

If you are really opposed to using O2 during your workouts, there are a few different things that might help you:

1) Can you run outside? The air quality will likely be better than your 80 degree recycled air gym, which might help. The scenery will keep changing too, which you might find you enjoy more. If at some point you find you need to use 02, it might be a lot more comfortable to use it outside than in the gym setting. Either way, once you tell one or two people why you're using it, they'll all think you're a champion.

2) Warm up SLOWLY. If you increase the amount of time you take to go from resting to walking, to walking faster, to running, your body will do a better job at keeping up with your oxygen needs, and may not drop as much when you start running.

3) Its possible, even likely, that you may have to slow down A LOT to keep your sats from dropping below 90. That lower intensity exercise is still valuable, but maybe not as much as the higher intenisity with a little help from oxygen.

What ever you do, I definitely think you should do whatever you can to keep exercising... its such a critical part of optimizing and maintaining lung health.

I don't know what my O2 sats do while I'm exercising, but I do train with heart rate, which I've used as a decent proxy. The increase of 60 beats rule your nurse mentioned is a very rough estimate of where you could expect your anaerobic threshold to be. Given that your resting heart rate is a little high, and you are desating, I would say its not a perfect fit for you.

Chris

26 m w/CF

cdale613 · May 29, 2007

Hi Sonia,

85 is definitely a little low... from what I've read, during aerobic exercise you should absolutely stay above 88, and as Amy mentioned before, a lot of dr.'s recommend staying above 90 or higher.

If you are really opposed to using O2 during your workouts, there are a few different things that might help you:

1) Can you run outside? The air quality will likely be better than your 80 degree recycled air gym, which might help. The scenery will keep changing too, which you might find you enjoy more. If at some point you find you need to use 02, it might be a lot more comfortable to use it outside than in the gym setting. Either way, once you tell one or two people why you're using it, they'll all think you're a champion.

2) Warm up SLOWLY. If you increase the amount of time you take to go from resting to walking, to walking faster, to running, your body will do a better job at keeping up with your oxygen needs, and may not drop as much when you start running.

3) Its possible, even likely, that you may have to slow down A LOT to keep your sats from dropping below 90. That lower intensity exercise is still valuable, but maybe not as much as the higher intenisity with a little help from oxygen.

What ever you do, I definitely think you should do whatever you can to keep exercising... its such a critical part of optimizing and maintaining lung health.

I don't know what my O2 sats do while I'm exercising, but I do train with heart rate, which I've used as a decent proxy. The increase of 60 beats rule your nurse mentioned is a very rough estimate of where you could expect your anaerobic threshold to be. Given that your resting heart rate is a little high, and you are desating, I would say its not a perfect fit for you.

Chris

26 m w/CF

ladybug · May 29, 2007

<div class="FTQUOTE"><begin quote>Originally posted by: cdale613

85 is definitely a little low... from what I've read, during aerobic exercise you should absolutely stay above 88, and as Amy mentioned before, a lot of dr.'s recommend staying above 90 or higher.

Can you please link me to such studies? I spent over an hour looking for any atricles about studying what your O2 sats should be DURING exercise and couldn't find anything online. I would LOVE to read about this.

If you are really opposed to using O2 during your workouts, there are a few different things that might help you:

1) Can you run outside? The air quality will likely be better than your 80 degree recycled air gym, which might help. The scenery will keep changing too, which you might find you enjoy more. If at some point you find you need to use 02, it might be a lot more comfortable to use it outside than in the gym setting. Either way, once you tell one or two people why you're using it, they'll all think you're a champion.

Well, I live in Vegas, so unfortunately we only have about 2-3 months that are appropriate running weather. <img src="i/expressions/face-icon-small-sad.gif" border="0"> Not only that, but we have blowing dust here nearly every single day and bad air quality days at least 2-4 times a week. Its gotten very very bad. <img src="i/expressions/face-icon-small-sad.gif" border="0">

2) Warm up SLOWLY. If you increase the amount of time you take to go from resting to walking, to walking faster, to running, your body will do a better job at keeping up with your oxygen needs, and may not drop as much when you start running.

I currently warm up with a walk for 5 minutes at 0.0 incline and then run and then run uphill for 15 minutes or so and then walk for another 5-8 minutes at 0.0 incline for a cool down. I could maybe use a longer warm up? What SHOULD a warm up be? I walk slow and increase my speed during those 5 minutes.

3) Its possible, even likely, that you may have to slow down A LOT to keep your sats from dropping below 90. That lower intensity exercise is still valuable, but maybe not as much as the higher intenisity with a little help from oxygen.

Yes, this is what I will have to consider. I don't want to inhibit myself just cause I don't want to wear O2. 

What ever you do, I definitely think you should do whatever you can to keep exercising... its such a critical part of optimizing and maintaining lung health.

I totally agree! I LOVE it!

I don't know what my O2 sats do while I'm exercising, but I do train with heart rate, which I've used as a decent proxy. The increase of 60 beats rule your nurse mentioned is a very rough estimate of where you could expect your anaerobic threshold to be. Given that your resting heart rate is a little high, and you are desating, I would say its not a perfect fit for you.

Hmm... well, I'd heard the 60-75 beats rule before in gym classes and stuff too, and thought its a general rule of thumb, I think its more accurate than the 220-age is max HR that everyone talks about. It makes more sense on a personal level. I totally agree though that you need to look at the BIG picture and not just HR when determining a good level of exercise, so I will have this checked into. 

I guess I trust what the medical professionals say they do in their hospitals and clinics, though as has been said, I may want to consult a professional EXERCISE physiologist instead of a nurse or doctors even. My docs didn't seem worried and kind of sluffed off my question about my HR getting to 180 before, so they didn't seem worried and never even mentioned checking my O2 sats (I just did that because people on here suggested it! LOL).... So, not too sure how accurate a CF doc's advise on exercise would be either. You go to a specialist for your lungs, so why not go to a specialist for exercise, right? I will maybe look into an exercise test of some sort here in Vegas, as my CF clinic is in Salt Lake and its about 2500 miles higher than what I'm used to, so when I go for my appts., just sitting in the room the day I get there I desat. LOL!

Thanks for all the advice and info, everyone!!! I really really appreciate everyone's kind words and thoughts on this. As always, this site is very helpful and supportive!

GOOD FOR ALL OF US WHO GET OUT AND EXERCISE!!!

ladybug · May 29, 2007

<div class="FTQUOTE"><begin quote>Originally posted by: cdale613

85 is definitely a little low... from what I've read, during aerobic exercise you should absolutely stay above 88, and as Amy mentioned before, a lot of dr.'s recommend staying above 90 or higher.

Can you please link me to such studies? I spent over an hour looking for any atricles about studying what your O2 sats should be DURING exercise and couldn't find anything online. I would LOVE to read about this.

If you are really opposed to using O2 during your workouts, there are a few different things that might help you:

1) Can you run outside? The air quality will likely be better than your 80 degree recycled air gym, which might help. The scenery will keep changing too, which you might find you enjoy more. If at some point you find you need to use 02, it might be a lot more comfortable to use it outside than in the gym setting. Either way, once you tell one or two people why you're using it, they'll all think you're a champion.

Well, I live in Vegas, so unfortunately we only have about 2-3 months that are appropriate running weather. <img src="i/expressions/face-icon-small-sad.gif" border="0"> Not only that, but we have blowing dust here nearly every single day and bad air quality days at least 2-4 times a week. Its gotten very very bad. <img src="i/expressions/face-icon-small-sad.gif" border="0">

2) Warm up SLOWLY. If you increase the amount of time you take to go from resting to walking, to walking faster, to running, your body will do a better job at keeping up with your oxygen needs, and may not drop as much when you start running.

I currently warm up with a walk for 5 minutes at 0.0 incline and then run and then run uphill for 15 minutes or so and then walk for another 5-8 minutes at 0.0 incline for a cool down. I could maybe use a longer warm up? What SHOULD a warm up be? I walk slow and increase my speed during those 5 minutes.

3) Its possible, even likely, that you may have to slow down A LOT to keep your sats from dropping below 90. That lower intensity exercise is still valuable, but maybe not as much as the higher intenisity with a little help from oxygen.

Yes, this is what I will have to consider. I don't want to inhibit myself just cause I don't want to wear O2. 

What ever you do, I definitely think you should do whatever you can to keep exercising... its such a critical part of optimizing and maintaining lung health.

I totally agree! I LOVE it!

I don't know what my O2 sats do while I'm exercising, but I do train with heart rate, which I've used as a decent proxy. The increase of 60 beats rule your nurse mentioned is a very rough estimate of where you could expect your anaerobic threshold to be. Given that your resting heart rate is a little high, and you are desating, I would say its not a perfect fit for you.

Hmm... well, I'd heard the 60-75 beats rule before in gym classes and stuff too, and thought its a general rule of thumb, I think its more accurate than the 220-age is max HR that everyone talks about. It makes more sense on a personal level. I totally agree though that you need to look at the BIG picture and not just HR when determining a good level of exercise, so I will have this checked into. 

I guess I trust what the medical professionals say they do in their hospitals and clinics, though as has been said, I may want to consult a professional EXERCISE physiologist instead of a nurse or doctors even. My docs didn't seem worried and kind of sluffed off my question about my HR getting to 180 before, so they didn't seem worried and never even mentioned checking my O2 sats (I just did that because people on here suggested it! LOL).... So, not too sure how accurate a CF doc's advise on exercise would be either. You go to a specialist for your lungs, so why not go to a specialist for exercise, right? I will maybe look into an exercise test of some sort here in Vegas, as my CF clinic is in Salt Lake and its about 2500 miles higher than what I'm used to, so when I go for my appts., just sitting in the room the day I get there I desat. LOL!

Thanks for all the advice and info, everyone!!! I really really appreciate everyone's kind words and thoughts on this. As always, this site is very helpful and supportive!

GOOD FOR ALL OF US WHO GET OUT AND EXERCISE!!!

ladybug · May 29, 2007

<div class="FTQUOTE"><begin quote>Originally posted by: cdale613

85 is definitely a little low... from what I've read, during aerobic exercise you should absolutely stay above 88, and as Amy mentioned before, a lot of dr.'s recommend staying above 90 or higher.

Can you please link me to such studies? I spent over an hour looking for any atricles about studying what your O2 sats should be DURING exercise and couldn't find anything online. I would LOVE to read about this.

If you are really opposed to using O2 during your workouts, there are a few different things that might help you:

1) Can you run outside? The air quality will likely be better than your 80 degree recycled air gym, which might help. The scenery will keep changing too, which you might find you enjoy more. If at some point you find you need to use 02, it might be a lot more comfortable to use it outside than in the gym setting. Either way, once you tell one or two people why you're using it, they'll all think you're a champion.

Well, I live in Vegas, so unfortunately we only have about 2-3 months that are appropriate running weather. <img src="i/expressions/face-icon-small-sad.gif" border="0"> Not only that, but we have blowing dust here nearly every single day and bad air quality days at least 2-4 times a week. Its gotten very very bad. <img src="i/expressions/face-icon-small-sad.gif" border="0">

2) Warm up SLOWLY. If you increase the amount of time you take to go from resting to walking, to walking faster, to running, your body will do a better job at keeping up with your oxygen needs, and may not drop as much when you start running.

I currently warm up with a walk for 5 minutes at 0.0 incline and then run and then run uphill for 15 minutes or so and then walk for another 5-8 minutes at 0.0 incline for a cool down. I could maybe use a longer warm up? What SHOULD a warm up be? I walk slow and increase my speed during those 5 minutes.

3) Its possible, even likely, that you may have to slow down A LOT to keep your sats from dropping below 90. That lower intensity exercise is still valuable, but maybe not as much as the higher intenisity with a little help from oxygen.

Yes, this is what I will have to consider. I don't want to inhibit myself just cause I don't want to wear O2. 

What ever you do, I definitely think you should do whatever you can to keep exercising... its such a critical part of optimizing and maintaining lung health.

I totally agree! I LOVE it!

I don't know what my O2 sats do while I'm exercising, but I do train with heart rate, which I've used as a decent proxy. The increase of 60 beats rule your nurse mentioned is a very rough estimate of where you could expect your anaerobic threshold to be. Given that your resting heart rate is a little high, and you are desating, I would say its not a perfect fit for you.

Hmm... well, I'd heard the 60-75 beats rule before in gym classes and stuff too, and thought its a general rule of thumb, I think its more accurate than the 220-age is max HR that everyone talks about. It makes more sense on a personal level. I totally agree though that you need to look at the BIG picture and not just HR when determining a good level of exercise, so I will have this checked into. 

I guess I trust what the medical professionals say they do in their hospitals and clinics, though as has been said, I may want to consult a professional EXERCISE physiologist instead of a nurse or doctors even. My docs didn't seem worried and kind of sluffed off my question about my HR getting to 180 before, so they didn't seem worried and never even mentioned checking my O2 sats (I just did that because people on here suggested it! LOL).... So, not too sure how accurate a CF doc's advise on exercise would be either. You go to a specialist for your lungs, so why not go to a specialist for exercise, right? I will maybe look into an exercise test of some sort here in Vegas, as my CF clinic is in Salt Lake and its about 2500 miles higher than what I'm used to, so when I go for my appts., just sitting in the room the day I get there I desat. LOL!

Thanks for all the advice and info, everyone!!! I really really appreciate everyone's kind words and thoughts on this. As always, this site is very helpful and supportive!

GOOD FOR ALL OF US WHO GET OUT AND EXERCISE!!!

Chaggie · May 29, 2007

This isn't a study, but it is published.

<a target=_blank class=ftalternatingbarlinklarge href="http://www.bcbst.com/MPManual/Oxygen_and_Oxygen_Supplies.htm">http://www.bcbst.com/MPManual/...nd_Oxygen_Supplies.htm</a>

Chaggie · May 29, 2007

This isn't a study, but it is published.

<a target=_blank class=ftalternatingbarlinklarge href="http://www.bcbst.com/MPManual/Oxygen_and_Oxygen_Supplies.htm">http://www.bcbst.com/MPManual/...nd_Oxygen_Supplies.htm</a>

Chaggie · May 29, 2007

This isn't a study, but it is published.

<a target=_blank class=ftalternatingbarlinklarge href="http://www.bcbst.com/MPManual/Oxygen_and_Oxygen_Supplies.htm">http://www.bcbst.com/MPManual/...nd_Oxygen_Supplies.htm</a>

ladybug · May 29, 2007

<div class="FTQUOTE"><begin quote>Originally posted by: Chaggie

This isn't a study, but it is published.

<a target=_blank class=ftalternatingbarlinklarge href="http://www.bcbst.com/MPManual/Oxygen_and_Oxygen_Supplies.htm">http://www.bcbst.com/MPManual/...nd_Oxygen_Supplies.htm</a></end quote></div>

Chris,

Thank you! That was great! I'm wondering, however, if they're testing at peak exercise or immediately AFTER as the hospital the nurse I spoke to does?? If they do it immediately AFTER exercise and you're still under 90%, that is what the nurse said is bad too and would coincide with this information. Are there any studies that you know of that show WHEN to test?? The nurse had said that exercise O2 is taken immediately upon stopping the exercise. This article just says "with exercise", not during. Just curious. We may be saying the same thing?

ladybug · May 29, 2007

<div class="FTQUOTE"><begin quote>Originally posted by: Chaggie

This isn't a study, but it is published.

<a target=_blank class=ftalternatingbarlinklarge href="http://www.bcbst.com/MPManual/Oxygen_and_Oxygen_Supplies.htm">http://www.bcbst.com/MPManual/...nd_Oxygen_Supplies.htm</a></end quote></div>

Chris,

Thank you! That was great! I'm wondering, however, if they're testing at peak exercise or immediately AFTER as the hospital the nurse I spoke to does?? If they do it immediately AFTER exercise and you're still under 90%, that is what the nurse said is bad too and would coincide with this information. Are there any studies that you know of that show WHEN to test?? The nurse had said that exercise O2 is taken immediately upon stopping the exercise. This article just says "with exercise", not during. Just curious. We may be saying the same thing?

ladybug · May 29, 2007

<div class="FTQUOTE"><begin quote>Originally posted by: Chaggie

This isn't a study, but it is published.

<a target=_blank class=ftalternatingbarlinklarge href="http://www.bcbst.com/MPManual/Oxygen_and_Oxygen_Supplies.htm">http://www.bcbst.com/MPManual/...nd_Oxygen_Supplies.htm</a></end quote></div>

Chris,

Thank you! That was great! I'm wondering, however, if they're testing at peak exercise or immediately AFTER as the hospital the nurse I spoke to does?? If they do it immediately AFTER exercise and you're still under 90%, that is what the nurse said is bad too and would coincide with this information. Are there any studies that you know of that show WHEN to test?? The nurse had said that exercise O2 is taken immediately upon stopping the exercise. This article just says "with exercise", not during. Just curious. We may be saying the same thing?

LisaV · May 29, 2007

OK I'm going to stick my neck out here and be a bit flat footed. (Did it with my late husband and took his guff, so you guys are amateurs.)

I think you're rationalizing away your need for oxygen during exercise.
Medicare would pay for you to have oxygen according to their guidelines (see <a target=_blank class=ftalternatingbarlinklarge href="http://www.tricenturion.com/content/Doc_View.cfm?type=LCDCurr&File=lcd+for+oxygen+and+oxygen+equipment+1206.htm">http://www.tricenturion.com/co...gen+equipment+1206.htm</a> ).
"An arterial PO 2 at or below 55 mm Hg or an arterial oxygen saturation at or below 88 percent, taken during exercise for a patient who demonstrates an arterial PO 2 at or above 56 mm Hg or an arterial oxygen saturation at or above 89 percent during the day while at rest. In this case, oxygen is provided for during exercise if it is documented that the use of oxygen improves the hypoxemia that was demonstrated during exercise when the patient was breathing room air."

And let me tell you Medicare is cheap cheap cheap. (Lots of docs would like to see people on O2 once sats drop below 90.)
IMHO (and experience) It is more important to stay as strong as you can (exercise as hard as you can) than it is to stay off of oxygen.
Being desated like you are now is just damaging your heart.

Your plan of just exercising less (and less and less and less?) in order to stay off of oxygen is counterproductive to being in the best shape you can be.

LisaV · May 29, 2007

OK I'm going to stick my neck out here and be a bit flat footed. (Did it with my late husband and took his guff, so you guys are amateurs.)

I think you're rationalizing away your need for oxygen during exercise.
Medicare would pay for you to have oxygen according to their guidelines (see <a target=_blank class=ftalternatingbarlinklarge href="http://www.tricenturion.com/content/Doc_View.cfm?type=LCDCurr&File=lcd+for+oxygen+and+oxygen+equipment+1206.htm">http://www.tricenturion.com/co...gen+equipment+1206.htm</a> ).
"An arterial PO 2 at or below 55 mm Hg or an arterial oxygen saturation at or below 88 percent, taken during exercise for a patient who demonstrates an arterial PO 2 at or above 56 mm Hg or an arterial oxygen saturation at or above 89 percent during the day while at rest. In this case, oxygen is provided for during exercise if it is documented that the use of oxygen improves the hypoxemia that was demonstrated during exercise when the patient was breathing room air."

And let me tell you Medicare is cheap cheap cheap. (Lots of docs would like to see people on O2 once sats drop below 90.)
IMHO (and experience) It is more important to stay as strong as you can (exercise as hard as you can) than it is to stay off of oxygen.
Being desated like you are now is just damaging your heart.

Your plan of just exercising less (and less and less and less?) in order to stay off of oxygen is counterproductive to being in the best shape you can be.

Resting vs. Max heart rate

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