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how do you know how fast/slow your metabolism is?(11 posts)

how do you know how fast/slow your metabolism is?ColnagoFE
Jan 15, 2003 1:52 PM
NBot specifically cycling related, but...I read somewhere that there is soon to be a simple test to determine one's daily caloric requirement. How is this determined now? I mean how do you find out that to maintain your current weight you need to eat "x" calories/day. Assuming you knew that, how big of a percentage of those calories do you need to elimiate to safely lose weight?
re: how do you know how fast/slow your metabolism is?MJCBH
Jan 15, 2003 2:47 PM
There's a new system out called the Body Gem. I haven't used it,but I've heard it's pretty good for measuring your Basal Metabolic Rate. I know Health South clinics do them, and probably a lot of other Sports Med. clinics. The test costs around $50 (which is why I haven't done it yet!). Good luck to ya!
re: how do you know how fast/slow your metabolism is?Tarball
Jan 15, 2003 2:51 PM
I just did the test last week. I took it at a physical therapist's office. It's simple. You breathe through a gadget that looks kind a respirator for about 10 minutes. It takes a reading. The therapist asks you a few questions about your lifestyle (what you do for work, how often & intense you ride, etc.). Then they compare your numbers with a chart & tell you how many calories you need a day.
These tests are not very accurateKerry
Jan 15, 2003 4:43 PM
Doing a breath analysis and asking a few questions about your habits may give you a caloric requirement that is within 10% of your actual number. IOW, within 300 or so calories per day. Well, 300 calories per day means a difference of 1 lb. of weight gain/loss every 2 weeks or so. Then again, most people can't count their calories that close either. So, if you want to lose weight, this won't help all that much. If you want to lose weight, you have to be a little hungry all the time, and go to bed hungry. Simple as that.
re:I thought basal metabolisms don't vary much.dzrider
Jan 16, 2003 5:31 AM
The differences most people assign to metabolism often result from other variables. Resting metabolisms are much the same and differences in calories burned come more from activity levels during the day. Given the same tasks, thin people, as group, accomplish them with much more movement than heavier people. The thin are more likely to fidget, wave their arms playing basketball, stand up to let somebody get to their seat in the theater, etc. An analysis of films made in fast food restaurants showed that how much people moved was a better predictor of their weight than the amount of food on their trays.
Jan 16, 2003 5:31 AM
re:I thought basal metabolisms don't vary much.
500 calories to lose weight...timfire
Jan 15, 2003 4:59 PM
I've heard it recommended that you shouldn't cut your calories by more than 500 calories a day. (Actually, I heard you should increase your calorie expendature(sp?) by around 200, and then decrease your intake by 300, for a net lose of 500.) I think that'll give you about a lose of 1.5lbs per week, but I can't remember right now.

I also heard that for a "normal" person with a "moderate" activity level, you need (I think) 15 calories per pound of body weight per day to *maintain* your current weight. I know that's not very scientific, but I think that's a good starting point.

--Tim Kleinert
Close, but off by 50%Kerry
Jan 15, 2003 5:45 PM
If you burn 500 calories more per day than you consume, you'll lose 1 lb. per week of fat (3500 calories per lb.). The fastest you should lose weight is generally accepted as 2 lb. per week = 1000 calorie per day deficit. If you are trying to perform athletically, that 1000 calorie deficit will likely leave you feeling dragged out, so the 500 number is a good daily figure to both lose weight and maintain your performance.
re: how do you know how fast/slow your metabolism is?zeke
Jan 16, 2003 4:14 AM
BMR (Basal Metabolic Rate) is strongly correlated with body temperature. Take your temp 3 or 4 times a day, and if it is consistently BELOW 98.6, the your BMR is lower than normal, if it is consistently HIGHER than 98.6, the converse. This is at least a start.
Calorie requirement calculationsPEDDLEFOOT
Jan 16, 2003 6:31 AM
Find your weight in Kilograms by multiplying Lbs. by .45
Take this number and multiply it by 24kcal/day.This will be your Resting Metobolic Rate (RMR) or how many calories it takes for your body to live on without any physical activity.

You then multiply RMR by .5 if you have heavy activity such as working out or riding 5-7 days a week.
Multiply RMR by .4 for moderate activity 4-5 days a week.
Multiply RMR by .3 for light activity 3 days or less.

Take that number and add it to your RMR .This is the amount of calories your body needs to maintain current weight at your activity level.

To lose 1 pound of weight you need to have a caloric deficit of 3500 calories by either increasing your activity level or decreasing your caloric intake or a combination of both.To lose 1 pound a week you only need to have a 500 calorie deficit a day.


I weigh 130 lbs. 130 x.45=58.5 Kgs.

58.5 x 24 = 1404 calories .This is RMR.

My activity level is high so I would multiply RMR by .5

1404 x .5 = 702

now add 1404(RMR) + 702 = 2106 calories.

This is the number of calories it takes for me to maintain my current weight of 130 lbs.

Hope this helps.
Again, these are approximations (nm)Kerry
Jan 16, 2003 5:04 PM