Advertise on Bikeforums.net



User Tag List

Results 1 to 15 of 15
  1. #1
    Member
    Join Date
    Sep 2007
    Location
    Missoula. MT
    My Bikes
    1998 Cannondale F1000
    Posts
    38
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)

    Something interesting from my biochem class

    According to my biochemistry professor the average 70 kg male has 420,000 kilojoules in energy reserves stored as fat. I am a little over 100 kg (and probably more stout than a "normal" male) so to keep the numbers easy I will say I weigh in at 105 kg which if you multiply 420000*1.5 you get 630,000 kJ. Now, one joule is equal to just over four calories. Seeing as how we're dealing with kilojoules and there are 1000 calories in one Calorie (aka kilocal or what you're used to reading on the nutrition facts) we can easily make that jump that there are just over four kJ in one Calorie. So, if I take 630,000 and divide by 4.184 I end up with 150,574 Calories of fuel reserves of just fat (fat is by far the largest reserve, though). Now, according to my undergrad physiology professor a person needs 100 Calories to run/walk/travel by foot for one mile. So, do I have 1,500 miles in me? Obviously not as a lot of this energy will be used for several other metabolic functions but it is interesting to think about.

    In case you're curious about the rest of the stats for a 70 kg male-
    170 kJ in glucose
    2500 kJ in glycogen
    100,000 kJ in protein (mostly from muscle)
    Last edited by kchunks; 10-22-07 at 02:00 PM. Reason: typo

  2. #2
    Anarchy by Bike icebike's Avatar
    Join Date
    Oct 2007
    Location
    Edmonton....Burrrrrrrrr
    My Bikes
    2006 Norco Mountaineer
    Posts
    41
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Quote Originally Posted by kchunks View Post
    According to my biochemistry professor the average 70 kg male has 420,000 kilojoules in energy reserves stored as fat. I am a little over 100 kg (and probably more stout than a "normal" male) so to keep the numbers easy I will say I weigh in at 105 kg which if you multiply 420000*1.5 you get 630,000 kJ. Now, one joule is equal to just over four calories. Seeing as how we're dealing with kilojoules and there are 1000 calories in one Calorie (aka kilocal or what you're used to reading on the nutrition facts) we can easily make that jump that there are just over four kJ in one Calorie. So, if I take 630,000 and divide by 4.184 I end up with 150,574 Calories of fuel reserves of just fat (fat is by far the largest reserve, though). Now, according to my undergrad physiology professor a person needs 100 Calories to run/walk/travel by foot for one mile. So, do I have 15,000 miles in me? Obviously not as a lot of this energy will be used for several other metabolic functions but it is interesting to think about.

    In case you're curious about the rest of the stats for a 70 kg male-
    170 kJ in glucose
    2500 kJ in glycogen
    100,000 kJ in protein (mostly from muscle)
    Umm are you sure you don't mean 1,500 miles?
    Anyway, all of those calcs are approximate, since an increase in mass will cause an increase in Calories burned per mile. Nonetheless interesting calc. I'm glad you posted it.
    2006 Norco Mountaineer - Rigged as commuter
    Old Infinity Gravity - Bar/Coffee bike

  3. #3
    Member
    Join Date
    Sep 2007
    Location
    Missoula. MT
    My Bikes
    1998 Cannondale F1000
    Posts
    38
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Quote Originally Posted by icebike View Post
    Umm are you sure you don't mean 1,500 miles?
    Oops- That is what I meant. I had to edit for a few spelling errors but forgot to look at the numbers.

    Yes, those are all approximations because everyone is different. People have different percentage makeups and the you get into different diets and all of the little things that make us unique. As a whole, though, I thought it was interesting.

  4. #4
    The Site Administrator: Currently at home recovering from a couple of strokes,please contact my assistnt admins for forum issues Tom Stormcrowe's Avatar
    Join Date
    Mar 2006
    Location
    South Florida
    My Bikes
    Techna Wheelchair and a Sun EZ 3 Recumbent Trike
    Posts
    16,014
    Mentioned
    10 Post(s)
    Tagged
    4 Thread(s)
    Theoretically, you do, but you will collapse long before finishing it if you were to try it with nothing but hydration support. What would happen is you would cannibalize muscle mass before the fat because muscle is a less efficient storage tissue, and you would at the least suffer severe muscular damage from the attempt as well as very likely liver damage due to glycogen depletion and subsequent low blood sugar and potential coma.

    Fat takes little O2 and energy to maintain vs muscle taking very large amounts of energy and O2 n form of ATP and glucose and Glycogen. The Body tries to save the most efficient tissue for the last gasp of survival, and fat is the most efficient storage. You would also suffer significant cognitive impairment due to the fact that the brain can ONLY run on glucose.
    on light duty due to illness; please contact my assistants for forum issues. They are Siu Blue Wind, or CbadRider or the other 3 star folk. I am currently at home recovering from a couple of strokes. I am making good progress, happily.


    . “He who fights with monsters might take care lest he thereby become a monster. And if you gaze for long into an abyss, the abyss gazes also into you.”- Fredrick Nietzsche

    "We can judge the heart of a man by his treatment of animals." - Immanuel Kant

  5. #5
    Slumberjack
    Join Date
    Sep 2007
    Location
    Bryan, TX
    My Bikes
    2007 Specialized Hardrock Sport
    Posts
    14
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    If you allow for a 1600 Calorie nutritional daily need (1600 in and 1600 out) for normal daily activities, take in to effect riding 11 miles per day at an average speen of 11 MPH (this will burn 1300 calories) then you can burn 150,000 "extra" or "stored" calories in 115 days. there are arox. 3500 calories in 1 lb of fat. so in that 115 days you would lose .40 lbs of fat per day or 3 lbs per week. plus or minus a few here and there depending on what you start weight, level of exercise tolerence and endurance, whether is was anaerobic or aerobic exercise, hydration, hemiglobin count, male or female, and the last four digits of your great grandpa's social security number plus or minus 2.
    2007 Specialized Hardrock Sport

  6. #6
    Senior Member rankin116's Avatar
    Join Date
    Jun 2007
    Location
    Troylet
    Posts
    3,737
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Quote Originally Posted by dschorre View Post
    If you allow for a 1600 Calorie nutritional daily need (1600 in and 1600 out) for normal daily activities, take in to effect riding 11 miles per day at an average speen of 11 MPH (this will burn 1300 calories) then you can burn 150,000 "extra" or "stored" calories in 115 days. there are arox. 3500 calories in 1 lb of fat. so in that 115 days you would lose .40 lbs of fat per day or 3 lbs per week. plus or minus a few here and there depending on what you start weight, level of exercise tolerence and endurance, whether is was anaerobic or aerobic exercise, hydration, hemiglobin count, male or female, and the last four digits of your great grandpa's social security number plus or minus 2.
    nice.

  7. #7
    Senior Member TallSteve's Avatar
    Join Date
    Jun 2007
    Location
    Murfreesboro, TN
    My Bikes
    Cannondale Synapse
    Posts
    116
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    hmmm....I have no idea what you guys are talking about.

  8. #8
    Bent Ryder Sandwarrior's Avatar
    Join Date
    Jul 2006
    Location
    Aurora Colorado
    My Bikes
    Bachetta Agio
    Posts
    546
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Not having ever taken a Physiology class, How then do you get the Fat to start burning, if it all comes from your muscle tissue first? I am a bit confused. What is the purpose then, of training and keepng your HR in the "fat Burning" zone.

    I am going to get my second cup of coffee, and maybe I won't be so confused when I get back
    As for me and my house, we will serve the Lord!
    Joshua 24:15

  9. #9
    Senior Member Wogster's Avatar
    Join Date
    Jul 2006
    Location
    Toronto (again) Ontario, Canada
    My Bikes
    Norco Bushpilot (out of commission), Raleigh Delta
    Posts
    6,944
    Mentioned
    2 Post(s)
    Tagged
    0 Thread(s)
    Quote Originally Posted by dschorre View Post
    If you allow for a 1600 Calorie nutritional daily need (1600 in and 1600 out) for normal daily activities, take in to effect riding 11 miles per day at an average speen of 11 MPH (this will burn 1300 calories) then you can burn 150,000 "extra" or "stored" calories in 115 days. there are arox. 3500 calories in 1 lb of fat. so in that 115 days you would lose .40 lbs of fat per day or 3 lbs per week. plus or minus a few here and there depending on what you start weight, level of exercise tolerence and endurance, whether is was anaerobic or aerobic exercise, hydration, hemiglobin count, male or female, and the last four digits of your great grandpa's social security number plus or minus 2.
    My Great Grandpa didn't have a social security number, so what happens to me?????

  10. #10
    Air
    Air is offline
    Destroyer of Wheels Air's Avatar
    Join Date
    May 2006
    Location
    Creating some FA-Qs
    My Bikes
    Nishiki Sport, Downtube IXNS, 1950's MMB3 Russian Folding Bike, MTB
    Posts
    3,558
    Mentioned
    1 Post(s)
    Tagged
    0 Thread(s)
    Quote Originally Posted by Sandwarrior View Post
    [FONT="Comic Sans MS"][SIZE="3"][COLOR="Teal"]Not having ever taken a Physiology class, How then do you get the Fat to start burning
    Stove on medium and the cast iron skillet hot and rarin' to go.

  11. #11
    Senior Member breadbin's Avatar
    Join Date
    Jul 2006
    Location
    West of Ireland
    My Bikes
    Raleigh 531c, Marin Muirwoods, Brodie Romax
    Posts
    601
    Mentioned
    1 Post(s)
    Tagged
    0 Thread(s)
    I remember I worked out that if for some strange reason I was left on a desert island, I would be ok for 85 days! More or less the same thing.
    Odo=432
    Raleigh 531c
    Peugeot PGN-10
    Marin MTB
    Brodie Romax
    Pastey Howler
    http://www.flickr.com/evildiesel

  12. #12
    The Site Administrator: Currently at home recovering from a couple of strokes,please contact my assistnt admins for forum issues Tom Stormcrowe's Avatar
    Join Date
    Mar 2006
    Location
    South Florida
    My Bikes
    Techna Wheelchair and a Sun EZ 3 Recumbent Trike
    Posts
    16,014
    Mentioned
    10 Post(s)
    Tagged
    4 Thread(s)
    Quote Originally Posted by Sandwarrior View Post
    Not having ever taken a Physiology class, How then do you get the Fat to start burning, if it all comes from your muscle tissue first? I am a bit confused. What is the purpose then, of training and keepng your HR in the "fat Burning" zone.

    I am going to get my second cup of coffee, and maybe I won't be so confused when I get back
    By supplementing protein to offset the initial protein burn and support your muscle mass. Your metabolism will switch from sugars to protein to fat and once you hit the fat burn is when you start healthy weight loss.

    That's the problem with crash diets, by the way.....the weight you do lose is water and muscle and keep the fat
    on light duty due to illness; please contact my assistants for forum issues. They are Siu Blue Wind, or CbadRider or the other 3 star folk. I am currently at home recovering from a couple of strokes. I am making good progress, happily.


    . “He who fights with monsters might take care lest he thereby become a monster. And if you gaze for long into an abyss, the abyss gazes also into you.”- Fredrick Nietzsche

    "We can judge the heart of a man by his treatment of animals." - Immanuel Kant

  13. #13
    Member
    Join Date
    Sep 2007
    Location
    Missoula. MT
    My Bikes
    1998 Cannondale F1000
    Posts
    38
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Wogsterca, you will never not be a clyde not that there is anything wrong with that. (I will always be one, too. But my grandfather had a social security number.)

    The simple answer is that when needed your body will first burn carbohydrates and then burn fat when there is not enough carbohydrate to use. It uses fat instead of other things by using hormones to signal what the body should do. Fats are pretty much hydrocarbons. Glucose (and carbohydrates) have just as much oxygen in the molecule as the do carbon. That means that they (carbohydrates) are bulkier but require less from the body to turn it into usable energy. Fats, being long hydrocarbon chains, pack together very nicely and are therefore used for long term storage because a lot of molecules can be packed tightly. Also, my same undergrad professor told us that at a certain age your body will no longer generate more fat cells. However, it will just pack more fat into the cells that are already there.

  14. #14
    Slumberjack
    Join Date
    Sep 2007
    Location
    Bryan, TX
    My Bikes
    2007 Specialized Hardrock Sport
    Posts
    14
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Quote Originally Posted by Wogsterca View Post
    My Great Grandpa didn't have a social security number, so what happens to me?????
    In that case, take your social security, add all the digitis together until you get a single digit.

    ex. 111-12-1234 = 1+1+1+1+2+1+2+3+4 = 16 = 1+6 = 7 +/- 2

    Then you have your grandfater's social security factor
    2007 Specialized Hardrock Sport

  15. #15
    Senior Member Wogster's Avatar
    Join Date
    Jul 2006
    Location
    Toronto (again) Ontario, Canada
    My Bikes
    Norco Bushpilot (out of commission), Raleigh Delta
    Posts
    6,944
    Mentioned
    2 Post(s)
    Tagged
    0 Thread(s)
    Quote Originally Posted by dschorre View Post
    In that case, take your social security, add all the digitis together until you get a single digit.

    ex. 111-12-1234 = 1+1+1+1+2+1+2+3+4 = 16 = 1+6 = 7 +/- 2

    Then you have your grandfater's social security factor
    I'm in Canada, I don't have a social security number either, do have a social insurance number, same formula should work, probably easier to just use the check digit (second from last).... Then again, because SINs are needed so rarely, I can never remember it, I need to replace my SIN card one of these days, it got wrecked in 1986, and I just keep putting off replacing it.

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •