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  1. #1
    Registered User meeee's Avatar
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    how much does caffeine affect how many calories you burn a day?

    and will it waste muscle??
    "Go hard or go home"
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  2. #2
    Registered User masterjb's Avatar
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    I've read in can increase metabolism by maybe 1-2%, and 2-3% when stacked with ephedrine. It will not waste muscle, only a lacking diet/training will do that. Caffeine only enhances whatever you are already doing
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  3. #3
    Rep Power: 696969 batmanman's Avatar
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    i think it increases it more than 1-2%... i was on caffeine pills for a semester of high school once and i lost weight like crazy and i had to eat all the time
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  4. #4
    Jack3d Fan Teledin's Avatar
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    thermogenics are pumped full of different caffeine extracts or whatever you want to call them. They work nicely, so I would say it plays a role ... maybe not a major role but definitely not a minor one at that.
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    Registered User meeee's Avatar
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    sorry i forgot to mention per 100mg
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  6. #6
    Jack3d Fan Teledin's Avatar
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    Originally Posted by meeee View Post
    sorry i forgot to mention per 100mg
    per 100mg? very little ... but i think that it will depend on the type of caffeine thats used.

    dont go doing 1000mg either .... some crazy stuff
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  7. #7
    Registered User Precision14's Avatar
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    this explains y i am bulking but losing fat, i have 2.5 cups of cofee every morning
    "Moderation in discipline is failure"

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  8. #8
    B.S. Kinesiology CSCS Vipersg123's Avatar
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    caffeine doesn't really increase your caloric expenditure... it simply increases fat oxidation.
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    Originally Posted by Teledin View Post
    per 100mg? very little ... but i think that it will depend on the type of caffeine thats used.

    dont go doing 1000mg either .... some crazy stuff
    i have a high tolerance but i doubt id need to go past 400 or so ever.
    "Go hard or go home"
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  10. #10
    Rep Power: 696969 batmanman's Avatar
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    Originally Posted by Vipersg123 View Post
    caffeine doesn't really increase your caloric expenditure... it simply increases fat oxidation.
    what does fat oxidation mean?
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  11. #11
    B.S. Kinesiology CSCS Vipersg123's Avatar
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    Originally Posted by zachman08 View Post
    what does fat oxidation mean?
    more fat oxidized for energy. Endurance athletes love caffeine because if you increase fat oxidation then you must decrease carbohydrate use and that will spare glycogen stores and allow that endurance athlete to perform longer.
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  12. #12
    Registered User masterjb's Avatar
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    Originally Posted by Vipersg123 View Post
    caffeine doesn't really increase your caloric expenditure... it simply increases fat oxidation.
    I believe it does... Wouldn't it make sense as the increase heart rate results in increases in calories burned? This is one of the pathways as to how it might work (not sure though), but definitely true on the fat oxidation.
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  13. #13
    Bodybuilding.com crunchfit's Avatar
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    Originally Posted by Vipersg123 View Post
    caffeine doesn't really increase your caloric expenditure... it simply increases fat oxidation.
    I don't think so.

    http://ajpendo.physiology.org/cgi/co...ct/268/6/E1192

    http://pt.wkhealth.com/pt/re/bjon/ab...195629!8091!-1
    Last edited by crunchfit; 12-08-2008 at 05:10 PM.
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  14. #14
    B.S. Kinesiology CSCS Vipersg123's Avatar
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    any increase in caloric expenditure from caffeine is USUALLY not significant enough to take it into account. Crunch, you bolded the "increases fat oxidation"... whys that? edit: 1 sec reading studies.
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  15. #15
    Bodybuilding.com crunchfit's Avatar
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    I just happened to be reading those two studies last week and the fat oxidation + energy expenditure thing was stuck in my head.
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  16. #16
    B.S. Kinesiology CSCS Vipersg123's Avatar
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    k then here's some studies saying otherwise


    http://www.ajcn.org/cgi/content/abstract/33/5/989

    another study:

    Influence of caffeine and carbohydrate feedings on endurance performance.

    Ivy JL, Costill DL, Fink WJ, Lower RW.

    Nine trained cyclists were studied to determine the effects of caffeine (CAF), and glucose polymer (GP) feedings on work production (kpm) during two hr of isokinetic cycling exercise (80 rpm). Ingestion of 250 mg of CAF 60 min prior to the ride was followed by ingestion of an additional 250 mg fed at 15 min intervals over the first 90 min of the exercise. This treatment significantly increased work production by 7.4% and Vo2 by 7.3% as compared to control (C) while the subjects' perception of exertion remained unchanged. Ingestion of approximately 90 g of GP during the first 90 min (12.8 g/15 min) of the exercise had no effect on total work production or Vo2. It was, however, effective in reducing the rate of fatigue over the last 30 min of cycling. Although GP maintained blood glucose and insulin levels (P less than or equal to 0.05) above those of the C and CAF trials, total CHO utilization did not differ between treatments. During the last 70 min of the CAF trial, however, fat oxidation was elevated 31% and appeared to provide the substrate needed for the increased work production during this period of exercise. These data, therefore, demonstrate an enhanced rate of lipid catabolism and work production following the ingestion of caffeine.

    another possible reasonable study:

    Effects of caffeine on the metabolic and catecholamine responses to exercise in 5 and 28 degrees C.

    Anderson DE, Hickey MS.

    Human Performance Laboratory, Ball State University, Muncie, IN 47306.

    The influence of caffeine on the metabolic and catecholamine responses to mild exercise in a cold and a warm environment was studied in eight healthy males. The subjects performed 60 min of cycling at 50% VO2max in a cold environment (5 degrees C and 70% relative humidity) and a warm environment (28 degrees C and 50% relative humidity) 30 min after ingesting caffeine (5 mg.kg-1 body weight) or placebo (dextrose). Caffeine ingestion prior to exercise in the warm environment resulted in increased plasma epinephrine, with no effect on plasma norepinephrine. Neither lipid nor carbohydrate metabolism was altered by caffeine in the warm trial. Exercise in the cold environment (placebo) produced increased VO2 and carbohydrate metabolism, decreased lipid metabolism, and no difference in plasma catecholamines compared with the warm-placebo trial. Responses to the combination of caffeine ingestion and the cold environment did not differ from cold-placebo responses in VO2 during the cycling bout. However, in the cold-caffeine trial plasma epinephrine was elevated. In addition, fat oxidation and serum free fatty acids were elevated in the cold-caffeine condition. Carbohydrate oxidation was depressed, while serum glucose and blood lactate were elevated in this trial compared to cold-placebo. Thus, caffeine increases plasma epinephrine; cold increases oxygen consumption and carbohydrate metabolism, while decreasing lipid metabolism; and the combination of caffeine and cold during exercise increases plasma epinephrine and lipid metabolism, but decreases carbohydrate metabolism.

    -----------------------------

    This is an on going debate whether it happens or not. Personally it was what I was taught, but I am open to new ideas as there are plenty of studies for either side of the argument.
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  17. #17
    Bodybuilding.com crunchfit's Avatar
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    Originally Posted by Vipersg123 View Post
    Nine trained cyclists were studied to determine the effects of caffeine (CAF), and glucose polymer (GP) feedings on work production (kpm) during two hr of isokinetic cycling exercise (80 rpm). Ingestion of 250 mg of CAF 60 min prior to the ride was followed by ingestion of an additional 250 mg fed at 15 min intervals over the first 90 min of the exercise. This treatment significantly increased work production by 7.4% and Vo2 by 7.3% as compared to control (C) while the subjects' perception of exertion remained unchanged. Ingestion of approximately 90 g of GP during the first 90 min (12.8 g/15 min) of the exercise had no effect on total work production or Vo2. It was, however, effective in reducing the rate of fatigue over the last 30 min of cycling. Although GP maintained blood glucose and insulin levels (P less than or equal to 0.05) above those of the C and CAF trials, total CHO utilization did not differ between treatments. During the last 70 min of the CAF trial, however, fat oxidation was elevated 31% and appeared to provide the substrate needed for the increased work production during this period of exercise. These data, therefore, demonstrate an enhanced rate of lipid catabolism and work production following the ingestion of caffeine.
    Might the glucose polymer have had an effect?

    Jeffrey F. Horowitz, Ricardo Mora-Rodriguez, Lauri O. Byerley, and Edward F. Coyle

    The Human Performance Laboratory, Department of Kinesiology and Health Education and Division of Nutritional Sciences, The University of Texas at Austin, Austin, Texas 78712

    This study determined if the suppression of lipolysis after preexercise carbohydrate ingestion reduces fat oxidation during exercise. Six healthy, active men cycled 60 min at 44 ? 2% peak oxygen consumption, exactly 1 h after ingesting 0.8 g/kg of glucose (Glc) or fructose (Fru) or after an overnight fast (Fast). The mean plasma insulin concentration during the 50 min before exercise was different among Fast, Fru, and Glc (8 ? 1, 17 ? 1, and 38 ? 5 ?U/ml, respectively; P < 0.05). After 25 min of exercise, whole body lipolysis was 6.9 ? 0.2, 4.3 ? 0.3, and 3.2 ? 0.5 ?mol ? kg-1 ? min-1 and fat oxidation was 6.1 ? 0.2, 4.2 ? 0.5, and 3.1 ? 0.3 ?mol ? kg-1 ? min-1 during Fast, Fru, and Glc, respectively (all P < 0.05). During Fast, fat oxidation was less than lipolysis (P < 0.05), whereas fat oxidation approximately equaled lipolysis during Fru and Glc. In an additional trial, the same subjects ingested glucose (0.8 g/kg) 1 h before exercise and lipolysis was simultaneously increased by infusing Intralipid and heparin throughout the resting and exercise periods (Glc+Lipid). This elevation of lipolysis during Glc+Lipid increased fat oxidation 30% above Glc (4.0 ? 0.4 vs. 3.1 ? 0.3 ?mol ? kg-1 ? min-1; P < 0.05), confirming that lipolysis limited fat oxidation. In summary, small elevations in plasma insulin before exercise suppressed lipolysis during exercise to the point at which it equaled and appeared to limit fat oxidation.
    Last edited by crunchfit; 12-08-2008 at 05:47 PM.
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    Originally Posted by crunchfit View Post
    Might the glucose polymer have had an effect?

    Jeffrey F. Horowitz, Ricardo Mora-Rodriguez, Lauri O. Byerley, and Edward F. Coyle

    The Human Performance Laboratory, Department of Kinesiology and Health Education and Division of Nutritional Sciences, The University of Texas at Austin, Austin, Texas 78712

    This study determined if the suppression of lipolysis after preexercise carbohydrate ingestion reduces fat oxidation during exercise. Six healthy, active men cycled 60 min at 44 ? 2% peak oxygen consumption, exactly 1 h after ingesting 0.8 g/kg of glucose (Glc) or fructose (Fru) or after an overnight fast (Fast). The mean plasma insulin concentration during the 50 min before exercise was different among Fast, Fru, and Glc (8 ? 1, 17 ? 1, and 38 ? 5 ?U/ml, respectively; P < 0.05). After 25 min of exercise, whole body lipolysis was 6.9 ? 0.2, 4.3 ? 0.3, and 3.2 ? 0.5 ?mol ? kg-1 ? min-1 and fat oxidation was 6.1 ? 0.2, 4.2 ? 0.5, and 3.1 ? 0.3 ?mol ? kg-1 ? min-1 during Fast, Fru, and Glc, respectively (all P < 0.05). During Fast, fat oxidation was less than lipolysis (P < 0.05), whereas fat oxidation approximately equaled lipolysis during Fru and Glc. In an additional trial, the same subjects ingested glucose (0.8 g/kg) 1 h before exercise and lipolysis was simultaneously increased by infusing Intralipid and heparin throughout the resting and exercise periods (Glc+Lipid). This elevation of lipolysis during Glc+Lipid increased fat oxidation 30% above Glc (4.0 ? 0.4 vs. 3.1 ? 0.3 ?mol ? kg-1 ? min-1; P < 0.05), confirming that lipolysis limited fat oxidation. In summary, small elevations in plasma insulin before exercise suppressed lipolysis during exercise to the point at which it equaled and appeared to limit fat oxidation.
    ohhhh the day i get my degree in nutrition and exercise science
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    Originally Posted by Precision14 View Post
    this explains y i am bulking but losing fat, i have 2.5 cups of cofee every morning
    How do you drink your coffee? I drink around 1 cup a day, with a little bit of creamer and sugar.
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  20. #20
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    Um..No dude your wrong..

    "I don't think so."


    IN reply to crunchfit:


    Your 2 journal entries do not sufficiently answer the question posed. One is a comparison between young and old males of the effects of caffeine. The other is a comparison between two different types of caffeine sources. In both journal entries the end result is a comparison of two different groups or sources and does not answer the question posed. Though, obviously if they are comparing the two, there must be enough of a result to measure in the first place. So, the answer would be YES!
    Last edited by gsokol1026; 06-22-2011 at 03:19 PM. Reason: mispelled
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